CN102800955A - Time reversal sub wavelength array antenna for wireless communication - Google Patents
Time reversal sub wavelength array antenna for wireless communication Download PDFInfo
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- CN102800955A CN102800955A CN2012102912046A CN201210291204A CN102800955A CN 102800955 A CN102800955 A CN 102800955A CN 2012102912046 A CN2012102912046 A CN 2012102912046A CN 201210291204 A CN201210291204 A CN 201210291204A CN 102800955 A CN102800955 A CN 102800955A
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Abstract
The invention provides a time reversal sub wavelength array antenna for a wireless communication, which belongs to the technical field of antennas. The time reversal sub wavelength array antenna is formed by a plurality of same antenna units by stacking, wherein the distance between the two adjacent antenna units is less than 1/2 working wavelength gamma. A metal patch on the front face of a medium substrate comprises a peach-shaped radiation unit; the peach-shaped radiation unit comprises an isosceles triangle-shaped metal patch and a semi-elliptic metal patch; and 26 small peach-shaped holes are uniformly etched in the patches of the radiation unit. The radiation unit adopts a microstrip feed line with characteristic impedance of 50 ohms; and the semi-elliptic metal patch part is connected with the microstrip feed line by a trapezoidal transition microstrip line. The metal patch on the back face of the medium substrate is a metal floor; and 14 small semi-elliptic holes are symmetrically etched in the metal floor. The time reversal sub wavelength array antenna for the wireless communication, provided by the invention, is applied to time reversal time domain communication mobile terminals; and as a channel of each antenna unit is relatively independent, so that the interference from an adjacent channel is extremely low, and the higher data transmission rate and higher frequency spectrum utilization rate can be supported.
Description
Technical field
The invention belongs to antenna technical field, relate to the array antenna that a kind of antenna element spacing works in sub-wavelength, be specifically related to a kind of time reversal sub-wavelength array antenna that is used for wireless communication terminal.
Background technology
The message capacity and the traffic rate that improve GSM are the targets that mobile communication is pursued.Along with the continuous growth of individual business demand, portable terminal is faced with message capacity and traffic rate great demand in urgent need to be improved.The a plurality of antenna elements of design on portable terminal, increase wireless channel quantity independently and be future mobile communications improve the communication of mobile terminal performance main means it
According to traditional theory, obtain good space diversity gain and spatial reuse gain for making multiaerial system (array antenna), require the antenna element spacing to be not less than operation wavelength half.If in the confined space, make the antenna element spacing much smaller than half operation wavelength; To cause the coupling between the unit to increase; The correlation of the wireless channel that each antenna is corresponding improves greatly; Cause the message capacity and the traffic rate of mobile terminal system greatly to reduce, grievous injury communication quality, thereby lost the meaning of introducing multiaerial system.Although people have carried out many research to the antenna element miniaturization, because the size of mobile-terminal platform is limited, a plurality of antennas that are used for different channels are integrated in portable terminal, shared space is still bigger.
Increasingly mature along with time reversal technology utilizes the adaptive space of time reversal electromagnetic wave, time synchronized focus characteristics, can solve the insurmountable difficult problem of many conventional methods.Time reversal (Time Reversal) need be near information source the layout scattering object to constitute multipath channel.Transmitting receives through the time reversal mirror of being placed by the far field after the scattering object scattering (TRM), after the signal elapsed time inverting that receives, and emission again again.The signal of re-emissioning just can near implementation space and time focusing source point.1991; D.R.Jackson and D.R.Dowling deliver the article (J.Acoust.Soc.Amer. that is entitled as " Phase conjugation in underwater acoustics "; Vol.89; Pp.171-181), given theoretical proof to the focus characteristics that time reversal is had in the literary composition under " scalar wave " transmission situation.2004; People such as G.lerosey deliver the article (Phys.Rev.Lett. that is entitled as " Time Reversal of electromagnetic waves "; Vol.92, pp.1939041), in the literary composition experimental verification first " time reversal electromagnetic wave " same tool focus characteristics at one's leisure.2007; People such as R.Carminati deliver article (the Optics Lett. that is entitled as " Theory of the time reversal cavity for electromagnetic fields "; Vol.32; Nov.2007), use dyadic Green's function that the focusing of time reversal " vector electromagnetic wave " is proved in the literary composition.Equally deliver the article (Science that is entitled as " Focusing beyond the diffraction limit with far-field time reversal " at " Science " people such as G.Lerosey in 2007; Vol.315; Pp.1119-1122; Feb.2007.), provided a kind of sub-wavelength array antenna in the literary composition, it constitutes around being enclosed in coaxial probe by the wire of random distribution.This array antenna binding time inverting electromagnetic wave is operated in 2.45GHz in the wire chamber of sealing, can show the super-resolution focus characteristics of 1/30 wavelength.These achievements also only limit to the experimental stage at present, and the bandwidth of time reversal array antenna also has much room for improvement, but it has tentatively showed the realizability of sub-wavelength super-resolution aerial array.
King in 2011 grasps medium people and has proposed " a kind of mobile radio terminal is with time inverting sub-wavelength array antenna " (number of patent application: 201110066620.1; Shen Qing Publication day: 2011.06.29; Inventor: Wang Bingzhong, Ge Guangding Zang Rui), can show far field sub-wavelength super-resolution focus characteristics equally.Compare the aerial array that proposed in " Science " article in 2007, this array is the unit with the plane single pole sub, and structure is comparatively compact; Be easy to design and integrated; Cell size (wide * height) size is 50mm * 55mm, and operating frequency range is 2.7 ~ 6.7GHz, impedance bandwidth (S
11Value less than-10dB or voltage standing wave ratio VSWR less than 2) be about 4GHz.But; Visible from this patent specification accompanying drawing 4; The sub-wavelength array antenna unit impedance bandwidth of its invention is little; Therefore the voltage standing wave ratio VSWR that is not all frequencies correspondences in 2.7 ~ 6.7GHz frequency range has limited the operating frequency scope of application of this array antenna to a certain extent less than 2.
The present invention is intended to based on the electromagnetic far field super-resolution rate of time reversal focus characteristics; Separate, the spacing of research channel is much smaller than the sub-wavelength micro-structural aerial array of wavelength, for the sub-wavelength micro-structural antenna array design that is used for the high-performance portable terminal provides best array structure, the method for designing of high-efficiency high-accuracy.
Summary of the invention
Spacing between effective reduced time inverting array antenna unit reduces array antenna occupation space volume, and the present invention provides a kind of radio communication with time inverting sub-wavelength array antenna.Each antenna element input port voltage standing wave ratio is less than 2 in this array antenna working band; The spacing of adjacent two array elements is less than 1/2 operation wavelength (wavelength calculates with centre frequency), has that volume is little, production cost is low, performance is good, be easy to integrated advantage.
Technical scheme of the present invention is:
A kind of radio communication is with time inverting sub-wavelength array antenna, and is as shown in Figure 1, cascaded by a plurality of identical antenna elements, and the spacing between adjacent two antenna elements is less than 1/2 operation wavelength λ.Each antenna element comprises rectangle medium substrate and the metal patch that is positioned at rectangle medium substrate positive and negative like Fig. 2, shown in 3.
The front metal paster is as shown in Figure 2; Comprise a peach shape radiating element; Said peach shape radiating element is formed by connecting an isosceles triangle metal patch and a half elliptic metal patch, wherein the base equal in length of the major axis of half elliptic metal patch and isosceles triangle metal patch and overlapping; On peach shape radiating element, evenly be etched with 26 peach shape apertures from top to bottom, wherein the shape of peach shape aperture is similar but in the opposite direction with whole peach shape radiating element shape; The trapezoidal transition microstrip line that the minor axis lower end of half elliptic metal patch broadens through one section width gradually in the peach shape radiating element and one section characteristic impedance are that 50 ohm microstrip feed line links to each other, and characteristic impedance is that 50 ohm microstrip feed line end is positioned at rectangle medium substrate minor face center.
The back metal paster is metal floor, and is as shown in Figure 3, is shaped as half elliptic; The half elliptic metal floor is that 50 ohm microstrip feed line is corresponding in the positive position of rectangle medium substrate in the position at the rectangle medium substrate back side with characteristic impedance; The major axis of half elliptic metal floor equates with the width of rectangle medium substrate and overlaps with a broadside of rectangle medium substrate, and the height of half elliptic metal floor is the total length that 50 ohm microstrip feed line adds the trapezoidal transition microstrip line less than characteristic impedance; Regional left and right symmetrically near the elliptic arc edge on the half elliptic metal floor is etched with 14 half elliptic apertures, and wherein the shape of half elliptic aperture is similar but in the opposite direction with whole half elliptic metal floor shape.
The present invention according to the time reversal electromagnetic wave in coupling between the high density arrays antenna element and near the resonance characteristic the unit; Realization has the integrated sub-wavelength array antenna of high density of high spatial resolution; A kind of effective solution of on the limited portable terminal in space, realizing high density multiaerial system integration problem has been proposed; Explore the method for designing of many antenna integrated systems of the spatial super-resolution characteristic in the high-performance mobile radio communication of new generation, with performances such as the spatial reuse gain that improves multiaerial system and space diversity gains.Compare with existing mobile terminal antenna system; This sub-wavelength array antenna can be supported higher data transmission rate, the higher availability of frequency spectrum, higher Information Security and greater flexibility, has improved communications of Mobile Terminals capacity and traffic rate to a great extent.
Although the spacing between the sub-wavelength array antenna unit less than in addition much smaller than half wavelength, binding time inverting electromagnetic wave has the spatial super-resolution characteristic, can greatly suppress the mutual coupling between the point blank antenna.In the limited space of multi-antenna wireless mobile terminal communication system platform, the number of unit in the array antenna is compared the traditional antenna number of unit and is expanded rapidly, and then makes traffic rate, message capacity improve rapidly.When the present invention is applied in practical communication, need not carry out complex processing to signal, only be simple inversion procedure, promptly can show the super-resolution characteristic, and it is convenient that whole process implements, and is easy to Project Realization.
It may be noted that especially since the time reversal electromagnetic wave with its adaptive space, time focus characteristics, abundant at multipath, under the complicated situation, focusing effect is good more for environment.The sub-wavelength multi-antenna array that the present invention designed; Have very strong flexibly; Can in various complex environments, (comprise mountain area, river, forest, city and suburb); More can make full use of the multipath of signal in the complex environment, utilize coupling and particular resonance characteristic between the antenna element, be more conducive in complex environment, carry out the communication of two-forty, big capacity, high reliability and high security.
In sum; In the domain communication system portable terminal, utilize the time reversal technology when the present invention is applied in, directly time-domain signal is carried out inversion procedure; Make that each channel keeps relatively independent in the multiaerial system; Mutual coupling is very little, and monkey chatter is extremely low, can support higher data transmission rate, the higher availability of frequency spectrum, higher Information Security and greater flexibility; Improve communications of Mobile Terminals capacity and traffic rate to a great extent, and then guaranteed the communication quality in many antennas, the high capacity communication process.
Description of drawings
Fig. 1 is an array antenna structure sketch map provided by the invention.
Fig. 2 is the antenna unit structure front schematic view and the size marking of array antenna provided by the invention.
Fig. 3 is the antenna unit structure schematic rear view and the size marking of array antenna provided by the invention.
Fig. 4 is the simulation result of array antenna unit structure input port voltage standing wave ratio provided by the invention.
Fig. 5 is the far-field radiation Direction Pattern Simulation result of antenna element under the 4GHz frequency of array antenna provided by the invention.
Fig. 6 is the far-field radiation Direction Pattern Simulation result of antenna element under the 5.5GHz frequency of array antenna provided by the invention.
Fig. 7 is the far-field radiation Direction Pattern Simulation result of antenna element under the 6GHz frequency of array antenna provided by the invention.
Fig. 8 is an array antenna array super-resolution test result provided by the invention.
Embodiment
A kind of radio communication is with time inverting sub-wavelength array antenna, and is as shown in Figure 1, cascaded by a plurality of identical antenna elements, and the spacing between adjacent two antenna elements is less than 1/2 operation wavelength λ.Each antenna element comprises rectangle medium substrate and the metal patch that is positioned at rectangle medium substrate positive and negative like Fig. 2, shown in 3.
The front metal paster is as shown in Figure 2; Comprise a peach shape radiating element; Said peach shape radiating element is formed by connecting an isosceles triangle metal patch and a half elliptic metal patch, wherein the base equal in length of the major axis of half elliptic metal patch and isosceles triangle metal patch and overlapping; On peach shape radiating element, evenly be etched with 26 peach shape apertures from top to bottom, wherein the shape of peach shape aperture is similar but in the opposite direction with whole peach shape radiating element shape; The trapezoidal transition microstrip line that the minor axis lower end of half elliptic metal patch broadens through one section width gradually in the peach shape radiating element and one section characteristic impedance are that 50 ohm microstrip feed line links to each other, and characteristic impedance is that 50 ohm microstrip feed line end is positioned at rectangle medium substrate minor face center.
The back metal paster is metal floor, and is as shown in Figure 3, is shaped as half elliptic; The half elliptic metal floor is that 50 ohm microstrip feed line is corresponding in the positive position of rectangle medium substrate in the position at the rectangle medium substrate back side with characteristic impedance; The major axis of half elliptic metal floor equates with the width of rectangle medium substrate and overlaps with a broadside of rectangle medium substrate, and the height of half elliptic metal floor is the total length that 50 ohm microstrip feed line adds the trapezoidal transition microstrip line less than characteristic impedance; Regional left and right symmetrically near the elliptic arc edge on the half elliptic metal floor is etched with 14 half elliptic apertures, and wherein the shape of half elliptic aperture is similar but in the opposite direction with whole half elliptic metal floor shape.
The span of said dielectric substrate thickness is between 1/20 ~ 1/2 operation wavelength, and relative dielectric constant is 2.2, and loss angle tangent is 0.001.
Need to prove that Fig. 2 and Fig. 3 have just provided a kind of embodiment, be proof, and be not to be further qualification of the present invention to technique effect of the present invention.The description of those skilled in the art's technical scheme according to the present invention should confirm that the present invention has more multiclass like implementation.
Said peach shape aperture is that 1.6mm, minor axis are the semiellipse of 1.2mm by major axis and highly is that the isosceles triangle of 0.8mm is spliced that the base of isosceles triangle overlaps with semielliptical major axis; The major axis of said half elliptic aperture is that 2.0mm, minor axis are 1.6mm.
As shown in Figure 2: the long 35mm of rectangle medium substrate, wide 33mm, thick 0.5mm, dielectric substrate relative dielectric constant are 2.2, and loss angle tangent is 0.001; Characteristic impedance is the long 10mm of 50 ohm microstrip feed line, wide 1.6mm, the long 2.75mm of trapezoidal transition microstrip line, and width is incremented to 1.6mm gradually by 0.97mm; The semiellipse paster major axis of peach shape radiating element is that 21mm, minor axis are 12mm, and isosceles triangle paster base overlaps with the semiellipse major axis, and height is 12mm; Even 26 peach shapes of etching aperture on peach shape radiating element paster; Direction is opposite with peach shape radiating element; Peach shape aperture is that 1.6mm, minor axis are the semiellipse of 1.2mm by major axis and highly is that the isosceles triangle of 0.8mm is spliced; The base of isosceles triangle overlaps with semielliptical major axis, and 26 peach shape apertures are divided into 7 rows, and the 1st drains into the 7th row peach shape aperture number is followed successively by 1,2,3,4,5,6,5.
Half elliptic metal floor major axis is that 33mm, minor axis are 25mm; Elliptic arc edge, paster upper edge left and right symmetrically is etched with 14 half elliptic apertures; Direction is opposite with the half elliptic metal floor, and the major axis of half elliptic aperture is that 2.0mm, minor axis are 1.6mm, is parallel to semiellipse floor long axis direction and is arranged in order five rows; Vertical interval is followed successively by 1.5mm, 2mm, 2mm, 2mm, is followed successively by 4mm, 4mm, 3mm in minor axis adjacent aperture level interval on one side.
Voltage standing wave ratio and the far-field radiation directional characteristic of above-mentioned antenna array unit in the 2GHz-10GHz frequency range seen Fig. 4, Fig. 5, Fig. 6 and Fig. 7.
Fig. 4 has provided the feed port voltage standing wave ratio, in the bandwidth of 3.19-10GHz, satisfies voltage standing wave ratio all below 2.
Fig. 5 has provided antenna element under the 4GHz frequency, the direction of an electric field figure of E face.
Fig. 6 has provided antenna element under the 5.5GHz frequency, the direction of an electric field figure of E face.
Fig. 7 has provided antenna element under the 6GHz frequency, the direction of an electric field figure of E face.
As shown in Figure 1,4 antenna elements are formed array, and put on the antenna surface opposite, and spacing all can show the focus characteristics of super-resolution less than half wavelength up to 1/40 wavelength.Fig. 8 has provided aerial array, the super-resolution characteristic that the binding time inversion technique shows.The definition antenna element is followed successively by antenna element from top to bottom 1,2,3, No. 4.With No. 2 antennas is example, when No. 2 antenna transmission signals, after TRM extracts its channel characteristics, sends once more, and the signal amplitude of having only No. 2 antenna elements to receive is maximum, and the signal amplitude that other antenna receives is half the less than No. 2 antennas all.This means that during communication, No. 2 antennas are independently channels, No. 2 antenna is very little to the interference of other antenna.And other antenna is when communication; Also be to have the status that is equal to No. 2 antennas; Each antenna is represented a separate channel, and other antenna is all had very little interference, can utilize the time reversal technology to carry out two-forty, high-quality multi-antenna communication very easily.
With the patent of invention of the having applied for (number of patent application: 201110066620.1) compare described in the background technology; The antenna element size is merely 33mm * 35mm in the patent of the present invention, and volume is littler, and impedance bandwidth is 6.81GHz; Bandwidth is wideer; Be 1.7 times of above-mentioned patent impedance bandwidth, the basic covering ultra wideband of the operating frequency of antenna scope of application (UWB) frequency range has stronger practical applications and is worth.Table 1 has been listed antenna element parameter comparison situation, wherein λ in patent of the present invention and the above-mentioned patent of invention of having applied for
LBe the pairing operation wavelength of antenna element low side operating frequency.
Antenna element parameter comparison in table 1 patent of the present invention and the patent of invention of having applied for
| λ L(mm) | Size (wide * height) | Operating frequency range/impedance bandwidth (GHz) | |
| The patent of invention of having applied for | 111 | 0.45λ L×0.50λ L | 2.7~6.7/4 |
| Patent of the present invention | 94 | 0.35λ L×0.37λ L | 3.19~10/6.81 |
Claims (3)
1. a radio communication is cascaded by a plurality of identical antenna elements with time inverting sub-wavelength array antenna, and the spacing between adjacent two antenna elements is less than 1/2 operation wavelength λ; Each antenna element comprises rectangle medium substrate and the metal patch that is positioned at rectangle medium substrate positive and negative;
The front metal paster comprises a peach shape radiating element; Said peach shape radiating element is formed by connecting an isosceles triangle metal patch and a half elliptic metal patch, wherein the base equal in length of the major axis of half elliptic metal patch and isosceles triangle metal patch and overlapping; On peach shape radiating element, evenly be etched with 26 peach shape apertures from top to bottom, wherein the shape of peach shape aperture is similar but in the opposite direction with whole peach shape radiating element shape; The trapezoidal transition microstrip line that the minor axis lower end of half elliptic metal patch broadens through one section width gradually in the peach shape radiating element and one section characteristic impedance are that 50 ohm microstrip feed line links to each other, and characteristic impedance is that 50 ohm microstrip feed line end is positioned at rectangle medium substrate minor face center;
The back metal paster is the half elliptic that is shaped as of metal floor; The half elliptic metal floor is that 50 ohm microstrip feed line is corresponding in the positive position of rectangle medium substrate in the position at the rectangle medium substrate back side with characteristic impedance; The major axis of half elliptic metal floor equates with the width of rectangle medium substrate and overlaps with a broadside of rectangle medium substrate, and the height of half elliptic metal floor is the total length that 50 ohm microstrip feed line adds the trapezoidal transition microstrip line less than characteristic impedance; Regional left and right symmetrically near the elliptic arc edge on the half elliptic metal floor is etched with 14 half elliptic apertures, and wherein the shape of half elliptic aperture is similar but in the opposite direction with whole half elliptic metal floor shape.
2. radio communication according to claim 1 is characterized in that with time inverting sub-wavelength array antenna the span of said dielectric substrate thickness is between 1/20 ~ 1/2 operation wavelength, and relative dielectric constant is 2.2, and loss angle tangent is 0.001.
3. radio communication according to claim 1 is characterized in that with time inverting sub-wavelength array antenna the long 35mm of rectangle medium substrate, wide 33mm, thick 0.5mm, dielectric substrate relative dielectric constant are 2.2, and loss angle tangent is 0.001; Characteristic impedance is the long 10mm of 50 ohm microstrip feed line, wide 1.6mm, the long 2.75mm of trapezoidal transition microstrip line, and width is incremented to 1.6mm gradually by 0.97mm; The semiellipse paster major axis of peach shape radiating element is that 21mm, minor axis are 12mm, and isosceles triangle paster base overlaps with the semiellipse major axis, and height is 12mm; Even 26 peach shapes of etching aperture on peach shape radiating element paster; Direction is opposite with peach shape radiating element; Peach shape aperture is that 1.6mm, minor axis are the semiellipse of 1.2mm by major axis and highly is that the isosceles triangle of 0.8mm is spliced; The base of isosceles triangle overlaps with semielliptical major axis, and 26 peach shape apertures are divided into 7 rows, and the 1st drains into the 7th row peach shape aperture number is followed successively by 1,2,3,4,5,6,5;
Half elliptic metal floor major axis is that 33mm, minor axis are 25mm; Elliptic arc edge, paster upper edge left and right symmetrically is etched with 14 half elliptic apertures; Direction is opposite with the half elliptic metal floor, and the major axis of half elliptic aperture is that 2.0mm, minor axis are 1.6mm, is parallel to semiellipse floor long axis direction and is arranged in order five rows; Vertical interval is followed successively by 1.5mm, 2mm, 2mm, 2mm, is followed successively by 4mm, 4mm, 3mm in minor axis adjacent aperture level interval on one side.
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| CN201210291204.6A CN102800955B (en) | 2012-08-16 | 2012-08-16 | A kind of radio communication time reversal sub-wavelength array antenna |
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| CN201210291204.6A CN102800955B (en) | 2012-08-16 | 2012-08-16 | A kind of radio communication time reversal sub-wavelength array antenna |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151617A (en) * | 2013-04-09 | 2013-06-12 | 电子科技大学 | High-gain low-sidelobe narrow-beam heart-shaped array antenna |
| CN107799884A (en) * | 2017-09-05 | 2018-03-13 | 西安电子科技大学 | Two-dimensional sub-wavelength array antenna and the Wireless Telecom Equipment of application, radar terminal |
| CN108879095A (en) * | 2018-07-09 | 2018-11-23 | 中国计量大学 | Spade microstrip with holes |
| CN110994152A (en) * | 2019-12-12 | 2020-04-10 | 中国汽车工程研究院股份有限公司 | Antenna module for simulating terminal radiation, and in-vehicle electromagnetic radiation testing system and method |
| CN112103630A (en) * | 2020-09-16 | 2020-12-18 | 辽宁工程技术大学 | Ultra-wideband antenna with double trap characteristics |
| CN115377690A (en) * | 2022-08-02 | 2022-11-22 | 电子科技大学 | Annular broadband circularly polarized on-chip antenna applied to millimeter wave vehicle-mounted radar |
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| CN201946758U (en) * | 2010-12-21 | 2011-08-24 | 电子科技大学 | Time reversal sub-wavelength array antenna for wireless mobile terminal |
| CN202695719U (en) * | 2012-08-16 | 2013-01-23 | 电子科技大学 | Time reversal subwavelength array antenna used for wireless communication |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151617A (en) * | 2013-04-09 | 2013-06-12 | 电子科技大学 | High-gain low-sidelobe narrow-beam heart-shaped array antenna |
| CN107799884A (en) * | 2017-09-05 | 2018-03-13 | 西安电子科技大学 | Two-dimensional sub-wavelength array antenna and the Wireless Telecom Equipment of application, radar terminal |
| CN108879095A (en) * | 2018-07-09 | 2018-11-23 | 中国计量大学 | Spade microstrip with holes |
| CN110994152A (en) * | 2019-12-12 | 2020-04-10 | 中国汽车工程研究院股份有限公司 | Antenna module for simulating terminal radiation, and in-vehicle electromagnetic radiation testing system and method |
| CN112103630A (en) * | 2020-09-16 | 2020-12-18 | 辽宁工程技术大学 | Ultra-wideband antenna with double trap characteristics |
| CN115377690A (en) * | 2022-08-02 | 2022-11-22 | 电子科技大学 | Annular broadband circularly polarized on-chip antenna applied to millimeter wave vehicle-mounted radar |
| CN115377690B (en) * | 2022-08-02 | 2024-04-30 | 电子科技大学 | Annular broadband circularly polarized on-chip antenna applied to millimeter wave vehicle-mounted radar |
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|---|---|
| CN102800955B (en) | 2015-07-29 |
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