CN114498079A - One-bit reconfigurable millimeter wave array antenna - Google Patents
One-bit reconfigurable millimeter wave array antenna Download PDFInfo
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- CN114498079A CN114498079A CN202210185988.8A CN202210185988A CN114498079A CN 114498079 A CN114498079 A CN 114498079A CN 202210185988 A CN202210185988 A CN 202210185988A CN 114498079 A CN114498079 A CN 114498079A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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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
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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
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
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Abstract
The invention provides a one-bit reconfigurable millimeter wave array antenna for a mobile terminal, which realizes the function of a random phase without grating lobes, and the antenna can be used not only in four-unit or single-polarization, but also in eight-unit or even more-unit or dual-polarization. The reconfigurable array antenna is composed of four reconfigurable one-bit microstrip patch antenna elements. Each patch antenna element is fed by a slot on the ground. The one-bit patch antenna realizes a-pi or 0 phase by selecting the feed direction of the microstrip line. The invention applies a fixed phase to mitigate the negative effects of one-bit phase quantization errors. The inventive array has an overlap of-10 dB impedance bandwidth in different beam directions up to 3GHz (25-28 GHz). In the frequency range of 26-28GHz, the array with fixed phase can control the phase range of the main beam to be-34-35 degrees under the condition of no grating lobe, and the control beam realizes the indexes of good array gain, side lobe level in the normal range and low cross polarization.
Description
Technical Field
The invention belongs to the technical field of communication equipment, relates to a millimeter wave array antenna, and particularly relates to a one-bit reconfigurable millimeter wave array antenna.
Background
In recent years, millimeter wave antennas for mobile terminals have made significant progress. However, for mobile terminals, cost and occupied space are two important factors for antenna design, and a millimeter wave array antenna with lower cost and smaller occupied space is always a target pursued by antenna engineers. In the published article of IEEE, a 60GHz mesh phased array antenna module is designed; a wide bandwidth compact four-mode millimeter wave array antenna having 8GHz (25-33 GHz); a capacitively coupled patch array antenna operating at 24-28GHz frequency with high antenna gain and wide beam coverage; a compact dual-polarized yagi array antenna with 23.5-28GHz coverage of magneto-plane; a vertically polarized fire terminated planar folded slot antenna; broadband millimeter wave dual-polarized terminal transmitting array antenna. The paper Integrated millimeter-wave wireless end-fire 5G beam antenna and low-frequency 4G LTE antenna in mobile terminals analyzes the effect of the metal frame on the millimeter wave antenna and suggests using grating strips and parasitic radiation patches to mitigate the negative effects. In the paper Co-designed mm-wave and LTE hand antennas, a rectangular window in a metal frame is used to mount a millimeter wave array antenna so that the millimeter wave array can radiate power directly through the rectangular window. This practical solution has been adopted by some commercial 5G mobile terminals, such as Apple iPhone 12 with a micrometric window. In addition, the millimeter wave array antenna can also be directly realized through a slot on a metal frame of the mobile terminal.
Although the millimeter wave array antenna developed above has excellent performance and can meet some requirements of 5G mobile terminals, it is usually necessary to add a phase shifter to control the beam direction. For an n-bit phase shifter, 2n available quantized phases may be provided, stepped by-2 π/2 n. Each element of the array may select the nearest available quantized phase to replace the desired phase. In the open literature, array antennas with five, four, three and two bit phase shifters are proposed, which arrays can direct the beam in the desired direction. However, in reality, the quantization phase of each cell is usually different from the desired phase, and phase quantization errors always occur.
Disclosure of Invention
The present invention is made to solve the above problems, and an object of the present invention is to provide a millimeter wave array antenna capable of achieving a reasonable beam steering performance without an additional phase shifter, thereby overcoming the influence caused by the reduction in size of a mobile phone antenna and the complicated electromagnetic environment in a mobile phone, and the present invention adopts the following technical scheme:
the invention provides a one-bit reconfigurable millimeter wave array antenna, which is characterized by comprising the following components: a plurality of antenna element is the array and arranges, constitutes a bit array, wherein, every antenna element includes radiating layer, antenna dielectric layer, metal ground, feed dielectric layer and the feeder layer that top-down stacked gradually the setting, the feeder groove has been seted up on the metal ground, be formed with feed transmission line on the feeder layer, the radiating layer passes through the feeder groove and feed transmission line and feed source turn-on connection, feed transmission line includes two diodes, is used for making the phase place of antenna element's radiation electric field only is first predetermined phase place or second predetermined phase place to realize the function that the no grating lobe of random phase place.
The one-bit reconfigurable millimeter wave array antenna provided by the invention can also have the technical characteristics that the first predetermined phase is 0, and the second predetermined phase is-pi.
The one-bit reconfigurable millimeter wave array antenna provided by the invention can also have the technical characteristics that the radiation layer is a rectangular metal radiation patch, the length of the radiation layer is 2.7mm, and the width of the radiation layer is 2.7 mm.
The one-bit reconfigurable millimeter wave array antenna provided by the invention can also have the technical characteristics that the length and the width of the metal ground are both 10mm, the rectangular groove is formed in the middle of the metal ground, and the length and the width of the rectangular groove are 2.3mm and 0.2mm respectively.
The one-bit reconfigurable millimeter wave array antenna provided by the invention can also have the technical characteristics, wherein the feeding transmission line comprises a DC transmission line L1, a DC transmission line L2, a feeding transmission line L3, a diode K1, a diode K2, a resistor R, a capacitor C and a metal cylinder CL1, one end of the resistor R is connected to a DC power supply, the other end of the resistor R is connected to one end of the DC transmission line L1, the other end of the dc transmission line L1 is connected to a feeding transmission line L3, the diode K1 and the diode K2 are connected in series in the feeding transmission line L3, the other end of the feed transmission line L3 is connected to both one end of the dc transmission line L2 and one end of the capacitor C, the other end of the capacitor C is connected to the power supply, and the other end of the DC transmission line L2 is grounded through the metal cylinder CL 1.
The one-bit reconfigurable millimeter wave array antenna provided by the invention can also have the technical characteristics that the diode K1 and the diode K2 are PIN diodes, and the models of the diodes are MA4AGFCP 910.
The one-bit reconfigurable millimeter wave array antenna provided by the invention can further have the technical characteristics that the feed transmission line further comprises a fan-shaped metal wire F1 connected to one end of the direct current transmission line L1 close to the resistor R.
The one-bit reconfigurable millimeter wave array antenna provided by the invention can also have the technical characteristics that the antenna dielectric layer is a Rogers RT5880 single-layer dielectric substrate, the relative dielectric constant of the antenna dielectric layer is 2.2, the loss tangent of the antenna dielectric layer is 0.0009, and the height of the antenna dielectric layer is 0.508 mm.
The one-bit reconfigurable millimeter wave array antenna provided by the invention can also have the technical characteristics that the feed dielectric layer is a Rogers RO4003C double-layer dielectric substrate, the relative dielectric constant of the feed dielectric layer is 3.55, the loss tangent is 0.0027, and the height is 0.203 mm.
Action and Effect of the invention
According to the one-bit reconfigurable millimeter wave array antenna, the plurality of antenna units are arranged in an array, so that the reconfigurable one-bit multi-unit array antenna is formed, each antenna unit feeds power through the feed slot on the metal ground and the corresponding feed transmission line, the feed transmission line comprises two diodes, and the phase of the radiation electric field of the corresponding antenna unit is limited to the first preset phase or the second preset phase, so that the negative influence caused by one-bit phase quantization error can be reduced, the ideal control on the direction and the performance of a wave beam can be realized under the condition of not adopting an additional phase shifter, the function of one-bit array random phase without grating lobes is realized, and the size of the array antenna is further reduced.
Drawings
Fig. 1 is a schematic structural diagram of a one-bit reconfigurable millimeter wave array antenna in the present embodiment;
fig. 2 is a structural diagram of an antenna unit in the present embodiment;
FIG. 3 is a view showing the structure of the antenna unit in different angles in the present embodiment;
fig. 4 is a schematic structural view of the feed network in the present embodiment;
FIG. 5 is an enlarged view of a portion of FIG. 4 within circle A;
fig. 6 is an equivalent circuit diagram when a high level is applied to the microstrip feed transmission line in the present embodiment;
fig. 7 is an equivalent circuit diagram when a low level is applied to the microstrip feed transmission line in the present embodiment;
fig. 8 is a schematic structural diagram of the power divider in this embodiment;
fig. 9 is a diagram of simulation results of S11 of the antenna unit of the one-bit reconfigurable millimeter wave array antenna in two states in the present embodiment;
fig. 10 is a diagram of main polarization and cross polarization of a one-bit reconfigurable millimeter wave array antenna in the present embodiment;
fig. 11 is a graph of array performance of the one-bit reconfigurable millimeter wave array antenna according to the present embodiment as a function of switching parameters;
fig. 12 is a simulation diagram of radiation directions of the one-bit reconfigurable millimeter wave array antenna in the embodiment in different desired beam directions.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following describes the one-bit reconfigurable millimeter wave array antenna of the invention in detail with reference to the embodiments and the accompanying drawings.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
< example >
The present embodiment provides a one-bit reconfigurable millimeter wave array antenna, which is provided in a mobile terminal such as a mobile phone and is used for transmitting and receiving signals.
Fig. 1 is a schematic structural diagram of a one-bit reconfigurable millimeter wave array antenna in the present embodiment.
As shown in fig. 1, a one-bit reconfigurable millimeter wave array antenna 10 (hereinafter referred to as an antenna 10) of the present embodiment includes four antenna units 11, and the four antenna units 11 are sequentially arranged along an X-axis direction in fig. 1 and are arranged in an array to form a one-bit multi-unit array. The "ports 1" to "ports 4" in fig. 1 are feed ports of the respective antenna elements 11.
Fig. 2 is a structural diagram of the antenna unit in the present embodiment.
Fig. 3 is a structural diagram of the antenna unit in this embodiment from different angles.
As shown in fig. 2 and 3, each antenna element 11 includes a radiation layer 111, an antenna dielectric layer 112, an adhesive layer 113, a metal ground 114, a feed dielectric layer 115, and a feed layer 116, which are stacked in this order from top to bottom.
The radiation layer 111 is a rectangular metal radiation patch arranged on the top of the antenna dielectric layer 112, and the length and the width of the patch are both 2.7 mm.
The antenna dielectric layer 112 is a rocky RT5880 single-layer dielectric substrate, and has a relative dielectric constant of 2.2, a loss tangent of 0.0009, and a height h1 of 0.508 mm.
The adhesive layer 113 is used to adhere the antenna dielectric layer 112, the feed dielectric layer 114, and the metal ground 11, and the height h3 of the adhesive layer 113 is 0.101 mm.
A metal ground 114 is provided on top of the feed dielectric layer 115, the length and width of the metal ground 114 being 10 mm. Rectangular channel 1141, also the feed groove is seted up at the middle part of metal ground 114 for feed, rectangular channel 1141's length is 2.3mm, and the width is 0.2 mm.
The feed dielectric layer 115 is a rogers RO4003CPCB double-layer dielectric substrate, and has a relative dielectric constant of 3.55, a loss tangent of 0.0027, and a height h2 of 0.203 mm.
A feed line layer 116 is disposed below feed dielectric layer 115, and a microstrip feed transmission line is formed on feed line layer 116.
Fig. 4 is a schematic structural diagram of the feed network in the present embodiment.
Fig. 5 is an enlarged view of a portion of fig. 4 within circle a.
As shown in fig. 4 and 5, the microstrip feed transmission line includes a dc transmission line L1, a dc transmission line L2, a feed transmission line L3, a sector metal line F1, diodes K1 and K2, a resistor R, a capacitor C, and short-circuit metal cylinders CL1 and CL2, which are connected to form a feed network in the manner shown in fig. 4 and 5, and the feed network isolates a dc current element from an ac current element. Specifically, one end of a resistor R is connected to a direct current power supply, the other end of the resistor R is connected to one end of a direct current transmission line L1, one end of a direct current transmission line L1 is connected to a feed transmission line L3, a diode K1 and a diode K2 are connected in series in a feed transmission line L3, the other end of the feed transmission line L3 is connected to both a direct current transmission line L2 and a capacitor C, the other end of the capacitor C is connected to the feed power supply, the other end of the direct current transmission line L2 is grounded through a short-circuit metal cylinder CL1, and a fan-shaped metal wire F1 is connected to one end of a direct current transmission line L1 close to the resistor R. The shorting metal cylinder CL2 is grounded. The dc transmission line L1, the dc transmission line L2, and the feeding transmission line L3 provide voltages to the two diodes K1 and K2. Diodes K1 and K2 are PIN diodes, each of the type MA4AGFCP910, which can be considered as two switches. The resistance value of the resistor R is 100 omega, and the capacitance value of the capacitor C is 3.3 pF.
In this embodiment, the dc power terminals V1 and V2 of each antenna unit 11 are connected to a dc controller, and the dc controller can provide three dc voltages of 0V, 1.5V and 3V for connecting to a dc reference line. Wherein, the voltage terminal of 1.5V of the DC controller is connected to each DC power terminal V2, and the voltage terminals of 0V and 3V are connected to each DC power terminal V1, so as to control the state of each PIN diode. Furthermore, in order to successfully feed, it is necessary to connect the respective feeding ports using K-type connectors.
In fig. 5, the dimensions of the respective portions of the feed transmission line are: a 1-0.6, a 2-0.2, a 3-0.4, a 4-0.44, b 1-0.3, b 2-0.84, b 3-0.6, b 4-0.7, b 5-0.5, and b 6-1.0, all units being mm.
Fig. 6 is an equivalent circuit diagram when a high level is applied to the microstrip feed transmission line in the present embodiment.
As shown in fig. 6, when the voltage V1 applied to the one end of the resistor R is a predetermined voltage value V0, the diode K1 is turned on, the diode K2 is turned off (i.e., the switch 1 is turned on, and the switch 2 is turned off), and the phase of the radiation electric field of the antenna unit 11 is 0.
Fig. 7 is an equivalent circuit diagram when a low level is applied to the microstrip feed transmission line in the present embodiment.
As shown in fig. 7, when the voltage V1 applied to one end of the resistor R is 0, the diode K1 is turned off, the diode K2 is turned on (i.e., the switch 1 is off, and the switch 2 is on), and the phase of the radiation electric field of the antenna element 11 is-pi.
As described above, the antenna element 11 realizes the-pi or 0 phase by selecting the feeding direction of the microstrip-fed transmission line, that is, applies two fixed phases, thereby mitigating the negative effect of the one-bit phase quantization error.
In addition, as shown in fig. 1, when four antenna elements 11 are combined into the antenna 10, a large metal ground 114a may be used as the metal ground of the four antenna elements 11. In fig. 1, the length ALg of the large metal ground 114a is 27mm, the width AWg is 10mm, and the distance P between two adjacent antenna elements 11 along the x-axis direction is 6 mm. Four rectangular feed slots are formed in the large metal ground 114a, corresponding to the four antenna elements 11.
Fig. 8 is a schematic structural diagram of the power divider in this embodiment.
As shown in fig. 8, the antenna 10 of this embodiment further includes a power divider 20, where the power divider 20 is a one-to-four power divider, ports 2 to 5 of the power divider 20 are respectively connected to the feeding ports P1 of the four antenna elements 11, and port 1 of the power divider 20 is connected to the input signal. The structure and working principle of the one-to-four power divider are specifically the prior art, and therefore are not described in detail.
In addition, in fig. 8, the dimensions of each part of the power divider are respectively: w 1-0.44, w 2-0.2, w 3-0.1, w 4-0.33, w 5-0.33, w 6-0.46, w 7-0.8, l 1-11.8, l 2-1.9, l 3-5.8, l 4-1.65, l 5-0.9, l 6-1.33, l 7-1.27, l 8-0.76, all units being mm.
Fig. 9 is a diagram of simulation results of S11 of the antenna unit of the one-bit reconfigurable millimeter wave array antenna in the present embodiment in two states.
Fig. 10 is a diagram of main polarization and cross polarization of the one-bit reconfigurable millimeter wave array antenna in the present embodiment.
Fig. 11 is a graph showing array performance of the one-bit reconfigurable millimeter wave array antenna according to the present embodiment as a function of a switching parameter.
Fig. 12 is a simulation diagram of radiation directions of the one-bit reconfigurable millimeter wave array antenna in the embodiment in different desired beam directions.
As shown in fig. 9 to 12, in this embodiment, a simulation experiment and an actual product test are performed on the one-bit reconfigurable mm-wave array antenna 10, in the actual test, the S parameter of the antenna 10 is measured by using a german technology PNA network analyzer N5227A (10MHz-67GHz), the radiation pattern is measured in an electromagnetic wave darkroom, and it should be noted that the bandwidth of the antenna 10 needs to be greater than the bandwidth of an element for introducing a power divider.
It has been measured that the antenna 10 of the present embodiment can direct the main beam from-34 deg. to 35 deg. without grating lobes in the frequency range of 26GHz-28 GHz. Furthermore, the intersection plan value measured in the main beam direction is below-16 dB. The radiation pattern measured by the actual product is consistent with the radiation pattern simulated by the simulation. There is a certain difference between the measured pattern and the simulated pattern, which may be caused by manufacturing errors and different specification parameters of the PIN diodes in the measurement and simulation.
The parts of the present invention not described in detail are well known in the art.
Examples effects and effects
According to the one-bit reconfigurable millimeter wave array antenna provided by the embodiment, the reconfigurable one-bit multi-unit array antenna is formed because the antenna elements are arranged in an array manner, each antenna element feeds power through the feed slot on the metal ground and the corresponding feed transmission line, and the feed transmission line comprises two diodes, so that the phase of the radiation electric field of the corresponding antenna element is limited to the first predetermined phase or the second predetermined phase, the negative influence caused by one-bit phase quantization error can be reduced, the ideal control on the direction and the performance of a wave beam can be realized under the condition of not adopting an additional phase shifter, the function of one-bit array without grating lobes is realized, and the size of the array antenna is further reduced.
In the embodiment, a simulation experiment and a test of an actual product are carried out, and through the test, the overlapping-10 dB impedance bandwidth of the one-bit reconfigurable millimeter wave array antenna of the embodiment in different beam directions reaches 3GHz (25-28 GHz). In the frequency range of 26-28GHz, the array with fixed phase can control the phase range of the main beam to be-34-35 degrees under the condition of no grating lobe, and the control beam realizes the indexes of good array gain, side lobe level in the normal range and low cross polarization.
The above-described embodiments are merely illustrative of specific embodiments of the present invention, and the present invention is not limited to the description of the above-described embodiments.
In the above embodiment, the one-bit reconfigurable millimeter wave array antenna 10 has four antenna elements 11, which form a one-bit four-element array, and in an alternative, the one-bit reconfigurable millimeter wave array antenna 10 may also have eight or more antenna elements 11, or have dual-polarized element lines, which also can achieve the technical effects of the present invention.
Claims (9)
1. A one-bit reconfigurable millimeter wave array antenna, comprising:
a plurality of antenna units arranged in an array to form a bit array,
wherein each antenna unit comprises a radiation layer, an antenna dielectric layer, a metal ground, a feed dielectric layer and a feed line layer which are sequentially stacked from top to bottom,
a feed groove is arranged on the metal ground,
a feed transmission line is formed on the feed line layer,
the radiation layer is connected with a feed source in a conduction mode through the feed slot and the feed transmission line,
the feed transmission line includes two diodes for making the phase of the radiation electric field of the antenna element only a first predetermined phase or a second predetermined phase, thereby realizing a random phase grating-lobe-free function.
2. The one-bit reconfigurable millimeter wave array antenna of claim 1, wherein:
wherein the first predetermined phase is 0 and the second predetermined phase is-pi.
3. The one-bit reconfigurable millimeter wave array antenna of claim 1, wherein:
the radiation layer is a rectangular metal radiation patch, the length of the radiation layer is 2.7mm, and the width of the radiation layer is 2.7 mm.
4. The one-bit reconfigurable millimeter wave array antenna of claim 1, wherein:
wherein the length and the width of the metal ground are both 10mm,
the rectangular channel is seted up the middle part on metal ground, the length of rectangular channel is 2.3mm, and the width is 0.2 mm.
5. The one-bit reconfigurable millimeter wave array antenna of claim 1, wherein:
wherein the feeding transmission line comprises a DC transmission line L1, a DC transmission line L2, a feeding transmission line L3, a diode K1, a diode K2, a resistor R, a capacitor C and a metal cylinder CL1,
one end of the resistor R is connected to a direct current power supply, the other end of the resistor R is connected to one end of the direct current transmission line L1, the other end of the direct current transmission line L1 is connected to a feed transmission line L3, the diode K1 and the diode K2 are connected in series in the feed transmission line L3, the other end of the feed transmission line L3 is connected to both one end of the direct current transmission line L2 and one end of the capacitor C, the other end of the capacitor C is connected to the feed power supply, and the other end of the direct current transmission line L2 is grounded through the metal cylinder CL 1.
6. The bit-reconfigurable millimeter wave array antenna of claim 5, wherein:
the diode K1 and the diode K2 are both PIN diodes, and the models are MA4AGFCP 910.
7. The bit-reconfigurable millimeter wave array antenna of claim 5, wherein:
the feeding transmission line further includes a fan-shaped metal wire F1 connected to one end of the dc transmission line L1 near the resistor R.
8. The bit-reconfigurable millimeter wave array antenna of claim 1, wherein:
the antenna dielectric layer is a Rogers RT5880 single-layer dielectric substrate, the relative dielectric constant of the antenna dielectric layer is 2.2, the loss tangent of the antenna dielectric layer is 0.0009, and the height of the antenna dielectric layer is 0.508 mm.
9. The one-bit reconfigurable millimeter wave array antenna of claim 1, wherein:
the feed dielectric layer is a Rogers RO4003C double-layer dielectric substrate, the relative dielectric constant of the feed dielectric layer is 3.55, the loss tangent is 0.0027, and the height is 0.203 mm.
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| CN202210185988.8A CN114498079A (en) | 2022-02-28 | 2022-02-28 | One-bit reconfigurable millimeter wave array antenna |
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| CN202210185988.8A CN114498079A (en) | 2022-02-28 | 2022-02-28 | One-bit reconfigurable millimeter wave array antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116387823A (en) * | 2023-04-04 | 2023-07-04 | 合肥师范学院 | X-band broadband slot coupling beam reconfigurable antenna |
| CN116526162A (en) * | 2023-05-29 | 2023-08-01 | 电子科技大学 | Dual-channel dual-linear polarization 2-bit array antenna |
-
2022
- 2022-02-28 CN CN202210185988.8A patent/CN114498079A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116387823A (en) * | 2023-04-04 | 2023-07-04 | 合肥师范学院 | X-band broadband slot coupling beam reconfigurable antenna |
| CN116387823B (en) * | 2023-04-04 | 2024-04-09 | 合肥师范学院 | X-band broadband slot coupling beam reconfigurable antenna |
| CN116526162A (en) * | 2023-05-29 | 2023-08-01 | 电子科技大学 | Dual-channel dual-linear polarization 2-bit array antenna |
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