Strip line broadband phase shifter

Abstract

The utility model aims to provide a strip line broadband phase shifter. The strip line broadband phase shifter comprises a substrate I, a substrate II and a substrate III, the top surface of the substrate I is integrally covered with a metal layer I, and the bottom surface of the substrate III is integrally covered with a metal layer II; a main line I, a main line II and a Port2 port are respectively arranged on the bottom surface of the substrate I and the top surface of the substrate II; and a main line III, a main line IV, a reference line, a Port 1 port, a Port 3 port and a Port 4 port are respectively arranged on the bottom surface of the substrate II and the top surface of the substrate III. The antenna is small in electromagnetic radiation, is low in radiation loss, is high in anti-interference capability, and can be suitable for occasions where a phased array radar is high in anti-interference capability.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave radio frequency filters, in particular to a stripline broadband phase shifter. Background Art

[0002] Phase shifters are control elements that control signal phase changes and are widely used in radar systems, microwave communication systems, and measurement systems, especially in phased array radars. Driven by practical application requirements, phased array radars continue to develop towards higher beam scanning speeds, scanning accuracy, detection range, and anti-interference capabilities to achieve high-speed data transmission, low latency, and high spectral efficiency. As a core component of phased array radars, phase shifters can effectively control the direction of the radar beam by adjusting the phase of the electromagnetic waves emitted by the array elements, thereby achieving functions such as scanning, detection, and tracking of targets. As a core component of phased arrays, phase shifters vary in array size from a dozen to tens of thousands of elements. Their operating bandwidth, phase shift accuracy, and anti-interference capabilities directly affect the performance of the entire phased array system.

[0003] With advances in integrated circuit technology and the reduction in the cost and size of electronic equipment, phase shifters have truly become widely used, thanks to the rapid development of phased arrays. Phased array systems are no longer limited to the military and are gradually expanding into civilian applications. Civilian phased array radars are widely used in weather forecasting systems. Their fast scanning speed and strong anti-interference capabilities significantly reduce the impact of severe weather (such as thunderstorms and hail) on forecasts. They ensure that radars can effectively distinguish meteorological signals from background noise, improving forecast accuracy and providing early warning of extreme weather events. Furthermore, phased array technology is being used in efficient air traffic control systems, enabling faster, more flexible, and higher-resolution aircraft surveillance. Phased array technology can also be used to track airborne chemical and biological substances to diagnose potential air quality issues.

[0004] Research on broadband phase shifters was first proposed by B.M. Schiffman. The classic Schiffman phase shifter consists of a uniform transmission line as the reference line and a folded edge-coupled transmission line as the main path. Its simple structure made it widely used, but its design was limited by coupling strength, and the problem of too small a coupling gap was difficult to handle during manufacturing. Subsequently, many researchers, including SY Eom, employed stubs to increase the operating bandwidth. However, the complex structure and the addition of multiple stubs not only increased the physical size of the circuit but also further increased insertion loss. In 2005, Professor Zhu Lei first proposed the design of an ultra-wideband filter based on a multimode resonator. This design uniformly distributes the first three resonant modes of a stepped impedance multimode resonator within the ultra-wideband passband and achieves ultra-wideband passband characteristics through appropriate strong port coupling. However, the multimode resonant modes are still susceptible to coupling strength limitations, often preventing wide bandwidth. To overcome the achievable coupling strength limitations of narrow-edge-coupled phase shifters and achieve even wider bandwidth, AM Abbosh first proposed a phase shifter using a three-layer wide-edge coupler structure in 2007. The coupler structure consists of upper and lower elliptical microstrip patches. By etching an elliptical hole in the ground between them, the wide sides of the upper and lower patches are tightly coupled. This design effectively solves the problem of achieving wide bandwidth due to limited coupling strength. Since then, many researchers have improved the design, but all existing studies have used microstrip line structures. Microstrip conductors are exposed to air, and some electromagnetic fields will radiate into the air. In addition, the relative dielectric constant is unstable, requiring a shielding cover to reduce interference, which increases the volume, complexity, and cost of the system. At the same time, as the bandwidth increases, the small coupling gap will lead to processing errors that significantly affect the phase shift effect. Moreover, when the phased array radar has high anti-interference requirements, the advantages of microstrip lines are relatively small. Summary of the Invention

[0005] The utility model aims to provide a stripline broadband phase shifter with small electromagnetic radiation, low radiation loss and strong anti-interference ability. It not only has the advantage of simple structure, but also overcomes the problem of limited parallel coupling gap of traditional phase shifters. It can be used in occasions with high anti-interference requirements, such as phased array radar.

[0006] The stripline broadband phase shifter comprises substrate I, substrate II, and substrate III;

[0007] The top surface of the substrate I is entirely covered with metal layer I, and the bottom surface of the substrate III is entirely covered with metal layer II; the bottom surface of the substrate I and the top surface of the substrate II have the same structure, and the same top surface structures are stacked tightly together; the bottom surface of the substrate II and the top surface of the substrate III have the same layout structure, and the same top surface structures are stacked tightly together;

[0008] The main line I, main line II, and Port 2 are respectively provided on the bottom surface of the substrate I and the top surface of the substrate II. One end of the main line I is connected to the Port 2, and the other end is connected to one end of the main line II. A metal hole is provided on the substrate II at the other end of the main line II, and the main line II is connected to the metal hole.

[0009] The main line III, main line IV, reference line, Port 1, Port 3 and Port 4 are respectively arranged on the bottom surface of the substrate II and the top surface of the substrate III;

[0010] The metal hole passes through substrate II and is connected to one end of main line III. The other end of main line III is connected to one end of main line IV, and the other end of main line IV is connected to Port 1. The two ends of the reference line are connected to Port 3 and Port 4 respectively.

[0011] The Port 2 is located on the left side of the front side of the bottom surface of the substrate I and the top surface of the substrate II. The main line I is arranged in the left-right direction, the main line II is arranged in the front-back direction, and the metal hole is located in the middle of the rear side of the substrate II.

[0012] The Port 1 is located on the bottom surface of the substrate II and the right side of the front side of the top surface of the substrate III. The main line III is arranged along the left-right direction, and the main line IV is arranged along the front-back direction.

[0013] The reference lines include metal wire I, metal wire II, metal wire III, metal wire IV, and metal wire V; the Port3 port and the Port4 port are respectively arranged on the left and right sides of the bottom surface of substrate II and the middle of the top surface of substrate III, one end of metal wire I is connected to the Port4 port, the other end of metal wire I is connected to one end of metal wire II, the other end of metal wire II is connected to one end of metal wire III, the other end of metal wire III is connected to one end of metal wire IV, the other end of metal wire IV is connected to one end of metal wire V, and the other end of metal wire V is connected to the Port3 port;

[0014] The metal wires I, III and V are arranged along the left-right direction, and the metal wires II and IV are arranged along the front-back direction; the metal wires II and IV are located on the left and right sides of the main wire III, and the metal wire III is located in front of the front end of the main wire III.

[0015] The bottom surface of the substrate I, the top surface and bottom surface of the substrate II, and the top surface of the substrate III are also provided with metal strips I, II, and III with the same layout. The metal strips I, II, and III on each board surface are electrically connected to the metal layer I and the metal layer II through the metallized aperture I.

[0016] The metal band I is arranged on the left side edge of the plate surface in the front-rear direction, the metal band III is arranged on the right side edge of the plate surface in the front-rear direction, and the metal band II is arranged on the front side edge of the plate surface in the left-right direction, and the two ends of the metal band II are connected with the front ends of the metal band I and the metal band III respectively; the metal band I, the metal band II and the metal band III are not in contact with the main line I, the main line II, the main line III, the main line IV and the reference line.

[0017] The bottom surface of the substrate I, the top surface and the bottom surface of the substrate II and the top surface of the substrate III are further provided with metal bands IV and V with the same layout; the metal bands IV and V on each plate surface are in conduction with the metal layer I and the metal layer II through the metallized small holes II;

[0018] The metal bands IV and V on the bottom surface of the substrate II and the top surface of the substrate III are located on the left and right sides of the plate surface and are located behind the Port4 port and the Port3 port respectively; the metal bands IV and V are not in contact with the main line I, the main line II, the main line III, the main line IV and the reference line.

[0019] The bottom surface of the substrate I, the top surface and the bottom surface of the substrate II and the top surface of the substrate III are further provided with a metal band VI with the same layout; the metal band VI on each plate surface is in conduction with the metal layer I and the metal layer II through the metallized small holes III;

[0020] The metal band VI is arranged on the rear side edge of the plate surface in the left-right direction; the metal band VI is not in contact with the main line I, the main line II, the main line III, the main line IV and the reference line.

[0021] The metal line I, the metal line II, the metal line III, the metal line IV and the metal line V have equal widths of 0.9-1.1mm;

[0022] The metal line I and the metal line V have equal lengths of 5-6mm;

[0023] The metal line II and the metal line IV have equal lengths of 70-85mm;

[0024] The metal line III has a length of 60-72mm.

[0025] The main line II and the main line III are respectively provided with metal sheets at the contact positions with the metal holes and are in conduction with the metal holes through the metal sheets.

[0026] The main line I and the main line IV have the same length and width, the length is 95-105mm and the width is 0.6-0.8mm;

[0027] The main line II and the main line III have equal length and width, the length is 35-42mm and the width is 0.9-1.1mm.

[0028] The main line I, main line II, main line III, main line IV, reference line, metal layer I, and metal layer II are all made of copper; the thickness of each main line and reference line provided on the bottom surface of substrate I, the top surface and bottom surface of substrate II, and the top surface of substrate III is consistent with the thickness of metal layer I and metal layer II, which is 0.035 mm;

[0029] The Port1, Port2, Port3, Port4 and reference line are all made of copper, and the characteristic impedance is 50Ω.

[0030] Substrates I, II, and III are assembled into one piece through the screw holes and screws on them. At this time, the main line I, main line II, Port 2, metal strips I, II, III, IV, and V on the bottom surface of substrate I and the top surface of substrate II are stacked and tightly attached together to form an upper and lower coupling structure.

[0031] The main line III, main line IV, reference line, Port 1, Port 3, Port 4, metal strip I, metal strip II, metal strip III, metal strip IV, and metal strip V on the bottom surface of substrate II and the top surface of substrate III are stacked tightly together to form an upper and lower coupling structure.

[0032] The working principle of the utility model is: the phase difference between the inserted phase shift of the main line I and the main line II on the bottom surface of substrate I and the top surface of substrate II and the main line III and the main line IV on the bottom surface of substrate II and the top surface of substrate III and the inserted phase shift of the reference line set on the bottom surface of substrate II and the top surface of substrate III remains unchanged within a certain bandwidth to achieve a constant phase shift.

[0033] The beneficial effects of the utility model are as follows:

[0034] This new design utilizes a three-layer substrate with metal layers I and II. Striplines and other structures are placed on both sides of the central substrate, creating a closed structure that is less susceptible to external electromagnetic interference and offers enhanced anti-interference capabilities, making it suitable for applications requiring high levels of interference resistance, such as phased arrays. Furthermore, the design employs a top-bottom wideband coupling structure, resolving the manufacturing difficulties associated with the narrow parallel coupling gap at high bandwidths found in conventional phase shifters, significantly increasing the operating bandwidth.

[0035] The phase shifter of the utility model adopts upper and lower coupling and does not rely on a very small coupling gap, thereby reducing the requirements for processing accuracy and reducing the risk of accidental errors in the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 4 is a side view of the stripline broadband phase shifter of Example 1;

[0037] Figure 2Schematic diagram of the structure of the bottom surface of substrate I and the top surface of substrate II in Example 1;

[0038] Figure 3 Schematic diagram of the structure of the bottom surface of substrate II and the top surface of substrate III in Example 1;

[0039] Figure 4 is an amplitude response diagram of the simulated stripline phase shifter of Example 2;

[0040] Figure 5 is a phase shift response diagram of the simulated stripline phase shifter of Example 2;

[0041] The serial numbers and names in the figure are as follows:

[0042] 1-substrate I, 2-substrate II, 3-substrate III, 4-metal layer I, 5-metal layer II, 6-main line I, 7-main line II, 8-metal hole, 9-main line III, 10-main line IV, 11-reference line, 12-metal wire I, 13-metal wire II, 14-metal wire III, 15-metal wire IV, 16-metal wire V, 17-metal strip I, 18-metal strip II, 19-metal strip III, 20-metallized small hole I, 21-metal strip IV, 22-metal strip V, 23-metal strip VI, 24-metal sheet, 25-metallized small hole II, 26-metallized small hole III. DETAILED DESCRIPTION

[0043] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0044] like Figures 1-3 As shown, the stripline broadband phase shifter includes substrate I1, substrate II2, and substrate III3;

[0045] The top surface of the substrate I1 is entirely covered with a metal layer I4, and the bottom surface of the substrate III3 is entirely covered with a metal layer II5; the bottom surface of the substrate I1 and the top surface of the substrate II2 have the same structure, and these same top surface structures are stacked tightly together; the bottom surface of the substrate II2 and the top surface of the substrate III3 have the same layout structure, and these same top surface structures are stacked tightly together;

[0046] A main line I6, a main line II7, and a Port2 are respectively provided on the bottom surface of the substrate I1 and the top surface of the substrate II2. One end of the main line I6 is connected to the Port2, and the other end is connected to one end of the main line II7. A metal hole 8 is provided on the substrate II2 at the other end of the main line II7, and the main line II7 is conductively connected to the metal hole 8.

[0047] The bottom surface of the substrate II2 and the top surface of the substrate III3 are respectively provided with a main line III9, a main line IV10, a reference line 11, a Port1 port, a Port3 port and a Port4 port;

[0048] The metal hole 8 penetrates the substrate 2 and the main line 9, one end of the main line 9 is connected with one end of the main line 10, the other end of the main line 10 is connected with the Port1 port; two ends of the reference line 11 are connected with the Port3 port and the Port4 port respectively.

[0049] The Port2 port is arranged on the left side of the front side of the bottom surface of the substrate 1 and the top surface of the substrate 2, the main line 6 is arranged along the left-right direction, the main line 7 is arranged along the front-rear direction, and the metal hole 8 is located in the middle of the rear side of the substrate 2;

[0050] The Port1 port is arranged on the right side of the front side of the bottom surface of the substrate 2 and the top surface of the substrate 3, the main line 9 is arranged along the left-right direction, and the main line 10 is arranged along the front-rear direction.

[0051] The reference line 11 includes the metal line 1 12, the metal line 2 13, the metal line 3 14, the metal line 4 15, and the metal line 5 16; the Port3 port and the Port4 port are arranged on the left and right sides of the middle of the bottom surface of the substrate 2 and the top surface of the substrate 3, one end of the metal line 1 12 is connected with the Port4 port, the other end of the metal line 1 12 is connected with one end of the metal line 2 13, the other end of the metal line 2 13 is connected with one end of the metal line 3 14, the other end of the metal line 3 14 is connected with one end of the metal line 4 15, the other end of the metal line 4 15 is connected with one end of the metal line 5 16, and the other end of the metal line 5 16 is connected with the Port3 port;

[0052] The metal line 1 12, the metal line 3 14, and the metal line 5 16 are arranged along the left-right direction, the metal line 2 13 and the metal line 4 15 are arranged along the front-rear direction; the metal line 2 13 and the metal line 4 15 are located on the left and right sides of the main line 9, and the metal line 3 14 is located in front of the front end of the main line 9.

[0053] The bottom surface of the substrate 1, the top surface and the bottom surface of the substrate 2, and the top surface of the substrate 3 are further provided with metal strips 1 17, metal strips 2 18, and metal strips 3 19 with the same layout, and the metal strips 1 17, the metal strips 2 18, and the metal strips 3 19 on each surface are connected with the metal layer 1 4 and the metal layer 2 5 through the metallized small holes 1 20;

[0054] The metal belt I17 is arranged on the left edge of these plate surfaces along the front-to-back direction, the metal belt III19 is arranged on the right edge of these plate surfaces along the front-to-back direction, and the metal belt II18 is arranged on the front edge of these plate surfaces along the left-right direction. The two ends of the metal belt II18 are respectively connected to the front ends of the metal belt I17 and the metal belt III19; the metal belt I17, metal belt II18, and metal belt III19 do not contact the main line I6, main line II7, main line III9, main line IV10, and reference line 11.

[0055] The bottom surface of the substrate I1, the top and bottom surfaces of the substrate II2, and the top surface of the substrate III3 are also provided with metal strips IV21 and V22 with the same layout; the metal strips IV21 and V22 on each board surface are electrically connected to the metal layer I4 and the metal layer II5 through the metallized holes II25;

[0056] The metal strips IV21 and V22 on the bottom surface of substrate II2 and the top surface of substrate III3 are located on the left and right sides of the board surface, behind Port 4 and Port 3 respectively; the metal strips IV21 and V22 do not contact the main line I6, main line II7, main line III9, main line IV10, and reference line 11.

[0057] The bottom surface of the substrate I1, the top and bottom surfaces of the substrate II2, and the top surface of the substrate III3 are also provided with metal strips VI23 of the same layout; the metal strips VI23 on each board surface are electrically connected to the metal layer I4 and the metal layer II5 through the metallized holes III26;

[0058] The metal belt VI 23 is arranged at the rear side edge of these panels along the left-right direction; the metal belt VI 23 does not contact the main line I, the main line II 7 , the main line III 9 , the main line IV 10 , and the reference line 11 .

[0059] The metal wire I12, metal wire II13, metal wire III14, metal wire IV15, and metal wire V16 have the same width of 1 mm;

[0060] The metal wire I 12 and the metal wire V 16 are of equal length, 5.5 mm.

[0061] The lengths of the metal wire II 13 and the metal wire IV 15 are equal, and are 80 mm;

[0062] The length of the metal wire III 14 is 67 mm.

[0063] Metal sheets 24 are respectively provided at the contact points between the main line II7 and the main line III9 and the metal hole 8 , and the main line II7 and the main line III9 are electrically connected to the metal hole 8 through the metal sheets 24 .

[0064] The main line I6 and the main line IV10 have the same length and width, with a length of 100 mm and a width of 0.7 mm;

[0065] The length and width of the main line II 7 and the main line III 9 are equal, the length is 38 mm, and the width is 1 mm.

[0066] The main line I 6, the main line II 7, the main line III 9, the main line IV 10, the reference line 11, the metal layer I 4 and the metal layer II 5 are all made of copper; the thicknesses of the bottom surface of the substrate I 1, the top surface and the bottom surface of the substrate II 2, each main line provided on the top surface of the substrate III 3 and the reference line 11 are consistent with the thicknesses of the metal layer I 4 and the metal layer II 5, and all are 0.035 mm;

[0067] The Port1 port, the Port2 port, the Port3 port, the Port4 port and the reference line 11 are all made of copper, and the characteristic impedances are all 50 Ω. Embodiment 2

[0068] Simulation experiment is conducted on the stripline wideband phase shifter of embodiment 1

[0069] A phase shifter with a center frequency f0= 1GHz, a relative bandwidth FBW of 66%, a return loss RL less than -15.2dB, an insertion loss IL greater than -0.35dB and a phase shift of 90±5° in a frequency band of 0.67Ghz-1.34Ghz is designed. Then, a Rogers 5880 substrate is selected in HFSS 2022R1 for modeling and simulation, the physical size is calculated by ADS LINECAL tool, and finally the geometry size of the stripline width and the coupling line is optimized by using the HFSS software, so that the phase shift of 90° is realized. Figure 4 and Figure 5 The amplitude response and the phase response of the proposed phase shifter are shown in the figures.

[0070] It can be seen from Figure 4 that the stripline phase shifter designed in the application realizes the return loss RL less than -15.2dB and the insertion loss IL greater than -0.35dB.

[0071] It can be seen from Figure 5 that the phase shift of 90±5° is realized in the frequency band of 0.67Ghz-1.34Ghz, and the relative bandwidth is 66%.

Claims

1. A stripline broadband phase shifter, comprising a substrate I (1), a substrate II (2), and a substrate III (3); characterized in that: The top surface of the substrate I (1) is entirely covered with a metal layer I (4), and the bottom surface of the substrate III (3) is entirely covered with a metal layer II (5); the bottom surface of the substrate I (1) and the top surface of the substrate II (2) have the same structure, and the same top surface structures are stacked and closely attached together; the bottom surface of the substrate II (2) and the top surface of the substrate III (3) have the same layout structure, and the same top surface structures are stacked and closely attached together; A main line I (6), a main line II (7), and a Port 2 are respectively provided on the bottom surface of the substrate I (1) and the top surface of the substrate II (2). One end of the main line I (6) is connected to the Port 2, and the other end is connected to one end of the main line II (7). A metal hole (8) is provided on the substrate II (2) at the other end of the main line II (7), and the main line II (7) is connected to the metal hole (8). The bottom surface of the substrate II (2) and the top surface of the substrate III (3) are respectively provided with a main line III (9), a main line IV (10), a reference line (11), a Port 1 port, a Port 3 port and a Port 4 port; The metal hole (8) passes through the substrate II (2) and is connected to one end of the main line III (9). The other end of the main line III (9) is connected to one end of the main line IV (10). The other end of the main line IV (10) is connected to the Port 1 port. The two ends of the reference line (11) are respectively connected to the Port 3 port and the Port 4 port.

2. The stripline broadband phase shifter according to claim 1, wherein: The Port 2 is located on the left side of the front side of the bottom surface of the substrate I (1) and the top surface of the substrate II (2), the main line I (6) is arranged in the left-right direction, the main line II (7) is arranged in the front-back direction, and the metal hole (8) is located in the middle of the rear side of the substrate II (2); The Port 1 is located on the right side of the front side of the bottom surface of the substrate II (2) and the top surface of the substrate III (3), the main line III (9) is arranged along the left-right direction, and the main line IV (10) is arranged along the front-back direction.

3. The stripline broadband phase shifter according to claim 2, wherein: The reference line (11) includes a metal line I (12), a metal line II (13), a metal line III (14), a metal line IV (15), and a metal line V (16); the Port3 port and the Port4 port are respectively arranged on the left and right sides of the bottom surface of the substrate II (2) and the middle of the top surface of the substrate III (3); one end of the metal line I (12) is connected to the Port4 port, the other end of the metal line I (12) is connected to one end of the metal line II (13), the other end of the metal line II (13) is connected to one end of the metal line III (14), the other end of the metal line III (14) is connected to one end of the metal line IV (15), the other end of the metal line IV (15) is connected to one end of the metal line V (16), and the other end of the metal line V (16) is connected to the Port3 port; The metal wires I (12), III (14), and V (16) are arranged in the left-right direction, and the metal wires II (13) and IV (15) are arranged in the front-back direction; the metal wires II (13) and IV (15) are located on the left and right sides of the main wire III (9), and the metal wire III (14) is located in front of the front end of the main wire III (9).

4. The stripline broadband phase shifter according to claim 3, wherein: The bottom surface of the substrate I (1), the top surface and bottom surface of the substrate II (2), and the top surface of the substrate III (3) are also provided with metal strips I (17), metal strips II (18), and metal strips III (19) of the same layout. The metal strips I (17), metal strips II (18), and metal strips III (19) on each plate surface are electrically connected to the metal layer I (4) and the metal layer II (5) through the metallized small holes I (20); The metal strip I (17) is arranged on the left edge of these plate surfaces along the front-back direction, the metal strip III (19) is arranged on the right edge of these plate surfaces along the front-back direction, and the metal strip II (18) is arranged on the front edge of these plate surfaces along the left-right direction. The two ends of the metal strip II (18) are respectively connected to the front ends of the metal strip I (17) and the metal strip III (19); the metal strip I (17), the metal strip II (18), and the metal strip III (19) do not contact the main line I (6), the main line II (7), the main line III (9), the main line IV (10), and the reference line (11).

5. The stripline broadband phase shifter according to claim 3, wherein: The bottom surface of the substrate I (1), the top surface and bottom surface of the substrate II (2), and the top surface of the substrate III (3) are also provided with metal strips IV (21) and metal strips V (22) of the same layout; the metal strips IV (21) and metal strips V (22) on each plate surface are electrically connected to the metal layer I (4) and the metal layer II (5) through the metallized small holes II (25); The metal strips IV (21) and V (22) on the bottom surface of substrate II (2) and the top surface of substrate III (3) are located on the left and right sides of the board surface, respectively, behind Port 4 and Port 3; the metal strips IV (21) and V (22) do not contact the main line I (6), main line II (7), main line III (9), main line IV (10), and reference line (11).

6. The stripline broadband phase shifter according to claim 3, wherein: The bottom surface of the substrate I (1), the top surface and bottom surface of the substrate II (2), and the top surface of the substrate III (3) are also provided with metal strips VI (23) of the same layout; the metal strips VI (23) on each plate surface are connected to the metal layer I (4) and the metal layer II (5) through the metalized small holes III (26); The metal strip VI (23) is arranged on the rear side edges of these plate surfaces along the left-right direction; the metal strip VI (23) does not contact the main line I (), the main line II (7), the main line III (9), the main line IV (10), and the reference line (11).

7. The stripline broadband phase shifter according to claim 3, wherein: The metal wire I (12), metal wire II (13), metal wire III (14), metal wire IV (15), and metal wire V (16) have the same width of 0.9-1.1 mm; The metal wire I (12) and the metal wire V (16) are of equal length, and their length is 5-6 mm; The metal wire II (13) and the metal wire IV (15) are of equal length, and their length is 70-85 mm; The length of the metal wire III (14) is 60-72 mm.

8. The stripline broadband phase shifter according to claim 1, wherein: Metal sheets (24) are respectively provided at the contact points between the main line II (7) and the main line III (9) and the metal hole (8), and are electrically connected to the metal hole (8) through the metal sheets (24).

9. The stripline broadband phase shifter according to claim 1, wherein: The main line I (6) and the main line IV (10) have the same length and width, with a length of 95-105 mm and a width of 0.6-0.8 mm; The length and width of the main line II (7) and the main line III (9) are equal, with a length of 35-42 mm and a width of 0.9-1.1 mm.

10. The stripline broadband phase shifter according to claim 1, wherein: The main line I (6), main line II (7), main line III (9), main line IV (10), reference line (11), metal layer I (4), and metal layer II (5) are all made of copper; the thickness of each main line and reference line (11) provided on the bottom surface of substrate I (1), the top surface and bottom surface of substrate II (2), and the top surface of substrate III (3) is consistent with the thickness of metal layer I (4) and metal layer II (5), which is 0.035 mm; The Port 1 port, the Port 2 port, the Port 3 port, the Port 4 port, and the reference line (11) are all made of copper, and the characteristic impedance is 50Ω.

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