Frequency reconfigurable liquid crystal phase shift antenna unit suitable for phased array system

Abstract

The utility model discloses a frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system. The frequency reconfigurable liquid crystal phase shift antenna unit comprises a first-layer dielectric substrate; the second-layer dielectric substrate and the first-layer dielectric substrate are oppositely arranged in parallel in the vertical direction; the third-layer dielectric substrate and the second-layer dielectric substrate are relatively arranged in parallel in the vertical direction; the first liquid crystal layer is filled between the first dielectric substrate and the second dielectric substrate; the second liquid crystal layer is filled between the second dielectric substrate and the third dielectric substrate; the first supporting structure is vertically arranged between the first dielectric substrate and the second dielectric substrate; the second supporting structure is vertically arranged between the second dielectric substrate and the third dielectric substrate; the first grounding electrode layer is printed on the upper surface of the first dielectric substrate layer; the strip line phase shifter is printed on the lower surface of the second dielectric substrate; the second grounding electrode layer is printed on the upper surface of the second dielectric substrate; and the radiation patch is printed on the lower surface of the third-layer dielectric substrate. According to the utility model, the wide-angle phase shift and frequency reconfigurable characteristics can be realized, and the antenna is suitable for a phased array system.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communications, in particular to a frequency reconfigurable liquid crystal phase-shift antenna unit suitable for a phased array system. Background Art

[0002] With the development of communication technology, people's demand for large-capacity and high-speed communications is gradually increasing. Therefore, higher requirements are placed on the performance and complexity of communication systems. Phase shifters are key components in T / R components, and device performance, size, power consumption and other indicators play a decisive role in the overall performance. Traditional phase shifters achieve phase shifting by switching the length of the transmission line, or use reflective phase shifters, variable capacitor phase shifters and dielectric adjustable phase shifters. These phase shifters require the introduction of electronic devices such as RF switches, variable capacitors or diodes to increase the phase shift range, and have disadvantages such as high loss, low power capacity and large size.

[0003] With the development of high-performance liquid crystal materials, liquid crystal materials provide an effective solution for low-cost, low-loss, and miniaturized phase shifter design. As a dielectric tunable material, liquid crystal in the liquid crystal box rotates under the action of the electric field formed between the microstrip line and the ground electrode, and the dielectric constant of the liquid crystal changes, thereby realizing the phase shift characteristics of the transmission signal in the liquid crystal phase shifter.

[0004] Reconfigurable antennas are of great significance in the application of intelligent miniaturized wireless communication systems. They can replace the need for multiple channels, improve system reliability, and reduce size, weight, complexity, and cost by adjusting the center frequency, bandwidth, gain, and other performance of the antenna through control circuits. Liquid crystal is a dielectric tunable material. Liquid crystal material is used as the dielectric substrate of the antenna. By applying different bias voltages between the antenna and the ground electrode, the dielectric constant of the liquid crystal material will change, thereby adjusting the antenna operating frequency and realizing the frequency reconfiguration characteristics of the antenna.

[0005] In recent years, some patents have disclosed some technical solutions of liquid crystal antennas, which are compared with the existing technology, including:

[0006] The Chinese patent with the patent number CN13594690B discloses "a liquid crystal phased array antenna", which adopts a plurality of groups of left-handed electrode pairs placed above the liquid crystal material layer, and forms metal resonant gaps corresponding to the plurality of groups of left-handed electrode pairs below the liquid crystal layer, thereby forming a miniaturized antenna unit, adopts a waveguide cavity for signal transmission, and controls the deflection state of the liquid crystal molecules by adjusting the bias voltage of the liquid crystal, thereby realizing the regulation of the phase;

[0007] The Chinese patent with patent number CN110970718A discloses "liquid crystal antenna unit and liquid crystal phased array antenna". The antenna unit uses a plurality of slender dipoles of different lengths placed on the dielectric substrate on both sides of the liquid crystal layer to form a radiation structure, and uses a coplanar waveguide transmission line to feed the antenna unit. The deflection of the liquid crystal molecules is controlled by applying a bias voltage between the electrode structure and the ground wire on both sides of the liquid crystal layer, thereby achieving control of the phase of the antenna unit.

[0008] The liquid crystal antennas proposed in the above patents all have good radiation performance, but can only be used in fixed frequency bands and do not have the reconfigurable characteristics of the operating frequency, so the application scenarios are limited. Utility Model Content

[0009] The utility model aims to solve the shortcomings in the prior art and proposes a frequency reconfigurable liquid crystal phase-shift antenna unit suitable for a phased array system.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] A frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system comprises a first dielectric substrate, a first grounding electrode layer, a first liquid crystal layer, a stripline phase shifter, a second dielectric substrate, a second grounding electrode layer, a second liquid crystal layer, a radiation patch and a third dielectric substrate, characterized in that the first dielectric substrate is located at the bottom layer, the second dielectric substrate is relatively parallel to the first dielectric substrate in a vertical direction, the third dielectric substrate is relatively parallel to the second dielectric substrate in a vertical direction, the first grounding electrode layer is printed on the side of the upper surface of the first dielectric substrate facing the first liquid crystal layer, the stripline phase shifter is printed on the side of the lower surface of the second dielectric substrate facing the first liquid crystal layer, the first liquid crystal layer is filled between the first dielectric substrate and the second dielectric substrate, the second grounding electrode layer is printed on the side of the upper surface of the second dielectric substrate facing the second liquid crystal layer, the radiation patch is printed on the side of the lower surface of the third dielectric substrate facing the second liquid crystal layer, and the second liquid crystal layer is filled between the second dielectric substrate and the third dielectric substrate.

[0012] Preferably, the stripline phase shifter is provided with a stripline delay line, the first grounding electrode layer and the second grounding electrode layer are used as reference grounds, and its structure consists of three parts: a main transmission line, a plurality of open-circuit branches and a coupling feed line.

[0013] Preferably, a plurality of periodic rectangular gaps are dug out from the first ground electrode layer to form a defective ground structure, and the plurality of periodic rectangular gaps are arranged in a planar spiral structure.

[0014] Preferably, the stripline phase shifter is implemented by a planar spiral structure, a plurality of open-circuit branches are perpendicularly intersected and connected to the main transmission line, and their projections are staggered with a plurality of periodic rectangular gaps on the first ground electrode layer.

[0015] Preferably, a plurality of first support columns are placed on both sides of the first liquid crystal layer, and the plurality of first support columns are vertically placed between the first dielectric substrate and the second dielectric substrate to support the first liquid crystal layer.

[0016] Preferably, a rectangular gap is dug out at the projection of the second ground electrode layer directly below the middle of the radiation patch.

[0017] Preferably, a plurality of second supporting columns are placed on both sides of the second liquid crystal layer, and the plurality of second supporting columns are vertically placed between the second dielectric substrate and the third dielectric substrate to support the second liquid crystal layer.

[0018] Preferably, the materials used for the first dielectric substrate, the second dielectric substrate, and the third dielectric substrate are glass or PCB printed boards. The three-layer dielectric substrate serves as the encapsulation of the first liquid crystal layer and the second liquid crystal layer. While supporting and stabilizing the liquid crystal molecules, it can also serve as a signal dielectric substrate by printing signal circuits on the upper and lower surfaces of the dielectric substrate.

[0019] Preferably, the materials used for the first ground electrode layer, the stripline phase shifter, the second ground electrode layer, and the radiation patch are all copper foil with a thickness of 18 um. The first ground electrode layer and the second ground electrode layer provide a reference ground for the stripline phase shifter. At the same time, the second ground electrode layer also serves as a reference ground for the antenna and provides coupling feeding for the antenna through the slots.

[0020] Preferably, the materials used for the first liquid crystal layer and the second liquid crystal layer are stable wide-temperature liquid crystals with a thickness of 50 um. The first liquid crystal layer serves as a dielectric tunable medium substrate for the stripline phase shifter, and the dielectric constant of the first liquid crystal layer is changed, thereby changing the transmission phase of the stripline to achieve a phase shift function; the second liquid crystal layer serves as a dielectric tunable medium substrate for the antenna, and the dielectric constant of the second liquid crystal layer is changed, thereby achieving adjustment of the antenna operating frequency. The shape of the radiation patch can be rectangular, circular or other shapes according to the actual application scenario to achieve specific performance.

[0021] In the utility model, a frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system adopts a double-layer liquid crystal material to realize the phase shift characteristic and frequency reconfigurable characteristic of the antenna unit. Liquid crystal is a tunable dielectric material, which is encapsulated between two layers of parallel metal electrodes coated with an orientation film, and a bias voltage is applied on both sides of the parallel metal plates. When the bias voltage value is greater than the starting threshold of the liquid crystal molecules and less than the saturation voltage, the liquid crystal molecules will show non-uniformity and dielectric anisotropy, and their dielectric constant will change. The first liquid crystal layer is used as a dielectric tunable layer dielectric substrate of the stripline phase shifter. By applying a bias voltage to the first ground electrode layer and the strip phase shifter layer located on the upper and lower sides of the first liquid crystal layer, the dielectric constant of the first liquid crystal layer is changed, thereby changing the transmission phase of the stripline and realizing the phase shift function; the second liquid crystal layer is used as a dielectric tunable layer dielectric substrate of the antenna. By applying a bias voltage between the second ground electrode layer and the radiation patch located on the upper and lower sides of the second liquid crystal layer, the dielectric constant of the second liquid crystal layer is changed, thereby realizing the adjustment of the antenna working frequency, and effectively expanding the working bandwidth of the antenna.

[0022] The frequency reconfigurable liquid crystal phase shift antenna unit of the utility model has large angle phase shift characteristics and reconfigurable working frequency characteristics. In the phase shifter part, the slow wave characteristics are generated by digging out periodic gaps in the first ground electrode layer below the stripline phase shifter, adding multiple open branches on the main transmission line to shorten the total length of the transmission line, and designing the phase shifter into a planar spiral structure can further reduce the occupied area, thereby realizing the miniaturization of the phase shifter. Therefore, the frequency reconfigurable liquid crystal phase shift antenna unit of the utility model has the advantages of miniaturization, large phase shift, adjustable frequency, low profile, and easy integration with the system, and is suitable for phased array systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a 3D schematic diagram of a frequency reconfigurable liquid crystal phase-shifting antenna unit suitable for a phased array system of the utility model;

[0024] Figure 2 This is a side view of a frequency reconfigurable liquid crystal phase-shifting antenna unit suitable for a phased array system of the utility model;

[0025] Figure 3 This is a top view of a frequency reconfigurable liquid crystal phase shift antenna unit phase shifter suitable for a phased array system of the utility model;

[0026] Figure 4 This is a design flow chart of a frequency reconfigurable liquid crystal phase-shift antenna unit suitable for a phased array system of the utility model;

[0027] Figure 5 The utility model is a frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system, and a phase shifter return loss curve;

[0028] Figure 6 The utility model is a frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system, and the phase shifter insertion loss curve;

[0029] Figure 7 The utility model is a frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system, and a phase change curve of a phase shifter;

[0030] Figure 8 The utility model is a frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system, and the frequency reconfigurable antenna has a two-dimensional radiation pattern;

[0031] Fig. 9 The utility model discloses a curve of return loss versus dielectric constant variation of a frequency reconfigurable liquid crystal phase-shift antenna unit suitable for a phased array system.

[0032] In the figure: 1 first dielectric substrate, 2 first ground electrode layer, 21 periodic rectangular gap, 3 first liquid crystal layer, 4 stripline phase shifter, 41 main transmission line, 42 open branch, 43 coupling feed line, 5 second dielectric substrate, 6 second ground electrode layer, 61 rectangular gap, 7 second liquid crystal layer, 8 radiation patch, 9 third dielectric substrate. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0034] Reference Figure 1-9 A frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system comprises a first dielectric substrate 1, a first grounding electrode layer 2, a first liquid crystal layer 3, a stripline phase shifter 4, a second dielectric substrate 5, a second grounding electrode layer 6, a second liquid crystal layer 7, a radiation patch 8 and a third dielectric substrate 9, characterized in that the first dielectric substrate 1 is located at the bottom layer, the second dielectric substrate 5 is relatively parallel to the first dielectric substrate 1 in a vertical direction, the third dielectric substrate 9 is relatively parallel to the second dielectric substrate 5 in a vertical direction, the first grounding electrode layer 2 is printed on the upper surface of the first dielectric substrate 1 facing the side of the first liquid crystal layer 3, the stripline phase shifter 4 is printed on the lower surface of the second dielectric substrate 5 facing the side of the first liquid crystal layer 3, the first liquid crystal layer 3 is filled between the first dielectric substrate 1 and the second dielectric substrate 5, the second grounding electrode layer 6 is printed on the upper surface of the second dielectric substrate 5 facing the side of the second liquid crystal layer 7, the radiation patch 8 is printed on the lower surface of the third dielectric substrate 9 facing the side of the second liquid crystal layer 7, and the second liquid crystal layer 7 is filled between the second dielectric substrate 5 and the third dielectric substrate 9.

[0035] In the utility model, the stripline phase shifter 4 is provided with a stripline delay line, which is used to realize the phase shift function. The first ground electrode layer 2 and the second ground electrode layer 6 are used as reference grounds. Its structure consists of three parts: a main transmission line 41, a plurality of open branches 42 and a coupling feed line 43. The impedance matching characteristics of the antenna can be improved by adjusting the length of the coupling feed line 43.

[0036] In the present invention, a plurality of periodic rectangular slots 21 are dug out from the first ground electrode layer 2 to form a defective ground structure. In order to further reduce the occupied area of ​​the phase shifter, the plurality of periodic rectangular slots 21 are arranged in a planar spiral structure.

[0037] In the utility model, the stripline phase shifter 4 is implemented by a planar spiral structure, and a plurality of open branches 42 are vertically intersected and connected with the main transmission line 41, and their projections are staggered with a plurality of periodic rectangular slots 21 on the first ground electrode layer 2. The slow wave effect formed by the periodic slots 21 on the first ground electrode layer 2 and the open branches 42 of the stripline 4 can further expand the phase shift amount of the phase shifter, and the length of the delay line can be shortened for the characteristic phase shift angle, thereby reducing the loss of the phase shifter.

[0038] In the present invention, a plurality of first support columns 31 are placed on both sides of the first liquid crystal layer 3 , and the plurality of first support columns 31 are vertically placed between the first dielectric substrate 1 and the second dielectric substrate 5 to support the first liquid crystal layer 3 .

[0039] In the present invention, a rectangular gap 61 is dug out at the projection of the middle of the second ground electrode layer 6 corresponding to the radiation patch 8 .

[0040] In the present invention, a plurality of second support columns 71 are placed on both sides of the second liquid crystal layer 7 , and the plurality of second support columns 71 are vertically placed between the second dielectric substrate 5 and the third dielectric substrate 9 to support the second liquid crystal layer 7 .

[0041] In the utility model, the materials used for the first dielectric substrate 1, the second dielectric substrate 5, and the third dielectric substrate 9 are glass or PCB printed boards with relatively high flatness.

[0042] In the present invention, the materials used for the first ground electrode layer 2, the stripline phase shifter 4, the second ground electrode layer 6, and the radiation patch 8 are all copper foils with a thickness of 18 um.

[0043] In the present invention, the material used for the first liquid crystal layer 3 and the second liquid crystal layer 7 is a stable wide-temperature liquid crystal with a thickness of 50 um.

[0044] In the present invention, the shape of the radiation patch 8 can be rectangular, circular or other shapes according to the actual application scenario to achieve specific performance.

[0045] In order to further illustrate the good performance of the frequency reconfigurable liquid crystal phase-shifting antenna unit suitable for a phased array system of the utility model, modeling and simulation are performed on this embodiment. Figure 4 It is a design flow chart. The specific design process is as follows:

[0046] 1. Determine the operating frequency band of the liquid crystal phase shift antenna unit. This embodiment operates in the Ka band.

[0047] 2. Determine the scanning angle of the antenna and calculate the maximum phase shift range required by the phase shifter based on the scanning angle;

[0048] 3. Liquid crystal phase shifter design: First, determine the stacking structure of the liquid crystal phase shifter. This embodiment adopts a strip delay line structure. The first liquid crystal layer serves as the dielectric adjustable medium substrate of the strip line. The first dielectric substrate and the second dielectric substrate serve as the encapsulation of the first liquid crystal layer and the dielectric substrate of the signal line. The initial length of the strip line is calculated according to the phase shift range of the phase shifter. In order to further shorten the length of the strip line, multiple open branches are added to the strip line and multiple periodic rectangular gaps are dug out from the first ground electrode layer below the strip line. The multiple open branches are equally spaced and placed vertically to the strip line. The multiple periodic rectangular gaps and the projections of the multiple open branches on the first ground electrode layer are staggered. In order to reduce the occupied area of ​​the phase shifter, the phase shifter is bent into a planar spiral structure and the performance of the phase shifter is optimized. A bias voltage is applied between the strip line phase shifter layer and the first ground electrode layer to change the dielectric constant of the first liquid crystal layer and check the phase shift range of the phase shifter.

[0049] 4. Design of frequency reconfigurable antenna unit: First, determine the stacking structure of the antenna. In this embodiment, the antenna unit adopts a coupled feeding method. The second liquid crystal layer serves as the dielectric adjustable dielectric substrate of the antenna unit. The second dielectric substrate and the third dielectric substrate serve as the encapsulation of the second liquid crystal layer and the dielectric substrate of the antenna. The initial size of the antenna radiation patch is calculated according to the operating frequency band. In order to realize the slot coupled feeding method, a rectangular gap is dug on the second ground electrode layer directly below the antenna unit. The length of the coupling feed line and the size of the rectangular gap are optimized to achieve good performance of the antenna. A bias voltage is applied between the second ground electrode layer and the radiation patch, the dielectric constant of the second liquid crystal layer is changed, and the change of the operating frequency of the antenna unit is checked.

[0050] 5. The phase shifter and antenna are integrated into a design that integrates the stripline liquid crystal phase shifter and the frequency reconfigurable antenna unit to optimize the overall performance of the liquid crystal phase shift antenna unit. By controlling the bias voltage applied to the first liquid crystal layer and the second liquid crystal layer respectively, the antenna operating frequency can be adjusted and the radiation phase can be changed.

[0051] Figure 5 The utility model is a frequency reconfigurable liquid crystal phase shift antenna unit suitable for phased array system, the phase shifter return loss curve, from Figure 5 It can be seen that when the dielectric constant of the first liquid crystal layer is adjusted from 2.7 to 3.9, the return loss of the phase shifter is less than -18dB in the bandwidth range of 24 to 30GHz, and has good impedance matching characteristics;

[0052] Figure 6 The utility model is a frequency reconfigurable liquid crystal phase shift antenna unit suitable for phased array system, the insertion loss curve of the phase shifter is Figure 6 It can be seen that when the dielectric constant of the first liquid crystal layer is adjusted from 2.7 to 3.9, the insertion loss of the phase shifter is less than 4 dB in the bandwidth range of 24 to 30 GHz;

[0053] Figure 7 The utility model is a frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system, and the phase change curve of the phase shifter is Figure 7 It can be seen that when the dielectric constant of the liquid crystal changes, the phase of the phase shifter gradually decreases, thereby generating a differential phase shift. When the dielectric constant of the liquid crystal is adjusted to 3.9, the differential phase shift reaches 410 degrees, so the quality factor of the phase shifter can be obtained to be 105° / dB;

[0054] Figure 8 The utility model is a frequency reconfigurable liquid crystal phase shift antenna unit suitable for phased array system, the frequency reconfigurable antenna two-dimensional directional pattern, from Figure 8 It can be seen that the antenna unit has good directional radiation characteristics and is suitable for phased array systems.

[0055] Fig. 9 The utility model is a frequency reconfigurable liquid crystal phase shift antenna unit suitable for phased array system. The return loss and dielectric constant curve are obtained from Fig. 9 It can be seen that when the dielectric constant of the second liquid crystal layer changes from 2.7 to 3.9, the resonant frequency of the antenna moves from 28.8 GHz to 26.4 GHz, and the bandwidth of the antenna less than -10 dB moves between 25.27 and 30 GHz, indicating that the antenna can operate in the frequency band of 25.27 to 30 GHz.

[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system, comprising a first dielectric substrate (1), a first ground electrode layer (2), a first liquid crystal layer (3), a stripline phase shifter (4), a second dielectric substrate (5), a second ground electrode layer (6), a second liquid crystal layer (7), a radiation patch (8) and a third dielectric substrate (9), characterized in that: The first dielectric substrate (1) is located at the bottom layer, the second dielectric substrate (5) is placed relatively parallel to the first dielectric substrate (1) in a vertical direction, the third dielectric substrate (9) is placed relatively parallel to the second dielectric substrate (5) in a vertical direction, the first grounding electrode layer (2) is printed on the side of the upper surface of the first dielectric substrate (1) facing the first liquid crystal layer (3), the stripline phase shifter (4) is printed on the side of the lower surface of the second dielectric substrate (5) facing the first liquid crystal layer (3), the first liquid crystal layer (3) is filled between the first dielectric substrate (1) and the second dielectric substrate (5), the second grounding electrode layer (6) is printed on the side of the upper surface of the second dielectric substrate (5) facing the second liquid crystal layer (7), the radiation patch (8) is printed on the side of the lower surface of the third dielectric substrate (9) facing the second liquid crystal layer (7), and the second liquid crystal layer (7) is filled between the second dielectric substrate (5) and the third dielectric substrate (9).

2. The frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system according to claim 1, characterized in that: The stripline phase shifter (4) is provided with a stripline delay line, and the first grounding electrode layer (2) and the second grounding electrode layer (6) structure are composed of three parts: a main transmission line (41), a plurality of open-circuit branches (42) and a coupling feed line (43).

3. The frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system according to claim 1, characterized in that: A plurality of periodic rectangular slits (21) are dug out from the first grounding electrode layer (2) to form a defective ground structure, and the plurality of periodic rectangular slits (21) are arranged in a planar spiral structure.

4. The frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system according to claim 2, characterized in that: The stripline phase shifter (4) is implemented by a planar spiral structure, wherein a plurality of open-circuit branches (42) are vertically intersected and connected to the main transmission line (41), and their projections are staggered with a plurality of periodic rectangular gaps (21) on the first ground electrode layer (2).

5. The frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system according to claim 1, characterized in that: A plurality of first support columns (31) are placed on both sides of the first liquid crystal layer (3), and the plurality of first support columns (31) are vertically placed between the first dielectric substrate (1) and the second dielectric substrate (5).

6. The frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system according to claim 1, characterized in that: A rectangular gap (61) is dug out at the projection of the middle of the second grounding electrode layer (6) corresponding to the radiation patch (8) directly below.

7. The frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system according to claim 1, characterized in that: A plurality of second support columns (71) are placed on both sides of the second liquid crystal layer (7), and the plurality of second support columns (71) are vertically placed between the second dielectric substrate (5) and the third dielectric substrate (9).

8. The frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system according to claim 1, characterized in that: The materials used for the first dielectric substrate (1), the second dielectric substrate (5) and the third dielectric substrate (9) are glass or PCB printed boards.

9. The frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system according to claim 1, characterized in that: The materials used for the first ground electrode layer (2), the stripline phase shifter (4), the second ground electrode layer (6) and the radiation patch (8) are all copper foils with a thickness of 18 um.

10. The frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system according to claim 1, characterized in that: The material used for the first liquid crystal layer (3) and the second liquid crystal layer (7) is a stable wide-temperature liquid crystal with a thickness of 50 um.

Images