Ultra-wideband dual-polarized reflectarray antenna and arbitrary linear polarization synthesis method thereof

Abstract

This invention provides an ultra-wideband dual-polarized reflective array antenna and its arbitrary linear polarization synthesis method, belonging to the field of microwave antennas. It includes multiple reflective elements arranged in an array, each reflecting element comprising a first to a fourth dielectric layer stacked sequentially; a coupling metal layer disposed on the side of the first dielectric layer facing away from the second dielectric layer; the coupling metal layer comprising multiple first coupling patches arranged in an array; a metal patch layer disposed on the side of the second dielectric layer facing away from the third dielectric layer; the metal patch layer comprising a first elongated patch and a second elongated patch, with a second coupling patch located at the intersection of the extension lines of the first and second elongated patches; an isolation layer sandwiched between the second and third dielectric layers; a metal ground layer sandwiched between the third and fourth dielectric layers; a DC feed layer disposed on the side of the fourth dielectric layer facing away from the third dielectric layer; and beam phase decoupling from polarization phase.

Description

Technical Field

[0001] This invention relates to the field of microwave antenna technology, and more particularly to an ultra-wideband dual-polarized reflective array antenna and a method for arbitrary linear polarization synthesis thereof. Background Technology

[0002] The development of modern communication systems has significantly increased the demands on radio frequency (RF) transmitters, especially requiring transmitters to simultaneously possess beam scanning and multi-polarization control functions. In recent years, reconfigurable arrays, such as reflective and transmissive arrays, which integrate active devices at the unit level to achieve beam scanning and other functions, have attracted increasing attention due to their low cost and dynamic electromagnetic wave manipulation capabilities. However, most current reconfigurable array units only possess a 1-bit phase response, meaning that reconfigurable arrays can only achieve a single beam scanning function and cannot integrate polarization control. Arrays designed for polarization control cannot achieve beam scanning because all modulation dimensions are dedicated to polarization control. Simultaneously integrating beam scanning and polarization control functions places high demands on the units' electromagnetic wave amplitude and phase modulation capabilities. Current reconfigurable arrays are limited to beam scanning or polarization control in terms of electromagnetic wave physical characteristic modulation, and achieving both modulation simultaneously requires high cost and complex structures. Therefore, this invention aims to propose an ultra-wideband reconfigurable reflective array that integrates beam scanning and polarization control functions in a low-cost manner. Summary of the Invention

[0003] The technical problem to be solved by this invention is: how to solve the problem that existing reconfigurable reflective arrays cannot simultaneously perform beam scanning and polarization control functions.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution: an ultra-wideband dual-polarized reflective array antenna, comprising a plurality of reflective elements arranged in an array, each reflective element comprising a first dielectric layer, a second dielectric layer, a third dielectric layer and a fourth dielectric layer stacked sequentially;

[0005] A coupling metal layer is disposed on the side of the first dielectric layer opposite to the second dielectric layer; the coupling metal layer includes a plurality of first coupling patches arranged in an array.

[0006] A metal patch layer is disposed on the side of the second dielectric layer away from the third dielectric layer; the metal patch layer includes a first strip patch and a second strip patch, and a second coupling patch is provided at the intersection of the extension lines of the first strip patch and the second strip patch;

[0007] An isolation layer is sandwiched between the second dielectric layer and the third dielectric layer;

[0008] A metallic stratum, sandwiched between the third and fourth dielectric layers;

[0009] The DC feed layer is located on the side of the fourth dielectric layer opposite to the third dielectric layer.

[0010] The first strip patch and the second strip patch each include a first metal patch and a second metal patch connected by a diode. The first metal patch is connected to the DC feed layer and the isolation layer through a metallized via, and the second metal patch is connected to the metal ground layer through a metallized via.

[0011] Preferably, a support layer is provided between the coupling metal layer and the first dielectric layer.

[0012] Preferably, the first metal patch is connected to the anode of the diode, and the second metal patch is connected to the cathode of the diode. By controlling the on / off state of the diode on the first strip patch, the following can be achieved: The phase response of the polarized wave is achieved by controlling the on / off state of the diode on the second strip patch. Phase response of polarized waves.

[0013] Preferably, the reflection unit has four coding states. These are states 00, 01, 10, and 11, respectively. for The response of the polarization channel for The polarization channel response is coded as 0 to indicate that the diode is off, and coded as 1 to indicate that the diode is on.

[0014] Preferably, based on the desired beam pointing of the reflector array antenna. Calculate the first Phase of each unit The method is as follows:

[0015]

[0016] in, For free space wavenumber, For the array center and the first Position vectors between units The distance between the feed phase center and the array center. This serves as the global reference phase.

[0017] Preferably, the difference between the global reference phase of the second strip patch and the first strip patch of each reflective unit is set to... The reflective array antenna radiates left-hand circularly polarized waves. This is achieved by setting the difference in global reference phase between the second and first strip patches of each reflective element to be [value missing]. The reflector array antenna radiates right-hand circularly polarized waves.

[0018] Preferably, by dividing all reflecting elements in the reflective array antenna into two regions, the difference between the global reference phase of the second strip patch and the first strip patch of each reflecting element in one region is... The difference in global reference phase between the second strip patch and the first strip patch of each reflective unit in another region is... Arbitrary linear polarization can be synthesized by adjusting the phase of left-handed and right-handed circular polarization.

[0019] Preferably, the polarization angle of the linearly polarized wave for:

[0020]

[0021] in, The phase difference between the left-hand circularly polarized wave and the right-hand circularly polarized wave. , For the phase of a left-hand circularly polarized wave, This represents the phase of a right-hand circularly polarized wave.

[0022] Preferably, the polarization angle of the linearly polarized wave The relationship with the global reference phase is as follows:

[0023]

[0024] in, To adjust the polarization component in the region of left-hand circularly polarized radiation The global reference phase of the far-field radiation pattern. To adjust the polarization component in the region of left-hand circularly polarized radiation The global reference phase of the far-field radiation pattern. To adjust the polarization component in the region of right-hand circularly polarized radiation The global reference phase of the far-field radiation pattern. To adjust the polarization component in the region of right-hand circularly polarized radiation Global reference phase and polarization components of the far-field pattern and polarization components For the two components of the spherical coordinate system, A constant factor, The polarization angle is the polarization angle of the linearly polarized wave.

[0025] This invention also provides a method for arbitrary linear polarization synthesis of an ultra-wideband dual-polarized reflective array antenna, employing an ultra-wideband dual-polarized reflective array antenna, the method comprising:

[0026] The reflector array antenna is divided into region one and region two. The encoding under four global reference phases is calculated for each region. The four global reference phases are the global reference phases of the first strip patch of each reflector element in region one. Global reference phase of the second strip patch And the global reference phase of the first strip patch of each reflective unit in region two. Global reference phase of the second strip patch ;

[0027] Select the required mask based on the desired polarization. When the mask value is 1, select the code in region one; when the mask value is 0, select the code in region two to generate the required code.

[0028] The advantages provided by this invention are:

[0029] 1. This invention relates to an ultra-wideband dual-polarized reflective array antenna, which simultaneously achieves beam scanning and polarization reconfiguration based on a dual-polarized array and a global reference phase. The beam phase can be decoupled from the polarization phase, meaning that the polarization can be switched in real time as needed even when the beam points in different directions. The achieved polarization covers arbitrary linear polarization and dual circular polarization.

[0030] 2. The present invention achieves ultra-wideband modulation by providing a second coupling patch at the intersection of the extension lines of the first strip patch and the second strip patch, and by setting multiple first coupling patches arranged in an array on the first dielectric layer, with a unit 1-bit phase bandwidth of 76.9%. Attached Figure Description

[0031] Figure 1 A schematic diagram of an ultra-wideband dual-polarized reflective array antenna provided in an embodiment of the present invention;

[0032] Figure 2 This is a top view of the coupled metal layer in an ultra-wideband dual-polarized reflective array antenna provided in an embodiment of the present invention;

[0033] Figure 3 This is a top view of the metal patch layer in the ultra-wideband dual-polarized reflective array antenna provided in an embodiment of the present invention;

[0034] Figure 4 This is a top view of the isolation layer in an ultra-wideband dual-polarized reflective array antenna provided in an embodiment of the present invention;

[0035] Figure 5 This is a top view of the DC feed layer in the ultra-wideband dual-polarized reflective array antenna provided in an embodiment of the present invention;

[0036] Figure 6(a) shows the simulation results of the reflection amplitude of the reflective element in the ultra-wideband dual-polarized reflective array antenna provided in the embodiment of the present invention as a function of frequency in the 00 state.

[0037] Figure 6(b) shows the simulation results of the reflection amplitude of the reflective element in the ultra-wideband dual-polarized reflective array antenna provided in the embodiment of the present invention as a function of frequency under the 01 state.

[0038] Figure 6(c) shows the simulation results of the reflection amplitude of the reflection element in the ultra-wideband dual-polarized reflective array antenna provided in the embodiment of the present invention as a function of frequency under state 10.

[0039] Figure 6(d) shows the simulation results of the reflection amplitude of the reflective element in the ultra-wideband dual-polarized reflective array antenna provided in the embodiment of the present invention as a function of frequency under state 11.

[0040] Figure 7(a) shows the simulated reflection phase of the reflection element in the ultra-wideband dual-polarized reflective array antenna provided in the embodiment of the present invention in states 00 and 11. Variation with frequency;

[0041] Figure 7(b) shows the simulated reflection phase of the reflection element in the ultra-wideband dual-polarized reflector array antenna provided in the embodiment of the present invention in states 00 and 11. Variation with frequency;

[0042] Figure 7(c) shows the simulated reflection phase of the reflection element in the ultra-wideband dual-polarized reflective array antenna provided in the embodiment of the present invention under states 01 and 10. Variation with frequency;

[0043] Figure 7(d) shows the simulated reflection phase of the reflection element in the ultra-wideband dual-polarized reflector array antenna provided in the embodiment of the present invention in states 01 and 10. Variation with frequency;

[0044] Figure 8(a) shows the test environment of the ultra-wideband dual-polarized reflective array antenna provided in the embodiment of the present invention;

[0045] Figure 8(b) is a schematic diagram of the upper layer of the ultra-wideband dual-polarized reflective array antenna provided in an embodiment of the present invention;

[0046] Figure 8(c) is a schematic diagram of the overall DC feed network of the ultra-wideband dual-polarized reflective array antenna provided in the embodiment of the present invention;

[0047] Figure 9(a) shows the beam scanning results of the ultra-wideband dual-polarized reflective array antenna with left-hand circular polarization at 8 GHz provided in the embodiment of the present invention.

[0048] Figure 9(b) shows the beam scanning results of the ultra-wideband dual-polarized reflector array antenna with right-hand circular polarization at 8 GHz provided in the embodiment of the present invention.

[0049] Figure 9(c) shows the beam scanning results of the ultra-wideband dual-polarized reflective array antenna with left-hand circular polarization at 13 GHz provided in the embodiment of the present invention.

[0050] Figure 9(d) shows the beam scanning results of the ultra-wideband dual-polarized reflector array antenna with right-hand circular polarization at 13 GHz provided in the embodiment of the present invention;

[0051] Figure 9(e) shows the beam scanning results of the ultra-wideband dual-polarized reflector array antenna with left-hand circular polarization at 16 GHz provided in the embodiment of the present invention.

[0052] Figure 9(f) shows the beam scanning results of the ultra-wideband dual-polarized reflector array antenna with right-hand circular polarization at 16 GHz provided in the embodiment of the present invention;

[0053] Figure 10(a) shows the beam scanning results of the ultra-wideband dual-polarized reflective array antenna with -45° linear polarization at 8 GHz provided in the embodiment of the present invention.

[0054] Figure 10(b) shows the beam scanning results of the ultra-wideband dual-polarized reflector array antenna provided in the embodiment of the present invention at +45° linear polarization at 8 GHz;

[0055] Figure 10(c) shows the beam scanning results of the ultra-wideband dual-polarized reflective array antenna with -45° linear polarization at 13 GHz provided in the embodiment of the present invention.

[0056] Figure 10(d) shows the beam scanning results of the ultra-wideband dual-polarized reflector array antenna provided in the embodiment of the present invention at +45° linear polarization at 13 GHz;

[0057] Figure 10(e) shows the beam scanning results of the ultra-wideband dual-polarized reflector array antenna provided in the embodiment of the present invention with -45° linear polarization at 16 GHz;

[0058] Figure 10(f) shows the beam scanning results of the ultra-wideband dual-polarized reflector array antenna provided in the embodiment of the present invention at +45° linear polarization at 16 GHz;

[0059] Figure 11(a) shows the gain curve, axial ratio curve and aperture efficiency curve of the ultra-wideband dual-polarized reflective array antenna with left-hand and right-hand circular polarization at a 15-degree beam scanning angle provided in the embodiment of the present invention.

[0060] Figure 11(b) shows the gain curves and aperture efficiency curves of the ultra-wideband dual-polarized reflective array antenna provided in the embodiment of the present invention at a beam scanning angle of 15 degrees with -45° and +45° linear polarization.

[0061] Figure 12(a) is a beam scanning result of the 0° linear polarization of the ultra-wideband dual-polarized reflective array antenna provided in the embodiment of the present invention;

[0062] Figure 12(b) is a beam scanning result of the ultra-wideband dual-polarized reflective array antenna with 90° linear polarization provided in the embodiment of the present invention;

[0063] Figure 12(c) is a beam scanning result diagram of the ultra-wideband dual-polarized reflective array antenna with -30° linear polarization provided in the embodiment of the present invention;

[0064] Figure 12(d) is a beam scanning result diagram of the ultra-wideband dual-polarized reflective array antenna with -60° linear polarization provided in the embodiment of the present invention;

[0065] Figure 13(a) shows the -30° linear polarization of the ultra-wideband dual-polarized reflector array antenna provided in an embodiment of the present invention. Two-dimensional polarization pattern;

[0066] Figure 13(b) shows the -30° linear polarization of the ultra-wideband dual-polarized reflector array antenna provided in an embodiment of the present invention. Two-dimensional polarization pattern;

[0067] Figure 13(c) is a two-dimensional radiation pattern representing the common polarization component of the -30° linear polarization of the ultra-wideband dual-polarized reflective array antenna provided in an embodiment of the present invention;

[0068] Figure 13(d) is a two-dimensional radiation pattern representing the cross-polarization component of the -30° linear polarization of the ultra-wideband dual-polarized reflector array antenna provided in an embodiment of the present invention;

[0069] Figure 13(e) shows the common polarization and cross polarization components of the ultra-wideband dual-polarized reflector antenna provided in the embodiment of the present invention. One-dimensional radiation pattern at 0°;

[0070] Figure 13(f) shows the ultra-wideband dual-polarized reflector antenna provided in an embodiment of the present invention. polarization and polarization components, in One-dimensional radiation pattern at 330°;

[0071] Figure 14 The far-field phase variation trend of the ultra-wideband dual-polarized reflective array antenna provided in this embodiment of the invention with reference phase under different frequencies and quantization conditions;

[0072] Figure 15 This is a schematic diagram of the arbitrary linear polarization synthesis method for an ultra-wideband dual-polarized reflective array antenna provided in an embodiment of the present invention;

[0073] In the figure: 10 Coupling metal layer, 11 First coupling patch, 20 First dielectric layer, 21 Support layer, 31 First strip patch, 311 First metal patch, 312 Second metal patch, 32 Second strip patch, 33 Second coupling patch, 40 Second dielectric layer, 50 Isolation layer, 60 Third dielectric layer, 70 Metal ground layer, 80 Fourth dielectric layer, 90 DC power supply layer, 91 First bias line, 92 Second bias line, 101 First metallized via, 102 Second metallized via, 103 Third metallized via, 104 Fourth metallized via. Detailed Implementation

[0074] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0075] like Figure 1 As shown, this embodiment provides an ultra-wideband dual-polarized reflective array antenna, including multiple reflective elements arranged in an array, for example, Individual presentation Array of reflective units, , In this embodiment Each reflective unit includes, from top to bottom, a coupling metal layer 10, a first dielectric layer 20, a metal patch layer, a second dielectric layer 40, an isolation layer 50, a third dielectric layer 60, a metal ground layer 70, a fourth dielectric layer 80, and a DC feed layer 90. The coupling metal layer 10 includes a plurality of first coupling patches 11 arranged in an array, for example, Individual presentation The first coupling patch 11 in the array arrangement, In this embodiment, The first coupling patch 11 is square.

[0076] The first dielectric layer 20 is made of F4BM220 with a dielectric constant of 2.2, and its thickness is [missing information]. The first dielectric layer 20 is fixed above the second dielectric layer 40 by the support layer 21. The support layer 21 is used to support the coupling metal layer 10 and can be obtained by 3D printing. The material is a 3D printing material, such as polylactic acid, with a dielectric constant of 2.72.

[0077] The metal patch layer includes a first strip patch 31 and a second strip patch 32, the first strip patch 31 along... Figure 1 In Directional arrangement, used for processing Polarized incident wave, second strip patch 32 along Figure 1 In Directional arrangement, used for processing The polarized incident wave, the first strip patch 31 and the second strip patch 32 respectively include a first metal patch 311 and a second metal patch 312 connected by diodes. In the first strip patch 31, the first metal patch 311 and the second metal patch 312 are connected through a first diode, with the first metal patch 311 connected to the anode of the first diode and the second metal patch 312 connected to the cathode of the first diode. In the second strip patch 32, the first metal patch 311 and the second metal patch 312 are connected through a second diode, with the first metal patch 311 connected to the anode of the second diode and the second metal patch 312 connected to the cathode of the second diode. The two diodes are used to control the reflection phase. When the diodes are off, the phase of the reflected wave is 0 degrees; when the diodes are on, the phase of the reflected wave is 180 degrees. By controlling the on / off state of the first diode on the first strip patch 31, the polarization is achieved. The phase response of the polarized wave is achieved by controlling the on / off state of the second diode on the second strip patch 32. Phase response of polarized waves.

[0078] Each reflection unit has four coding states. These are states 00, 01, 10, and 11, respectively. for The response of the polarization channel for The polarization channel response is coded as 0 to indicate that the diode is off, and coded as 1 to indicate that the diode is on.

[0079] The first metal patch 311 is connected to the DC feed layer 90 and the isolation layer 50 through a metallized via. The second metal patch 312 is connected to the metal ground layer 70 through a metallized via. A second coupling patch 33 is loaded at the intersection of the extension lines of the first strip patch 31 and the second strip patch 32 to form a tightly coupled structure to extend the impedance bandwidth of the cell. In this embodiment, the second coupling patch 33 is square.

[0080] This invention loads a second coupling patch 33 at the intersection of the extension lines of the first elongated patch 31 and the second elongated patch 32. The first elongated patch 31, the second elongated patch 32, and the second coupling patch 33 can be equivalent to inductors, and the gaps between the second coupling patch 33 and the first elongated patch 31, and between the second coupling patch 33 and the second elongated patch 32, can be equivalent to capacitors. The reactance generated by the equivalent capacitance and inductance cancels each other out, making the imaginary part of the impedance close to zero. This ultimately achieves free-space matching within a wide frequency range, realizing a wide impedance bandwidth. Similarly, in the ultra-wideband dual-polarized reflector unit… z A coupling structure (coupling metal layer 10) is introduced in the directional direction. The metal structure of the unit can be equivalent to an inductor, which will cause an imaginary part of the impedance. The gap between adjacent first coupling patches 11 can be equivalent to a capacitor. The reactance generated by the equivalent capacitance and the inductance will cancel each other out, making the imaginary part of the impedance close to 0. Ultimately, the structure can match free space in a wide frequency range, further improving the impedance bandwidth of the reflection unit. The gap between the metals can be equivalent to a capacitor, which is the core method of introducing equivalent capacitance. This invention... x , y , z Introducing this type of equivalent capacitor structure in all three directions can significantly improve the impedance bandwidth.

[0081] The second dielectric layer 40 is made of F4BTME350 with a dielectric constant of 3.5. The third dielectric layer 60 and the fourth dielectric layer 80 are both made of FR-4 with a dielectric constant of 4.3. An isolation layer 50 is used to isolate RF signals and DC signals. The isolation layer 50 includes a first sector capacitor and a second sector capacitor. The DC feed layer 90 is used to control the state of the two diodes. The DC feed layer 90 includes two bias lines, a first bias line 91 and a second bias line 92. One end of the first bias line 91 is connected to one end of the first metallized via 101. The first metallized via 101 penetrates the metal ground layer 70, the third dielectric layer 60, and the second dielectric layer 40 and is connected to the first sector capacitor. The other end of the first metallized via 101 is connected to the first metal patch 311 in the first strip patch 31. The other end of the first bias line 91 extends to the edge of the DC feed layer 90. The second metal patch 312 in the first strip patch 31 is connected to the upper surface of the DC feed layer 90 through the third metallized via 103.

[0082] One end of the second bias line 92 is connected to one end of the second metallized via 102, which penetrates the metal ground layer 70, the third dielectric layer 60, and the second dielectric layer 40 and connects to the second sector capacitor. The other end of the second metallized via 102 is connected to the first metal patch 311 in the second strip patch 32. The other end of the second bias line 92 extends to the edge of the DC feed layer 90. The second metal patch 312 in the second strip patch 32 is connected to the upper surface of the DC feed layer 90 through the fourth metallized via 104.

[0083] The designed ultra-wideband dual-polarized reflector unit was simulated using CST Microwave Studio simulation software to verify the effectiveness of the design. Periodic boundary conditions were used, and the diodes were implemented as equivalent RLC series circuits. The simulation results are shown in Figures 6(a), 6(b), 6(c), 6(d), 7(a), 7(b), 7(c), and 7(d). A two-bit binary code was used to describe the operating states of the first and second diodes: 00 indicates that both diodes are off; 01 indicates that the first diode is off and the second diode is on; 10 indicates that the first diode is on and the second diode is off; and 11 indicates that both diodes are on.

[0084] Figures 6(a), 6(b), 6(c), and 6(d) show the simulation results of the unit reflection amplitude as a function of frequency under different states (state 00, state 01, state 10, and state 11). The horizontal axis represents frequency in GHz, and the vertical axis represents reflection amplitude in dB. subscript The first Indicates that the output polarization is polarization, subscript The second Indicates that the input polarization is polarization, Indicates that the input polarization is In the case of polarization, unit reflection The amplitude of the polarized wave. Similarly, subscript of Indicates that the output polarization is polarization, subscript of Indicates that the input polarization is polarization, Indicates that the input polarization is In the case of polarization, unit reflection The amplitude of the polarized wave. subscript The first Indicates that the output polarization is polarization, subscript The second Indicates that the input polarization is polarization, Indicates that the input polarization is In the case of polarization, unit reflection The amplitude of the polarized wave. subscript of Indicates that the output polarization is polarization, subscript of Indicates that the input polarization is polarization, Indicates that the input polarization is In the case of polarization, unit reflection The amplitude of the polarized wave. Figure 6(a) illustrates the ultra-wideband dual-polarized reflector unit in the 00 state. , , , The value, Figure 6(b) illustrates the ultra-wideband dual-polarized reflector unit in state 01. , , , The value, Figure 6(c) illustrates the ultra-wideband dual-polarized reflector unit in state 10. , , , The value, Figure 6(d) illustrates the ultra-wideband dual-polarized reflector unit in state 11. , , , The value of . From Figures 6(a) to 6(d), it can be concluded that co-polarization ( , The emission amplitude is close to 0dB when the diode is off, but after the diode is turned on, the loss is higher than that when the diode is off due to the existence of equivalent resistance, with a maximum loss of -0.9dB.

[0085] Figures 7(a), 7(b), 7(c), and 7(d) show the simulation results of the unit reflection phase changing with frequency under different states (state 00, state 01, state 10, and state 11). The horizontal axis represents frequency in GHz, and the vertical axis represents reflection phase in degrees. subscript The first Indicates that the output polarization is polarization, subscript The second Indicates that the input polarization is polarization, Indicates that the input polarization is In the case of polarization, unit reflection The phase of a polarized wave. Similarly, subscript of Indicates that the output polarization is polarization, subscript of Indicates that the input polarization is polarization, Indicates that the input polarization is In the case of polarization, unit reflection The phase of a polarized wave. subscript The first Indicates that the output polarization is polarization, subscript The second Indicates that the input polarization is polarization, Indicates that the input polarization is In the case of polarization, unit reflection The phase of a polarized wave. subscript of Indicates that the output polarization is polarization, subscript of Indicates that the input polarization is polarization, Indicates that the input polarization is In the case of polarization, unit reflection Phase of the polarized wave. Figure 7(a) illustrates the ultra-wideband dual-polarized reflector unit in states 00 and 11. The values ​​are shown in Figure 7(b), which illustrates the ultra-wideband dual-polarized reflector unit in states 00 and 11. The values ​​are shown in Figure 7(c), which illustrates the ultra-wideband dual-polarized reflector unit in states 01 and 10. The values ​​are shown in Figure 7(d), which illustrates the ultra-wideband dual-polarized reflective unit in states 01 and 10. The value of . From Figures 7(a) to 7(d), it can be concluded that the reflected in the diode's on and off states. Polarized waves and The polarized waves all have a phase difference of 180 degrees and cover the X-band and Ku-band, with a relative bandwidth of 76.9%.

[0086] Simulations were performed on the 16×16 array-arranged ultra-wideband dual-polarized reflective array antenna of this invention, as shown in Figures 8(a), 8(b), and 8(c). Figure 8(a) shows the test environment of the ultra-wideband dual-polarized reflective array antenna provided in this embodiment; Figure 8(b) is a schematic diagram of the upper layer of the ultra-wideband dual-polarized reflective array antenna provided in this embodiment; and Figure 8(c) is a schematic diagram of the overall DC feed network of the ultra-wideband dual-polarized reflective array antenna provided in this embodiment. This invention uses a log-periodic antenna as the feed source for the reflective array, and utilizes an FPGA control circuit to control the state of the diodes, thus controlling the phase required for beam deflection of the ultra-wideband dual-polarized reflective array antenna. for:

[0087] (1)

[0088] In formula (1), For the first The required reflection phase for each unit For free space wavenumber, For the array center and the first Position vectors between units The distance between the feed phase center and the array center. The desired beam pointing for an ultra-wideband dual-polarized reflector array antenna. This serves as the global reference phase.

[0089] No. The required reflection phase for each unit The calculation result is a continuous phase. In order to adapt to the designed 1-bit phase resolution, the continuous phase needs to be quantized.

[0090] (2)

[0091] In formula (2), The phase after discretization. As a rounding function, the discrete phase has only 0 degrees and 180 degrees.

[0092] The working principle of the ultra-wideband dual-polarized reflective array antenna of this invention:

[0093] Far-field phase generation principle: The method of calculating the array radiation pattern using aperture field theory is used to introduce the basis of polarization control. An array has polarization components. and polarization components The far-field radiation pattern is calculated as follows:

[0094] (3)

[0095] (4)

[0096] Among them, polarization components and polarization components For the two components of the spherical coordinate system, polarization component The far-field radiation pattern, polarization component The far-field radiation pattern, For free space wavenumber, It is an imaginary number. For far-field distance, For free-space wave impedance, the spectrum function , , , It can be obtained through the Fourier transform of the tangential electric and magnetic fields at the array, and the calculation method is as follows:

[0097] (5-1)

[0098] (5-2)

[0099] (6-1)

[0100] (6-2)

[0101] in, , , For the first in the array Coordinates of each unit, unit orientation pattern The calculation method is as follows:

[0102] (7)

[0103] In formula (7), The cell period size of the array. Free space wavenumber, polarization component and polarization components These are the two components of the spherical coordinate system.

[0104] In formulas (5-1) and (5-2), for The reflected electric field in the polarization direction, for The reflected electric field along the polarization direction. In formulas (6-1) and (6-2), for Reflected magnetic field in the polarization direction, for The reflected magnetic field in the polarization direction. reflected electric field in polarization direction , reflected electric field in polarization direction The calculation method is as follows:

[0105] (8)

[0106] In formula (8), For the first in the array The incident vector electric field of each unit, It can be represented as:

[0107] (9)

[0108] In formula (9), For the first in the array The incident vector electric field of each unit is in Components in the polarization direction, , They are respectively direction, The unit vector of direction, For the first in the array The incident vector electric field of each unit is in Components in the polarization direction, , All of these can be obtained through simulation. For the first in the array The coordinates of each unit, For the first in the array The reflection coefficient of each unit can be calculated using formula (8). , Indicates the first in the array The vector electric field reflected by each unit includes reflected electric field in polarization direction , reflected electric field in polarization direction If we assume the local incident wave is a plane wave, then by using the relationship between the electric field, magnetic field, and the direction of electromagnetic wave propagation, we can derive the electromagnetic wave propagation solely from the reflected electric field. Reflected magnetic field in polarization direction , Reflected magnetic field in polarization direction .

[0109] The first in the array Reflection coefficient of each unit The expression is:

[0110] (10)

[0111] In formula (10), Indicates the first in the array Each unit, with input polarization as In the case of polarization, unit reflection The amplitude of the polarization wave Indicates the first in the array Each unit, with input polarization as In the case of polarization, unit reflection Phase of polarized waves, Indicates the first in the array Each unit, with input polarization as In the case of polarization, unit reflection The amplitude of the polarization wave Indicates the first in the array Each unit, with input polarization as In the case of polarization, unit reflection The amplitude of the polarization wave Indicates the first in the array Each unit, with input polarization as In the case of polarization, unit reflection The phase of a polarized wave. Indicates the first in the array Each unit, with input polarization as In the case of polarization, unit reflection Phase of polarized waves, Indicates the first in the array Each unit, with input polarization as In the case of polarization, unit reflection The amplitude of the polarization wave Indicates the first in the array Each unit, with input polarization as In the case of polarization, unit reflection The phase of a polarized wave.

[0112] Next, to demonstrate far-field phase generation, we will assume some key parameters to calculate the far-field radiation pattern. Consider a lossless... Polarized reflective unit, which is for The phase response of the polarized incident wave is 180°±20°, and the operating frequency range covers the X-band and Ku-band. For Polarized incident wave, A polarized reflector reflects an incident wave without loss, but the reflected wave has no phase response. Consider a practical example. The cross-polarization reflection coefficient of the polarized reflection unit is negligible. To avoid generating grating lobes, The period of the polarized reflective element should satisfy half the wavelength of the highest frequency. In this invention, it is assumed that... The period of the polarization reflector at 18 GHz is and use The polarized reflective elements form a 16×16 element array. Finally, a broadband feed model is established, and the electric field distribution on the array surface is simulated when the feed illuminates the array and the focal diameter ratio is 0.5.

[0113] The desired beam direction of the ultra-wideband dual-polarized reflector antenna. Set the direction to 0 degrees, and set the global reference phase in formula (1) to 0 degrees. Set to 0 degrees to 360 degrees, record different global reference phases. polarization components below Far-field pattern The far-field phase change, the result is as follows Figure 14 As shown, Figure 14 This shows the variation of the far-field phase with the reference phase under different frequencies and quantization conditions. The horizontal axis represents the initial phase value. The vertical axis represents different quantification conditions. and frequency, quantization conditions This refers to the phase difference between two states of a unit. One state is when the diode is on, and the other state is when the diode is off; these two states have different reflection phases. The color change is the value of the far-field phase. It can be seen that as... The far-field phase also exhibits a change from 0 degrees to 360 degrees, and this change is not limited by frequency and quantization conditions.

[0114] To enhance the applicability of the theory, results at 8 GHz, 13 GHz, and 18 GHz were included, and the following factors were also considered. Not a strict 180-degree phase difference. Figure 14 The results show that, in the global reference phase Polarization components as the temperature changes from 0 degrees to 360 degrees Far-field pattern It also exhibits a trend from 0 degrees to 360 degrees, and this trend is not constrained by frequency and a strict 180-degree phase difference, confirming the feasibility of applying the method in ultra-wideband applications.

[0115] Polarization Composition Principle: According to the theory of polarization composition, a linearly polarized wave can be represented by two circularly polarized waves of equal amplitude but different phases: a left-handed circularly polarized wave and a right-handed circularly polarized wave. The vector of the linearly polarized wave... The calculation method is as follows:

[0116] (11)

[0117] In formula (11), For the coefficients of a left-handed circularly polarized wave, For left-handed circularly polarized waves, For right-hand circularly polarized waves, It is the unit vector of a right-hand circularly polarized wave.

[0118] Unit vector of a left-hand circularly polarized wave The expression is:

[0119] (12)

[0120] (13)

[0121] in, polarization component unit vector, polarization component unit vector, It is an imaginary number.

[0122] Substituting formulas (12) and (13) into formula (11) yields:

[0123] (14)

[0124] By combining terms of the same unit vector, we can obtain:

[0125] (15)

[0126] In formula (15), The phase of a right-hand circularly polarized wave. The phase difference between the left-hand circularly polarized wave and the right-hand circularly polarized wave. , The phase of a left-handed circularly polarized wave can be seen, and the polarization components can be observed. and polarization components The phase terms of polarization are the same, but the amplitude terms are different.

[0127] Polarization angle of a linearly polarized wave for:

[0128] (16)

[0129] As can be seen from formula (16), the polarization angle of a linearly polarized wave is... Phase difference with left-hand circularly polarized waves and right-hand circularly polarized waves Related.

[0130] Next, dual circular polarization phase modulation is implemented in the array to achieve arbitrary linear polarization synthesis.

[0131] As can be seen from the principle of far-field phase generation, from An array of polarized reflective units radiates in the far field. The phase can be adjusted by adjusting the global reference phase. This achieves 360-degree adjustability. If a single unit simultaneously implements... Polarized waves and The polarization component can be obtained by modulating the polarization wave. Far-field pattern and polarization components Far-field pattern An array whose phases are all continuously adjustable, wherein, Polarization component adjustment Far-field pattern phase, Polarization component adjustment Far-field pattern The phase.

[0132] There are now two global reference phases used to adjust the far-field phase. These two global reference phases are: and By setting or The array can radiate either left-handed or right-handed circularly polarized waves. This is achieved by setting the difference in global reference phase between the second strip patch 32 and the first strip patch 31 of each reflective unit to be... The reflective array antenna radiates left-hand circularly polarized waves. The difference in global reference phase between the second strip patch 32 and the first strip patch 31 of each reflective element is set to... The reflector array antenna radiates right-hand circularly polarized waves.

[0133] We can now achieve the radiation of a circularly polarized wave, but synthesizing a linearly polarized wave requires the simultaneous radiation of both left-handed and right-handed circularly polarized waves. To achieve the co-radiation of two circularly polarized waves, we simply need to divide the array into two regions, with one region having the following conditions set: Defined as region one, another region is set with the following conditions: Defined as region two, it enables the co-radiation of two circularly polarized waves. By adjusting the phases of the left-hand circular polarization and the right-hand circular polarization, arbitrary linear polarization can be synthesized.

[0134] For ease of distinction, the two global reference phases used to radiate the left-hand circularly polarized wave region (Region 1) will be... , Recorded as , Two global reference phases used to radiate the right-hand circularly polarized wave region (Region 2) , Recorded as , Next, the phases of the left-hand circularly polarized wave and the right-hand circularly polarized wave need to be adjusted to achieve switchable polarization angles for the linearly polarized wave. Specifically, the polarization components radiated in region one... Far-field pattern polarization components Far-field pattern It can be represented as:

[0135] (17)

[0136] (18)

[0137] The amplitude and phase of the left-hand circularly polarized wave radiated in Region 1 are calculated as follows:

[0138] (19)

[0139] In formula (19), The amplitude of the left-hand circularly polarized wave radiated in region one.

[0140] In the array's feeding mode, the array's polarization unit and The polarization unit capability distribution is average, so ,according to Solving formula (19), we get:

[0141] (20)

[0142] in, For left-hand circularly polarized waves, Therefore, in formula (20) The phase term in formula (20) is:

[0143] (twenty one)

[0144] In formula (21), The phase of a region-1 left-hand circularly polarized wave.

[0145] The amplitude and phase of the right-hand circularly polarized wave radiated in Region 2 are calculated as follows:

[0146] (twenty two)

[0147] In formula (22), This represents the amplitude of the right-hand circularly polarized wave radiated in region two. In the array's feed mode, the array's... polarization unit and The polarization unit capability distribution is average, so ,according to Solving formula (22), we get:

[0148] (twenty three)

[0149] in, For right-hand circularly polarized waves, Therefore, in formula (23) The phase term in formula (23) is:

[0150] (twenty four)

[0151] In formula (24), The phase of the right-hand circularly polarized wave in region two.

[0152] Finally, we obtained the relationship between the four global reference phases and the phases of the left-hand circularly polarized wave and the right-hand circularly polarized wave. From formula (16), we can see that the phase difference between the linearly polarized wave and the left-hand and right-hand circularly polarized waves is related, thus yielding the final relationship:

[0153] (25)

[0154] In formula (25), The polarization angle of the linearly polarized wave. As a constant factor, solving formula (25) yields four global reference phases. , , , The relationship between the polarization angle of the linearly polarized wave and the polarization angle is as follows:

[0155] (26)

[0156] Based on the above theory, the derivation results are verified through calculation. This invention calculates a -30° linearly polarized wave as an example. The calculation results are shown in Figures 13(a) to 13(f), where Figures 13(a) and 13(b) are the calculated results respectively. polarization and Two-dimensional radiation patterns of polarization. Figure 13(c) shows the two-dimensional radiation pattern represented by the common polarization component of the -30° linear polarization of the ultra-wideband dual-polarized reflector antenna; Figure 13(d) shows the two-dimensional radiation pattern represented by the cross polarization component of the -30° linear polarization of the ultra-wideband dual-polarized reflector antenna; Figure 13(e) shows the common polarization and cross polarization components, in... One-dimensional radiation pattern at 0°. Figure 13(f) shows... polarization and polarization components, in The one-dimensional radiation pattern at 330°. As can be seen from the results in Figures 13(a) to 13(f), this sparsity method of region partitioning, combined with four global reference phases, achieves [the desired effect]. , , , By adjusting the parameters, a linearly polarized wave can be synthesized.

[0157] Step 1: As Figure 15 As shown, the codes are calculated individually for each of the four reference phases, resulting in a total of four codes. These are divided into two regions (Region 1 and Region 2). Region 1 has two codes: x-polarization and y-polarization codes. Region 2 is largely the same as Region 1, except for the global reference phase.

[0158] Step 2: Select the required mask based on the desired polarization.

[0159] Step 3: Generate the final code based on the mask. A mask value of 1 represents selecting the code in region one, and a value of 0 represents selecting the code in region two, thus obtaining the desired code.

[0160] In formula (1), the beam phase With polarization phase (Global reference phase) Changes to one phase do not affect the other, achieving decoupling between beam phase and polarization phase. The left side of equation (26) includes four global reference phases. , , , 4 global reference phases , , , The meaning of polarization phase in formula (1) The meanings are the same. By sparsely arraying into region one and region two, two independent formulas (1) can be obtained, while a single unit has polarization channels and Polarization channels, so that both region one and region two have polarization unit and The polarization unit then has a total of 4 independent formulas (1). The beam phase in these four formulas (1) is the same, while the polarization phase... The polarization can be adjusted and assigned according to the required polarization, ultimately forming the desired polarization in the desired beam direction. Simultaneously, beam scanning and polarization reconfigurability are achieved, meaning that the polarization can be switched in real time as needed when the beam points in different directions, covering arbitrary linear polarization and dual circular polarization. By providing a second coupling patch 33 at the intersection of the extension lines of the first strip patch 31 and the second strip patch 32, and by setting multiple first coupling patches 11 arranged in an array on the first dielectric layer 20, ultra-wideband control is achieved, with a unit 1-bit phase bandwidth of 76.9%.

[0161] according to Figure 1 The structure shown was fabricated and experiments were designed. The diode model was MADP-000907-14020. Figures 8(a), 8(b), and 8(c) are shown. Figure 8(a) shows the test environment of the ultra-wideband dual-polarized reflective array antenna; Figure 8(b) is a schematic diagram of the upper layer of the ultra-wideband dual-polarized reflective array antenna; and Figure 8(c) is a schematic diagram of the overall DC feed network of the ultra-wideband dual-polarized reflective array antenna. Figures 8(b) and 8(c) are schematic diagrams of the upper layer and the overall DC feed network of the ultra-wideband dual-polarized reflective array antenna, excluding the coupling metal layer 10 and the support layer 21, respectively. During the fabrication of the ultra-wideband dual-polarized reflective array antenna, the coupling metal layer 10, the support layer 21, and the array section were fabricated separately and then assembled using screws.

[0162] The overall DC feed network of the ultra-wideband dual-polarized reflector antenna is shown in Figure 8(c). The DC feed line is led out through the FPC socket welded to the back of the array. Finally, the beam deflection and polarization synthesis functions of the array were tested to verify the effectiveness of the design and proposed method. The test results are shown in Figures 9(a) to 9(f), 10(a) to 10(f), 11(a), 11(b), and 12(a) to 12(d). Figure 9(a) shows the beam scan result of the ultra-wideband dual-polarized reflector antenna with left-hand circular polarization at 8 GHz, and Figure 9(b) shows the beam scan result of the ultra-wideband dual-polarized reflector antenna with right-hand circular polarization at 8 GHz. Figure 9(c) shows the beam scan result of the ultra-wideband dual-polarized reflector antenna with left-hand circular polarization at 13 GHz, and Figure 9(d) shows the beam scan result of the ultra-wideband dual-polarized reflector antenna with right-hand circular polarization at 13 GHz. Figure 9(e) shows the beam scanning results of the ultra-wideband dual-polarized reflector antenna with left-hand circular polarization at 16 GHz, and Figure 9(f) shows the beam scanning results of the ultra-wideband dual-polarized reflector antenna with right-hand circular polarization at 16 GHz. From Figures 9(a) to 9(f), it can be seen that the axial ratio is less than 3 dB at different beam scanning angles, verifying that the circularly polarized waves have high purity at different scanning angles.

[0163] Figure 10(a) shows the beam scan results of the ultra-wideband dual-polarized reflector antenna with -45° linear polarization at 8 GHz; Figure 10(b) shows the beam scan results of the ultra-wideband dual-polarized reflector antenna with +45° linear polarization at 8 GHz; Figure 10(c) shows the beam scan results of the ultra-wideband dual-polarized reflector antenna with -45° linear polarization at 13 GHz; Figure 10(d) shows the beam scan results of the ultra-wideband dual-polarized reflector antenna with +45° linear polarization at 13 GHz; Figure 10(e) shows the beam scan results of the ultra-wideband dual-polarized reflector antenna with -45° linear polarization at 16 GHz; and Figure 10(f) shows the beam scan results of the ultra-wideband dual-polarized reflector antenna with +45° linear polarization at 16 GHz. In the diagram, solid lines represent the primary polarization, and dashed lines represent cross-polarization. For example, in Figure 10(a), -45 degrees is the primary polarization, and +45 degrees is the cross-polarization. In Figure 10(b), +45 degrees is the primary polarization, and -45 degrees is the cross-polarization. From Figures 10(a) to 10(f), it can be seen that in the direction of the primary beam, the cross-polarization is less than -15 dB.

[0164] Figure 11(a) shows the gain, axial ratio, and aperture efficiency curves for left-hand and right-hand circular polarization at a 15-degree beam scanning angle. Figure 11(b) shows the gain and aperture efficiency curves for -45° and +45° linear polarization at a 15-degree beam scanning angle. All curves are in the direction the beam points at 15°, and the scanning plane is the yoz plane. As shown in Figure 11(a), the axial ratio bandwidths for left-hand and right-hand circular polarization are 72.5% and 74.6%, respectively; the 3dB gain bandwidths are 46.1% and 58.6%, respectively; and the maximum aperture efficiencies are 18.6% and 22.7%, respectively. As shown in Figure 11(b), the gain bandwidths for -45° and +45° linear polarization are 67.7% and 62.4%, respectively; and the maximum aperture efficiencies are 21.4% and 19.4%, respectively. The design verifies the ultra-wideband operating characteristics of the proposed design. Figure 12(a) shows the beam scanning results for 0° linear polarization; Figure 12(b) shows the beam scanning results for 90° linear polarization; Figure 12(c) shows the beam scanning results for -30° linear polarization; Figure 12(d) shows the beam scanning results for -60° linear polarization.

[0165] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultra-wideband dual-polarized reflective array antenna, characterized in that: It includes multiple reflective units arranged in an array, each reflective unit including a first dielectric layer (20), a second dielectric layer (40), a third dielectric layer (60), and a fourth dielectric layer (80) stacked in sequence. A coupling metal layer (10) is disposed on the side of the first dielectric layer (20) away from the second dielectric layer (40); the coupling metal layer (10) includes a plurality of first coupling patches (11) arranged in an array. A metal patch layer is disposed on the side of the second dielectric layer (40) away from the third dielectric layer (60); the metal patch layer includes a first strip patch (31) and a second strip patch (32), and a second coupling patch (33) is provided at the intersection of the extension lines of the first strip patch (31) and the second strip patch (32). An isolation layer (50) is sandwiched between the second dielectric layer (40) and the third dielectric layer (60); The metallic stratum (70) is sandwiched between the third dielectric layer (60) and the fourth dielectric layer (80); A DC feed layer (90) is disposed on the side of the fourth dielectric layer (80) away from the third dielectric layer (60); The first strip patch (31) and the second strip patch (32) respectively include a first metal patch (311) and a second metal patch (312) connected by a diode. The first metal patch (311) is connected to the DC feed layer (90) through a metallized via and is connected to the isolation layer (50). The second metal patch (312) is connected to the metal ground layer (70) through a metallized via. By dividing all reflective elements in the reflective array antenna into two regions, the difference between the global reference phase of the second strip patch (32) and the first strip patch (31) of each reflective element in one region is... The difference in global reference phase between the second strip patch (32) and the first strip patch (31) of each reflective unit in another region is _____. Arbitrary linear polarization can be synthesized by adjusting the phase of left-handed and right-handed circular polarization.

2. The ultra-wideband dual-polarized reflective array antenna according to claim 1, characterized in that: A support layer (21) is provided between the coupling metal layer (10) and the first dielectric layer (20).

3. The ultra-wideband dual-polarized reflective array antenna according to claim 1, characterized in that: The first metal patch (311) is connected to the anode of the diode, and the second metal patch (312) is connected to the cathode of the diode. By controlling the on / off state of the diode on the first strip patch (31), the following can be achieved: The phase response of the polarized wave is achieved by controlling the on / off state of the diode on the second strip patch (32). Phase response of polarized waves.

4. The ultra-wideband dual-polarized reflective array antenna according to claim 1, characterized in that: The reflection unit has four coding states. These are states 00, 01, 10, and 11, respectively. for The response of the polarization channel for The polarization channel response is coded as 0 to indicate that the diode is off, and coded as 1 to indicate that the diode is on.

5. The ultra-wideband dual-polarized reflective array antenna according to claim 1, characterized in that: Based on the desired beam direction of the reflector antenna Calculate the first Phase of each unit The method is as follows: in, For free space wavenumber, For the array center and the first Position vectors between units The distance between the feed phase center and the array center. This serves as the global reference phase.

6. The ultra-wideband dual-polarized reflective array antenna according to claim 1, characterized in that: By setting the difference between the global reference phase of the second strip patch (32) and the first strip patch (31) of each reflective unit to be... The reflector array antenna radiates left-hand circularly polarized waves. The difference between the global reference phase of the second strip patch (32) and the first strip patch (31) of each reflector element is set to... The reflector array antenna radiates right-hand circularly polarized waves.

7. The ultra-wideband dual-polarized reflective array antenna according to claim 1, characterized in that: Polarization angle of a linearly polarized wave for: in, The phase difference between the left-hand circularly polarized wave and the right-hand circularly polarized wave. , For the phase of a left-hand circularly polarized wave, This represents the phase of a right-hand circularly polarized wave.

8. The ultra-wideband dual-polarized reflective array antenna according to claim 1, characterized in that: Polarization angle of a linearly polarized wave The relationship with the global reference phase is as follows: in, To adjust the polarization component in the region of left-hand circularly polarized radiation The global reference phase of the far-field radiation pattern. To adjust the polarization component in the region of left-hand circularly polarized radiation The global reference phase of the far-field radiation pattern. To adjust the polarization component in the region of right-hand circularly polarized radiation The global reference phase of the far-field radiation pattern. To adjust the polarization component in the region of right-hand circularly polarized radiation Global reference phase and polarization components of the far-field pattern and polarization components For the two components of the spherical coordinate system, A constant factor, The polarization angle is the polarization angle of the linearly polarized wave.

9. A method for arbitrary linear polarization synthesis of an ultra-wideband dual-polarization reflective array antenna, characterized in that: The method using the ultra-wideband dual-polarized reflector array antenna according to any one of claims 1-8 includes: The reflector array antenna is divided into region one and region two, and the encoding under four global reference phases is calculated for each region. The four global reference phases are the global reference phases of the first strip patch (31) of each reflector element in region one. Global reference phase of the second strip patch (32) and the global reference phase of the first strip patch (31) of each reflective unit in region two. Global reference phase of the second strip patch (32) ; Select the required mask based on the desired polarization. When the mask value is 1, select the code in region one; when the mask value is 0, select the code in region two to generate the required code.

Images