CN112928458A - Dual-frequency antenna structure and antenna system - Google Patents
Dual-frequency antenna structure and antenna system Download PDFInfo
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- CN112928458A CN112928458A CN201911244340.8A CN201911244340A CN112928458A CN 112928458 A CN112928458 A CN 112928458A CN 201911244340 A CN201911244340 A CN 201911244340A CN 112928458 A CN112928458 A CN 112928458A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
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Abstract
本发明提供了一种双频天线结构及天线系统，包括介质板、金属地、第一天线枝节和第二天线枝节，介质板具有正面和背面，金属地和第一天线枝节设于介质板的正面，且金属地和第一天线枝节之间具有馈电点，第二天线枝节设于介质板的背面，介质板具有电连接第一天线枝节和第二天线枝节的金属过孔，第一天线枝节和第二天线枝节于介质板的正面的投影具有重叠区域。本发明提供的双频天线结构，通过调节重叠区域的尺寸来调整介质板正反面的第一天线枝节和第二天线枝节的等效电容值，利用等效电容加载效果灵活调节谐振频点的位置，无需增加天线枝节，保持天线的体积不变的条件下，还能调节天线的频点。
The invention provides a dual-frequency antenna structure and an antenna system, comprising a dielectric plate, a metal ground, a first antenna branch and a second antenna branch, the dielectric plate has a front and a back, and the metal ground and the first antenna branch are arranged on the bottom of the dielectric plate. The front side has a feeding point between the metal ground and the first antenna branch, the second antenna branch is arranged on the back of the dielectric board, and the dielectric board has metal vias that electrically connect the first antenna branch and the second antenna branch. The first antenna The projection of the stub and the second antenna stub on the front face of the dielectric plate has an overlapping area. In the dual-frequency antenna structure provided by the present invention, the equivalent capacitance values of the first antenna branch and the second antenna branch on the front and back of the dielectric plate are adjusted by adjusting the size of the overlapping area, and the position of the resonance frequency point is flexibly adjusted by using the equivalent capacitance loading effect. , without adding antenna branches, and under the condition of keeping the volume of the antenna unchanged, the frequency point of the antenna can be adjusted.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a dual-frequency antenna structure and an antenna system.
Background
The reason why the dual-frequency antenna generates dual-frequency like the dual-frequency wifi antenna is that two antenna branches are provided, although the dual-frequency characteristic can be realized by the structural form of the two antenna branches, the volume of the antenna is inevitably increased, and under the condition that the sizes of the antennas such as the terminal antenna are limited, the antenna with larger volume cannot be applied to the equipment with compact structure, which is not beneficial to the high integration of the antenna.
Disclosure of Invention
The invention aims to provide a dual-frequency antenna structure to solve the technical problem that the dual-frequency antenna in the prior art is large in size.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a dual-band antenna structure, includes board, metal ground, first antenna minor matters and second antenna minor matters, the dielectric-slab has front and back, the metal ground with first antenna minor matters is located the front of dielectric-slab, just the metal ground with feed point has between the first antenna minor matters, second antenna minor matters is located the back of dielectric-slab, the dielectric-slab has the electricity and connects the metal via hole of first antenna minor matters with the second antenna minor matters, first antenna minor matters with the second antenna minor matters in the projection of the front of dielectric-slab has overlap region.
In one embodiment, the number of the overlapping regions is three, respectively a first overlapping region, a second overlapping region and a third overlapping region; the first antenna branch section comprises a first metal section and a second metal section, the second antenna branch section comprises a third metal section and a fourth metal section, the first end of the first metal section is the feeding point, the first overlapping area is arranged between the second end of the first metal section and the first end of the third metal section, the second overlapping area is arranged between the first end of the second metal section and the second end of the third metal section, and the third overlapping area is arranged between the second end of the second metal section and the first end of the fourth metal section.
In one embodiment, the first antenna stub and the second antenna stub each have a width of 0.5 mm.
In one embodiment, the third metal segment is L-shaped, the length of the segment of the third metal segment overlapping the first metal segment is 4mm, and the length of the segment of the third metal segment overlapping the second metal segment is 10 mm.
In one embodiment, the first overlapping area has a length of 1mm, the second overlapping area has a length of 3mm, and the third overlapping area has a length of 3 mm.
In one embodiment, the first metal segment has a length of 4mm, the second metal segment has a length of 10mm, and the fourth metal segment has a length of 10 mm.
In one embodiment, the two frequency points of the dual-frequency antenna structure are 2.4GHz and 5.8GHz respectively.
In one embodiment, the second overlapping area is a current minimum point.
In one embodiment, the metal via is disposed in the first overlap region.
The invention also provides an antenna system which comprises the dual-frequency antenna structure.
The double-frequency antenna structure and the antenna system provided by the invention have the beneficial effects that: compared with the prior art, the dual-frequency antenna structure comprises a dielectric plate, a metal ground, a first antenna branch and a second antenna branch, wherein the metal ground and the first antenna branch are arranged on the front surface of the dielectric plate, a feeding point is arranged between the metal ground and the first antenna branch, and the second antenna branch is arranged on the back surface of the dielectric plate. The dielectric plate is provided with a metal through hole which is electrically connected with the first antenna branch and the second antenna branch, and the inductance loading effect is carried out through the metal through hole.
The antenna with a single metal branch is called a monopole antenna, the monopole antenna has a quarter-wavelength resonance point frequency and a three-quarter-wavelength resonance point frequency, for example, when a quarter-wavelength resonance is generated at 2.4GHz, the three-quarter-wavelength resonance point frequency can be generated at 7.2GHz, but when the two frequency points do not conform to two frequency points required by the antenna, if the required frequency points are 2.4GHz and 5.8GHz, one antenna branch can be added to meet another frequency point in the prior art, an overlapping area is arranged on the front surface of the dielectric plate in the projection of the first metal branch and the second metal branch, the equivalent capacitance values of the first antenna branch and the second antenna branch on the front surface and the back surface of the dielectric plate are adjusted by adjusting the size of the overlapping area, and the position of the resonance is flexibly adjusted by using the equivalent capacitance loading effect, so that the other frequency point also meets the required frequency point value. Antenna branches are not required to be added, and the frequency point of the antenna can be adjusted under the condition that the size of the antenna is not changed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic front structural diagram of a dual-band antenna structure according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a back side structure of a dual-band antenna structure according to an embodiment of the present invention;
fig. 3 is a perspective view of a dual-band antenna structure provided by an embodiment of the present invention;
fig. 4 is a current distribution diagram of a dual-band antenna structure according to an embodiment of the present invention;
fig. 5 is a simulation curve of S11 for the dual-band antenna structure according to the present invention and the monopole antenna according to the prior art.
Wherein, in the figures, the respective reference numerals:
1-a dielectric plate; 10-a metal via; 11-a first overlap region; 12-a second overlapping area; 13-a third overlapping area; 2-metal ground; 3-a first antenna branch; 31-a first metal segment; 32-a second metal segment; 4-a second antenna stub; 41-a third metal section; 42-a fourth metal segment; 5-feeding point.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
A dual-band antenna structure provided in an embodiment of the present invention will now be described.
Referring to fig. 1 to 3, in one embodiment of the dual-band antenna structure, the dual-band antenna structure includes a dielectric plate 1, a metal ground 2, a first antenna branch 3 and a second antenna branch 4. The dielectric plate 1 has a front surface and a back surface, the metal ground 2 and the first antenna branch 3 are arranged on the front surface of the dielectric plate 1, a feeding point 5 is arranged between the metal ground 2 and the first antenna branch 3, and the dual-frequency antenna structure is fed from the feeding point 5. The second antenna is arranged on the back of the dielectric plate 1, the dielectric plate 1 is provided with a metal through hole 10 electrically connected with the first antenna branch 3 and the second antenna branch 4, and the inductance loading effect is carried out through the metal through hole 10. The projections of the first metal branch and the second metal branch on the front surface of the dielectric plate 1 are provided with an overlapping area, the equivalent capacitance values of the first antenna branch 3 and the second antenna branch 4 on the front surface and the back surface of the dielectric plate 1 are adjusted by adjusting the size of the overlapping area, and the positions of resonance frequency points are flexibly adjusted by utilizing the equivalent capacitance loading effect.
More specifically, the single metal stub antenna is referred to as a monopole antenna, which has a quarter-wavelength resonant point frequency and a three-quarter-wavelength resonant point frequency, for example, a quarter-wave resonance at 2.4GHz, a three-quarter-wave resonance point frequency at 7.2GHz, however, when the two frequency points do not match with the two frequency points required by the antenna, if the required frequency points are 2.4GHz and 5.8GHz, one antenna branch is added to meet the requirement of the other frequency point in the prior art, the scheme sets an overlapping area on the projections of the first metal branch and the second metal branch on the front surface of the dielectric plate 1, the equivalent capacitance values of the first antenna branch 3 and the second antenna branch 4 on the front side and the back side of the dielectric plate 1 are adjusted by adjusting the size of the overlapping area, and the position of a resonance frequency point is flexibly adjusted by utilizing the equivalent capacitance loading effect, so that the other frequency point also meets the required frequency point value. Antenna branches are not required to be added, and the frequency point of the antenna can be adjusted under the condition that the size of the antenna is not changed.
Alternatively, the dielectric constant of the dielectric sheet 1 is between 2 and 8.
Referring to fig. 3, in one embodiment of the dual-band antenna structure, the number of the overlapping areas is three to meet the requirement of frequency point adjustment. The number of overlapping areas may also be one, two, four, etc., and the specific number is not limited herein. When the number of the overlapping areas is three, there are a first overlapping area 11, a second overlapping area 12, and a third overlapping area 13, respectively. Correspondingly, the first antenna branch 3 comprises a first metal segment 31 and a second metal segment 32, and the second antenna branch 4 comprises a third metal segment 41 and a fourth metal segment 42. The first end of the first metal segment 31 is the feeding point 5, the second end of the first metal segment 31 and the first end of the third metal segment 41 have a first overlapping area 11 therebetween, the first end of the second metal segment 32 and the second end of the third metal segment 41 have a second overlapping area 12, and the second end of the second metal segment 32 and the first end of the fourth metal segment 42 have a third overlapping area 13. Thus, the dual-frequency antenna structure has three overlapping areas to meet the resonance requirement. When the length and the position of the overlapping area are changed, the sizes of the two resonance frequency points are also changed correspondingly.
Further, referring to fig. 3, the third metal segment 41 is L-shaped, so that the dual-band antenna structure is a monopole antenna. One end of the third metal segment 41 overlaps the first metal segment 31, and the other end of the third metal segment 41 overlaps the second metal segment 32.
Referring to fig. 4, fig. 4 is a current distribution diagram of the dual-band antenna structure in the above embodiment when feeding at 5.8 GHz. The direction of the arrow is the direction of the current. It can be seen that the current at the red circle is inversely cancelled, where the current is minimal, where the overlap region is provided, i.e. the capacitive loading effect is quite pronounced, so the overlap region is provided at this point in fig. 3 to enhance the tuning effect.
Referring to fig. 1 to 3, in one embodiment of the dual-band antenna structure, the widths of the first antenna branch 3 and the second antenna branch 4 are both 0.5 mm. When the third metal segment 41 is L-shaped, the length of the segment where the third metal segment 41 overlaps the first metal segment 31 is 4mm, and the length of the segment where the third metal segment 41 overlaps the second metal segment 32 is 10 mm. The length of the first overlap region 11 is 1mm, the length of the second overlap region 12 is 3mm, and the length of the third overlap region 13 is 3 mm. The length of the first metal segment 31 is 4mm, the length of the second metal segment 32 is 10mm, and the length of the fourth metal segment 42 is 10mm, so that when one frequency point of the dual-band antenna structure in this embodiment is 2.4GHz, the other frequency point can be adjusted to 5.8GHz by the arrangement of the overlapping region. Therefore, the frequency point of the antenna is adjusted under the action of capacitance loading, no metal branch is required to be additionally arranged, and the required double frequency point can be realized by ensuring that the volume of the antenna is unchanged. More specifically, when two frequency points of the dual-frequency antenna structure are 2.4GHz and 5.8GHz respectively, the wifi frequency band is satisfied.
Of course, the first antenna branch 3 and the second antenna branch 4 may have other widths and lengths, and the sizes of the first antenna branch 3 and the second antenna branch 4 may be set according to a desired frequency point, and the sizes are not limited herein.
Referring to fig. 3, in one embodiment of the dual-band antenna structure, the metal via 10 is disposed in the first overlapping area 11. The first overlapping area 11, the second overlapping area 12 and the third overlapping area 13 are located at a greater distance from the feeding point 5, and the metal via 10 is disposed in the first overlapping area 11, so that the second overlapping area 12 and the third overlapping area 13 form a capacitive load.
Referring to fig. 5, fig. 5 is a graph illustrating simulation curves of the reflection coefficient of S11 of the dual-band antenna structure and the conventional monopole antenna in fig. 3. Specifically, the dielectric plate 1 in fig. 3 has a dielectric constant of 6 and the specific dimensions are as follows: the width of the first antenna stub 3 and the width of the second antenna stub 4 are both 0.5 mm. The third metal segment 41 is L-shaped, the length of the segment where the third metal segment 41 overlaps the first metal segment 31 is 4mm, and the length of the segment where the third metal segment 41 overlaps the second metal segment 32 is 10 mm. The length of the first overlap region 11 is 1mm, the length of the second overlap region 12 is 3mm, and the length of the third overlap region 13 is 3 mm. The length of the first metal segment 31 is 4mm, the length of the second metal segment 32 is 10mm, and the length of the fourth metal segment 42 is 10 mm. The common monopole antenna is arranged on one side of the dielectric plate 1, the dielectric constant of the dielectric plate 1 is also 6, the widths of the vertical section and the horizontal section of the common monopole antenna are both 0.5mm, the length of the vertical section is 7mm, and the length of the horizontal section is 24 mm. In fig. 5, the abscissa is the resonant frequency, the ordinate is the S11 reflection coefficient, and the dotted line is the S11 simulation curve in the present embodiment, which is implemented as the S11 simulation curve of the ordinary monopole antenna. As can be seen from the S11 simulation curve in the embodiment in fig. 5, the dual-band antenna structure in the embodiment has two frequency points 1 and 2 in the figure, which are 2.6GHz and 5.8GHz, respectively, and meets the requirement of dual-band wifi frequency point. As can be seen from the S11 curve of the conventional monopole antenna in fig. 5, the antenna has two frequency points of 3 and 4, which are 2.5GHz and 7.6GHz, respectively, i.e., a quarter-wavelength mode resonance point frequency and a three-quarter-wavelength mode resonance point frequency.
The invention also provides an antenna system, which comprises the dual-band antenna structure in any embodiment.
The antenna system of the above embodiment adopts the dual-frequency antenna structure in any of the above embodiments, the dual-frequency antenna structure sets an overlap region in the projections of the first metal branch and the second metal branch on the front surface of the dielectric plate 1, the equivalent capacitance values of the first antenna branch 3 and the second antenna branch 4 on the front surface and the back surface of the dielectric plate 1 are adjusted by adjusting the size of the overlap region, and the positions of the resonant frequency points are flexibly adjusted by using the equivalent capacitance loading effect, so that the other frequency point also meets the required frequency point value. Antenna branches are not required to be added, and the frequency point of the antenna can be adjusted under the condition that the size of the antenna is not changed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911244340.8A CN112928458B (en) | 2019-12-06 | Dual-frequency antenna structure and antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911244340.8A CN112928458B (en) | 2019-12-06 | Dual-frequency antenna structure and antenna system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112928458A true CN112928458A (en) | 2021-06-08 |
| CN112928458B CN112928458B (en) | 2025-04-15 |
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| CN102629708A (en) * | 2011-12-27 | 2012-08-08 | 广西工学院 | WIFI (wireless fidelity) mobile terminal plane antenna |
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| CN210838096U (en) * | 2019-12-06 | 2020-06-23 | 昆山亿趣信息技术研究院有限公司 | Dual-frequency antenna structure and antenna system |
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101740852A (en) * | 2008-11-05 | 2010-06-16 | 启碁科技股份有限公司 | broadband planar antenna |
| TW201027837A (en) * | 2009-01-10 | 2010-07-16 | Yageo Corp | A dual-band inverted-F antenna |
| CN102629708A (en) * | 2011-12-27 | 2012-08-08 | 广西工学院 | WIFI (wireless fidelity) mobile terminal plane antenna |
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| CN108550980A (en) * | 2018-05-31 | 2018-09-18 | 北京邮电大学 | Load the dual-frequency base station antenna and its radiation mode control method of Fresnel Lenses |
| CN210838096U (en) * | 2019-12-06 | 2020-06-23 | 昆山亿趣信息技术研究院有限公司 | Dual-frequency antenna structure and antenna system |
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