Single-pole eight-throw coaxial switch

Abstract

The invention discloses a single-pole eight-throw coaxial switch, and belongs to the technical field of microwaves. According to the 67GHz single-pole eight-throw coaxial switch, the 1.85 mm coaxial transmission line and the edge line transmission line are adopted to form a microwave transmission system of the 67GHz single-pole eight-throw coaxial switch, and the 67GHz single-pole eight-throw coaxial switch is realized; a 7-shaped microwave transmission system is adopted, and a single-pole eight-throw coaxial switch with a load is realized on the premise that the size of the coaxial switch is not increased; the transmission reed and the push rod form a push rod assembly, the push rod assembly is limited by a pin on the cover plate, and the friction position of the push rod in the moving process is transferred out of the microwave cavity, so that poor contact caused by transfer to the contact position after redundancy generated by friction is avoided; the push rod assembly is limited by the pin, so that the limiting precision is high; the load of the on-load single-pole eight-throw coaxial switch is realized by adopting a load sheet, and the load sheet has the advantages of simple structure, high working frequency, good standing wave, low cost and the like; and coaxial loading can also be adopted, so that assembly and disassembly are facilitated.

Description

Technical Field

[0001] The invention belongs to the field of microwave technology, and in particular relates to a single-pole eight-throw coaxial switch. Background Art

[0002] RF coaxial switch is a passive component that can transmit and switch RF signals. It has the advantages of low insertion loss and high isolation, and can transmit high-power RF signals with low loss and no distortion. As an indispensable component in RF signal transmission systems, RF coaxial switches are widely used in test instruments, switch matrices, automatic test systems and other fields.

[0003] The current single-pole eight-throw coaxial switch can only achieve a transmission frequency of 50 GHz and cannot achieve the transmission and switching of higher frequency microwave signals.

[0004] Disadvantages of existing technology:

[0005] The maximum operating frequency range of the existing single-pole eight-throw coaxial switch is only DC-50GHz, and it is difficult for the single-pole eight-throw coaxial switch to transmit DC-67GHz frequency signals;

[0006] Existing multi-throw coaxial switches usually use internal limiting solutions such as limit posts to limit the transmission reed in the microwave transmission cavity. During the movement of the transmission reed, the friction with the limit posts will produce excess matter. If the excess matter moves to the contact point where the end face of the inner conductor contacts the transmission reed, the repeatability of the coaxial switch will deteriorate, or even the switch will fail.

[0007] It is not possible to realize a 67GHz loaded single-pole eight-throw coaxial switch. Summary of the invention

[0008] In view of the above technical problems existing in the prior art, the present invention proposes a single-pole eight-throw coaxial switch, which has a reasonable design, overcomes the shortcomings of the prior art and has good effects.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] A single-pole eight-throw coaxial switch includes a microwave transmission system, wherein the microwave transmission system includes a cavity assembly and a cover assembly; wherein:

[0011] The cavity assembly includes a cavity and a connector, and the connectors are evenly distributed on the cavity at intervals of 45°;

[0012] The cover plate assembly comprises a cover plate, a push rod assembly, a dummy load and a transmission reed; the push rod assembly, the dummy load and the transmission reed are evenly distributed on the cover plate at intervals of 45 degrees.

[0013] Preferably, the connector uses a 1.85 mm coaxial transmission line, and the operating frequency can reach 67 GHz.

[0014] Preferably, a microwave transmission cavity is provided on the cavity body, which forms an edge line transmission line with the transmission reed in the cover plate assembly, and the operating frequency can reach 67 GHz.

[0015] Preferably, a spring is provided in the middle portion of the push rod assembly for automatically resetting the push rod assembly.

[0016] Preferably, the push rod assembly adopts an external limit structure, including a transmission reed and a push rod; the push rod includes a first push rod and a second push rod, the first push rod and the second push rod are bonded together, and the second push rod passes through the cover plate and is bonded to the transmission reed to form a push rod assembly.

[0017] Preferably, two guide holes are provided on the first push rod, which cooperate with the pins on the cover plate to limit the push rod assembly so that the push rod assembly can only move up and down.

[0018] Preferably, 8 push rod assemblies are provided.

[0019] Preferably, if the single-pole eight-throw coaxial switch is equipped with a load, a 7-shaped microwave transmission cavity is provided on the cavity, and the load sheet is bonded to the cavity or the coaxial load is screwed onto the cavity to realize the load function; if a load sheet is used to realize the load function, the load sheet uses alumina ceramic as a substrate and is processed by a thin film circuit process, and the operating frequency can reach 67 GHz; if a coaxial load is used, the operating frequency can reach 67 GHz.

[0020] Preferably, if the single-pole eight-throw coaxial switch carries a load, a push rod assembly of the load is added to the cover plate assembly. The structure of the push rod assembly of the load is similar to the push rod assembly of the transmission path, and both adopt an external limit structure to transfer the friction position of the load push rod assembly during movement to outside the transmission cavity.

[0021] Preferably, the outer limit structure of the transmission spring of the transmission path and the transmission spring of the load path includes a conical spring solution, a double spring solution, a triple spring solution, and a single spring and contact cap solution.

[0022] Beneficial technical effects brought by the present invention:

[0023] (1) A 67 GHz single-pole eight-throw coaxial switch microwave transmission system is constructed by using 1.85 mm coaxial transmission line and edge line transmission line to realize a 67 GHz single-pole eight-throw coaxial switch.

[0024] (2) A figure-7 microwave transmission system is used to realize a single-pole eight-throw coaxial switch with load without increasing the size of the coaxial switch.

[0025] (3) The transmission reed and the push rod constitute a push rod assembly. The push rod assembly is limited by the pins on the cover plate to transfer the friction position of the push rod during the movement process to the outside of the microwave cavity, so as to avoid the excess friction from being transferred to the contact position and causing poor contact. The pins are used to limit the push rod assembly, which has the advantage of high limiting accuracy and can ensure the consistency of indicators such as standing wave and insertion loss each time the coaxial switch is switched.

[0026] (4) The load of the single-pole eight-throw coaxial switch with load is realized by a load sheet, which has the advantages of simple structure, high operating frequency, good standing wave, and low cost. It can also be realized by a coaxial load, which is easy to assemble and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the structural diagram of a single-pole eight-throw coaxial switch;

[0028] Figure 1 (a) is a schematic diagram of the overall structure of the switch; (b) is a view of the switch from bottom to top, showing that 8 paths are evenly distributed at 4° intervals;

[0029] Figure 2 It is a schematic diagram of the structure of the relay assembly;

[0030] Figure 2 (a) is a bottom view of the electromagnetic assembly and the rotating assembly; (b) is a schematic diagram of the electromagnetic assembly and the rotating assembly;

[0031] Figure 3 This is a structural diagram of a single-pole eight-throw coaxial transmission line assembly;

[0032] Figure 4 It is a cross-sectional view of a single-pole eight-throw coaxial transmission line assembly;

[0033] Figure 5 It is a schematic diagram of the cavity assembly structure;

[0034] Figure 6 It is a schematic diagram of the cover plate assembly structure;

[0035] Figure 6 (a) is a top view of the cover plate assembly of the unloaded coaxial switch; (b) is a bottom view of the cover plate assembly of the unloaded coaxial switch;

[0036] Figure 7 is a schematic diagram of the cover plate structure;

[0037] Figure 8 Schematic diagram of the push rod structure;

[0038] Fig. 9 It is a schematic diagram of the structure of a relay assembly (with a load switch);

[0039] Fig.10It is a cross-sectional view of the load path push rod assembly;

[0040] Fig.11 It is a schematic diagram of the structure of the thin film support sheet;

[0041] Fig.12 is a cross-sectional view of a transmission line assembly;

[0042] Fig.13 It is a schematic diagram of the structure of the cavity assembly (with load switch);

[0043] Fig.14 This is a schematic diagram of the cover assembly (with load switch);

[0044] Fig.14 (a) is a top view of the cover plate assembly of the loaded coaxial switch; (b) is a bottom view of the cover plate assembly of the loaded coaxial switch. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0046] like Figure 1-4 As shown, the single-pole eight-throw coaxial switch of the present invention is mainly composed of a circuit system, an electromagnetic system, and a microwave system. Since each path of the single-pole eight-throw coaxial switch is the same, the first path is taken as an example for explanation: when the first path is powered on, the relay of the first path in the electromagnetic drive system rotates and switches, so that the first path relay presses down the push rod assembly of the first path, and the spring is compressed, so that the transmission reed contacts the inner conductor of the intermediate connector and the peripheral connector. At this time, the first path of the coaxial switch is turned on, and the signal is input from the intermediate connector and output from the first path peripheral connector. When the switch is not powered on, the push rod assembly moves upward under the reset force of the spring, and the transmission reed with the transport is disconnected from the inner conductor of the intermediate connector and the peripheral connector. At this time, the first path of the coaxial switch is disconnected.

[0047] The microwave transmission system is mainly composed of a cavity assembly and a cover assembly.

[0048] like Figure 5 As shown, the cavity assembly is mainly composed of a cavity and a connector. The connector uses a 1.85mm coaxial transmission line, and the operating frequency can reach 67GHz. At the same time, the connectors are evenly distributed on the cavity at 45° intervals, as shown in FIG. Figure 5 As shown;

[0049] A microwave transmission cavity is processed on the cavity body, which forms an edge line transmission line with the transmission reed in the cover plate assembly, and the operating frequency is 67GHz.

[0050] like Figure 6-7As shown, the cover plate assembly is mainly composed of a cover plate, a push rod assembly, a dummy load, etc. 8 groups of push rod assemblies, dummy loads, and transmission springs are evenly distributed on the cover plate at intervals of 45 degrees. Push rods 1 and 2 are bonded together, and push rod 2 passes through the cover plate and is bonded together with the transmission spring to finally form a push rod assembly; a spring is placed in the middle of the push rod assembly for automatic reset of the push rod assembly; push rod 1 is provided with two guide holes (such as Figure 8 As shown), the push rod assembly is precisely limited in cooperation with the cover pin so that the push rod assembly can only move up and down. At this time, the friction position of the push rod assembly during movement is outside the transmission cavity, which avoids the excess material generated by friction from entering the transmission cavity and improves the repeatability and life of the coaxial switch.

[0051] According to actual design needs, the external limit solution can be modified in many ways, such as conical spring solution, double spring solution, triple spring solution, single spring + contact cap solution, etc.

[0052] For a single-pole eight-throw coaxial switch with load, such as Figure 9-14 shown.

[0053] The electromagnetic system of a single-pole eight-throw coaxial switch with load is similar to the structure of a coaxial switch without load. The difference is that the electromagnetic component and the rotating component rotate a certain angle along the axis of the electromagnetic component, so that the compression spring on the rotating component contacts the push rod components of the transmission path and the load path respectively.

[0054] The microwave transmission system is similar to the coaxial switch without load, and both use an external limit structure. The difference is:

[0055] 1. A 7-shaped microwave transmission cavity is processed on the cavity, and then a load sheet is bonded to the cavity or a coaxial load is screwed on the cavity to realize the load function; if a load sheet is used to realize the load function, the load sheet can be made of alumina ceramic as the substrate, and the load sheet is processed by thin film circuit technology, and the operating frequency can reach 67GHz; if a coaxial load is used, the operating frequency can reach 67GHz. This solution can be applied to coaxial switch products with loads in frequency bands such as 18GHz, 26.5GHz, 40GHz, 50GHz, and 90GHz.

[0056] 2. A push rod assembly for the load is added to the cover assembly. When the push rod assembly of the transmission path is in the reset state, the push rod assembly of the load is pressed down, and the transmission reed contacts the inner conductor and the load sheet (or the inner conductor of the coaxial load), then the load is connected. The structure of the push rod assembly of the load is similar to that of the push rod assembly of the transmission path. Both use an external limit structure to transfer the friction position of the load push rod assembly during movement to the outside of the transmission cavity, avoiding the excess generated by friction from entering the transmission cavity and improving the repeatability and life of the coaxial switch. Similar to the switch without load, the external limit structure of the load path transmission reed can also be modified in various ways.

[0057] The key points of the present invention are:

[0058] Microwave transmission system of 1.67GHz single-pole eight-throw coaxial switch: 1.85mm coaxial transmission line and edge line transmission line are used to form the microwave transmission system of 67GHz single-pole eight-throw coaxial switch.

[0059] 2. 7-shaped microwave transmission system: The 7-shaped microwave transmission system is used to realize a single-pole eight-throw coaxial switch with load without increasing the volume of the coaxial switch.

[0060] 3. External limit structure solution: The transmission reed and the push rod constitute a push rod assembly, and the push rod assembly is limited by the pins on the cover plate to transfer the friction position of the push rod during the movement process to the outside of the microwave cavity to avoid the excess friction from being transferred to the contact position and causing poor contact; the push rod assembly is limited by pins, which has the advantage of high limiting accuracy and can ensure the consistency of indicators such as standing wave and insertion loss each time the coaxial switch is switched.

[0061] 4. Load scheme of coaxial switch with load: The load of single-pole eight-throw coaxial switch with load can be realized by load sheet, which has the advantages of simple structure, high operating frequency, good standing wave and low cost; it can also be realized by coaxial load, which has the advantage of easy disassembly and assembly.

[0062] Protection points of the present invention:

[0063] 1. A microwave transmission system of a 67GHz single-pole eight-throw coaxial switch is constructed using 1.85mm coaxial transmission line and edge line transmission line.

[0064] 2. Figure 7 microwave transmission system with single-pole eight-throw coaxial switch with load.

[0065] 3. External limit structure of the push rod assembly: The transmission reed and the push rod constitute the push rod assembly, and the push rod assembly is limited by the pins on the cover plate to transfer the friction position of the push rod during the movement process to the outside of the microwave cavity to avoid the excess friction from being transferred to the contact position and causing poor contact; the pins are used to limit the push rod assembly, which has the advantage of high limiting accuracy and can ensure the consistency of indicators such as standing wave and insertion loss each time the coaxial switch is switched.

[0066] 4. The load of the single-pole eight-throw coaxial switch with load can be realized by using a load sheet, which has the advantages of simple structure, high operating frequency, good standing wave, and low cost; it can also be realized by using a coaxial load, which has the advantage of easy disassembly and assembly.

[0067] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A single-pole eight-throw coaxial switch, characterized in that: It includes a microwave transmission system, which includes a cavity assembly and a cover assembly; wherein, The cavity assembly includes a cavity and a connector, and the connectors are evenly distributed on the cavity at intervals of 45°; The cover plate assembly comprises a cover plate, a push rod assembly, a dummy load and a transmission reed; the push rod assembly, the dummy load and the transmission reed are evenly distributed on the cover plate at intervals of 45 degrees.

2. The single-pole eight-throw coaxial switch according to claim 1, characterized in that: The connector uses a 1.85mm coaxial transmission line and the operating frequency can reach 67GHz.

3. The single-pole eight-throw coaxial switch according to claim 1, characterized in that: A microwave transmission cavity is arranged on the cavity body, which forms an edge line transmission line with the transmission spring in the cover plate assembly, and the operating frequency can reach 67 GHz.

4. The single-pole eight-throw coaxial switch according to claim 1, characterized in that: A spring is arranged in the middle of the push rod assembly for automatically resetting the push rod assembly.

5. The single-pole eight-throw coaxial switch according to claim 1, characterized in that: The push rod assembly adopts an external limit structure, including a transmission reed and a push rod; the push rod includes a first push rod and a second push rod, the first push rod and the second push rod are bonded together, and the second push rod passes through the cover plate and is bonded to the transmission reed to form a push rod assembly.

6. The single-pole eight-throw coaxial switch according to claim 5, characterized in that: The first push rod is provided with two guide holes, which cooperate with the pins on the cover plate to limit the push rod assembly so that the push rod assembly can only move up and down.

7. The single-pole eight-throw coaxial switch according to claim 1, characterized in that: There are 8 sets of push rod assemblies.

8. The single-pole eight-throw coaxial switch according to claim 1, characterized in that: If the single-pole eight-throw coaxial switch is equipped with a load, a 7-shaped microwave transmission cavity is set on the cavity, and the load sheet is bonded to the cavity or the coaxial load is screwed on the cavity to realize the load function; if a load sheet is used to realize the load function, the load sheet uses alumina ceramic as the base material and is processed by thin-film circuit technology, and the operating frequency can reach 67GHz; if a coaxial load is used, the operating frequency can reach 67GHz.

9. The single-pole eight-throw coaxial switch according to claim 1, characterized in that: If the single-pole eight-throw coaxial switch carries a load, a push rod assembly of the load is added to the cover assembly. The structure of the push rod assembly of the load is similar to the push rod assembly of the transmission path. Both use an external limit structure to transfer the friction position of the load push rod assembly during movement to outside the transmission cavity.

10. The single-pole eight-throw coaxial switch according to claim 1, characterized in that: The external limiting structure of the transmission reed of the transmission path and the transmission reed of the load path includes a conical spring solution, a double spring solution, a triple spring solution, and a single spring and contact cap solution.

Images