CN202333144U - Antenna device for double-frequency card reader and double-frequency card reader - Google Patents
Antenna device for double-frequency card reader and double-frequency card reader Download PDFInfo
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- CN202333144U CN202333144U CN2011204740312U CN201120474031U CN202333144U CN 202333144 U CN202333144 U CN 202333144U CN 2011204740312 U CN2011204740312 U CN 2011204740312U CN 201120474031 U CN201120474031 U CN 201120474031U CN 202333144 U CN202333144 U CN 202333144U
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Abstract
The utility model relates to the antenna technology, and particularly relates to an antenna device for a double-frequency card reader and the double-frequency card reader, thus double-frequency card reading can be carried out and mutual interferences of signals can not happen. The antenna device comprises a base plate, a first antenna unit and a second antenna unit which are positioned at the same side of the base plate and are separated, wherein the first antenna unit comprises two first antenna radiation sheets, a first antenna electric feeding structure and a first radio frequency base, wherein the two first antenna radiation sheets are separated from the base plate, and are provided with first grounding ends for direct-current grounding; the first antenna electric feeding structure is symmetrically connected between the two first antenna radiation sheets in an equiamplitude in-phase electric feeding mode and is provided with a first antenna electric feeding terminal; the first radio frequency base is connected to the first antenna electric feeding terminal; the second antenna unit comprises a second antenna radiation sheet and a second radio frequency base, wherein the second antenna radiation sheet is arranged between the two first antenna radiation sheets and is separated from the two first antenna radiation sheets with equal distances, is separated from the base plate, and is provided with a second antenna electric feeding terminal and a second grounding terminal for direct-current grounding; and the second radio frequency base is connected to the second antenna electric feeding terminal.
Description
Technical field
The utility model relates to antenna technology, particularly a kind of antenna assembly and double frequency card reader that is used for the double frequency card reader.
Background technology
Microstrip antenna is the antenna that produces through extra conductor thin slice on the medium substrate that the metallic conductor ground plate is arranged; Wherein, Can between conductor sheet and ground plate, produce radio frequency electromagnetic field, radio frequency electromagnetic field is outwards dispersed through around the conductor sheet and the slit between the ground plate.
Usually, therefore the dielectric substrate thickness of microstrip antenna can reduce the volume of wireless communication apparatus greatly much smaller than the wavelength of the resonance frequency of correspondence.The characteristics of these microstrip antennas such as section is low, volume is little, cost is low, processing technology is simple also are the characteristics of the utility model.But microstrip antenna has deformation simultaneously, be prone to invest printed circuit and power circuit forms single element, produces evenly or the advantages such as radiation pattern of multi-beam, but also have frequency band narrow, reduce shortcomings such as radiation frequency, power are little because of dielectric loss.Therefore, at present miniaturization, broadband, high-gain, the field pattern of microstrip antenna such as reinvent at the important hot subject that becomes little some antenna of research.
In the Internet of Things field; REID can be divided into two types of active radio frequency identification and passive radio frequency identification, and wherein 900M and 2.4G are the typical application frequency ranges, and both respectively have superiority; Can realize complementation; Adopt the microstrip antenna technology can give full play to the advantage of microstrip antenna, both are organically combined, the separate and performance of two band antennas that are independent of each other.
The utility model content
The embodiment of the utility model provides a kind of antenna assembly and double frequency card reader that is used for the double frequency card reader, can carry out the double frequency Card Reader and can the mutual interference of generation signals phase.
An aspect according to the utility model provides a kind of antenna assembly that is used for the double frequency card reader, comprising: base plate 11; With first and second antenna elements that separate that are in these base plate 11 homonymies, wherein,
Said first antenna element comprises: two first aerial radiation sheets 1, itself and said base plate were opened and were had first earth terminal 3 that is used for DC earthing in 11 minutes; Be connected between said two the first aerial radiation sheets 1 and have first antenna feed structure 2 of the first antenna feed end with constant amplitude homophase feeding classification symmetry; With the first radio frequency seat 4 that is connected to the said first antenna feed end;
Said second antenna element comprises: the second aerial radiation sheet 5; It opened equidistance in 1 minute with these two first aerial radiation sheets between said two first aerial radiation sheets 1; And opened in 11 minutes, and have the second antenna feed end 6 and second earth terminal 7 that is used for DC earthing with said base plate; With the second radio frequency seat that is connected to the said second antenna feed end 6.
Preferably, in each embodiment of the utility model,
Said antenna assembly further comprises: metal antenna blend stop 8; It is fixed to said base plate 11 and has retaining wall, said retaining wall side-prominent between said first antenna feed structure 2 and the said second aerial radiation sheet 5 and towards said first antenna element of being equipped with of said base plate 11 and second antenna element;
And/or
Said base plate 11 comprises the base plate flanging that extends from its at least one edge, and said base plate flanging is towards a lateral buckling of said first antenna element of being equipped with of said base plate 11 and second antenna element;
And/or
Said first antenna feed structure 2 is power strips; Comprise: the lip-deep vertical main body that is fixed to said base plate 11; Extend being connected respectively to two support sections of said two first aerial radiation sheets 1 from the end opposite of this vertical main body respectively, said support section transfers to after the vertical bending of said vertical main body again and is parallel to said vertical Subject Extension.
Preferably, in each embodiment of the utility model,
Said metal antenna blend stop 8 has the blend stop standing part that is fixed on the said base plate 11, and said blend stop standing part and said retaining wall form L shaped cross sectional shape;
And/or
Said base plate flanging bends perpendicular to the surface of said base plate 11;
And/or
The total length of said power strip between said two first aerial radiation sheets 1 is 205-211mm or 211-215mm, and width is 4.8-5.0mm or 5.0-5.2mm, and the thickness that raises up from the surface of said base plate 11 is 0.8-1.0mm or 1.0-1.2mm.
Preferably, in each embodiment of the utility model,
The said first aerial radiation sheet 1 is a rectangle; And/or the said second aerial radiation sheet 5 is a rectangle.
Preferably, in each embodiment of the utility model,
Distance between the retaining wall of the geometric center of the said second aerial radiation sheet 5 and said metal antenna blend stop 8 equals the distance between the lower limb of geometric center and said base plate 11 of the said second aerial radiation sheet 5, and the retaining wall of the lower limb of wherein said base plate 11 and said metal antenna blend stop 8 is respectively at the opposition side of the said second aerial radiation sheet 5.
Preferably, in each embodiment of the utility model,
Distance between the surface of said first aerial radiation sheet 1 and said base plate 11 is 1.8-2.0mm or 2.0-2.2mm;
And/or
And/or
Each said first aerial radiation sheet 1 has first antenna connection terminal; Said first antenna feed structure 2 is connected between said two said first antenna connection terminals; Said two said first antenna connection terminals are with respect to the center of said feed structure 2 symmetry, and said first antenna connection terminal and the said first antenna ground end 3 apart 4-5mm or 5-6mm;
And/or
The first antenna feed end of said first antenna feed structure 2 is at the geometric center place of said first antenna feed structure 2;
And/or
Distance between the surface of said second aerial radiation sheet 5 and said base plate 11 is 1.8-2.0mm or 2.0-2.2mm;
And/or
And/or
The second antenna feed end 6 of the said second aerial radiation sheet 5 and second earth terminal 7 are at a distance of 11.5-12.5mm or 12.5-13.5mm.
Preferably, in each embodiment of the utility model, described antenna assembly further comprises:
And/or
Be filled between the surface of the first aerial radiation sheet 1 and said base plate 11 and/or epoxy layer of cloth or PTFE medium plate between the surface of said second aerial radiation sheet 5 and said base plate 11.
Preferably, in each embodiment of the utility model,
The said first aerial radiation sheet 1 has: linear polarized antenna structure, or horizontally-polarized antenna structure, or vertical polarized antenna structure, or circular polarized antenna structure;
And/or
The said second aerial radiation sheet 5 has linear polarized antenna structure or circular polarized antenna structure or dipole antenna configuration or pico farad (PIFA) antenna structure or whip antenna structure or element antenna structure, and/or
The said second aerial radiation sheet 5 comprises FR4 substrate single-clad board, and/or
The said second aerial radiation sheet 5 has diaphragm.
Preferably, in each embodiment of the utility model,
The said first radio frequency seat and/or the second radio frequency seat are arranged on the side opposite with second antenna element with said first antenna element of said base plate 11;
And/or
The said first radio frequency seat and/or the second radio frequency seat comprise at least a in SMA type, SMB type, TNC type, the N type radio frequency connector.
According to the utility model on the other hand, a kind of double frequency card reader is provided, comprises:
Foregoing antenna assembly;
First card reading module with first operating frequency, it is connected to first antenna feed structure 2 of said first antenna element through the said first radio frequency seat;
Second reading card module with second operating frequency different with said first operating frequency, it is connected to the second antenna feed end 6 of said second antenna element through the said second radio frequency seat.
Antenna assembly that is used for the double frequency card reader and double frequency card reader that embodiment through the utility model provides can be carried out the double frequency Card Reader and can the mutual interference of generation signals phase.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; Below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art; Obviously, the accompanying drawing in below describing only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other embodiment and accompanying drawing thereof according to these accompanying drawing illustrated embodiments.
Fig. 1 a and 1b are respectively end view and the vertical views according to the antenna assembly that is used for the double frequency card reader of the embodiment of the utility model.
Fig. 2 is the sketch map according to the first aerial radiation sheet of the embodiment of the utility model.
Fig. 3 a and 3b are the sketch mapes according to first antenna feed structure of the embodiment of the utility model.
Fig. 4 is the sketch map according to the second aerial radiation sheet of the embodiment of the utility model.
Fig. 5 is the sketch map according to the base plate of the embodiment of the utility model.
Embodiment
Below will combine accompanying drawing that the technical scheme of each embodiment of the utility model is carried out clear, complete description, obviously, described embodiment only is a part of embodiment of the utility model, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are resulting all other embodiment under the prerequisite of not making creative work, all belong to the scope that the utility model is protected.
An aspect according to the utility model provides a kind of antenna assembly that is used for the double frequency card reader, comprising: base plate; With first and second antenna elements that separate that are in this base plate homonymy, wherein,
Said first antenna element comprises: two first aerial radiation sheets, and it separates with said base plate and has first earth terminal that is used for DC earthing; Be connected between said two the first aerial radiation sheets and have first antenna feed structure of the first antenna feed end with constant amplitude homophase feeding classification symmetry; With the first radio frequency seat that is connected to the said first antenna feed end;
Said second antenna element comprises: the second aerial radiation sheet; It separates equidistance with these two first aerial radiation sheets between said two first aerial radiation sheets; And separate, and have the second antenna feed end and second earth terminal that is used for DC earthing with said base plate; With the second radio frequency seat that is connected to the said second antenna feed end.
Fig. 1 a and 1b are respectively end view and the vertical views according to the antenna assembly that is used for the double frequency card reader of the embodiment of the utility model.In the embodiment shown in Fig. 1 a and 1b, the antenna assembly that is used for the double frequency card reader can comprise: base plate 11; With first and second antenna elements that separate that are in these base plate 11 homonymies, wherein,
Said first antenna element comprises: two first aerial radiation sheets 1, itself and said base plate were opened and were had first earth terminal 3 that is used for DC earthing in 11 minutes; Be connected between said two the first aerial radiation sheets 1 and have first antenna feed structure 2 of the first antenna feed end with constant amplitude homophase feeding classification symmetry; With the first radio frequency seat 4 that is connected to the said first antenna feed end;
Said second antenna element comprises: the second aerial radiation sheet 5; It opened equidistance in 1 minute with these two first aerial radiation sheets between said two first aerial radiation sheets 1; And opened in 11 minutes, and have the second antenna feed end 6 and second earth terminal 7 that is used for DC earthing with said base plate; With the second radio frequency seat that is connected to the said second antenna feed end 6.
Thus; Two first aerial radiation sheets 1 (being shown as rectangle among Fig. 1 b) in first antenna element connect through first antenna feed structure 2 (being shown as power strip among Fig. 1 b) symmetry with constant amplitude homophase feeding classification; And the second aerial radiation sheet 5 of second antenna element is between two the first aerial radiation sheets 1, and two first aerial radiation sheets 1 and one second aerial radiation sheet 5 were all opened with base plate and be fit to distance to realize with the air microstrip structure of air as medium in 11 minutes.The second antenna feed end 6 of the first antenna feed end of first antenna element (showing the geometric center place that is in first antenna feed structure 2 among Fig. 1 b) and second antenna element can be connected to corresponding card reading module to realize the aerial signal transmitting-receiving through the corresponding first and second radio frequency seats.Like this, through first antenna element and second antenna element that is in the different operating frequency range, can realize the double frequency card-reading function easily, and can not produce the phase mutual interference.
Preferably, second earth terminal, 7 grounded probes capable of using of first earth terminal 3 of first antenna element and second antenna element are realized DC earthing.
Preferably, the second antenna feed end, the 6 coaxial probe feeding techniques capable of using of second antenna element are realized feed.But, as required, the second antenna feed end 6 also can adopt the feed microstrip line mode.
Though should be understood that in Fig. 1 b, demonstrating first antenna element comprises the two-element antenna battle array that is made up of two first aerial radiation sheets 1, but, the ternary that comprises three or more a plurality of first aerial radiation sheets or multielement array more also can be adopted as required.
Though in the embodiment of the utility model, can adopt constant amplitude homophase feeding classification to realize feed, but, also can adopt other feeding classification as required, for example, constant amplitude is homophase or the out of phase feeding classification of constant amplitude not.
Preferably; In each embodiment of the utility model; Said antenna assembly further comprises: metal antenna blend stop 8; It is fixed to said base plate 11 and has retaining wall, said retaining wall side-prominent between said first antenna feed structure 2 and the said second aerial radiation sheet 5 and towards said first antenna element of being equipped with of said base plate 11 and second antenna element.Like this, the radiation that metal antenna blend stop 8 can be repaired the second aerial radiation sheet 5 of second antenna element on the one hand can reduce the backward radiation of the second aerial radiation sheet 5 on the other hand, and can reduce the phase mutual interference between first antenna element and second antenna element.In the embodiment shown in Fig. 1 b, metal antenna blend stop 8 extends with first antenna feed structure, the 2 almost parallel ground that are illustrated as power strip.
Preferably, in each embodiment of the utility model, said base plate 11 comprises the base plate flanging that extends from its at least one edge, and said base plate flanging is towards a lateral buckling of said first antenna element of being equipped with of said base plate 11 and second antenna element.The base plate flanging can be set at one or more edges of base plate 11; In Fig. 1 b illustrated embodiment; Be provided with the common backplane flanging at upper and lower, left hand edge, for example the base plate flanging 19, and edge is provided with special-purpose flanging 9 on the right; This helps production and assembly on the one hand, also helps reducing the backward radiation of antenna on the other hand.Should be understood that base plate flanging 9 as required (for example according to or when using with the requirement that cooperates of other parts) in its dismounting can carry out accommodation in shape, thereby different with common base plate flanging 19.In Fig. 1 a illustrated embodiment, preferably the bending length of base plate flanging 19 can with the thickness of base plate 11 about equally.Demonstrate a kind of topology layout scheme on the base plate 11 in the embodiment shown in fig. 5.
Preferably; In each embodiment of the utility model; Said first antenna feed structure 2 is power strips; Comprise: be fixed to lip-deep vertical main body 2a of said base plate 11 and extend being connected respectively to two support section 2b of said two first aerial radiation sheets 1 from the end opposite of this vertical main body 2a respectively, said support section 2b transfers to after the vertical bending of said vertical main body 2a again and is parallel to said vertical main body 2a and extends.In Fig. 1 a illustrated embodiment; Power strip is fixed on base plate 11 surfaces to be illustrated as horizontally extending vertical main body 2a; And with support section 2b two first aerial radiation sheets 1 are upwards supported to open in 11 minutes with base plate respectively in right ends; Wherein, support section 2b is parallel to vertical main body 2a and extends to the left and right respectively and be beneficial to support the first aerial radiation sheet 1 from transferring to after vertical main body 2a bends vertically upward again.
Preferably, in each embodiment of the utility model, said metal antenna blend stop 8 has the blend stop standing part that is fixed on the said base plate 11, and said blend stop standing part and said retaining wall form L shaped cross sectional shape.That is to say, in Fig. 1 b when direction is watched metal antenna blend stop 8 from right to left, visible L shaped cross sectional shape, this L shaped cross sectional shape helps production and assembly on the one hand, also helps reducing the backward radiation of antenna on the other hand.
Preferably, in each embodiment of the utility model, said base plate flanging bends perpendicular to the surface of said base plate 11.This helps production and assembly on the one hand, also helps reducing the backward radiation of antenna on the other hand.
Preferably; In each embodiment of the utility model; The total length of said power strip between said two first aerial radiation sheets 1 is 205-211mm or 211-215mm; Width is 4.8-5.0mm or 5.0-5.2mm, and the thickness that raises up from the surface of said base plate 11 is 0.8-1.0mm or 1.0-1.2mm.
Preferably, in each embodiment of the utility model, the said first aerial radiation sheet 1 is a rectangle; And/or the said second aerial radiation sheet 5 is a rectangle.In Fig. 1 b illustrated embodiment, the first aerial radiation sheet 1 and the second aerial radiation sheet 5 are rectangle.This helps making and the assembling location.
Preferably; In each embodiment of the utility model; Distance between the retaining wall of the geometric center of the said second aerial radiation sheet 5 and said metal antenna blend stop 8 equals the distance between the lower limb of geometric center and said base plate 11 of the said second aerial radiation sheet 5, and the retaining wall of the lower limb of wherein said base plate 11 and said metal antenna blend stop 8 is respectively at the opposition side (for example shown in Fig. 1 b) of the said second aerial radiation sheet 5.
Preferably, in each embodiment of the utility model, the distance between the surface of said first aerial radiation sheet 1 and said base plate 11 is 1.8-2.0mm or 2.0-2.2mm.Like this, can realize being fit to the performance of microstrip structure (for example air microstrip structure).
Preferably, in each embodiment of the utility model, first earth terminal 3 of the said first aerial radiation sheet 1 is at the geometric center place of the said first aerial radiation sheet 1, as shown in Fig. 1 b.But, in practical application, first earth terminal 3 also departs to allow distance from the geometric center of the first aerial radiation sheet 1 to the left or to the right.
Preferably; In each embodiment of the utility model; Each said first aerial radiation sheet 1 has first antenna connection terminal; Said first antenna feed structure 2 is connected between said two said first antenna connection terminals, and said two said first antenna connection terminals are with respect to the center of said feed structure 2 symmetry, and said first antenna connection terminal and the said first antenna ground end 3 apart 4-5mm or 5-6mm.
In Fig. 1 b illustrated embodiment; The top position of first earth terminal 3 shown in first antenna connection terminal is arranged on; And be in respectively on the two ends extended line of bar shaped first antenna feed structure 2; Bar shaped first antenna feed structure 2 can be respectively be connected to these two first antenna connection terminals (among Fig. 1 b, the part of being blocked by the first aerial radiation sheet 1 of first antenna feed structure 2 is not shown) with two ends from the dorsal part of the first aerial radiation sheet 1.
Clearer first antenna connection terminal 121 that demonstrates the first aerial radiation sheet 1 in Fig. 2, it is shown as in Fig. 2 with the first antenna ground end and opened a segment distance in 3 minutes.
Visible in the embodiment shown in Fig. 3 a and the 3b; First antenna feed structure 2 of bar shaped has vertical main body 2a and at the support section 2b of opposite end; The first antenna feed end 231 is arranged on the center of vertical main body 2a, and the horizontal-extending of the support section 2b that supports two first aerial radiation sheets 1 at two ends respectively of first antenna feed structure 2 partly is provided with connecting portion 232 and realizes corresponding support function with first antenna connection terminal 121 that is connected respectively to the corresponding first aerial radiation sheet 1 (for example connecting through metallic screw or bolt and nut).
Preferably, in each embodiment of the utility model, the first antenna feed end of said first antenna feed structure 2 is at the geometric center place of said first antenna feed structure 2, as shown in Fig. 1 b.
Preferably, in each embodiment of the utility model, the distance between the surface of said second aerial radiation sheet 5 and said base plate 11 is 1.8-2.0mm or 2.0-2.2mm.Like this, can realize being fit to the performance of microstrip structure (for example air microstrip structure).
Preferably, in each embodiment of the utility model, second earth terminal 7 of the said second aerial radiation sheet 5 is at the geometric center place of the said second aerial radiation sheet 5, as shown in Fig. 1 b.
Preferably, in each embodiment of the utility model, the second antenna feed end 6 of the said second aerial radiation sheet 5 and second earth terminal 7 are at a distance of 11.5-12.5mm or 12.5-13.5mm.In Fig. 1 b illustrated embodiment, second earth terminal 7 is in the geometric center place of the second aerial radiation sheet 5, and the second antenna feed end 6 is in second earth terminal, 7 belows also at a distance of 11.5-12.5mm or 12.5-13.5mm, more clearly as shown in Figure 4.
Preferably; In each embodiment of the utility model; Described antenna assembly further comprises: insulation column 10, it is installed in or the surface of extending from the surface of said base plate 11 the said first aerial radiation sheet 1 and/or the said second aerial radiation sheet 5 are supported for said base plate 11 separates.Visible in Fig. 1 a illustrated embodiment; In fact insulation column 10 can be one or more; And the installing component that both can be separation also can be the extension that is integrated in base plate 11; In order to guaranteeing that the first aerial radiation sheet 1 and/or the second aerial radiation sheet 5 and the surface of base plate 11 separate, thereby realize the performance of microstrip structure (for example air microstrip structure).
Preferably; In each embodiment of the utility model, described antenna assembly further comprises: be filled between the surface of the first aerial radiation sheet 1 and said base plate 11 and/or epoxy layer of cloth or PTFE medium plate between the surface of said second aerial radiation sheet 5 and said base plate 11.Like this; Between the first aerial radiation sheet 1 and/or the second aerial radiation sheet 5 and base plate 11, fill the solid dielectric structure; Thereby form solid dielectric structure (for example epoxy resin medium microstrip structure or PTFE medium microstrip structure), this with aforesaid be different as the air microstrip structure of medium only with air.
Preferably, in each embodiment of the utility model, the said first aerial radiation sheet 1 has: linear polarized antenna structure, or horizontally-polarized antenna structure, or vertical polarized antenna structure, or circular polarized antenna structure.
Preferably, in each embodiment of the utility model, the said second aerial radiation sheet 5 has linear polarized antenna structure or circular polarized antenna structure or dipole antenna configuration or pico farad (PIFA) antenna structure or whip antenna structure or element antenna structure.
Preferably, in each embodiment of the utility model, the said second aerial radiation sheet 5 comprises FR4 substrate single-clad board.
Preferably, in each embodiment of the utility model, the said second aerial radiation sheet 5 has diaphragm.
Preferably, in each embodiment of the utility model, the said first radio frequency seat and/or the second radio frequency seat are arranged on the side opposite with second antenna element with said first antenna element of said base plate 11.
Preferably, in each embodiment of the utility model, the said first radio frequency seat and/or the second radio frequency seat comprise at least a in SMA type, SMB type, TNC type, the N type radio frequency connector.
According to the utility model on the other hand, a kind of double frequency card reader is provided, comprises:
Foregoing antenna assembly;
First card reading module with first operating frequency, it is connected to first antenna feed structure 2 of said first antenna element through the said first radio frequency seat;
Second reading card module with second operating frequency different with said first operating frequency, it is connected to the second antenna feed end 6 of said second antenna element through the said second radio frequency seat.
Antenna assembly that is used for the double frequency card reader and double frequency card reader that embodiment through the utility model provides can be carried out the double frequency Card Reader and can the mutual interference of generation signals phase.
Embodiment according to the utility model; A kind of antenna assembly that adopts the air dielectric microstrip structure is provided; The microstrip antenna device of two-band particularly; Can be used for the double frequency card reader, this antenna assembly has also that directionality is good, gain is high simultaneously, impedance matching well reaches advantages such as size is less with the passive and active technical compatibility in radio frequency identification (RFID) technology together.Two parts of the dual-band antenna device that the embodiment of the utility model provides (promptly; First antenna element or the first aerial radiation sheet; With second antenna element or the second aerial radiation sheet) be separate, independent installation is used as required, and the antenna performance parameters that do not influence each other; Thereby simple to the antenna assembly manufacturing technique requirent, make the antenna assembly best performanceization.Wherein, first antenna feed structure in first antenna element can adopt integrated design, thereby helps large batch of production.
In an embodiment of the utility model, to present application demand in field of radio frequency identification, a kind of antenna assembly that is used for the double frequency card reader is provided, can support passive and active two kinds of radio frequency identification (RFID) working method simultaneously.The design of this antenna assembly is theoretical and time-domain finite element method simulation optimization method based on the microstrip antenna Application Design; The input impedance of antenna arrangement is 50 Ω; This antenna assembly can be made up of two parts; Wherein, first antenna element can comprise binary rectangular microstrip antenna battle array (for example being made up of two first aerial radiation sheets shown in Fig. 1 b), and operating frequency is 920-925MHz; And second antenna element can adopt the circular polarization element antenna (for example being made up of one second aerial radiation sheet shown in Fig. 1 b) of coaxial probe feed, and operating frequency is at 2.4-2.5GHz.Thus, can realize the double frequency card-reading function.Antenna device arrangement according to the utility model embodiment is ingenious, simple, and processing technology is less demanding, and production and assembly are fit to the production line continuous productive process, and the antenna assembly particular product performance parameters is stable, and low production cost uses but also can be built in the compound all-in-one.
In an embodiment of the utility model, a kind of antenna assembly that is used for the double frequency card reader is provided, it is based on microstrip antenna Application Design principle design, and employing FInite Element all-wave Electromagnetic Simulation technical optimization antenna parameter performance.Wherein, antenna assembly adopts the air dielectric microstrip structure, and two port design input impedance are 50 Ω of standard, uses standard SMA radio frequency seat to be connected with circuit board.Said antenna assembly can be made up of two parts: first antenna element (comprising the first aerial radiation sheet) and second antenna element (comprising the second aerial radiation sheet); Wherein, First antenna element can comprise binary rectangular microstrip antenna battle array (for example being made up of two first aerial radiation sheets shown in Fig. 1 b), can adopt the horizontally-polarized antenna structure, and its operating frequency is 920-925MHz; Adopt the beamwidth of constant amplitude homophase feeding technique compression antenna, to improve the gain of antenna in vertical direction; And second antenna element can comprise element antenna (for example being made up of one second aerial radiation sheet shown in Fig. 1 b), and element antenna can adopt the rectangular microstrip antenna structure of certain thickness air dielectric, and input impedance designs according to 100 Ω.The aerial radiation sheet of first antenna element and second antenna element is a metallic plate, and available bilateral plastic nut is riveted radiation fin on the antenna assembly base plate double-screw bolt (for example high 3mm) is gone up fixing.The antenna assembly base plate is riveted on double-screw bolt (for example high 15mm) in aerial radiation sheet center, as the DC earthing point of antenna.In the antenna array of first antenna element; The spacing of two radiation fins is that 0.5-0.9 wavelength doubly (is the wavelength of electromagnetic wave in little band medium; When only adopting air, be wavelength) to air dielectric as little band medium; Secondary lobe appears in the directional diagram of the excessive then antenna of spacing, the too small effect that does not then have compression wave beam, raising gain of spacing.Preferably, according to antenna miniaturization thought, the spacing of two radiation fins can be taken as 0.6 times of wavelength.First antenna feed structure in first antenna element (for example at first antenna feed structure 2 shown in Fig. 1 a, the 1b) is an innovative point of the utility model; The air microstrip line that can adopt bonding jumper (for example the wide 1mm of 5mm is thick) design 100 Ω is as first antenna feed structure; This moment, the bonding jumper lower surface was apart from Antenna baseplate upper surface one segment distance (for example 2mm); Input impedance is 50 Ω after two aerial radiation sheets parallel connection of first antenna element, realizes the standard design of the first antenna element input impedance.In the terminal vertical bending of first antenna feed structure 2 then in the level bending and overlapping with the plane of the first aerial radiation sheet 1; Preferably can on first antenna feed structure, process screw thread and with metallic screw two first aerial radiation sheets and first antenna feed structure are tightened fixing, to accomplish the feed design of first antenna element.Can be in the center of first antenna feed structure perforate Antenna baseplate relevant position perforate simultaneously; Form female thread structure; SMA seat outer conductor is fixed on outside the Antenna baseplate, and SMA seat inner wire inserts in the corresponding perforate of first antenna feed structure fixing with the welding of high temperature flatiron.In second antenna element, can adopt the air microstrip aerial that utilizes the corner cut perturbation method to realize circular polarization, to antenna feed, working frequency range is 2.4-2.5GHz with probe.The second aerial radiation sheet of second antenna element can preferably can further form metal level (for example covering the gold-plated or formation copper tin layer of copper) for made the single face pcb board structure of substrate by the FR4 substrate of 1.6mm, plays a protective role.The second aerial radiation sheet DC earthing post capable of using of second antenna element and probe supports, fixing.Preferably, for the directional diagram symmetry that guarantees second antenna element, reduce and first antenna element between influence each other, an antenna blend stop that is used to isolate can be set on Antenna baseplate, it is asymmetric to also help the directional diagram that prevents second antenna element simultaneously.
In an embodiment of the utility model, a kind of antenna assembly that is used for the double frequency card reader is provided, it is made up of first antenna element and second antenna element two parts, and the two organically blends on an Antenna baseplate.There are corresponding perforate, riveted joint double-screw bolt and riveting nut some on the Antenna baseplate, are used for fixing the aerial radiation sheet.First antenna element comprises two first aerial radiation sheets, first antenna feed structure, a standard SMA radio frequency seat and corresponding link (for example, eight bilateral plastic nuts and metal nuts, pad, bullet pad some).At first SMA radio frequency seat is fixed on the Antenna baseplate back side; Then bilateral nut (for example 10mm) is screwed on the Antenna baseplate; On the DC earthing post (connecting first earth terminal) of first antenna element, put into plastic mattress post (for example high 10mm), again the first aerial radiation sheet is fixed on the bilateral plastic nut with plastic screw; First antenna feed structure is arranged between the first aerial radiation sheet and the Antenna baseplate; And the inner wire of the first radio frequency seat of SMA type inserted in the power feed hole of first antenna feed structure; At the Kong Weiyong of correspondence metallic screw two first aerial radiation sheets of first antenna element and first antenna feed structure are tightened then and be fixed together; Wherein, DC earthing post available metal nut screwing clamping is fixed.For second antenna element, the SMA type second radio frequency seat is fixed on the Antenna baseplate, and the DC earthing post of second antenna element is encased inside plastic mattress (for example diameter 10mm, thick 2mm), and the second aerial radiation sheet is set, and tightens with metal nuts and is fixed to the DC earthing post.Then, respectively inner wire and the first aerial radiation sheet, the second aerial radiation sheet of the first and second radio frequency seats welded together.Install or be provided with the antenna blend stop at last, accomplish the assembling of entire antenna device.
Should be understood that the first aerial radiation sheet and the size of the second aerial radiation sheet in first antenna element and second antenna element can adjust as required, to satisfy the application of different frequency scope.
In an embodiment of the utility model, a kind of antenna assembly that is used for the double frequency card reader is provided, can support passive and active two kinds of radio frequency identification (RFID) working method simultaneously.The design of said antenna assembly is theoretical and time-domain finite element method simulation optimization method based on the microstrip antenna Application Design, and its characteristic comprises:
1) can adopt the air dielectric microstrip structure to realize feed, have miniaturization Design, volume is little.
2) can adopt the lightning protection measures of DC earthing structure,
3) can form by first antenna element and second antenna element two parts, comprise the first aerial radiation sheet and the second aerial radiation sheet respectively.
4) first antenna element can comprise binary rectangular microstrip antenna battle array, and its operating frequency can be 920-925MHz.
5) the first aerial radiation sheet in first antenna element can have the horizontally-polarized antenna structure.
6) can adopt constant amplitude homophase feeding technique in first antenna element.
7) part of first antenna feed in first antenna element can adopt the air microstrip structure.
8) the second aerial radiation sheet in second antenna element can have the element antenna structure, and its operating frequency can be 2.4-2.5GHz.
9) the second aerial radiation sheet in second antenna element can adopt the coaxial probe feeding technique.
10) the second aerial radiation sheet in second antenna element can adopt the corner cut perturbation method to realize antenna circular polarization.
11) output impedance of first antenna element and second antenna element can be 50 Ω, and can all adopt standard SMA radio frequency seat to be connected with follow-up card reading module circuit to realize the double frequency card-reading function.
In each embodiment of the utility model, all can adopt metal threaded fastening mode to realize being electrically connected, then can adopt insulating material (for example plastics) to realize non-conductive support for the structure that only need play a supporting role.
Beneficial effect according to the antenna assembly that is used for the double frequency card reader of each embodiment of the utility model comprises: structural design is ingenious, simple, and processing technology is less demanding, is convenient to the production streamlined operation of producing, assembling; Antenna each several part modularization independent design; Can be according to the increase and decrease of function needs, the antenna product performance parameter is stable, low production cost; Can be built in the compound all-in-one and use, have higher application in industry and be worth.
The various embodiment that the utility model provides can make up with any-mode as required each other, and the technical scheme that obtains through this combination is also in the scope of the utility model.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also comprises these changes and modification interior.
Claims (10)
1. an antenna assembly that is used for the double frequency card reader is characterized in that, comprising: base plate (11); With first and second antenna elements that separate that are in this base plate (11) homonymy, wherein,
Said first antenna element comprises: two first aerial radiation sheets (1), and it separates with said base plate (11) and has first earth terminal (3) that is used for DC earthing; Be connected between said two the first aerial radiation sheets (1) and have first antenna feed structure (2) of the first antenna feed end with constant amplitude homophase feeding classification symmetry; With the first radio frequency seat (4) that is connected to the said first antenna feed end;
Said second antenna element comprises: the second aerial radiation sheet (5); It separates equidistance with these two first aerial radiation sheets (1) between said two first aerial radiation sheets (1); And separate, and have the second antenna feed end (6) and be used for second earth terminal (7) of DC earthing with said base plate (11); With the second radio frequency seat that is connected to the said second antenna feed end (6).
2. antenna assembly as claimed in claim 1 is characterized in that,
Said antenna assembly further comprises: metal antenna blend stop (8); It is fixed to said base plate (11) and has retaining wall, and said retaining wall is positioned between said first antenna feed structure (2) and the said second aerial radiation sheet (5) and side-prominent towards said first antenna element of being equipped with of said base plate (11) and second antenna element;
And/or
Said base plate (11) comprises the base plate flanging that extends from its at least one edge, and said base plate flanging is towards a lateral buckling of said first antenna element of being equipped with of said base plate (11) and second antenna element;
And/or
Said first antenna feed structure (2) is a power strip; Comprise: the lip-deep vertical main body that is fixed to said base plate (11); Extend being connected respectively to two support sections of said two first aerial radiation sheets (1) from the end opposite of this vertical main body respectively, said support section transfers to after the vertical bending of said vertical main body again and is parallel to said vertical Subject Extension.
3. antenna assembly as claimed in claim 2 is characterized in that,
Said metal antenna blend stop (8) has the blend stop standing part that is fixed on the said base plate (11), and said blend stop standing part and said retaining wall form L shaped cross sectional shape;
And/or
Said base plate flanging bends perpendicular to the surface of said base plate (11);
And/or
The total length of said power strip between said two first aerial radiation sheets (1) is 205-211mm or 211-215mm, and width is 4.8-5.0mm or 5.0-5.2mm, and the thickness that raises up from the surface of said base plate (11) is 0.8-1.0mm or 1.0-1.2mm.
4. antenna assembly as claimed in claim 1 is characterized in that,
The said first aerial radiation sheet (1) is a rectangle; And/or the said second aerial radiation sheet (5) is a rectangle.
5. like each described antenna assembly in the claim 2 to 4, it is characterized in that,
Distance between the retaining wall of the geometric center of the said second aerial radiation sheet (5) and said metal antenna blend stop (8) equals the distance between the lower limb of geometric center and said base plate (11) of the said second aerial radiation sheet (5), and the retaining wall of the lower limb of wherein said base plate (11) and said metal antenna blend stop (8) is respectively at the opposition side of the said second aerial radiation sheet (5).
6. like each described antenna assembly in the claim 1 to 4, it is characterized in that,
Distance between the surface of said first aerial radiation sheet (1) and said base plate (11) is 1.8-2.0mm or 2.0-2.2mm;
And/or
First earth terminal (3) of the said first aerial radiation sheet (1) is at the geometric center place of the said first aerial radiation sheet (1);
And/or
Each said first aerial radiation sheet (1) has first antenna connection terminal; Said first antenna feed structure (2) is connected between said two said first antenna connection terminals; Said two said first antenna connection terminals are with respect to the center of said feed structure (2) symmetry, and said first antenna connection terminal and the said first antenna ground end (3) apart 4-5mm or 5-6mm;
And/or
The first antenna feed end of said first antenna feed structure (2) is at the geometric center place of said first antenna feed structure (2);
And/or
Distance between the surface of said second aerial radiation sheet (5) and said base plate (11) is 1.8-2.0mm or 2.0-2.2mm;
And/or
Second earth terminal (7) of the said second aerial radiation sheet (5) is at the geometric center place of the said second aerial radiation sheet (5);
And/or
Second antenna feed end (6) of the said second aerial radiation sheet (5) and second earth terminal (7) are at a distance of 11.5-12.5mm or 12.5-13.5mm.
7. like each described antenna assembly in the claim 1 to 4, it is characterized in that, further comprise:
Insulation column (10), it is installed in or the surface of extending from the surface of said base plate (11) the said first aerial radiation sheet (1) and/or the said second aerial radiation sheet (5) are supported for said base plate (11) separates;
And/or
Be filled between the surface of the first aerial radiation sheet (1) and said base plate (11) and/or epoxy layer of cloth or PTFE medium plate between the surface of said second aerial radiation sheet (5) and said base plate (11).
8. like each described antenna assembly in the claim 1 to 4, it is characterized in that,
The said first aerial radiation sheet (1) has: linear polarized antenna structure, or horizontally-polarized antenna structure, or vertical polarized antenna structure, or circular polarized antenna structure;
And/or
The said second aerial radiation sheet (5) has linear polarized antenna structure or circular polarized antenna structure or dipole antenna configuration or pico farad PIFA antenna structure or whip antenna structure or element antenna structure, and/or
The said second aerial radiation sheet (5) comprises FR4 substrate single-clad board, and/or
The said second aerial radiation sheet (5) has diaphragm.
9. like each described antenna assembly in the claim 1 to 4, it is characterized in that,
The said first radio frequency seat and/or the second radio frequency seat are arranged on the side opposite with second antenna element with said first antenna element of said base plate (11);
And/or
The said first radio frequency seat and/or the second radio frequency seat comprise at least a in SMA type, SMB type, TNC type, the N type radio frequency connector.
10. a double frequency card reader is characterized in that, comprising:
Like each described antenna assembly in the claim 1 to 9;
First card reading module with first operating frequency, it is connected to first antenna feed structure (2) of said first antenna element through the said first radio frequency seat;
Second reading card module with second operating frequency different with said first operating frequency, it is connected to the second antenna feed end (6) of said second antenna element through the said second radio frequency seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204740312U CN202333144U (en) | 2011-11-24 | 2011-11-24 | Antenna device for double-frequency card reader and double-frequency card reader |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204740312U CN202333144U (en) | 2011-11-24 | 2011-11-24 | Antenna device for double-frequency card reader and double-frequency card reader |
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| CN202333144U true CN202333144U (en) | 2012-07-11 |
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| CN2011204740312U Expired - Fee Related CN202333144U (en) | 2011-11-24 | 2011-11-24 | Antenna device for double-frequency card reader and double-frequency card reader |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10522915B2 (en) | 2017-02-01 | 2019-12-31 | Shure Acquisition Holdings, Inc. | Multi-band slotted planar antenna |
| US20240097772A1 (en) * | 2022-09-19 | 2024-03-21 | International Business Machines Corporation | Amplitude and phase alignment of phased array elements |
-
2011
- 2011-11-24 CN CN2011204740312U patent/CN202333144U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10522915B2 (en) | 2017-02-01 | 2019-12-31 | Shure Acquisition Holdings, Inc. | Multi-band slotted planar antenna |
| US20240097772A1 (en) * | 2022-09-19 | 2024-03-21 | International Business Machines Corporation | Amplitude and phase alignment of phased array elements |
| US12284020B2 (en) * | 2022-09-19 | 2025-04-22 | International Business Machines Corporation | Amplitude and phase alignment of phased array elements |
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Granted publication date: 20120711 Termination date: 20201124 |