Plane broadband reflection type phase shifter with phase range covering all 360 degrees

Abstract

The invention discloses a planar broadband reflective phase shifter with a phase range covering all 360 degrees. According to the specific scheme, the planar broadband reflective phase shifter comprises a first part of circuit, a second part of circuit and two 50-ohm port connecting lines, wherein the first part of circuit is formed by element loading parallel double lines; the second part of circuit is formed by a large phase shift reflective load; 360-degree phase shift is achieved by achieving two-time parallel resonance, the bandwidth is widened by loading the element with the parallel double-line coupler, and the tuning ratio of the diode is increased through the structure that the diode is connected with the inductor in series; the device can realize all 360-degree phase shift, and has the advantages of wide frequency band, small size and lower insertion loss. In addition, the phase shifter is low in cost, simple in structure, easy to process and suitable for wide popularization.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency circuits and microwave communication technology, and in particular to a planar broadband reflective phase shifter with a phase range covering a full 360°. Background Art

[0002] With the development of radio technology and radio frequency integrated circuits, phased array technology has been widely used in many fields such as communication systems and radar detection. It is mainly used for beamforming and spatial filtering, thereby improving the equivalent isotropic radiated power of the transmitter, enhancing the signal-to-noise ratio of the receiver and reducing interference. In a phased array system, each array element needs to adjust its signal phase to form a beam, which requires a phase shifter. The phase shifter can adjust the signal phase of each array element to achieve beam forming and scanning. Specifically, it adjusts the radiation direction and beam shape of the entire array by controlling the phase difference of each array element. In this way, the system can dynamically change the direction of the beam without physically moving the antenna, achieving effective spatial filtering and interference suppression. Therefore, in a phased array system, the phase shifter plays a vital role. High-performance phase shifters should have the characteristics of broadband, wide phase adjustment range, low insertion loss, dense phase shift angles and small size.

[0003] Phase shifters can be divided into active phase shifters and passive phase shifters according to their structural form. Compared with passive phase shifters, active phase shifters can provide a larger phase adjustment range and lower insertion loss, but require an external power supply to drive. Passive phase shifters are divided into reflective phase shifters and switching phase shifters according to their implementation methods. Switching phase shifters change the phase by controlling the switching states of multiple phase shifting units. The phase adjustment of this type of phase shifter is usually discrete, and as the number of phase states increases, more switching states are required. The phase shifter will become bulky and affect the beamforming effect. Reflective phase shifters are analog phase shifters. Their structure is usually simpler and they can continuously and finely adjust the phase. They are usually small in size and have low insertion loss.

[0004] However, the operating bandwidth of traditional reflective phase shifters is usually narrow, and because they rely on the reflection characteristics of the reflective load, as the frequency changes, the reflection coefficient and phase change may no longer be linear, resulting in the performance of the phase shifter being unstable over a wider frequency band. In addition, existing reflective load technologies mainly include varactor diode loads and resonant loads. The phase adjustment range of a single varactor diode is small, and multiple varactor diodes are often required to be connected in parallel to expand the phase shift range. Resonant loads, such as CL-type and Π-type resonant loads, are difficult to achieve a complete 360° phase adjustment. To achieve this goal, three or even more resonances are required. In order to solve the above problems, a planar broadband reflective phase shifter with a full 360° phase range is proposed, and a large phase shift reflective load is used to achieve a wider phase adjustment range. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention discloses a planar broadband reflective phase shifter with a phase range covering a full 360°. By adjusting the structure of the coupler and the structure of the reflective load, the phase shift range and bandwidth range of the reflective phase shifter are improved, the insertion loss is reduced to a certain extent, the size is reduced, and the various indicators of the phase shifter are brought into a balanced state. The specific scheme is: the component is loaded with parallel double lines, a large phase shift reflective load and a port connection line;

[0006] The component-loaded parallel double wires include a first section of capacitor-loaded parallel double wires, a capacitor-loaded jumper inductor, a second section of capacitor-loaded parallel double wires, a first parallel capacitor, a second parallel capacitor, a third parallel capacitor, a fourth parallel capacitor, a fifth parallel capacitor, a sixth parallel capacitor, a jumper inductor, a first section of parallel double wires, and a second section of parallel double wires; the first section of capacitor-loaded parallel double wires, the capacitor-loaded jumper inductor, and the second section of capacitor-loaded parallel double wires are connected in sequence from left to right; one end of the first parallel capacitor is connected to the upper left end of the first section of parallel double wires and the other end is connected to ground, one end of the second parallel capacitor is connected to the lower left end of the first parallel double line and the other end is grounded, one end of the third parallel capacitor is connected to the upper right end of the second parallel double line and the other end is grounded, one end of the fourth parallel capacitor is connected to the lower right end of the second parallel double line and the other end is grounded, the jumper inductor is connected across the connection between the first parallel double line and the second parallel double line, one end of the fifth parallel capacitor is connected to the upper end of the jumper inductor and the other end is grounded, and one end of the sixth parallel capacitor is connected to the lower end of the jumper inductor and the other end is grounded;

[0007] The large phase-shift reflective load includes a first reflective load and a second reflective load with the same structural parameters; the first reflective load is connected to the upper right end of the second capacitor-loaded parallel double line; the second reflective load is connected to the lower right end of the second capacitor-loaded parallel double line; the first reflective load includes a first series inductor, a second series inductor, a first series varactor, a second series varactor and a parallel varactor; the right end of the first series inductor is connected to the cathode of the first series varactor; the anode of the first series varactor is grounded; the right end of the second series inductor is connected to the cathode of the second series varactor; the anode of the second series varactor is grounded; the first series inductor and the second series inductor are connected in parallel and then connected to the cathode of the varactor; the anode of the parallel varactor is grounded;

[0008] The port connection line includes a first 50-ohm transmission line and a second 50-ohm transmission line; the upper end of the first 50-ohm transmission line is connected to the input port, and the lower end is connected to the upper left end of the first section of capacitor-loaded parallel double lines; the lower end of the second 50-ohm transmission line is connected to the output port, and the upper end is connected to the lower left end of the first section of capacitor-loaded parallel double lines.

[0009] Furthermore, the electrical lengths of the first parallel double wire and the second parallel double wire are equal; the capacitances of the first parallel capacitor, the second parallel capacitor, the third parallel capacitor, and the fourth parallel capacitor are the same; the capacitances of the fifth parallel capacitor and the sixth parallel capacitor are the same; the inductances of the first series inductor and the second series inductor are the same; the models and supply voltages of the first series varactor diode, the second series varactor diode and the parallel varactor diode are the same.

[0010] Furthermore, by adjusting the supply voltages of the first series varactor diode, the second series varactor diode and the parallel varactor diode, the reflection phases of the first reflection load and the second reflection load can be varied within a larger range, thereby achieving a full 360° phase variation range of the phase shifter.

[0011] Furthermore, the inductance of the jumper inductor is related to the bandwidth of the phase shifter, and the capacitances of the first parallel capacitor, the second parallel capacitor, the third parallel capacitor, the fourth parallel capacitor, the fifth parallel capacitor, and the sixth parallel capacitor and the inductances of the first series inductor and the second series inductor are related to the loss of the phase shifter.

[0012] Furthermore, a design method of a planar broadband reflective phase shifter with a phase range covering a full 360° is as follows:

[0013] For the convenience of analysis, the large phase shift reflection load and the component loading parallel double line are divided into two parts for analysis. The characteristic impedance of the input / output port and the equivalent impedance of the parallel double line loaded with the flat component are Z 0 , the large phase shift reflective load consists of three branches, the impedance of the first branch is The impedance of the second branch is The impedance of the third branch is The total impedance of the large phase-shift reflective load is Z L =Z 1 / / Z 2 / / Z 3 ;

[0014] Where ω=2πf,L 1 is the inductance value of the first series inductor (211) and the second series inductor (212), R s is the parasitic resistance of the varactor diode, C is the capacitance value of the varactor diode;

[0015] The input impedance Z of the reflective load is expressed by the following formula: L expression:

[0016]

[0017] According to the above formula, the reflection coefficient is obtained:

[0018]

[0019] in

[0020] T 1 =ω 2 R S 2 C 2 +ω 2 L 1 C-1;

[0021] T 2 =ω 3 L 1 R S C 2 -2ωR S C;

[0022] T 3 =3Z 0 ω 2 R S C 2 ;

[0023] T 4 =Z 0 (ω 3 L 1 C 2 -3ωC);

[0024] The maximum phase shift Δφ of the reflective phase shifter is |φ max -φ min |,Insertion loss|S 21 |=-20lg|Γ|;

[0025] φ max is the phase shift of the maximum capacitance, φ min is the phase shift of the minimum capacitance, according to Δφ and |S 21 |, and analyze Δφ and |S 21 | Mainly affected by the value of the varactor diode C and the inductance L 1 Influence, when the first series inductor (211) and the second series inductor (212) have different values, the maximum phase shift and the insertion loss change curve with the diode capacitance value, when the phase shift and the insertion loss reach a balance, the appropriate inductance value is selected.

[0026] Due to the adoption of the above scheme, the present invention proposes a planar broadband reflective phase shifter with a phase range covering a full 360° to meet the needs of modern communication systems for wide phase adjustment, and can achieve a full 360° phase shift; the circuit design with component loading is adopted to obtain a wider operating frequency range; by selecting appropriate values ​​of components, lower insertion loss and greater return loss can be obtained; by adjusting the circuit layout, an integrated design is completed, with the advantage of a smaller size. In addition, the structure of the present invention is simpler, easy to process, low cost, etc., and can be widely used in radar and wireless communication systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic structural diagram of a planar broadband reflective phase shifter with a phase range covering a full 360° according to the present invention;

[0029] Figure 2 is a phase shift performance curve of a planar broadband reflective phase shifter with a phase range covering a full 360° according to the present invention;

[0030] Figure 3 is a return loss curve of the planar broadband reflective phase shifter with a phase range covering the entire 360° according to the present invention;

[0031] Figure 4 is an insertion loss curve of the planar broadband reflective phase shifter with a phase range covering the entire 360° according to the present invention;

[0032] In the figure: 11, the first section of capacitor-loaded parallel double wires, 12, the second section of capacitor-loaded parallel double wires, 13, capacitor-loaded jumper inductor, 111, the first parallel capacitor, 112, the second parallel capacitor, 113, the first section of parallel double wires, 121, the third parallel capacitor, 122, the fourth parallel capacitor, 123, the second section of parallel double wires, 131, the fifth parallel capacitor, 132, the sixth parallel capacitor, 133, jumper inductor, 21, the first reflected load, 211, the first series inductor, 212, the second series inductor, 213, the first series varactor diode, 214, the second series varactor diode, 215, parallel varactor diode, 22, the second reflected load, 31, the first 50 ohm transmission line, 32, the second 50 ohm transmission line. DETAILED DESCRIPTION

[0033] To make the technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0034] Figure 1 The schematic diagram of the structure of a planar broadband reflective phase shifter with a phase range covering a full 360° in the present invention is shown. The reflective phase shifter in this example may include: parallel double lines, a large phase shift reflective load, two 50 ohm matching ports, a parallel capacitor and a jumper inductor;

[0035] Further, the first section of capacitor-loaded parallel double wires 11, the capacitor-loaded jumper inductor 13 and the second section of capacitor-loaded parallel double wires 12 are connected in sequence from left to right; one end of the first parallel capacitor 111 is connected to the upper left end of the first section of parallel double wires 113 and the other end is grounded, one end of the second parallel capacitor 112 is connected to the lower left end of the first section of parallel double wires 113 and the other end is grounded, one end of the third parallel capacitor 121 is connected to the upper right end of the second section of parallel double wires 123 and the other end is grounded, one end of the fourth parallel capacitor 122 is connected to the lower right end of the second section of parallel double wires 123 and the other end is grounded, the jumper inductor 133 is bridged at the connection between the first section of parallel double wires 113 and the second section of parallel double wires 123, one end of the fifth parallel capacitor 131 is connected to the upper end of the jumper inductor 133 and the other end is grounded, and one end of the sixth parallel capacitor 132 is connected to the lower end of the jumper inductor 133 and the other end is grounded;

[0036] Furthermore, the large phase shift reflective load includes a first reflective load 21 and a second reflective load 22 having the same structural parameters; the first reflective load 21 is connected to the upper right end of the second segment of the capacitor-loaded parallel double line 12; the second reflective load 22 is connected to the lower right end of the second segment of the capacitor-loaded parallel double line 12;

[0037] Further, the first reflective load 21 includes a first series inductor 211, a second series inductor 212, a first series varactor diode 213, a second series varactor diode 214 and a parallel varactor diode 215; the right end of the first series inductor 211 is connected to the cathode of the first series varactor diode 213; the anode of the first series varactor diode 213 is grounded; the right end of the second series inductor 212 is connected to the cathode of the second series varactor diode 214; the anode of the second series varactor diode 214 is grounded; the left end of the first series inductor 211 is connected to the left end of the second series inductor 212 and the cathode of the parallel varactor diode 215; the anode of the parallel varactor diode 215 is grounded;

[0038] Furthermore, the port connection line includes a first 50-ohm transmission line 31 and a second 50-ohm transmission line 32; the upper end of the first 50-ohm transmission line 31 is connected to the input port, and the lower end is connected to the upper left end of the first section of capacitor-loaded parallel double line 11; the lower end of the second 50-ohm transmission line 32 is connected to the output port, and the upper end is connected to the lower left end of the first section of capacitor-loaded parallel double line 11.

[0039] Furthermore, the electrical lengths of the first parallel double line 113 and the second parallel double line 123 are equal; the capacitances of the first parallel capacitor 111, the second parallel capacitor 112, the third parallel capacitor 121, and the fourth parallel capacitor 122 are the same; the capacitances of the fifth parallel capacitor 131 and the sixth parallel capacitor 132 are the same; the inductances of the first series inductor 211 and the second series inductor 212 are the same; the models and supply voltages of the first series varactor diode 213, the second series varactor diode 214, and the parallel varactor diode 215 are the same.

[0040] Furthermore, by adjusting the supply voltages of the first series varactor diode 213, the second series varactor diode 214 and the parallel varactor diode 215, the reflection phases of the first reflection load 21 and the second reflection load 22 can be varied within a larger range, thereby achieving a full 360° phase variation range of the phase shifter.

[0041] Furthermore, the inductance of the jumper inductor 133 is related to the bandwidth of the phase shifter, and the capacitance of the first parallel capacitor 111, the second parallel capacitor 112, the third parallel capacitor 121, the fourth parallel capacitor 122, the fifth parallel capacitor 131, and the sixth parallel capacitor 132 and the inductance of the first series inductor 211 and the second series inductor 212 are related to the loss of the phase shifter.

[0042] Specifically, in the present embodiment, the first series inductor 211, the second series inductor 212, the first series varactor diode 213 and the second series varactor diode 214 constitute a parallel resonant circuit, wherein the first series inductor 211 increases the tuning range of the first series varactor diode 213, and the second series inductor 212 increases the tuning range of the second series varactor diode 214, so that the partial reflective load obtains a larger phase shift within a limited tuning range; however, a parallel resonant circuit cannot achieve a full 360° phase shift, and on this basis, a parallel varactor diode 215 of the same specification is connected in parallel, and as the capacitance of the first series varactor diode 213 and the second series varactor diode 214 gradually increase, the first parallel resonant circuit is inductive as a whole, equivalent to an inductor, and constitutes a second parallel resonant circuit with the parallel varactor diode 215, and the use of the two parallel resonant circuits achieves a full 360° phase shift. In this structure, the first series inductor 211 and the second series inductor 212 have the same inductance value. By assigning different values ​​to the inductors, the changes in the maximum phase shift and insertion loss curves are observed until the two reach a balance.

[0043] Depend on Figure 1 The reflection coefficient of the entire circuit can be calculated, and the design method of the planar broadband reflection type phase shifter in the present invention is as follows:

[0044] For the convenience of analysis, the reflective load and the parallel double line are divided into two parts for analysis. The characteristic impedance of the input / output port and the equivalent impedance of the parallel double line are Z 0 , the reflective load consists of three branches, the impedance of the first branch is The impedance of the second branch is The impedance of the third branch is The total impedance of the reflected load is Z L =Z 1 / / Z 2 / / Z 3 ;

[0045] Where ω=2πf,L 1 is the inductance value of the first series inductor (211) and the second series inductor (212), R s is the parasitic resistance of the varactor diode, C is the capacitance value of the varactor diode;

[0046] The following formula gives the input impedance Z of the reflective load: L expression:

[0047]

[0048] According to the above formula, the reflection coefficient can be obtained:

[0049]

[0050]

[0051] in

[0052] T 1 =ω 2 R S 2 C 2 +ω 2 L 1 C-1;

[0053] T 2 =ω 3 L 1 R S C 2 -2ωR S C;

[0054] T 3 =3Z 0 ω 2 R S C 2 ;

[0055] T 4 =Z 0 (ω 3 L 1 C 2 -3ωC);

[0056] The maximum phase shift Δφ of the reflective phase shifter is |φ max -φ min |,Insertion loss|S 21 |=-20lg|Γ|;

[0057] φ max is the phase shift of the maximum capacitance, φ min is the phase shift of the minimum capacitance, according to Δφ and |S 21 |, we can find that Δφ and |S 21 | Mainly affected by the value of the varactor diode C and the inductance L 1 The influence of the first series inductance (211) and the second series inductance (212) is drawn, and the maximum phase shift and the insertion loss are plotted along with the change curve of the diode capacitance value when the first series inductance (211) and the second series inductance (212) take different values. When the phase shift and the insertion loss reach a balance, a suitable inductance value is selected.

[0058] In a specific embodiment of the present invention, the center frequency of the reflective phase shifter is selected to be 2.0 GHz.

[0059] Parallel double-wire part: The length of each parallel double-wire section of the component loading parallel double-wire is 9.8mm, the width is 1.6mm, the gap width is 0.2mm, and the selected jumper inductor 133 is 4.1nH; the first parallel capacitor 111, the second parallel capacitor 112, the third parallel capacitor 121 and the fourth parallel capacitor 122 are selected to be 1pF; the fifth parallel capacitor 131 and the sixth parallel capacitor 132 are selected to be 1.8pF;

[0060] Reflective load part: Based on the results of phase shift and insertion loss, the inductance of the first series inductor 211 and the second series inductor 212 is selected to be L=8.2nH, and the capacitance C of the varactor diode ranges from 0.27pF to 3.2pF. According to the selected parameters, a planar broadband reflective phase shifter with a phase range covering a full 360° is designed according to the present invention.

[0061] The technical indicators used in this embodiment are as follows:

[0062] Center frequency: 2.0GHz;

[0063] Achieved phase shift: >360°;

[0064] Bandwidth: >40%;

[0065] Return loss:>10dB.

[0066] like Figure 2 As shown, the planar broadband reflective phase shifter with a phase range covering a full 360° proposed by the present invention has a phase shift change of 406° when the capacitance of the varactor changes from 0.27pF to 3.2pF at the example center frequency of 2.0GHz, indicating that the phase shifter proposed by the present invention can achieve a full 360° phase shift. Figure 3 As shown, select the return loss |S 11 |≤-10dB is the bandwidth range, which meets the requirements in the range of 1.57GHz to 2.36GHz. The calculated relative bandwidth is 40.2%, indicating that the reflective phase shifter proposed in the present invention has a good bandwidth. Figure 4 As shown, within the operating frequency band, the insertion loss is less than 3dB.

[0067] 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 according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A planar broadband reflective phase shifter with a phase range covering the entire 360°, characterized in that include: Component loading parallel double wires, large phase shift reflective loads and port connection lines; The component-loaded parallel double wires include a first section of capacitor-loaded parallel double wires (11), a capacitor-loaded cross-inductor (13), and a second section of capacitor-loaded parallel double wires (12) arranged in sequence from left to right; the first section of capacitor-loaded parallel double wires (11) include a first parallel capacitor (111), a second parallel capacitor (112), and a first section of parallel double wires (113); the second section of capacitor-loaded parallel double wires (12) include a third parallel capacitor (121), a fourth parallel capacitor (122), and a second section of parallel double wires (123); the capacitor-loaded cross-inductor (13) includes a fifth parallel capacitor (131), a sixth parallel capacitor (132), and a cross-inductor (133); one end of the first parallel capacitor (111) is connected to the first section of parallel double wires (113); The upper left end is connected and the other end is grounded; one end of the second parallel capacitor (112) is connected to the lower left end of the first parallel double line (113) and the other end is grounded; one end of the third parallel capacitor (121) is connected to the upper right end of the second parallel double line (123) and the other end is grounded; one end of the fourth parallel capacitor (122) is connected to the lower right end of the second parallel double line (123) and the other end is grounded; the jumper inductor (133) jumps over the connection between the first parallel double line (113) and the second parallel double line (123); one end of the fifth parallel capacitor (131) is connected to the upper end of the jumper inductor (133) and the other end is grounded; one end of the sixth parallel capacitor (132) is connected to the lower end of the jumper inductor (133) and the other end is grounded; The large phase shift reflective load comprises a first reflective load (21) and a second reflective load (22) having the same structural parameters; the first reflective load (21) is connected to the upper right end of the second segment of the capacitor-loaded parallel double line (12); the second reflective load (22) is connected to the lower right end of the second segment of the capacitor-loaded parallel double line (12); the first reflective load (21) comprises a first series inductor (211), a second series inductor (212), a first series varactor diode (213), a second series varactor diode (214) and a parallel varactor diode (215). 15); the right end of the first series inductor (211) is connected to the negative electrode of the first series varactor (213); the positive electrode of the first series varactor (213) is grounded; the right end of the second series inductor (212) is connected to the negative electrode of the second series varactor (214); the positive electrode of the second series varactor (214) is grounded; the first series inductor (211) and the second series inductor (212) are connected in parallel and then connected to the negative electrode of the varactor (215); the positive electrode of the parallel varactor (215) is grounded; The port connection line comprises a first 50-ohm transmission line (31) and a second 50-ohm transmission line (32); the upper end of the first 50-ohm transmission line (31) is connected to the input port, and the lower end is connected to the upper left end of the first section of the capacitor-loaded parallel double line (11); the lower end of the second 50-ohm transmission line (32) is connected to the output port, and the upper end is connected to the lower left end of the first section of the capacitor-loaded parallel double line (11).

2. A planar broadband reflective phase shifter with a phase range covering a full 360° according to claim 1, characterized in that: The electrical lengths of the first parallel double wire (113) and the second parallel double wire (123) are equal; the capacitances of the first parallel capacitor (111), the second parallel capacitor (112), the third parallel capacitor (121), and the fourth parallel capacitor (122) are the same; the capacitances of the fifth parallel capacitor (131) and the sixth parallel capacitor (132) are the same; the inductances of the first series inductor (211) and the second series inductor (212) are the same; and the models and supply voltages of the first series varactor diode (213), the second series varactor diode (214), and the parallel varactor diode (215) are the same.

3. A planar broadband reflective phase shifter with a phase range covering the entire 360° according to claim 1, characterized in that: By adjusting the supply voltages of the first series varactor diode (213), the second series varactor diode (214) and the parallel varactor diode (215), the reflection phases of the first reflection load (21) and the second reflection load (22) are controlled to change within a set range, thereby achieving a full 360° phase change range of the phase shifter.

4. The planar broadband reflective phase shifter with a phase range covering a full 360° according to claim 1, further characterized by: The inductance of the cross-connected inductor (133) is set in association with the bandwidth of the phase shifter, and the capacitances of the first parallel capacitor (111), the second parallel capacitor (112), the third parallel capacitor (121), the fourth parallel capacitor (122), the fifth parallel capacitor (131), and the sixth parallel capacitor (132) and the inductances of the first series inductor (211) and the second series inductor (212) are set in association with the loss of the phase shifter.

5. A design method for a planar broadband reflective phase shifter with a phase range covering a full 360° as claimed in any one of claims 1 to 4, characterized in that: The steps include: The large phase shift reflection load and the component loaded parallel double line are divided into two parts for analysis. The characteristic impedance of the input / output port and the equivalent impedance of the parallel double line loaded with the flat component are Z0. The large phase shift reflection load includes three branches. The impedance of the first branch is The impedance of the second branch is The impedance of the third branch is The total impedance of the large phase-shifted reflective load is Z L = Z1 / / Z2 / / Z3; Wherein ω=2πf, L1 is the inductance value of the first series inductor (211) and the second series inductor (212), R s is the parasitic resistance of the varactor diode, C is the capacitance value of the varactor diode; The input impedance Z of the reflective load is expressed by the following formula: L expression: According to the above formula, the reflection coefficient is obtained: in T1=ω 2 R S 2 C 2 +oh 2 L1C-1; T2=ω 3 L1R S C 2 -2ωR S C; T3=3Z0ω 2 R S C 2 ; T4=Z0(ω 3 L1C 2 -3ωC); The maximum phase shift Δφ of the reflective phase shifter is |φ max -φ min |,Insertion loss|S 21 |=-20lg|Γ|; φ max is the phase shift of the maximum capacitance, φ min is the phase shift of the minimum capacitance, according to Δφ and |S 21 |, and analyze Δφ and |S 21 |Mainly affected by the varactor diode value C and the inductance L1, a curve showing the maximum phase shift and insertion loss changing with the diode capacitance value when the first series inductance (211) and the second series inductance (212) have different values ​​is prepared. When the phase shift and the insertion loss reach a balance, a suitable inductance value is selected.

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