Metasurface unit and its base station

Abstract

The present invention provides a metasurface unit and a base station thereof, wherein the metasurface unit includes: a resonance unit, the resonance unit is used to receive two polarized incident signals, or radiate two polarized reflected signals; a power divider, the power divider is connected to the resonance unit, the power divider is used to combine the two polarized incident signals input by the resonance unit into a combined signal, and / or, to divide the input reflected signal into two polarized reflected signals and output them to the resonance unit; a phase shifter, the phase shifter is connected to the power divider, the phase shifter is used to phase-modulate the combined signal input by the power divider, and output the reflected signal obtained by phase modulation to the power divider. According to the technical solution of this embodiment, the combination and division of the two polarized signals are realized by the power divider, so that the two polarized signals can share the same phase shifter, which effectively reduces the number of phase shifters and reduces the hardware cost.

Description

Technical Field

[0001] The present invention relates to but is not limited to the field of communications, and in particular to a metasurface unit and a base station thereof. Background Art

[0002] An artificial electromagnetic metasurface is a periodically arranged array of units that can change the propagation characteristics of electromagnetic waves and achieve certain special functions. For example, by designing a specific phase difference between the reflected wave and the incident wave of each unit, the unit array can achieve the electromagnetic beamforming function at a specific angle. The traditional artificial electromagnetic metasurface is a static structure whose electromagnetic characteristics cannot be changed and cannot meet today's communication needs. In recent years, the concept of programmable metasurfaces has been proposed. An RF switch is loaded on the resonant unit of the metasurface unit. The resonant frequency of the signal is adjusted through the different states of the RF switch, and the reflection phase is regulated, so that the metasurface presents dynamic electromagnetic characteristics, thereby realizing programmable multi-beamforming functions.

[0003] The parameter fluctuation of the RF switch can easily cause the resonant frequency of the resonant unit to shift, affecting the phase modulation accuracy of the metasurface unit. To solve this problem, a combination of a resonant unit and a phase shifter is usually used, and the RF switch is set in the phase shifter. Although the separation of the resonant unit and the RF switch is achieved, a phase shifter needs to be configured for each polarization signal, which has a high hardware cost. Summary of the invention

[0004] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0005] The embodiment of the present invention provides a metasurface unit and a base station thereof, which can effectively reduce the number of phase shifters and reduce the hardware cost of the metasurface unit.

[0006] In a first aspect, an embodiment of the present invention provides a metasurface unit, comprising:

[0007] A resonance unit, the resonance unit being used to receive two polarized incident signals, or to radiate two polarized reflected signals;

[0008] A power divider, the power divider is connected to the resonance unit, and the power divider is used to combine the two polarized incident signals input by the resonance unit into a combined signal, and / or to divide the input reflected signal into two polarized reflected signals and output them to the resonance unit;

[0009] A phase shifter, the phase shifter is connected to the power divider, the phase shifter is used to phase modulate the combined signal input by the power divider, and output the reflected signal obtained by phase modulation to the power divider.

[0010] In a second aspect, an embodiment of the present invention provides a base station, comprising: a metasurface unit as described in the first aspect.

[0011] The embodiment of the present invention includes: a resonance unit, the resonance unit is used to receive two polarized incident signals, or radiate two polarized reflected signals; a power divider, the power divider is connected to the resonance unit, the power divider is used to combine the two polarized incident signals input by the resonance unit into a combined signal, and / or, to split the input reflected signal into two polarized reflected signals and output them to the resonance unit; a phase shifter, the phase shifter is connected to the power divider, the phase shifter is used to phase modulate the combined signal input by the power divider, and output the reflected signal obtained by phase modulation to the power divider. According to the technical solution of this embodiment, the combination and splitting of two polarized signals are realized by the power divider, so that the two polarized signals can share the same phase shifter, which effectively reduces the number of phase shifters in the metasurface unit and reduces the hardware cost.

[0012] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0014] Figure 1 is a schematic diagram of a metasurface unit provided in Embodiment 1 of the present invention;

[0015] Figure 2 is a front view of a power divider provided in Embodiment 1 of the present invention;

[0016] Figure 3 is an internal structure diagram of a phase shifter provided in Embodiment 1 of the present invention;

[0017] Figure 4 is an internal structure diagram of a phase shifter provided in Embodiment 2 of the present invention;

[0018] Figure 5 is an internal structure diagram of a phase shifter provided in Embodiment 3 of the present invention;

[0019] Figure 6 2 is a schematic diagram of the 2-bit reflection amplitude of the metasurface unit under the infinite periodic boundary of an embodiment of the present invention;

[0020] Figure 7It is a schematic diagram of the 2-bit reflection phase of the metasurface unit of an embodiment of the present invention under the infinite periodic boundary. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] It should be noted that, although the functional modules are divided in the device schematic, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims or the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0023] The present invention provides a metasurface unit and a base station thereof, wherein the metasurface unit includes: a resonance unit, the resonance unit is used to receive two polarized incident signals, or radiate two polarized reflected signals; a power divider, the power divider is connected to the resonance unit, the power divider is used to combine the two polarized incident signals input by the resonance unit into a combined signal, and / or, to divide the input reflected signal into two polarized reflected signals and output them to the resonance unit; a phase shifter, the phase shifter is connected to the power divider, the phase shifter is used to phase-modulate the combined signal input by the power divider, and output the reflected signal obtained by the phase modulation to the power divider. According to the technical solution of this embodiment, the combination and division of the two polarized signals are realized by the power divider, so that the two polarized signals can share the same phase shifter, which effectively reduces the number of phase shifters in the metasurface unit and reduces the hardware cost.

[0024] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0025] Reference Figure 1 The present invention provides a metasurface unit, comprising:

[0026] A resonance unit 100, the resonance unit 100 is used to receive two polarized incident signals, or to radiate two polarized reflected signals;

[0027] A power divider 200, the power divider 200 is connected to the resonance unit 100, and the power divider 200 is used to combine the two polarized incident signals input by the resonance unit 100 into a combined signal, and / or to divide the input reflected signal into two polarized reflected signals and output them to the resonance unit 100;

[0028] The phase shifter 300 is connected to the power divider 200 . The phase shifter 300 is used to perform phase modulation on the combined signal input by the power divider 200 , and output the reflected signal obtained by the phase modulation to the power divider 200 .

[0029] It should be noted that in the working frequency band of the metasurface unit, the resonance unit 100 can realize a dual-polarization working mode, that is, the resonance unit 100 can receive two polarized incident electromagnetic wave signals in the space through resonance, and then synthesize the two polarized incident signals into a combined signal through the power divider 200. After the combined signal is input to the phase shifter 300 for phase modulation, the signal is reflected back to the power divider 200, and the reflected signal is divided into two polarized reflected signals in the power divider 200, which are radiated out in the form of electromagnetic waves through the resonance unit 100 to form a reflected wave.

[0030] It should be noted that, through the structure of the metasurface unit of this embodiment, the phase shifter 300 and the resonance unit 100 are independent devices, and the device parameters of the phase shifter 300 will not affect the resonance frequency of the resonance unit 100, effectively ensuring the phase modulation accuracy, so that the metasurface unit can be applied to all frequency bands. In addition, the resonance unit 100 adopts a dual-polarization design, and the two polarization signals of different polarizations are combined through the power divider 200 and then connected to the phase shifter 300. The two polarization signals share a phase shifter 300 for phase modulation. In the case of supporting the dual-polarization mode, the effect of halving the phase shifter 300 in the metasurface unit is achieved, effectively reducing the hardware cost.

[0031] Various embodiments of the super surface unit are described below through several embodiments.

[0032] Embodiment 1:

[0033] In this embodiment, refer to Figure 1 , the resonance unit 100, the power divider 200 and the phase shifter 300 are all independent devices, the resonance unit 100 includes a first polarization port 101 and a second polarization port 102, the power divider 200 includes a first power divider port 205 and a second power divider port 204, the first polarization port 101 is connected to the first power divider port 205, and the second polarization port 102 is connected to the second power divider port 204; the power divider 200 also includes a third power divider port 203, the phase shifter 300 includes a phase shifter port 311, and the third power divider port 203 is connected to the phase shifter port 311;

[0034] The resonance unit 100 is used to receive a first polarized incident signal and a second polarized incident signal, and input the first polarized incident signal to the first power divider port 205 through the first polarized port 101, and input the second polarized incident signal to the second power divider port 204 through the second polarized port 102, wherein the polarization directions of the first polarized incident signal and the second polarized incident signal are orthogonal to each other; the resonance unit 100 is also used to radiate a first polarized reflected signal and a second polarized reflected signal, wherein the polarization directions of the first polarized reflected signal and the second polarized reflected signal are orthogonal to each other, the first polarized reflected signal is input by the power divider 200 through the first power divider port 205, and the second polarized reflected signal is input by the power divider 200 through the second power divider port 204;

[0035] The power divider 200 is used to combine the first polarized incident signal and the second polarized incident signal into a combined signal, and input the combined signal to the phase shifter 300 through the third power divider port 203, so that the phase shifter 300 performs phase modulation on the combined signal to obtain a reflected signal; the power divider 200 is also used to obtain the reflected signal input by the phase shifter 300 through the phase shifter port 311, and split the reflected signal into a first polarized reflected signal and a second polarized reflected signal.

[0036] It should be noted that the resonance unit 100 may be a microstrip antenna unit or a dipole antenna unit, or may be other radiation units with a resonance function. This embodiment does not impose too many restrictions on the specific device selection of the resonance unit 100.

[0037] It is worth noting that in order to realize the dual-polarization working model, the polarized incident signal received by the resonance unit 100 and the polarized output signal radiated can be polarized signals with two polarization directions orthogonal to each other. For example, the first polarized incident signal can be an electromagnetic wave signal with a polarization direction of 45 degrees in space, and the second polarized incident signal can be an electromagnetic wave signal with a polarization direction of negative 45 degrees in space. The combined signal is obtained by combining the power divider 200 and then input to the phase shifter 300 for phase modulation. The obtained reflected signal is divided into a first polarized reflected signal with a polarization direction of 45 degrees and a second polarized reflected signal with a polarization direction of negative 45 degrees in the power divider 200, and then radiated out in the form of electromagnetic waves through the resonance unit 100 to form a reflected wave. The polarization direction described in the above example is not a limitation on the technical solution of this embodiment, and it is sufficient to ensure that the polarization directions of the two polarized signals input and output are orthogonal to each other.

[0038] It is worth noting that the reflected signal of this embodiment can be a signal obtained after phase modulation of the first polarized incident signal, or a signal obtained after phase modulation of the second polarized incident signal. In this embodiment, the metasurface unit uses a power divider 200 to split the reflected signal, so that the first polarized incident signal with a polarization direction of 45 degrees can be phase modulated to obtain a first polarized reflected signal with a polarization direction of 45 degrees and a second polarized reflected signal with a polarization direction of negative 45 degrees, which effectively enriches the types of signal polarization. Of course, the processing process for the second polarized incident signal with a polarization direction of negative 45 degrees is similar, and will not be repeated here.

[0039] It should be noted that the power divider 200 may be a Wilkinson power divider, a 3dB bridge, a T-junction, or an integrated component with a power distribution function. This embodiment does not impose too many restrictions on the specific device selection of the power divider 200.

[0040] It should be noted that the phase shifter 300 can be a device consisting of multiple transmission lines and RF switches, each transmission line segment is connected by an RF switch, so that the multiple transmission lines are connected in series or in parallel, and different phase shifting effects are achieved by combining the states of the RF switches. Of course, it can also be an integrated component with a phase shifting function. This embodiment does not impose too many restrictions on the specific structure of the phase shifter 300.

[0041] In addition, refer to Figure 2 , the power divider 200 further includes a power divider transmission line 201 and an isolation resistor 202, the power divider transmission line 201 is respectively connected to the first power divider port 205, the second power divider port 204 and the third power divider port 203;

[0042] The isolation resistor 202 is disposed between a first segment line and a second segment line of the power divider transmission line 201 , wherein the first segment line is used to connect the first power divider port 205 , and the second segment line is used to connect the second power divider port 204 .

[0043] It should be noted that Figure 2 The structure of the power divider 200 shown is a Wilkinson power divider. When receiving electromagnetic waves, the resonance unit 100 inputs two polarized incident signals through the first power divider port 205 and the second power divider port 204 respectively, and the signal is combined through the power divider 200. Similarly, when transmitting electromagnetic waves, the phase shifter 300 inputs the reflected signal through the third power divider port 203, and the power divider 200 distributes the reflected signal to the two polarizations of the resonance unit, thereby realizing the radiation of two polarized signals.

[0044] It should be noted that the power divider transmission line 201 can be Figure 2The stripline structure shown connects the first power divider port 205, the second power divider port 204 and the third power divider port 203 respectively, and an isolation resistor 202 is set between the first segment line connected to the first power divider port 205 and the second segment line connected to the second power divider port 204. In order to achieve isolation of two polarized signals, the isolation resistor 202 can be a surface-mount resistor, and the specific resistance value can be adjusted according to actual needs.

[0045] In addition, refer to Figure 3 The phase shifter 300 also includes a DC blocking capacitor 302, a radio frequency switch module and an AC blocking inductor 308 connected in series in sequence, and the DC blocking capacitor 302 is connected to the phase shifter port 311; the phase shifter 300 includes a first phase shifter transmission line 301, a second phase shifter transmission line 304, a third phase shifter transmission line 305 and a fourth phase shifter transmission line 307, and the radio frequency switch module includes a first radio frequency switch 310, a second radio frequency switch 309 and a third radio frequency switch 306; the DC blocking capacitor 302 and the first radio frequency switch 31 0 is connected through a first phase shifter transmission line 301, a first RF switch 310 and a second RF switch 309 are connected in series through a second phase shifter transmission line 304, the second RF switch 309 and a third RF switch 306 are connected in series through a third phase shifter transmission line 305, and the third RF switch 306 and an AC isolation inductor 308 are connected through a fourth phase shifter transmission line 307; the first phase shifter transmission line 301, the second phase shifter transmission line 304 and the third phase shifter transmission line 305 are respectively connected to a DC bias line 303.

[0046] It should be noted that, in this embodiment, the first phase shifter transmission line 301, the second phase shifter transmission line 304, the third phase shifter transmission line 305 and the fourth phase shifter transmission line 307 are connected in series through three RF switches to form a complete transmission line. The above transmission lines can adopt microstrip line or stripline structure, which can be selected according to actual needs.

[0047] It is worth noting that the DC blocking capacitor 302 can isolate the DC current to prevent the bias current from entering the power divider 200, and the AC blocking inductor 308 can isolate the RF signal to prevent the RF signal from entering the bias circuit 303. The DC blocking capacitor 302 and the AC blocking inductor 308 can be chip devices or distributed capacitors and distributed inductors, and the specific types and parameters can be selected according to actual needs.

[0048] It should be noted that the three RF switches of this embodiment can be PIN tubes, or varactor diodes, triodes, field effect transistors, single-pole single-throw switches / single-pole multiple-throw switches, etc. This embodiment does not impose too many restrictions on the specific selection of RF switches.

[0049] It should be noted that in the phase shifter 300 of this embodiment, three RF switches are connected through the first phase shifter transmission line 301, the second phase shifter transmission line 304 and the third phase shifter transmission line 305 to realize the series connection of the phase shifter transmission lines, and four phases, namely 2-bit phase states, can be realized through different states of the three RF switches, which can effectively improve the phase quantization accuracy and has good scalability. For example, the combined signal is input through the phase shifter port 311, and enters the RF switch module after passing through the DC blocking capacitor 302. The combined signal passes through the RF switch that is opened once until it is reflected at an open or short-circuited terminal. Different combinations of the opening states of the three RF switches can achieve four states, among which, when all three RF switches are closed, the combination state is "00", and the corresponding reflection phase is 0 degree; when the first RF switch 310 is turned on, the combination state is "01", and the corresponding reflection phase is negative 90 degrees; when the first RF switch 310 and the second RF switch 309 are turned on, the combination state is "10", and the corresponding reflection phase is negative 180 degrees; when the first RF switch 310, the second RF switch 309 and the third RF switch 306 are turned on, the combination state is "11", and the corresponding reflection phase is negative 270 degrees. The reflection amplitude schematic diagram obtained by using the metasurface unit of this embodiment can be referred to Figure 6 As shown, at the horizontal axis of 2.5 GHz, the four curves correspond to the combination states "00", "01", "11" and "10" from top to bottom; the schematic diagram of the reflection phase can be referred to Figure 7 As shown, at the horizontal axis of 2.5 GHz, the four curves correspond to the combination states "00", "01", "10" and "11" from top to bottom; Figure 6 and Figure 7 It can be seen that the reflection phase and reflection amplitude are different in different combination states, the metasurface unit has strong scalability and high phase quantization accuracy.

[0050] Embodiment 2:

[0051] The metasurface unit of this embodiment is similar to that of the first embodiment, with the following main differences:

[0052] Reference Figure 4 , the phase shifter 300 includes a first phase shifter transmission line 301, a second phase shifter transmission line 304, a third phase shifter transmission line 305, a fourth phase shifter transmission line 307 and a fifth phase shifter transmission line 313, the RF switch module includes a third RF switch 306 and an RF switch group 312, and the RF switch group 312 includes a first RF switch 310 and a second RF switch 309;

[0053] The DC blocking capacitor 302 and the first RF switch 310 are connected through the first phase shifter transmission line 301, the first RF switch 310 and the second RF switch 309 are connected in parallel through the second phase shifter transmission line 304 and the fifth phase shifter transmission line 313, the second RF switch 309 and the third RF switch 306 are connected in series through the third phase shifter transmission line 305, and the third RF switch 306 and the AC blocking inductor 308 are connected through the fourth phase shifter transmission line 307.

[0054] It should be noted that, in the RF switch module of this embodiment, the second phase shifter transmission line 304 and the fifth phase shifter transmission line 313 are connected in parallel, and a 2-bit phase response can also be achieved through different states of the three RF switches. The difference is that the setting direction of the second RF switch 309 in this embodiment is different from the setting direction of the second RF switch 309 in the first embodiment, and two DC blocking capacitors 302 and a bias circuit 303 are adaptively set at the fifth phase shifter transmission line 313. The difference between this embodiment and the first embodiment is that the connection method of the RF switch and the transmission line is different. Otherwise, the principles are roughly the same and will not be repeated here.

[0055] Embodiment three:

[0056] The metasurface unit of this embodiment is similar to that of the second embodiment, with the following main differences:

[0057] Reference Figure 5 The radio frequency switch module includes at least two radio frequency switch groups 312 connected in series.

[0058] It should be noted that, based on the second embodiment, this embodiment adds an RF switch group 312, so that the phase shifter 300 can realize an 8-bit phase state through 5 RF switches, further improving the accuracy of phase adjustment. The principle that the switching state of the 5 RF switches determines the reflection phase is similar to that of the second embodiment, and only one bit is added to describe the 8-bit state. For example, the combination state in the fully closed state is "000", and in the fully open state is "111". For the sake of simplicity, it is not repeated here.

[0059] In addition to the above differences, other parts of the super-surface unit of this embodiment can refer to the description of the second embodiment, and will not be repeated here for the sake of simplicity.

[0060] In addition, the present invention also provides an optoelectronic device, comprising a metasurface unit as described in any of the above embodiments.

[0061] It should be noted that after any of the metasurface units in the above embodiments is applied to the base station, since a power divider is provided in the metasurface unit, in the dual-polarization mode, the two polarization signals share one phase shifter, which effectively reduces the number of phase shifters and reduces the hardware cost.

[0062] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A metasurface unit, characterized in that: include: A resonance unit, the resonance unit being used to receive two polarized incident signals, or to radiate two polarized reflected signals; A power divider, the power divider is connected to the resonance unit, the power divider is used to combine the two polarized incident signals input by the resonance unit into a combined signal, and / or to divide the input reflected signal into two polarized reflected signals and output them to the resonance unit, wherein the polarization directions of the two polarized incident signals are orthogonal to each other, and the polarization directions of the two polarized reflected signals are orthogonal to each other; A phase shifter, the phase shifter is connected to the power divider, the phase shifter is used to phase modulate the combined signal input by the power divider, and output the reflected signal obtained by phase modulation to the power divider.

2. The metasurface unit according to claim 1, characterized in that: The resonance unit includes a first polarization port and a second polarization port, the power divider includes a first power divider port and a second power divider port, the first polarization port is connected to the first power divider port, and the second polarization port is connected to the second power divider port; The resonance unit is used to receive a first polarized incident signal and a second polarized incident signal, and input the first polarized incident signal to the first power divider port through the first polarized port, and input the second polarized incident signal to the second power divider port through the second polarized port, wherein polarization directions of the first polarized incident signal and the second polarized incident signal are orthogonal to each other; The resonance unit is also used to radiate a first polarized reflected signal and a second polarized reflected signal, wherein the polarization directions of the first polarized reflected signal and the second polarized reflected signal are orthogonal to each other, the first polarized reflected signal is input by the power divider through the first power divider port, and the second polarized reflected signal is input by the power divider through the second power divider port.

3. The metasurface unit according to claim 2, characterized in that: The power divider further includes a third power divider port, the phase shifter includes a phase shifter port, and the third power divider port is connected to the phase shifter port; The power divider is used to combine the first polarized incident signal and the second polarized incident signal into the combined signal, and input the combined signal to the phase shifter through the third power divider port, so that the phase shifter performs phase modulation on the combined signal to obtain the reflected signal; The power divider is further used to obtain the reflected signal input by the phase shifter through the phase shifter port, and split the reflected signal into the first polarization reflected signal and the second polarization reflected signal.

4. The metasurface unit according to claim 3, characterized in that: The power divider further includes a power divider transmission line and an isolation resistor, wherein the power divider transmission line is respectively connected to the first power divider port, the second power divider port and the third power divider port; The isolation resistor is arranged between a first segment line and a second segment line of the power divider transmission line, wherein the first segment line is used to connect the first power divider port, and the second segment line is used to connect the second power divider port.

5. The metasurface unit according to claim 3, characterized in that: The phase shifter also includes a DC blocking capacitor, a radio frequency switch module and an AC blocking inductor connected in series in sequence. The DC blocking capacitor is connected to the phase shifter port. The radio frequency switch module is used to phase modulate the combined signal to obtain the reflected signal.

6. The metasurface unit according to claim 5, characterized in that: The phase shifter includes a first phase shifter transmission line, a second phase shifter transmission line, a third phase shifter transmission line and a fourth phase shifter transmission line, and the RF switch module includes a first RF switch, a second RF switch and a third RF switch; The DC blocking capacitor and the first RF switch are connected through the first phase shifter transmission line, the first RF switch and the second RF switch are connected in series through the second phase shifter transmission line, the second RF switch and the third RF switch are connected in series through the third phase shifter transmission line, and the third RF switch and the AC blocking inductor are connected through the fourth phase shifter transmission line.

7. The metasurface unit according to claim 6, characterized in that: The first phase shifter transmission line, the second phase shifter transmission line and the third phase shifter transmission line are respectively connected to a DC bias line.

8. The metasurface unit according to claim 5, characterized in that: The phase shifter includes a first phase shifter transmission line, a second phase shifter transmission line, a third phase shifter transmission line, a fourth phase shifter transmission line and a fifth phase shifter transmission line, the RF switch module includes a third RF switch and an RF switch group, and the RF switch group includes a first RF switch and a second RF switch; The DC blocking capacitor and the first RF switch are connected through the first phase shifter transmission line, the first RF switch and the second RF switch are connected in parallel through the second phase shifter transmission line and the fifth phase shifter transmission line, the second RF switch and the third RF switch are connected in series through the third phase shifter transmission line, and the third RF switch and the AC blocking inductor are connected through the fourth phase shifter transmission line.

9. The metasurface unit according to claim 8, characterized in that: The second phase shifter transmission line and the fifth phase shifter transmission line are respectively connected to a DC bias line.

10. The metasurface unit according to claim 8, characterized in that: The radio frequency switch module includes at least two radio frequency switch groups connected in series.

11. A base station, characterized in that: Comprising a super surface unit as described in any one of claims 1 to 10.

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