CN102570019B - Surface-mounted radio-frequency antenna unit supporting double frequency and corresponding radio-frequency antenna system - Google Patents
Surface-mounted radio-frequency antenna unit supporting double frequency and corresponding radio-frequency antenna system Download PDFInfo
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Abstract
The invention relates to a surface-mounted radio-frequency antenna unit supporting double frequency. The surface-mounted radio-frequency antenna comprises a top-layer metal sheet, an upper-layer dielectric slab, a middle-layer metal sheet, a lower-layer dielectric slab and a bottom-layer metal sheet, wherein the middle-layer metal sheet is provided with a ring gap, the top-layer metal sheet is arranged at a position above partial ring gap, and the bottom-layer metal sheet is a microstrip line arranged at a position which is superposed with the top-layer metal sheet and is located below part of the ring gap. The invention further relates to a binary MIMO (Multiple Input Multiple Output) radio-frequency antenna system, which comprises two radio-frequency antenna units which are connected side by side and respectively serve as a first signal transceiving end and a second signal transceiving end. With respect to an MIMO antenna adopting the surface-mounted radio-frequency antenna unit and the radio-frequency antenna system, disclosed by the invention, the gains of the two antenna units of the MIMO antenna in two frequency bands of 2.4GHz and 5GHz are respectively more than 4.1dB and 6.7dB, and thus, the surface-mounted radio-frequency antenna unit supporting the double frequency and the radio-frequency antenna system are provided, which are simple in structure, low in cost, smaller in size and applicable to a WLAN (Wireless Local Area Network).
Description
Technical field
The present invention relates to technical field of radio, particularly antenna technical field, specifically refer to the patch radio-frequency antenna unit and corresponding RF antenna systems of supporting double frequency.
Background technology
At present MIMO algorithm development is broadly divided into for MIMO (Multiple-Input Multiple-Output, the multiple-input, multiple-output) communication technology, MIMO is wireless modeling and multiple antenna design three main aspects.
The signal that multiple antennas sends mixes through beyond-the-horizon communication in wireless channel, again after receiving end multiple antennas receives, system is separated by space time processing algorithm and recovers transmitting data, its performance depends on the degree of independence of each antenna element Received signal strength, i.e. correlation, and correlation between multiple antennas and beyond-the-horizon communication and antenna performance closely related.Meanwhile, the mutual interference caused by mutual coupling between multiple antennas generally very difficult Baseband algorithms and signal processing technology solves.Therefore, the high-performance realizing mimo system, except the richness depending on multipath transmisstion, also depends on the appropriate design of multi-antenna-unit.For spatial domain, experiment shows, because beyond-the-horizon communication environment is different, provides the antenna element separation required for the low relevant fading signal in space also different.Such as, the macrocell environment of remote districts may need several wavelength intervals could obtain antenna decorrelation, and the indoor environment enriching scattering may only need half wavelength spacing.Can, for polarizing field, can the cross polarization degree of coupling determines provide polarization diversity, maybe provide the parallel channel of nearly orthogonal.Therefore, the design of MIMO multiple antennas is closely related with the installation site of communication environments and antenna.
Recent domestic has done some researchs for mimo antenna design, mainly contains following correlation technique content:
【1】Azremi A.A.H.，Kyro，M.，Ilvonen，J.Five-element inverted-F antenna array for MIMO communications and radio direction finding on mobile terminal 2009 Loughborough Antennas &Propagation Conference，2009，557-560。
【2】Saou-Wen Su，Jui-Hung Chou.Internal Wideband Monopole Antenna for MIMO Access-point Applications.2008 Antennas and Propagation Society International Symposium.2008，1-4。
【3】Chi-Yuk Chiu，Jie-Bang Yan，Murch R.D.Compact Three-Port Orthogonally Polarized MIMO Antennas.IEEE Antennas and Wireless Propagation Letters.2007，(6)：619-622
【4】Sarrazin J.，Mahe Y.，Avrillon S.Investigation on Cavity/Slot Antennas for Diversityand MIMO Systems：The Example of a Three-Port Antenna.IEEE Antennas and Wireless Propagation Letters.2008，(7)：414-417。
In space diversity and angle diversity antenna array design, document [1] the IFA antenna of five standards forms a MIMO battle array, in order to reduce the mutual coupling between antenna element, five antenna elements are divided into three groups by it, be placed on three edges on floor respectively, strengthen antenna element distance to reach the object of decorrelation as far as possible.Meanwhile, two IFA antennas with limit adopt the form of " back-to-back " to place (both short circuit arms are adjacent, and radiation arm opening is reverse).The modes of emplacement of this " back-to-back " brings angle diversity to a certain extent.The placement form of this " back-to-back " has been carried out certain improvement by document [2], 3 antenna elements are placed in a circular face by it, angle between three antenna elements is 120 °, the short circuit arm of three antennas is all towards circle centre position, thus the angle diversity formed to a certain extent, the mutual coupling between each antenna element is all less than-20dB.In entirety, adopt space diversity and angle diversity can obtain better decorrelation performance and obtain better diversity gain simultaneously, be widely used in MIMO design in recent years.But the maximum problem of these class methods is that mimo antenna volume is usually comparatively large, is unfavorable for that Total Product designs.
Consider bulk factor, researcher introduces multi-pole antennas in mimo antenna design both at home and abroad at present.Document [3] [4] devise the multi-polarization antenna of a series of three-dimensional, and they are based on linearly polarized radiation unit, then multiple duplicate radiation source are carried out three-dimensional orthogonal arrangement cleverly and place, thus realize multipolarization diversity.Its Literature [3] incorporates angle diversity design while realizing polarization diversity, thus makes the mutual coupling between each radiation element lower.But the multi-polarization antenna of this three-dimensional structure is extremely difficult to install, in Practical Project, using value is little.
In addition, from current domestic and international mimo antenna design, the research & design mainly focused mostly in mobile base station and mobile terminal, the mimo antenna design comparison be applied on WLAN is rare.
Summary of the invention
The object of the invention is to overcome above-mentioned shortcoming of the prior art, there is provided a kind of and support 2.4-2.484GHz and 5.15-5.825GHz two frequency ranges, the MIMO communication of at least 2T2R can also be supported simultaneously, and structure is simple, with low cost, small volume, is applicable to the patch radio-frequency antenna unit of the support double frequency of WLAN and corresponding RF antenna systems.
In order to realize above-mentioned object, the patch radio-frequency antenna unit of support double frequency of the present invention has following formation:
This radio frequency antenna element comprises the top-level metallic sheet of fitting successively from top to bottom, top dielectric plate, middle layer metal sheet, layer dielectric plate and underlying metal sheet, described top dielectric plate, the overall dimension of middle layer metal sheet and layer dielectric plate matches, described middle layer metal sheet offers annular slot, the center of circle of described annular slot is the center of this patch radio-frequency antenna unit, described top-level metallic sheet departs from the center of described patch radio-frequency antenna unit and the position be arranged at above the annular slot described in part, described underlying metal sheet is the microstrip line of terminal open circuit, described microstrip line is arranged at the position below the described partial circle gap overlapped with top-level metallic sheet, this microstrip line as feeder line to described annular slot feed, and by described annular slot to described top-level metallic sheet couple feed.
This can support in the patch radio-frequency antenna unit of double frequency, and the overall dimension of described top dielectric plate, middle layer metal sheet and layer dielectric plate is the square overlapped, and the center of circle of described annular slot is this foursquare center.
This can support in the patch radio-frequency antenna unit of double frequency, and the profile of described top-level metallic sheet is square, and the length of side of this top-level metallic sheet is less than the long half of described top dielectric edges of boards.
This can support in the patch radio-frequency antenna unit of double frequency, described underlying metal sheet is rectangle, one end of the length direction of described rectangle underlying metal sheet is positioned at the edge of described layer dielectric plate, and the other end in this rectangle underlying metal leaf length direction extends to corresponding in described annular slot and the position be positioned at below described top-level metallic sheet.
This can support in the patch radio-frequency antenna unit of double frequency, and the characteristic impedance of described underlying metal sheet is 50 ohm.
This can support in the patch radio-frequency antenna unit of double frequency, and the length of side of described top dielectric plate, middle layer metal sheet and layer dielectric plate is 70mm; The internal diameter of described annular slot is 14.3mm, and its external diameter is 15.8mm; The length of side of described top-level metallic sheet is 10mm; The center of this top-level metallic sheet and the distance at described top dielectric plate center are 14mm; The length of described underlying metal sheet is 26.4mm, and its width is 2.2mm; Described top dielectric plate is the foam medium plate of dielectric constant 1.01, and it is highly 4.2mm; Described layer dielectric plate is the PTFE medium plate of dielectric constant 2.55, and it is highly 0.8mm.
The present invention also provides a kind of binary multiple-input, multiple-output RF antenna systems be applied in WLAN (wireless local area network), this antenna system comprises two antenna elements being respectively the first signal transmitting and receiving end and secondary signal sending and receiving end be connected side by side, and described antenna element is above-mentioned radio frequency antenna element.
This is applied in the binary multiple-input, multiple-output RF antenna systems in WLAN (wireless local area network), and the angle between the direction of the direction of the underlying metal sheet of the first described signal transmitting and receiving end and the underlying metal sheet of described secondary signal sending and receiving end is 90 degree.
This is applied in the binary multiple-input, multiple-output RF antenna systems in WLAN (wireless local area network), and the center distance of two described radio frequency antenna element is 38mm, and the distance between the top-level metallic sheet of two described radio frequency antenna element is 54mm.
The radio frequency antenna element that have employed this invention comprises top-level metallic sheet, top dielectric plate, middle layer metal sheet, layer dielectric plate and the underlying metal sheet of fitting successively from top to bottom.Middle layer metal sheet offers annular slot, the center of circle of annular slot is the center of this patch radio-frequency antenna unit, top-level metallic sheet departs from the center of described patch radio-frequency antenna unit and the position be arranged at above the annular slot described in part, underlying metal sheet is the microstrip line of terminal open circuit, this microstrip line is arranged at the position below the partial circle gap that overlaps with top-level metallic sheet, and as feeder line to described annular slot feed, pass through described annular slot to described top-level metallic sheet couple feed simultaneously.Make and each antenna element of mimo antenna of two these radio frequency antenna element composition is greater than 4.1dB and 6.7dB respectively in the gain of 2.4GHz and 5GHz two frequency bands, the mutual coupling simultaneously between each feed port is less than-20dB, to reach low correlation.Thus provide a kind of structure simple, and with low cost, small volume, and be applicable to WLAN, support the patch radio-frequency antenna unit of double frequency and corresponding RF antenna systems.
Accompanying drawing explanation
Fig. 1 is the Rotating fields schematic diagram can supporting the patch radio-frequency antenna unit of double frequency of the present invention.
Fig. 2 is the profile that each laminating of the patch radio-frequency antenna unit of double frequency closes of can supporting of the present invention.
Fig. 3 is the vertical view can supporting the patch radio-frequency antenna unit of double frequency of the present invention.
Fig. 4 is the upward view can supporting the patch radio-frequency antenna unit of double frequency of the present invention.
Fig. 5 is the structural representation of the binary multiple-input, multiple-output RF antenna systems be applied in WLAN (wireless local area network) of the present invention.
Fig. 6 is the S parameter schematic diagram in actual applications of binary multiple-input, multiple-output RF antenna systems of the present invention.
Fig. 7 is the coefficient correlation result in actual applications of binary multiple-input, multiple-output RF antenna systems of the present invention.
Fig. 8 is dual-band antenna unit of the present invention gain results schematic diagram in actual applications.
Fig. 9 is scheming in the three dimensional field shape of 2.44GHz frequency range center frequency point in actual applications of binary multiple-input, multiple-output RF antenna systems of the present invention.
Figure 10 is scheming in the three dimensional field shape of 5.5GHz frequency range center frequency point in actual applications of binary multiple-input, multiple-output RF antenna systems of the present invention.
Figure 11 be binary multiple-input, multiple-output RF antenna systems of the present invention be applied to the schematic network structure in WLAN (wireless local area network).
Embodiment
In order to more clearly understand technology contents of the present invention, describe in detail especially exemplified by following examples.
Referring to shown in Fig. 1, is the Rotating fields schematic diagram can supporting the patch radio-frequency antenna unit of double frequency of the present invention.
In one embodiment, as shown in Figures 1 to 4, this top-level metallic sheet 1, top dielectric plate 2, middle layer metal sheet 3, layer dielectric plate 4 and the underlying metal sheet 5 patch radio-frequency antenna unit of double frequency can being supported to comprise fit successively from top to bottom.The overall dimension of wherein said top dielectric plate 2, middle layer metal sheet 3 and layer dielectric plate 4 matches, and is the square overlapped.Described middle layer metal sheet 3 offers annular slot 31, and the center of circle of described annular slot 31 is the center of this patch radio-frequency antenna unit, that is the center of described square top dielectric plate 2, middle layer metal sheet 3 and layer dielectric plate 4.Described top-level metallic sheet 1 is for departing from the center of described patch radio-frequency antenna unit and being arranged at the square-shaped metal sheet of annular slot 31 top position described in part, and the length of side of this square top-level metallic sheet 1 is less than the half of described top dielectric edges of boards long 2.Described underlying metal sheet 5 is the rectangle microstrip line of terminal open circuit, one end of the length direction of described rectangle underlying metal sheet 5 is positioned at the edge of described layer dielectric plate 4, the other end of this rectangle underlying metal sheet 5 length direction extends to corresponding in described the annular slot 31 and position be positioned at below described top-level metallic sheet 1, thus make this microstrip line 5 be arranged at position below the described partial circle gap 31 overlapped with top-level metallic sheet 1, this microstrip line 5 as feeder line to described annular slot 31 feed, and by described annular slot 31 to described top-level metallic sheet 1 couple feed.
In one more preferably execution mode, the characteristic impedance of described underlying metal sheet 5 is 50 ohm.
In the preferred execution mode of one, as shown in Figure 2,3, 4, the length of side L of described top dielectric plate 2, middle layer metal sheet 3 and layer dielectric plate 4 is 70mm; The internal diameter R1 of described annular slot 31 is 14.3mm, and its external diameter R2 is 15.8mm; The length of side P of described top-level metallic sheet 1 is 10mm; The distance A at the center of this top-level metallic sheet 1 and the center of described top dielectric plate 2 is 14mm; The length fy of described underlying metal sheet 5 is 26.4mm, and its width fx is 2.2mm; Described top dielectric plate 2 is the foam medium plate of dielectric constant 1.01, and its height h1 is 4.2mm; Described layer dielectric plate 4 is the PTFE medium plate of dielectric constant 2.55, and its height h2 is 0.8mm.
The present invention also provides a kind of binary multiple-input, multiple-output RF antenna systems be applied in WLAN (wireless local area network), in one embodiment, as shown in Figure 5, described antenna system comprises two antenna elements being respectively the first signal transmitting and receiving end Port1 and secondary signal sending and receiving end Port2 be connected side by side, and described antenna element is radio frequency antenna element mentioned above.Wherein, the angle between the direction of the direction of the underlying metal sheet 51 of the first described signal transmitting and receiving end Port1 and the underlying metal sheet 52 of described secondary signal sending and receiving end Port2 is 90 degree.
In a preferred embodiment, as shown in Figure 5, the center distance D of two described radio frequency antenna element is 38mm, and the distance d between the top-level metallic sheet 11 and 12 of two described radio frequency antenna element is 54mm.
In an application of the invention, radio frequency antenna element of the present invention is replaced to superpose with three-layer metal face by two layer medium plate and forms, and the thickness of upper and lower two layer medium plate is respectively h1 and h2, and relative dielectric constant is respectively ε r1 and ε r2.In square outside antenna, the length of side is L.Top-level metallic paster is square, and the length of side is P, and the centre distance of this paster center and whole antenna is A.Annular slot is opened in face to middle layer metal, and its internal-and external diameter is respectively R1 and R2, the center superposition of its center of circle and whole antenna.Underlying metal face is the microstrip line of terminal open circuit, and its length and width are respectively fy and fx.This microstrip line as feeder line, not only to the annular slot feed on intermediate metal layer, but also can through gap, to top layer square patch couple feed.For top layer of patches, that section be in annular slot immediately below it forms aperture-coupled to it jointly with bottom microstrip line.The characteristic impedance of feeder line is 50 ohm, depends on ε r2 and fx.Meanwhile, in order to increase the bandwidth of 5G frequency range, h1 increases to adopting while 4.2mm relative dielectric constant to be only the foam of 1.01 as top dielectric plate by radio frequency antenna element of the present invention.Layer dielectric plate employing relative dielectric constant is polytetrafluoroethylene (F4BM-2) material of 2.55, and dielectric loss angle tangent is less than 0.001.Obtain shown in structure numerical value following table 1 after debugging is optimized:
| h1 | h2 | εr1 | εr2 | L | P | R1 | R2 | fx | fy | A |
| 4.2mm | 0.8mm | 1.01 | 2.55 | 70mm | 10mm | 14.3mm | 15.8mm | 2.2mm | 26.4mm | 14mm |
Table 1 radio frequency antenna element parameter list
Adopt dual-band antenna of the present invention as the binary mimo antenna of Unit Design, as shown in Figure 5, in figure, D is two antenna element center distance, and d is the center distance of top-level metallic paster.Repeatedly optimized by emulation, finally get D=38 millimeter.
The S parameter of this double frequency binary mimo antenna is obtained as shown in Figure 6 when D=38 millimeter.S11 and S22 overlaps substantially completely, is all less than-10dB at 2.35-2.55GHz and 5.08-5.87GHz, and the S12 in resonance band remains on below-23dB.Fig. 7 is the coefficient correlation calculated according to S parameter.Coefficient correlation in two frequency ranges all remains on less than 0.001, and the receiving and transmitting signal on two ports is separate.Now produce the annular slot center distance D=38mm of 2.4G frequency range, be equivalent to 0.3 times of wavelength (for the wavelength of 2.4GHz); The center distance d=54mm of top-level metallic paster, is equivalent to 0.92 times of wavelength (for the wavelength of 5.15GHz).
Now each antenna element of this binary mimo antenna of the present invention is greater than 4.1dB and 6.7dB respectively in the gain of 2.4GHz and 5GHz two frequency bands.As shown in Figure 8, in 5G frequency range, frequency is higher, and gain is higher, can reach more than 9.3dB.The three dimensional field shape figure of 2.44GHz frequency range and 5.5GHz frequency range center frequency point respectively as shown in Figure 9, Figure 10.
As shown in figure 11, the schematic network structure in WLAN (wireless local area network) is being applied to for binary multiple-input, multiple-output RF antenna systems of the present invention.Mimo antenna of the present invention uses the spacing wave of wireless connections between local side and terminal in a wireless local area network to send and receives link.
The process of data is sent for local side.Wireless local side is by WIFI (wireless fidelity, Wireless Fidelity) BB (baseband, base band)/MAC (Media Access Control, hardware address) the module data encoding that will send, add agreement, packing etc., and be transferred to WIFI RF module.WIFI RF module is modulated data and is transferred to double frequency WIFI PA (Power Amplifier, power amplifier).Double frequency WIFI PA carries out prosperity to signal, increases transmitting power.Eventually through the binary mimo antenna in present patent application to radiation in free space.Wireless terminal accepts the wireless signal in free space by the binary mimo antenna in present patent application and is transferred to WIFI PA.Double frequency WIFI PA carries out signal filtering, shaping and amplification to signal, and by the Signal transmissions of acceptance to WIFI RF module.WIFI RF module is carried out demodulation to data and is transferred to the BB/MAC module of WIFI.The data decode that the BB/MAC module of WIFI will accept, the operation such as to unpack, finally can reply out data.The process that local side accepts data is only the reverse of said process, and wherein each module also can select various chips according to actual needs, therefore repeats no more.
The radio frequency antenna element that have employed this invention comprises top-level metallic sheet, top dielectric plate, middle layer metal sheet, layer dielectric plate and the underlying metal sheet of fitting successively from top to bottom.Middle layer metal sheet offers annular slot, the center of circle of annular slot is the center of this patch radio-frequency antenna unit, top-level metallic sheet departs from the center of described patch radio-frequency antenna unit and the position be arranged at above the annular slot described in part, underlying metal sheet is the microstrip line of terminal open circuit, this microstrip line is arranged at the position below the partial circle gap that overlaps with top-level metallic sheet, and as feeder line to described annular slot feed, pass through described annular slot to described top-level metallic sheet couple feed simultaneously.Make and each antenna element of mimo antenna of two these radio frequency antenna element composition is greater than 4.1dB and 6.7dB respectively in the gain of 2.4GHz and 5GHz two frequency bands, the mutual coupling simultaneously between each feed port is less than-20dB, to reach low correlation.Thus provide a kind of structure simple, and with low cost, small volume, and be applicable to WLAN, support the patch radio-frequency antenna unit of double frequency and corresponding RF antenna systems.
In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (6)
1. can support the patch radio-frequency antenna unit of double frequency for one kind, it is characterized in that, described radio frequency antenna element comprises the top-level metallic sheet of fitting successively from top to bottom, top dielectric plate, middle layer metal sheet, layer dielectric plate and underlying metal sheet, described top dielectric plate, the overall dimension of middle layer metal sheet and layer dielectric plate matches, described middle layer metal sheet offers annular slot, the center of circle of described annular slot is the center of this patch radio-frequency antenna unit, described top-level metallic sheet departs from the center of described patch radio-frequency antenna unit and the position be arranged at above the annular slot described in part, described underlying metal sheet is the microstrip line of terminal open circuit, described microstrip line is arranged at the position below the described partial circle gap overlapped with top-level metallic sheet, this microstrip line as feeder line to described annular slot feed, and by described annular slot to described top-level metallic sheet couple feed,
The overall dimension of described top dielectric plate, middle layer metal sheet and layer dielectric plate is the square overlapped, and the center of circle of described annular slot is this foursquare center,
The profile of described top-level metallic sheet is square, and the length of side of this top-level metallic sheet is less than the long half of described top dielectric edges of boards,
Described underlying metal sheet is rectangle, one end of the length direction of described rectangle underlying metal sheet is positioned at the edge of described layer dielectric plate, and the other end in this rectangle underlying metal leaf length direction extends to corresponding in described annular slot and the position be positioned at below described top-level metallic sheet.
2. the patch radio-frequency antenna unit can supporting double frequency according to claim 1, is characterized in that, the characteristic impedance of described underlying metal sheet is 50 ohm.
3. the patch radio-frequency antenna unit can supporting double frequency according to claim 2, is characterized in that, the length of side of described top dielectric plate, middle layer metal sheet and layer dielectric plate is 70mm; The internal diameter of described annular slot is 14.3mm, and its external diameter is 15.8mm; The length of side of described top-level metallic sheet is 10mm; The center of this top-level metallic sheet and the distance at described top dielectric plate center are 14mm; The length of described underlying metal sheet is 26.4mm, and its width is 2.2mm; Described top dielectric plate is the foam medium plate of dielectric constant 1.01, and it is highly 4.2mm; Described layer dielectric plate is the PTFE medium plate of dielectric constant 2.55, and it is highly 0.8mm.
4. one kind is applied to the binary multiple-input, multiple-output RF antenna systems in WLAN (wireless local area network), it is characterized in that, described antenna system comprises two antenna elements being respectively the first signal transmitting and receiving end and secondary signal sending and receiving end be connected side by side, the radio frequency antenna element of described antenna element according to any one of claims 1 to 3.
5. the binary multiple-input, multiple-output RF antenna systems be applied in WLAN (wireless local area network) according to claim 4, it is characterized in that, the angle between the direction of the direction of the underlying metal sheet of the first described signal transmitting and receiving end and the underlying metal sheet of described secondary signal sending and receiving end is 90 degree.
6. the binary multiple-input, multiple-output RF antenna systems be applied in WLAN (wireless local area network) according to claim 5, it is characterized in that, the center distance of two described radio frequency antenna element is 38mm, and the distance between the top-level metallic sheet of two described radio frequency antenna element is 54mm.
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| CN102904071A (en) * | 2012-09-29 | 2013-01-30 | 西安空间无线电技术研究所 | A L-Band Tri-band Circularly Polarized Microstrip Antenna |
| CN103794878B (en) * | 2014-01-18 | 2016-08-17 | 中国计量学院 | Double layer substrate multiband paster antenna |
| CN104993233B (en) * | 2015-07-17 | 2018-01-30 | 中国科学院上海高等研究院 | High-isolation has radiation diversity characteristic microband paste mimo antenna |
| CN105633586B (en) * | 2016-03-04 | 2019-02-26 | 歌尔股份有限公司 | Antenna assembly and electronic equipment |
| CN107749515B (en) * | 2017-09-30 | 2019-06-07 | 北京科技大学 | A kind of millimeter wave double-frequency micro-strip antenna |
| CN110429380B (en) * | 2019-08-28 | 2020-09-29 | 榆林学院 | Shared two-unit microstrip MIMO antenna based on radiation structure for 5G applications |
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| CN101102012B (en) * | 2007-07-12 | 2011-04-13 | 上海交通大学 | Multi-layer three-dimension suspending unidirectional broadband circle polarized millimeter wave plane gap antenna |
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| CN102570019A (en) | 2012-07-11 |
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