Dielectric phase shifter

Abstract

This invention discloses a dielectric phase shifter, comprising an outer shell of a pultruded rectangular tubular profile. Two working shielding cavities and one fixing cavity are formed inside the outer shell. A functional shielding wall is provided, and its outer side is bolted to a cable welding terminal. A circuit board is clamped between two dielectric plates, which are connected by a sliding groove and pushed into the working shielding cavity. After being pushed in, the welding ports correspond one-to-one with the elongated oval through holes and extend out of the outer shell, electrically connecting to the inner core of the cable soldered to the cable welding terminal. Limiting clips are connected to the circuit board, the fixing cavity, and the outer shell respectively to fix the circuit board. This invention has advantages such as low cost, easy disassembly, easy maintenance, good electrical performance, and good PIM performance. The coaxial cable outside the cavity is arranged at an angle of 15° to 30° with the length direction of the phase shifter cavity, which significantly shortens the minimum spacing between the phase shifter ports and avoids occupying excessive wiring space.

Description

Technical Field

[0001] This invention belongs to the field of communication technology, and in particular relates to a medium phase shifter. Background Technology

[0002] A phase shifter is a core component inside an antenna that adjusts the phase of the input wave. It changes the antenna pattern and beam downtilt angle by adjusting the input phase value allocated to each radiating element in the antenna array, thereby adjusting the network coverage area.

[0003] There are two design principles for phase shifters: 1. Changing the physical length of the signal transmission line to achieve phase change, commonly seen in fan-shaped or arc-shaped sliding phase shifters and U-shaped sliding phase shifters; 2. Changing the equivalent dielectric constant of the signal transmission space to change the phase, commonly seen in dielectric sliding phase shifters. Although both types of phase shifters are still widely used in the base station antenna industry, with the continuous expansion of frequency bands and the increasing demand for new frequency bands, the advantages of dielectric phase shifters, such as short development cycle, good material versatility, and low development cost, are gradually becoming more prominent, leading the industry to gradually shift towards using dielectric phase shifters as the primary technology.

[0004] The current design features of dielectric sliding phase shifters include the following:

[0005] 1. A semi-circular, closed circular, or other irregularly shaped wiring groove is designed on one or two side walls along the length of the metal cavity. The cavity surface is electroplated with a solderable metal layer, and the outer conductor of the coaxial cable is welded to the wiring groove. The advantage of this design is that it eliminates the need for screw-fastened welding terminals, reducing the risk of intermodulation. The disadvantages are high cost, high welding temperature, and the need for specialized high-power resistance welding or induction welding equipment. In addition, long-term high-temperature welding (usually reaching above 430°C) can easily cause irreversible expansion of the dielectric plate inside the cavity or local deformation due to the release of internal stress, resulting in poor electrical performance, increased transmission torque, and other adverse consequences. Furthermore, this design also makes component maintenance difficult. When the electrical performance of a component is abnormal, it is usually replaced as a whole, resulting in low parts recycling rate.

[0006] 2. The cable core and dielectric layer at the cable end pass through the circular holes in the wiring trough and are soldered to the power divider board inside the phase shifter. The cable exposed in the wiring trough is bent at 90° and fitted into the trough, and the outer conductor of the cable is soldered into the trough. The inner angle of the 90° bend in the cable core is close to 0°, thus there is bending internal stress and potential damage, which can cause PIM (Power Injection Mitigation) problems. In addition, the rebound internal stress of the core itself will also generate continuous internal stress on the solder joint, causing abnormal electrical performance and intermodulation. The commonly used method to reduce internal stress is to use wire stripping equipment to cut open the dielectric layer, but if the cutting accuracy is not sufficient, it is easy to cut the inner conductor, introducing new intermodulation problem points.

[0007] 3. In some cases, the core wires and dielectric layers of the phase shifter's cable front end pass through round holes on the side wall of the phase shifter cavity and are welded to the power divider board inside the cavity. The cables exposed in the wiring groove are arranged perpendicular to the length of the phase shifter. The outer conductor of the cable is welded to various terminal welding structures distributed on the outside of the cavity. These terminal structures may be welded ports directly CNC machined on the cavity, or they may be welded terminals that are additionally fastened to the surface of the cavity with screws. The former has high processing costs and is inconvenient for device replacement and disassembly; the latter has low costs, but if the terminal structure design is unreasonable, it will create PIM (Potential Instant Imaging) risks. In addition, the biggest disadvantage of this design scheme is that the cable arrangement direction is perpendicular to the length of the phase shifter, requiring a larger wiring structure space and a higher risk of cable damage. Therefore, more cable fixing and protection structures are needed.

[0008] 4. Patent CN106067577 B proposes a design scheme to avoid cable bending. This scheme involves designing a closed conductive cavity outside the antenna cavity, which is connected to the main cavity. The soldering area on the PCB extends into the conductive cavity and is soldered to the core wire of the coaxial cable arranged through the conductive cavity. The welding of the outer conductor of the cable to the conductive cavity is achieved by feeding solder wire and flux into a solder inlet and outlet groove on the inner side of the conductive cavity, and then melting them under the heating of the welding equipment. However, this scheme still carries the risk of the dielectric board expanding due to the overall heating of the cavity, and its disassembly and maintenance capabilities and material recycling rate are even worse.

[0009] In conclusion, although the phase shifter of base station antennas has been fully designed, developed, and modified, continuous technological innovation is still needed to address the shortcomings of existing solutions and find the most economical, feasible, and reasonable design. Summary of the Invention

[0010] The technical objective of this invention is to provide a dielectric phase shifter to overcome the shortcomings and deficiencies of existing phase shifters.

[0011] To solve the above problems, the technical solution of the present invention is as follows:

[0012] A dielectric phase shifter includes a housing, a circuit board, a dielectric board, a limiting clip, and a cable welding terminal;

[0013] The outer shell is a pultruded rectangular tubular profile, and the outer shell is a shielding wall that is closed and connected on four sides in sequence; the inner side of the outer shell has a first rectangular cavity, a second rectangular cavity and a third rectangular cavity that pass through both ends of the outer shell from top to bottom; the first rectangular cavity and the third rectangular cavity are working shielding cavities, and the second rectangular cavity is a fixed cavity;

[0014] The shielding wall on one side of the outer shell is a functional shielding wall; the inner side of the functional shielding wall is provided with a limit notch at the connection point with the space inside the working shielding cavity, and several elongated through holes are provided on the limit notch; the outer side of the functional shielding wall is bolted to the cable welding terminal.

[0015] The circuit board has a through-slot and several soldering ports located on the same side wall;

[0016] The circuit board is clamped between two dielectric boards, which are connected by a sliding groove. After the circuit board and the dielectric boards on the upper and lower sides are fastened together, the circuit board is pushed into the working shielding cavity in accordance with the limiting notch. After being fully pushed in, several welding ports correspond one by one with several elongated oval through holes and extend out of the outer shell. Several welding ports are electrically connected to the inner core of the cable that is soldered to the cable welding terminal.

[0017] The limiting clips are connected to the circuit board, the fixing cavity, and the outer shell respectively, and are used to fix the circuit board.

[0018] Specifically, the thickness of the functional shielding wall is greater than that of the other three shielding walls, and the functional shielding wall is the sidewall of the first rectangular cavity, the second rectangular cavity, and the third rectangular cavity.

[0019] More preferably, a solid wall is also provided between the functional shielding wall and the second rectangular cavity;

[0020] The outer side of the functional shielding wall has threaded holes and positioning holes that extend to the solid wall for connecting and fixing cable welding terminals.

[0021] Specifically, the cable welding terminal includes a cable, a connector, a pair of cable welding grooves on both sides of the connector, and a limiting ring at the front end of the cable welding groove;

[0022] The dielectric layer of the cable passes through the limiting ring until the outer conductor of the cable contacts the surface of the limiting ring and is soldered to the limiting ring.

[0023] The bottom surface of the connector has an annular boss and a cylindrical pin. The annular boss has a mounting through hole in the middle. The mounting through hole is matched with the threaded hole of the functional shielding wall to assemble the cable welding terminal onto the functional shielding wall.

[0024] The plane where the cable welding groove is located is set at an angle of 15 to 30 degrees to the plane where the annular boss is located, and the plane where the cable is located is also set at an angle of 15 to 30 degrees to the plane where the annular boss is located.

[0025] More preferably, it also includes a terminal fixing seat, the terminal fixing seat includes a base plate, the base plate has a circular through hole, a cylindrical pin on one side of the base plate, a limiting hole, a semi-enclosed protective wall and a buckle on the other side of the base plate;

[0026] The mounting through holes, circular through holes and threaded holes are set accordingly. The cylindrical pins are connected to the corresponding positioning holes, and the limit holes are connected to the corresponding cylindrical pins. This is used to connect the cable welding terminals to the functional shielding wall bolts via the terminal fixing seat.

[0027] The clip is used to connect the terminal holder to the cable welding terminal clip;

[0028] A semi-enclosed sheath is used to wrap around the outside of the cable welding terminal to restrict rotation.

[0029] More preferably, a pair of connecting limiting walls are also provided on one side of the base plate;

[0030] Limiting bosses are also provided at the connection points between the outer side of the functional shielding wall and the upper and lower shielding walls;

[0031] The connecting limiting wall, in conjunction with the limiting boss, is used to pre-fix the terminal fixing seat and the functional shielding wall.

[0032] More preferably, the circuit board is provided with bosses and limiting notches at both ends;

[0033] By pushing the boss to move the circuit board, several soldering ports pass through several elongated through holes on the outer casing and extend to the outside of the working shielding cavity;

[0034] The limiting notch and the limiting clip are used to fix the circuit board.

[0035] Specifically, the upper top plate or lower bottom plate of the fixing cavity is provided with at least one limiting rib along the direction of circuit board insertion. The limiting rib cooperates with the limiting clip to fix the circuit board.

[0036] The limiting clip has a guide wall in the middle, which is pushed in along the limiting rib of the fixed cavity to connect with the fixed cavity.

[0037] The guide wall has limiting grooves on both sides, which match the limiting notches of the circuit board for connection with the circuit board;

[0038] The limiting card has limiting walls on both sides. A cylindrical pin is provided on the side of the limiting wall near the guide wall. The cylindrical pin cooperates with the positioning through holes opened on the upper and lower shielding walls to connect with the outer shell and fix the circuit board after it is pushed in.

[0039] Because the present invention adopts the above technical solution, it has the following advantages and positive effects compared with the prior art:

[0040] The phase shifter of this invention overcomes the shortcomings and deficiencies of existing phase shifters, and has the advantages of low cost, easy disassembly, easy maintenance, good electrical performance and PIM performance. The structural features of the phase shifter of this invention are: combining cables and metal welding terminals into a repairable assembly that is easy to weld and disassemble; this assembly is connected to the phase shifter cavity by screws through a reliable contact structure; simultaneously, it achieves bend-free welding between the core wire of the coaxial cable and the circuit PCB board to meet the low intermodulation design of the phase shifter; the coaxial cable outside the cavity is arranged at an angle of 15° to 30° with the length direction of the phase shifter cavity, which significantly shortens the minimum spacing between the phase shifter ports, thereby reducing the length of the phase shifter and avoiding excessive wiring space. Attached Figure Description

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention.

[0042] Figure 1 A structural diagram of a dielectric phase shifter provided by the present invention;

[0043] Figure 2 A cross-sectional structural diagram of the housing of a dielectric phase shifter provided by the present invention;

[0044] Figure 3 A side view of the housing of a dielectric phase shifter provided by the present invention;

[0045] Figure 4 A circuit board and dielectric board structure diagram of a dielectric phase shifter provided by the present invention;

[0046] Figure 5 A structural diagram of a limiting card for a dielectric phase shifter provided by the present invention;

[0047] Figure 6 A schematic diagram of a cable welding terminal structure for a dielectric phase shifter provided by the present invention;

[0048] Figure 7 A side view of the cable welding terminal of a dielectric phase shifter provided by the present invention;

[0049] Figure 8 A schematic diagram of a terminal mounting base structure for a dielectric phase shifter provided by the present invention;

[0050] Figure 9 This is a schematic diagram illustrating the assembly sequence of a dielectric phase shifter provided by the present invention.

[0051] Explanation of reference numerals in the attached figures

[0052] 1: Outer shell; 11: Functional shielding wall; 111: Limiting boss; 112: Threaded hole; 113: Positioning hole; 114: Oblong through hole; 115: Positioning through hole; 12: First rectangular cavity; 121: First limiting notch; 13: Third rectangular cavity; 131: Second limiting notch; 14: Second rectangular cavity; 141: Limiting rib; 142: Solid wall; 15: Shielding wall; 2: Circuit board; 21: Phase shifting circuit; 22: Welding port; 23: Slide groove; 24: Boss; 25: Third limiting rib 3: Notch; 4: Medium plate; 5: Pin; 6: Hole; 7: Limiting clip; 8: Guide wall; 9: Limiting wall; 10: Limiting groove; 11: Cylindrical pin; 12: Cable welding terminal; 13: Limiting ring; 24: Welding groove; 35: Cable; 46: Circular boss; 57: Mounting through hole; 8: Terminal fixing seat; 9: Limiting hole; 10: First buckle; 11: Second buckle; 12: Semi-enclosed protective wall; 13: First limiting wall; 14: Cylindrical pin; 15: Second limiting wall. Detailed Implementation

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0054] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "a" not only means "only one," but also supports the use of "more than one."

[0055] The dielectric phase shifter proposed in this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description and claims.

[0056] Example

[0057] See Figures 1 to 9 This embodiment provides a dielectric phase shifter, including a housing 1, a circuit board 2, a dielectric board 3, a limiting clip 4, and a cable welding terminal 5.

[0058] First, see Figures 1 to 3The outer shell 1 of this embodiment will be described in detail below. The outer shell 1 is a pultruded rectangular tubular profile. The outer shell 1 can be regarded as being formed by the long sides of four rectangular shielding walls 15 being closed and connected in sequence, with openings at both ends. The inner side of the outer shell 1 has a first rectangular cavity 12, a second rectangular cavity 14, and a third rectangular cavity 13 that pass through both ends of the outer shell 1 from top to bottom. Among them, the first rectangular cavity 12 and the third rectangular cavity 13 are working shielding cavities. The first rectangular cavity 12 and the third rectangular cavity 13 are the same in size, function, and structure except for their spatial position. The second rectangular cavity 14 is a fixed cavity located between the first rectangular cavity 12 and the third rectangular cavity 13. The upper top plate of the first rectangular cavity 12 is the top shielding wall of the outer shell 1. The lower bottom plate of the first rectangular cavity 12 is the upper top plate of the second rectangular cavity 14. The lower bottom plate of the second rectangular cavity 14 is the upper top plate of the third rectangular cavity 13. The lower bottom plate of the third rectangular cavity 13 is the bottom shielding wall of the outer shell 1.

[0059] At least one limiting rib 141 is designed on the side wall along the width direction of the shell cross section inside the upper top plate or lower bottom plate of the second rectangular cavity 14. The limiting rib 141 cooperates with the limiting clip 4 to fix the circuit board 2.

[0060] The side plates on both sides of the first rectangular cavity 12, the second rectangular cavity 14, and the third rectangular cavity 13 are the shielding walls 15 on both sides of the outer casing 1. Additionally, see... Figure 3 The positioning through holes 115 opened on the top shielding wall 15 and the bottom shielding wall 15 are fixed in conjunction with the limiting clip 4.

[0061] Among them, the shielding wall 15 on one side of the outer shell 1 is a functional shielding wall 11. The functional shielding wall 11 is perpendicular to the top shielding wall and the bottom shielding wall, and is slightly thicker than the other three shielding walls 15. A limiting boss 111 is provided on the outer side of the functional shielding wall 11. The width of the limiting boss 111 is slightly smaller than the cross-sectional width of the outer shell 1. An oblong through hole 114 is machined on the surface of the limiting boss 111. A pair of oblong through holes 114 are respectively connected to the first rectangular cavity 12 and the third rectangular cavity 13, and the number of such pairs is not less than three. Figure 3 The oblong through-hole 114 indicated by the middle mark is connected to the third rectangular cavity 13. Note that... Figure 2 and Figure 3They are inverted. The second rectangular cavity 14 is also provided with a solid wall 142 at least 8mm thick on the side near the functional shielding wall 11. The outer middle position of the functional shielding wall 11 has a threaded hole 112 and a positioning hole 113 extending into the solid wall 142, and is located approximately between the upper and lower pairs of elongated through holes 114, for installing and fixing the cable 53 welding terminal 5 and fixing the terminal fixing seat 6. On the inner side of the functional shielding wall 11, the first rectangular cavity 12 and the third rectangular cavity 13 are respectively designed with an elongated first limiting notch 121 and a second limiting notch 131. The paths of the first limiting notch 121 and the second limiting notch 131 pass through the corresponding elongated through holes 114, and the first limiting notch 121 and the second limiting notch 131 are used to limit and fix the circuit board 2 that is subsequently placed in.

[0062] See Figure 4 The circuit board 2 is provided with a phase-shifting circuit 21, a through-type groove 23, several welding ports 22 located on the same side, and bosses 24 and third limiting notches 25 at both ends of the circuit board 2. The circuit board 2 is clamped between two dielectric boards 3. Specifically, one dielectric board 3 is provided with a locking pin 31, and the other is provided with a corresponding locking hole 32. The two dielectric boards 3 move towards each other and insert the locking pin 31 into the locking hole 32 through the groove 23. Due to the groove 23, the circuit board 2 and the locking pin 31 are slidably connected, and the circuit board 2 can still slide relative to the dielectric board 3 after being fastened. After the circuit board 2 and the dielectric boards 3 on the upper and lower sides are fastened together, one side of the circuit board 2 is pushed into the working shielding cavity along the first limiting notch 121 or the second limiting notch 131 (both the first rectangular cavity 12 and the second rectangular cavity 14 need to contain the circuit board 2). After being fully pushed in, the two ends of the circuit board are aligned with the two ends of this embodiment. Next, push the bosses 24 at both ends of the circuit board 2 so that the soldering ports 22 protruding from the long side of the circuit board 2 correspond one-to-one with the elongated through holes 114 and pass through the outer shell 1, extending to the outside of the cavity with a protrusion length of not less than 5mm. Subsequently, the protruding soldering ports 22 will be electrically connected to the core wires of the cable 53 soldered on the soldering terminal 5. The limiting notch is used to cooperate with the limiting clip 4 to fix the circuit board 2.

[0063] See Figure 5The limiting clip 4 is connected to the circuit board 2, the fixing cavity, and the outer shell 1 respectively, and is used to fix the circuit board 2. In this embodiment, the limiting clip 4 can be regarded as a "mountain" shaped structure, with a guide wall 41 in the middle, two recessed limiting grooves 43 on both sides of the guide wall 41, and a limiting wall 42 on the outer side of the two limiting grooves 43. A cylindrical pin 44 is provided on the side of the limiting wall 42 near the guide wall 41. When using the limiting clip 4, the guide wall 41 is pushed in along the limiting rib 141 of the second rectangular cavity 14 until it contacts the limiting grooves 43 on both sides of the guide wall 41 and the third limiting notch 25 of the circuit board 2. At the same time, the cylindrical pin 44 on the limiting wall 42 cooperates with the positioning through hole 115 on the outer shell 1 to complete the assembly and achieve the purpose of limiting the movement of the circuit board 2 in the cavity.

[0064] See Figure 8 This embodiment also includes a terminal fixing seat 6, which is made of high-strength plastic. The number of terminal fixing seats 6 is the same as the number of pairs of oblong through holes 114. For ease of description, the terminal fixing seat 6 is disassembled as follows: First, there is a base plate with a circular through hole. A cylindrical pin 66 is provided on one side of the base plate, and a limiting hole 61, a semi-enclosed protective wall 64, and a buckle are provided on the other side of the base plate.

[0065] The limiting hole 61 engages with the bottom surface of the cable welding terminal 5 for positioning. Simultaneously, the semi-enclosed protective wall 64 surrounding the terminal fixing seat 6 encloses the outside of the cable welding terminal 5 to restrict rotation. The latches, divided into a first latch 62 and a second latch 63, are used to clamp the terminal fixing seat 6 onto the cable welding terminal 5, preventing it from falling off. The cylindrical pin 66 of the terminal fixing seat 6 engages with the positioning hole 113 on the functional shielding wall 11 for positioning. Preferably, a pair of vertical first connecting limiting walls 65 and second connecting limiting walls 67 are also provided on one side of the base plate, extending in the opposite direction to the semi-enclosed protective wall 64 at the same position. These first connecting limiting walls 65 and second connecting limiting walls 67 engage with both sides of the limiting boss 111 to pre-fix the terminal fixing seat 6 to the functional shielding wall 11. Its circular through hole corresponds to the threaded hole 112, allowing the terminal fixing seat 6 to be bolted to the functional shielding wall 11.

[0066] See Figure 6 and Figure 7The cable welding terminal 5 is a metal part with a solderable metal coating on its surface. Structurally, it includes a cable 53, a connector, a pair of cable welding grooves 52 on both sides of the connector, and a limiting ring 51 located at the front end of the cable welding grooves 52. The dielectric layer of the cable 53 passes through the limiting ring 51 until the outer conductor of the cable 53 contacts the surface of the limiting ring 51 and is soldered to it. The bottom surface of the connector has an annular boss 54 and a cylindrical pin 44. The annular boss 54 has a mounting through hole 55 in the middle. Metal mounting screws pass through the mounting through hole 55 to assemble the cable welding terminal 5 onto the functional shielding wall 11. Figure 6 and Figure 7 As shown, the plane where the cable welding groove 52 and the annular boss 54 are located is set at an angle of 15 to 30 degrees, and the plane where the cable 53 and the annular boss 54 are located after welding is also set at an angle of 15 to 30 degrees.

[0067] See Figure 9 The installation steps of this embodiment are briefly described below. First, two dielectric plates 3 are used to clamp the circuit board 2, resulting in two clamping assemblies. Then, the two clamping assemblies are pushed into the first rectangular cavity 12 and the third rectangular cavity 13 along the first limiting notch 121 and the second limiting notch 131, respectively. The side of the circuit board 2 with the soldering port 22 is inserted close to the functional shielding wall 11. After complete insertion, the protrusions 24 at both ends of the circuit board 2 are pushed so that the soldering port 22 on the circuit board 2 corresponds one-to-one with the elongated through hole 114 and passes through the outer shell 1, extending to the outside of the cavity. Limiting clips 4 are inserted at both ends of this embodiment to restrict the movement of the circuit board 2 within the cavity.

[0068] Then, the cable welding terminal 5 and the terminal fixing seat 6 are assembled as components, and the cylindrical pin 44 of the cable welding terminal 5 is fastened to the limiting hole 61 of the terminal fixing seat 6. The cable welding terminal 5 and the terminal fixing seat 6 are then fixed to the functional shielding wall 11 with metal screws. At least 3 sets of cable welding terminals 5 are assembled on the outer casing 1. Finally, the coaxial cable 53 welded to the cable welding terminal 5 does not need to be bent, and the core wire of the cable 53 is directly welded to the welding port 22 of the circuit board 2 that extends out of the outer casing 1.

[0069] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A dielectric phase shifter, characterized in that, Includes the outer casing, circuit board, dielectric board, limit clamps, and cable welding terminals; The outer shell is a pultruded rectangular tubular profile, and the outer shell is a shielding wall that is closed and connected on four sides in sequence; the inner side of the outer shell has a first rectangular cavity, a second rectangular cavity and a third rectangular cavity that pass through both ends of the outer shell from top to bottom; the first rectangular cavity and the third rectangular cavity are working shielding cavities, and the second rectangular cavity is a fixed cavity; The shielding wall on one side of the outer casing is a functional shielding wall; the inner side of the functional shielding wall is provided with a limiting notch at the communication point with the working shielding cavity, and the limiting notch is provided with a plurality of elongated oval through holes; the outer side of the functional shielding wall is bolted to the cable welding terminal. The circuit board is provided with a through groove running vertically and several soldering ports located on the same side wall. The circuit board is clamped between two dielectric boards, which are connected by the sliding groove. After the circuit board and the dielectric boards on the upper and lower sides are fastened together, the circuit board is pushed into the working shielding cavity in conjunction with the limiting notch. After being fully pushed in, several welding ports correspond one-to-one with several oblong through holes and extend out of the outer shell. Several welding ports are electrically connected to the inner core of the cable soldered to the cable welding terminal. The limiting clips are respectively connected to the circuit board, the fixing cavity and the outer shell, and are used to fix the circuit board; The functional shielding wall is thicker than the other three shielding walls, and the functional shielding wall is the sidewall of the first rectangular cavity, the second rectangular cavity, and the third rectangular cavity; A solid wall is also provided between the functional shielding wall and the second rectangular cavity; The outer side of the functional shielding wall is provided with threaded holes and positioning holes extending to the solid wall for connecting and fixing the cable welding terminals.

2. The dielectric phase shifter according to claim 1, characterized in that, The cable welding terminal includes a cable, a connector, a pair of cable welding grooves on both sides of the connector, and a limiting ring located at the front end of the cable welding groove. The dielectric layer of the cable passes through the limiting ring until the outer conductor of the cable contacts the surface of the limiting ring, and is soldered to the limiting ring. The bottom surface of the connector is provided with an annular boss and a cylindrical pin. The annular boss has a mounting through hole in the middle. The mounting through hole cooperates with the threaded hole of the functional shielding wall to assemble the cable welding terminal onto the functional shielding wall.

3. The dielectric phase shifter according to claim 2, characterized in that, The cable welding groove is set at an angle of 15 to 30 degrees to the plane where the annular boss is located, and the cable is also set at an angle of 15 to 30 degrees to the plane where the annular boss is located.

4. The dielectric phase shifter according to claim 2, characterized in that, It also includes a terminal fixing base, which includes a base plate with a circular through hole, a cylindrical pin on one side of the base plate, a limiting hole, a semi-enclosed protective wall, and a buckle on the other side of the base plate. The mounting through hole, the circular through hole, and the threaded hole are correspondingly provided. The cylindrical pin is connected to the corresponding positioning hole, and the limiting hole is connected to the corresponding cylindrical pin. This is used to connect the cable welding terminal to the functional shielding wall bolt via the terminal fixing seat. The buckle is used to connect the terminal fixing seat to the cable welding terminal buckle; The semi-enclosed protective wall is used to wrap around the outside of the cable welding terminal to restrict rotation.

5. The dielectric phase shifter according to claim 4, characterized in that, A pair of connecting limiting walls are also provided on one side of the base plate; The outer side of the functional shielding wall is also provided with a limiting boss, and several of the oblong through holes are provided on the limiting boss. The connecting limiting wall, in conjunction with the limiting boss, is used to pre-fix the terminal fixing seat and the functional shielding wall.

6. The dielectric phase shifter according to claim 1, characterized in that, The circuit board is also provided with bosses and limiting notches at both ends; By pushing the boss to move the circuit board, several of the welding ports pass through several corresponding elongated through holes on the outer casing and extend to the outside of the working shielding cavity; The limiting notch cooperates with the limiting clip to fix the circuit board.

7. The dielectric phase shifter according to claim 6, characterized in that, The upper top plate or lower bottom plate of the fixing cavity is provided with at least one limiting rib along the pushing direction of the circuit board. The limiting rib cooperates with the limiting clip to fix the circuit board.

8. The dielectric phase shifter according to claim 7, characterized in that, The limiting clip has a guide wall in the middle, and the guide wall is pushed in along the limiting rib of the fixing cavity for connection with the fixing cavity; The guide wall has limiting grooves on both sides, which cooperate with the limiting notch of the circuit board for connection with the circuit board; The limiting card has limiting walls on both sides, and a cylindrical pin is provided on the side of the limiting wall near the guide wall. The cylindrical pin cooperates with the positioning through holes opened on the upper and lower shielding walls to connect with the outer shell, thereby fixing the circuit board after it is pushed in.

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