SPnT surface-mounted microwave mechanical switch

Abstract

The invention relates to an SPnT surface-mounted microwave mechanical switch, and relates to the technical field of microwave switches, the microwave mechanical switch comprises a metal substrate, a plurality of micro coaxial transmission lines are arranged in the metal substrate, the length direction of the micro coaxial transmission lines is arranged along the thickness direction of the metal substrate, and the two ends of the micro coaxial transmission lines penetrate through the metal substrate; the radio frequency communication mechanism comprises a plurality of radio frequency reeds, one radio frequency reed is correspondingly arranged between every two adjacent micro coaxial transmission lines, the radio frequency reeds and the metal substrate are arranged in parallel at intervals, and linkage pieces are arranged on the radio frequency reeds; the electromagnetic driving mechanisms and the radio frequency reeds are arranged in a one-to-one correspondence mode, the electromagnetic driving mechanisms are connected with the corresponding linkage pieces, and the electromagnetic driving mechanisms are used for driving the radio frequency reeds to be in lap joint with the two corresponding micro-coaxial transmission lines. The microwave mechanical switch provided by the invention can be suitable for application scenes with relatively high requirements on high-frequency performance.

Description

Technical Field

[0001] The present application relates to the technical field of microwave switches, and in particular to an SPnT surface-mount microwave mechanical switch. Background Art

[0002] The SPnT surface-mount microwave mechanical switch is an electronic component used for switching high-frequency and microwave signals and is widely used in communications, test and measurement, and radar systems. "SPnT" (single pole n-throw) stands for single-pole, multiple-throw (SPMT), meaning one input and multiple outputs. In "SPnT," n is a variable representing the number of "multi-throw" components of the switch, or the number of outputs. For example, if n is 2, it represents an SP2T surface-mount microwave mechanical switch, meaning a single-pole, double-throw (SPDT) switch. Similarly, if n is 3, it represents a single-pole, three-throw (SPTT) switch.

[0003] Existing microwave mechanical switches are key components for switching signal paths in radio frequency systems, and their core function is to change the electromagnetic wave transmission path through mechanical contact. At present, the size of microwave mechanical switches restricts product development. In order to reduce the size of radio frequency mechanical switches, existing microwave mechanical switches use microstrip transmission lines in the radio frequency part, and the radio frequency interface uses a half-hole side structure. Specifically, the Chinese patent with publication number CN113346204A discloses a single-pole double-throw coplanar waveguide type radio frequency mechanical switch structure. The main technical solution disclosed is: the circular coaxial transmission line and rectangular transmission line parts of the traditional radio frequency switch are replaced by the microstrip surface of the coplanar waveguide structure. Such a design reduces the size of the microwave mechanical switch to a certain extent.

[0004] Regarding the aforementioned related technologies, since the characteristic impedance of a microstrip line is closely related to factors such as line width, dielectric substrate thickness, and dielectric constant of the dielectric substrate, the parasitic capacitance and inductance effects of the microstrip line become more significant at high frequencies, which causes the characteristic impedance of the microstrip line to change. Consequently, in actual use, at higher frequencies, the characteristic impedance of the microstrip line deviates significantly from the standard impedance, which reduces the signal transmission efficiency and quality within the microstrip line. This makes microwave mechanical switches difficult to adapt to applications requiring high-frequency performance. Summary of the Invention

[0005] The present application provides an SPnT surface-mount microwave mechanical switch, the purpose of which is to alleviate the impedance mismatch problem of the microwave mechanical switch in the high frequency band, thereby optimizing the quality of radio frequency signal transmission, thereby increasing the upper frequency limit and application frequency limit of the microwave mechanical switch itself, and ultimately enabling the microwave mechanical switch to adapt to application scenarios with high high-frequency performance requirements.

[0006] The SPnT surface-mount microwave mechanical switch provided in this application adopts the following technical solution: An SPT surface-mount microwave mechanical switch comprises a metal substrate, wherein a plurality of micro-coaxial transmission lines are provided within the metal substrate, wherein the length directions of the micro-coaxial transmission lines are arranged along the thickness direction of the metal substrate, and both ends of the micro-coaxial transmission lines pass through the metal substrate; a radio frequency connection mechanism, wherein the radio frequency connection mechanism comprises a plurality of radio frequency reeds, wherein one radio frequency reed is provided between two adjacent micro-coaxial transmission lines, wherein the radio frequency reeds are arranged parallel to the metal substrate and spaced apart, and wherein the radio frequency reeds are provided with linkage members; and an electromagnetic drive mechanism, wherein the electromagnetic drive mechanism is provided in a one-to-one correspondence with the radio frequency reeds, the electromagnetic drive mechanism is connected to the corresponding linkage member, and the electromagnetic drive mechanism is used to drive the radio frequency reeds to overlap the corresponding two micro-coaxial transmission lines.

[0007] By adopting the above technical solution, first, with the cooperation of several micro-coaxial transmission lines, RF connection mechanisms and electromagnetic driving mechanisms on the metal substrate, the electromagnetic driving mechanism can drive the RF reed to overlap with the corresponding two micro-coaxial transmission lines. Therefore, under the drive of the electromagnetic driving mechanism, the RF reed can achieve conduction between the corresponding two micro-coaxial transmission lines, and can also cut off the conduction between the corresponding two micro-coaxial transmission lines, thus realizing the basic function of the microwave mechanical switch.

[0008] On this basis, since the micro-coaxial transmission line runs through the metal substrate, the RF signal interface on the microwave mechanical switch is located on the lower side of the metal substrate. When the lower side of the metal substrate is patched to the user RF board, the micro-coaxial transmission line can form a vertical RF signal transmission path between the microwave mechanical switch and the user RF board, thereby realizing vertical interconnection between the micro-coaxial transmission line on the microwave mechanical switch and the microstrip line on the user RF board, which enables the microwave mechanical switch of this application to be patch-mounted.

[0009] Since a straight signal transmission path is established by using a micro-coaxial transmission line, the coaxial switch RF transmission line is essentially miniaturized, thereby reducing the size of the micro-coaxial transmission line and the size of the entire microwave mechanical switch. Moreover, since the RF signal input interface on the metal substrate is led out to the back of the metal substrate through the micro-coaxial transmission line, this makes it easier for the microwave mechanical switch to be directly mounted on the user's RF board, which can further reduce the size of the microwave mechanical switch.

[0010] At the same time, since the signal transmission path is established by using micro-coaxial transmission lines, and the electromagnetic field distribution of micro-coaxial transmission lines is subject to geometric structure constraints based on their inherent coaxial structure, the sensitivity of micro-coaxial transmission line components to environmental parameters is relatively low compared to the sensitivity of microstrip line impedance to environmental parameters; the grounding system formed by the metal substrate and the user RF board suppresses edge field interference; and the straight signal transmission path can effectively eliminate the impedance mutation problem caused by its own bending. Therefore, the existence of these characteristics can alleviate the impedance mismatch problem of the microwave mechanical switch in the high frequency band of this application, thereby optimizing the quality of RF signal transmission, thereby improving the upper frequency limit and application frequency limit of the microwave mechanical switch itself, and ultimately making the microwave mechanical switch adaptable to application scenarios with high requirements for high-frequency performance.

[0011] Optionally, a plurality of pads are provided on a side of the metal substrate facing away from the electromagnetic driving mechanism, the pads are provided in one-to-one correspondence with the micro-coaxial transmission lines, and one end of the micro-coaxial transmission line is connected to the corresponding pad.

[0012] By adopting the above technical solution and setting a number of pads on the metal substrate, when the microwave mechanical switch is patched to the user RF board, the pads can achieve a stable connection between the corresponding micro-coaxial transmission line and the corresponding position of the user RF board, thereby ensuring the smooth flow of the signal transmission channel between the microwave mechanical switch and the user RF board, thereby improving the working stability and reliability of the microwave mechanical switch.

[0013] Optionally, a closed cavity is opened on one side of the metal substrate, several of the RF reeds are located in the closed cavity, and one end of the micro-coaxial transmission line extends into the closed cavity; a metal closing plate is provided on one side of the metal substrate, and the metal closing plate closes the closed cavity; the electromagnetic drive mechanism is located on the side of the metal closing plate away from the metal substrate, and the linkage passes through the metal closing plate.

[0014] By adopting the above technical solution, based on the setting of the metal substrate and the metal closing plate, the RF reed can be enclosed in the closed cavity, and the cooperation between the linkage and the electromagnetic drive mechanism ensures that the electromagnetic drive mechanism can drive the corresponding RF reed in the closed cavity, which ensures that the microwave mechanical switch can work normally.

[0015] Because the metal substrate and metal sealing plate are both highly conductive materials, when the RF reed is placed in the closed cavity, the metal substrate and metal sealing plate can reflect and absorb external electromagnetic interference, thereby reducing external interference. At the same time, the metal substrate and metal sealing plate can also suppress the external radiation of internal RF signals, which can reduce RF signal transmission loss and improve RF signal transmission quality. This can improve the signal transmission quality of the microwave mechanical switch.

[0016] Optionally, a plurality of drive grooves are opened on one side of the metal substrate, and the plurality of drive grooves constitute the closed cavity, and one end of the micro-coaxial transmission line extends into the corresponding drive groove; the drive grooves and the RF reeds are arranged in a one-to-one correspondence, and the length direction of the drive groove is arranged along the length direction of the corresponding RF reed, the RF reed is located in the corresponding drive groove, and the RF reed is spaced apart from the inner side wall of the corresponding drive groove.

[0017] By adopting the above technical solution, based on the opening of several drive slots, since the drive slots form a closed cavity, and each RF reed can be independently positioned in its corresponding closed slot, the signal transmission of the multiple RF reeds is independent of each other, which can optimize the signal transmission quality of the RF springs in the corresponding closed slots. In addition, since the RF reeds are located in their corresponding drive slots, the drive slots can constrain the movement trajectory of the corresponding RF reeds. Therefore, when the electromagnetic drive mechanism drives the RF reeds to move, the drive slots can prevent the RF reeds from deflecting, thereby preventing contact deviation between the RF reeds and the corresponding micro-coaxial transmission lines, thereby ensuring the performance and stability of the microwave mechanical switch.

[0018] Optionally, the linkage includes a connecting column and a driving spring piece, and a plurality of clearance holes are opened through the metal closing plate, the clearance holes are connected to the closed cavity, the connecting column and the clearance holes are arranged in a one-to-one correspondence, the connecting column and the corresponding clearance hole are slidably plugged into each other, and one end of the connecting column is connected to the corresponding RF spring, and the other end is connected to the driving spring piece; an installation spring ring is provided on the metal closing plate, and the installation spring ring is arranged parallel to the metal closing plate and spaced apart, and the driving spring is connected to the installation spring ring at one end along its own length direction, and the other end is connected to the corresponding connecting column; a magnetic sheet is provided on the driving spring, and the magnetic sheet is arranged opposite to the corresponding electromagnetic driving mechanism.

[0019] By adopting the above technical solution, the linkage member can connect the connecting post to the corresponding RF spring in the closed cavity through the cooperation of the connecting post and the clearance hole on the metal sealing plate. At the same time, the movement of the connecting post can drive the connection of the corresponding RF spring. Based on the configuration of the driving spring and the mounting spring ring, one end of the driving spring is connected to the corresponding connecting post and the other end is connected to the mounting spring ring. Therefore, under the elastic force of the driving spring and the mounting spring ring, the driving spring can automatically reset after the external force on it disappears.

[0020] A magnetic plate is mounted on the driving spring, facing the electromagnetic drive mechanism. Therefore, when the electromagnetic drive mechanism is powered, the electromagnetic force between the electromagnetic drive mechanism and the magnetic plate propels the corresponding driving spring, which in turn, under the action of the connecting column, causes the corresponding RF spring to move. Conversely, when the electromagnetic drive mechanism is powered off, the elastic force between the driving spring and the mounting spring ring causes the driving spring to automatically reset, which in turn, under the action of the connecting column, causes the corresponding RF spring to reset.

[0021] Therefore, with the cooperation of the electromagnetic driving mechanism and the linkage parts, the driving of the RF reed in the closed cavity can be achieved, thereby ensuring the stability and efficiency of the microwave mechanical switch signal transmission.

[0022] Optionally, the magnetic sheet and the connecting column are spaced apart along a length direction corresponding to the driving elastic sheet.

[0023] By adopting the above technical solution, since the magnetic sheet and the connecting column are spaced apart along the length direction of the corresponding driving spring sheet, the electromagnetic force applied by the electromagnetic driving mechanism on the driving spring sheet is separated from the impact force applied by the driving spring sheet on the RF reed, thereby avoiding the electromagnetic force directly impacting the RF reed. This makes the RF reed less susceptible to impact and moves more stably, thereby improving the stability and reliability of the connection between the RF reed and the micro-coaxial transmission line, ensuring the stability of signal transmission, and further improving the performance of the microwave mechanical switch.

[0024] Optionally, the clearance hole is a non-circular hole, and the shape of the connecting column is adapted to correspond to the clearance hole.

[0025] By adopting the above technical solution, the clearance hole adopts a non-circular hole setting, which can prevent the connecting column from rotating in the corresponding clearance hole, thereby preventing the connecting column from rotating and offsetting during the driving process of the RF reed, thereby ensuring the vertical alignment accuracy of the RF reed and the micro-coaxial transmission line, and avoiding impedance mismatch caused by alignment deviation.

[0026] Optionally, the plurality of micro-coaxial transmission lines include a central transmission line and an edge transmission line, wherein one central transmission line is provided and a plurality of edge transmission lines are provided, the plurality of edge transmission lines are arranged around the central transmission line, and the plurality of edge transmission lines are arranged in a circular ring; the RF reed is provided in one-to-one correspondence with the edge transmission lines, the RF reed is located between the central transmission line and the corresponding edge transmission line, and the RF reed is used to overlap with the central transmission line and the corresponding edge transmission line.

[0027] By adopting the above technical solution, based on the arrangement of several micro-coaxial transmission lines, when the center transmission line is used to input RF signals and the edge transmission lines are used to output RF signals, a microwave mechanical switch with single-point input and multiple-point output can be formed. Similarly, a microwave mechanical switch with single-point output and multiple-point input can also be formed. Therefore, the center transmission line and the circularly arranged edge transmission lines form a star topology, which can further reduce the size of the microwave mechanical switch compared to the linear arrangement of the existing technology. In addition, the symmetrical layout of multiple edge transmission lines in a circular ring can improve the impedance consistency of the transmission path between the center transmission line and each edge transmission line, thereby reducing high-frequency signal phase deviation and crosstalk.

[0028] Optionally, compensating chamfers are provided at the corners of the RF reed.

[0029] By adopting the above technical solution, compensating chamfers are opened at the corners of the RF reed, which can reduce the signal transmission path on the RF reed, reduce signal reflection and loss, and improve the signal transmission quality of the microwave mechanical switch.

[0030] In summary, this application includes at least one of the following beneficial technical effects: 1. This application can alleviate the impedance mismatch problem of microwave mechanical switches in the high-frequency band, thereby optimizing the quality of RF signal transmission, thereby increasing the upper frequency limit and application frequency limit of the microwave mechanical switch itself, and ultimately enabling the microwave mechanical switch to adapt to application scenarios with high requirements for high-frequency performance.

[0031] 2. This application establishes a straight signal transmission path within the microwave mechanical switch through the provision of a micro-coaxial transmission line, thereby shortening the signal transmission path, effectively reducing the size of the microwave mechanical switch, optimizing the signal transmission quality of the microwave mechanical switch, and alleviating the impedance mismatch problem of the microwave mechanical switch in the high frequency band, enabling the microwave mechanical switch to adapt to application scenarios with high requirements for high-frequency performance.

[0032] 3. This application avoids direct impact of electromagnetic force on the RF reed through the structural setting of the linkage part, which makes the RF reed less affected and the movement more stable, thereby improving the stability and reliability of the connection between the RF reed and the micro-coaxial transmission line, thereby improving the performance of the microwave mechanical switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the overall structure of the microwave mechanical switch of the present application.

[0034] Figure 2 It is a schematic cross-sectional structural diagram of the microwave mechanical switch of the present application.

[0035] Figure 3 This is a schematic diagram of the bottom structure of the microwave mechanical switch of the present application.

[0036] Figure 4 This is a schematic cross-sectional structural diagram of another position of the microwave mechanical switch of the present application.

[0037] Figure 5 It is a schematic diagram of the overall structure of the radio frequency reed of the present application.

[0038] Figure 6 It is a schematic diagram of the overall structure of the microwave mechanical switch with disassembled electromagnetic drive mechanism of the present application.

[0039] In the figure, 1. Metal substrate; 11. Solder pad; 12. Enclosed cavity; 121. Drive slot; 13. Metal enclosing plate; 131. Make-way hole; 2. Micro-coaxial transmission line; 21. Center transmission line; 22. Edge transmission line; 3. RF connection mechanism; 31. RF reed; 311. Compensating chamfer; 32. Linkage; 321. Connecting column; 322. Drive spring; 323. Magnetic sheet; 33. Installing spring ring; 4. Electromagnetic drive mechanism; 41. Installing skeleton; 42. Electromagnetic coil. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0041] A SPnT surface mount microwave mechanical switch, referring to Figure 1 and Figure 2 , comprising a metal substrate 1, which is arranged horizontally, and a radio frequency connection mechanism 3 and an electromagnetic drive mechanism 4 are arranged in sequence above the metal substrate 1. A plurality of micro-coaxial transmission lines 2 are embedded in the metal substrate 1, and the length direction of the micro-coaxial transmission lines 2 is arranged in the vertical direction, and both ends of the micro-coaxial transmission lines 2 pass through the metal substrate 1. The radio frequency connection mechanism 3 includes a plurality of radio frequency reeds 31, which are arranged parallel to the metal substrate 1 and spaced apart. Each end of the radio frequency reed 31 along its own length direction corresponds to a micro-coaxial transmission line 2. The electromagnetic drive mechanism 4 is arranged in a one-to-one correspondence with the radio frequency reed 31, and the electromagnetic drive mechanism 4 is connected to the corresponding radio frequency reed 31.

[0042] Reference Figure 1 and Figure 2 Driven by the electromagnetic drive mechanism 4, the corresponding RF reed 31 can move in the vertical direction. When the RF reed 31 moves downward, its two ends respectively contact the corresponding micro-coaxial transmission line 2, and the RF reed 31 now realizes the conduction between the two corresponding micro-coaxial transmission lines 2. Conversely, when the RF reed 31 moves upward, the RF reed 31 separates from the corresponding two micro-coaxial transmission lines 2, thereby cutting off the conduction between the two micro-coaxial transmission lines 2, thus realizing the function of a microwave mechanical switch.

[0043] Reference Figure 1 and Figure 2 In this design, the micro-coaxial transmission line 2 is vertically embedded within the metal substrate 1. Because the micro-coaxial transmission line 2 transmits RF signals, both the input and output RF signals within the microwave mechanical switch are transmitted along a straight vertical path. This shortens the signal transmission path and reduces signal transmission loss. Furthermore, the vertical arrangement of the micro-coaxial transmission line 2 significantly reduces lateral space usage and the overall size of the microwave mechanical switch.

[0044] Reference Figure 2 Since the metal substrate 1 is a highly conductive material, the Faraday cage effect allows the micro-coaxial transmission line 2 to be embedded within the metal substrate 1, reflecting and absorbing external electromagnetic interference while suppressing the outward radiation of internal radio frequency signals. Therefore, when the micro-coaxial transmission line 2 passes through the metal substrate 1, the metal substrate 1 possesses a shielding function, enabling it to suppress high-frequency electromagnetic interference. Furthermore, combined with the impedance continuity of the micro-coaxial transmission line 2, the microwave mechanical switch supports millimeter-wave frequency band applications, resolving the frequency upper limit issue caused by impedance mismatch in the high-frequency band in existing technologies.

[0045] Reference Figure 2 and Figure 3 A plurality of pads 11 are provided on the lower surface of the metal substrate 1 , and the pads 11 are fixedly connected to the metal substrate 1 . The pads 11 are arranged in one-to-one correspondence with the micro-coaxial transmission lines 2 , and the lower ends of the micro-coaxial transmission lines 2 are fixedly connected to the corresponding pads 11 .

[0046] Based on the setting of the pad 11 on the metal substrate 1, the pad 11 can serve as a surface-mount interface for the input and output of RF signals at the bottom of the microwave mechanical switch. Therefore, after the microwave mechanical switch is mounted on the user RF board, the micro-coaxial transmission line 2 in the microwave mechanical switch can be directly vertically interconnected with the microstrip line of the user RF board. This makes the signal transmission between the microwave mechanical switch and the user RF board along a straight path, which can reduce the impedance mutation caused by the bending of the signal transmission path between the microwave mechanical switch and the user RF board, and thus can achieve continuous impedance matching between the microwave mechanical switch in the microwave mechanical switch and the microstrip line on the user RF board, thereby improving the signal transmission quality.

[0047] Reference Figure 2 and Figure 4There are no fewer than two micro-coaxial transmission lines 2. The plurality of micro-coaxial transmission lines 2 include a central transmission line 21 and a plurality of edge transmission lines 22. The plurality of edge transmission lines 22 are arranged around the central transmission line 21 and in a circular arrangement. The RF reeds 31 are arranged one-to-one with the edge transmission lines 22. The length direction of the RF reeds 31 is arranged along the spacing between the corresponding edge transmission lines 22 and the central transmission line 21. Along their own length direction, one end of each RF reed 31 is arranged directly opposite the central transmission line 21, and the other end is arranged directly opposite the corresponding edge transmission line 22.

[0048] Based on the arrangement of several micro-coaxial transmission lines 2, with the center transmission line 21 used for inputting RF signals and the edge transmission lines 22 for outputting RF signals, a microwave mechanical switch with single-point input and multiple-point output can be formed. Similarly, a microwave mechanical switch with single-point output and multiple-point input can also be formed. Thus, the center transmission line 21 and the circularly arranged edge transmission lines 22 form a star topology, which can further reduce the size of the microwave mechanical switch compared to the linear arrangement of existing technologies.

[0049] In addition, the setting of the circular symmetrical layout can improve the impedance consistency of the transmission path between the central transmission line 21 and each edge transmission line 22, thereby reducing the phase deviation and crosstalk of high-frequency signals.

[0050] Reference Figure 2 and Figure 4 In this embodiment, five micro-coaxial transmission lines 2 are provided, namely, one central transmission line 21 and four edge transmission lines 22. Based on the coordinated arrangement of one central transmission line 21 and four edge transmission lines 22, the requirements of an SP4T patch-type microwave mechanical switch are met.

[0051] In this embodiment, refer to Figure 2 and Figure 4 In the microwave mechanical switch of the present application, the number of edge transmission lines 22 can be set according to actual needs, and a corresponding number of RF reeds 31 and electromagnetic drive mechanisms 4 can be provided, so that the structural design of the microwave mechanical switch of the present application meets the requirements of an SPnT surface-mount microwave mechanical switch. The number of edge transmission lines 22, RF reeds 31, and electromagnetic drive mechanisms 4 is n. When n is 2, the microwave mechanical switch of the present application is an SP2T surface-mount microwave mechanical switch, i.e., a single-pole double-throw surface-mount microwave mechanical switch; when n is 3, the microwave mechanical switch of the present application is an SP3T surface-mount microwave mechanical switch, i.e., a single-pole three-throw surface-mount microwave mechanical switch. Similarly, n can also be any positive integer not less than 1.

[0052] Reference Figure 2 and Figure 4The metal substrate 1 has a plurality of drive slots 121 formed on its upper side. The plurality of drive slots 121 are interconnected to form a closed cavity 12. A metal sealing plate 13 is provided on its upper side. The metal sealing plate 13 is connected to the metal substrate 1 and seals the closed cavity 12. The drive slots 121 are arranged in a one-to-one correspondence with the RF reeds 31, and the RF reeds 31 are located in corresponding drive slots 121.

[0053] Because the RF reeds 31 are located within the enclosed cavity 12 and the metal substrate 1 and metal sealing plate 13 are made of highly conductive materials, they can reflect and absorb external electromagnetic interference, thereby reducing external interference. Furthermore, the metal substrate 1 and metal sealing plate 13 can suppress the outward radiation of internal RF signals, thereby reducing RF signal transmission losses. Therefore, the creation of the enclosed cavity 12 effectively improves the quality of signal transmission on the RF reeds 31.

[0054] Reference Figure 2 and Figure 4 The driving grooves 121 are arranged in a one-to-one correspondence with the RF reeds 31. The length direction of the driving grooves 121 is arranged along the length direction of the RF reeds 31. The RF reeds 31 are located in the corresponding driving grooves 121. The RF reeds 31 are spaced apart from the inner side walls of the corresponding driving grooves 121. The upper end of the micro-coaxial transmission line 2 extends into the corresponding driving grooves 121.

[0055] This design allows the drive slot 121 to constrain the movement of the corresponding RF reed 31. Thus, when the electromagnetic drive mechanism 4 drives the RF reed 31 to move, the drive slot 121 prevents the RF reed 31 from deflecting, thereby preventing contact deviation between the RF reed 31 and the corresponding micro-coaxial transmission line 2. Furthermore, the micro-coaxial transmission line 2 extends into the drive slot 121, ensuring precise alignment between the RF reed 31 and the end face of the micro-coaxial transmission line 2, reducing signal reflection loss.

[0056] Reference Figure 4 and Figure 5 In this embodiment, the RF reed 31 is rectangular, and compensating chamfers 311 are provided at all four corners of the RF reed 31. The design of the compensating chamfers 311 on the RF reed 31 can, on the one hand, eliminate stress concentration at the corners and improve contact stability; on the other hand, the design of the compensating chamfers 311 can smooth the geometric shape of the edge of the RF reed 31, effectively dispersing areas of concentrated electric field intensity, thereby uniformizing the electric field distribution and improving signal transmission quality. Furthermore, the compensating chamfers 311 can also form a gradual transition structure on the RF reed 31, reducing impedance mutations along the signal transmission path and improving signal transmission quality.

[0057] Reference Figure 4In this embodiment, the inner sidewall of the drive slot 121 at one end, away from the center transmission line 21, along its length is arc-shaped. This arc-shaped inner sidewall design of the drive slot 121 provides a smooth impedance transition at the corresponding position of the drive slot 121, reducing signal reflection coefficient and thereby improving signal transmission quality.

[0058] Reference Figure 1 and Figure 2 The RF connection mechanism 3 further includes a plurality of linkage members 32 , which are arranged in one-to-one correspondence with the RF reeds 31 , and the electromagnetic drive mechanism 4 , the corresponding linkage members 32 and the corresponding RF reeds 31 are connected in sequence.

[0059] The provision of the linkage member 32 can establish a connection between the RF reed 31 and the corresponding electromagnetic drive mechanism 4 , ensuring that the electromagnetic drive mechanism 4 can drive the corresponding RF reed 31 .

[0060] Reference Figure 2 and Figure 6 The linkage part 32 includes a connecting column 321, and a plurality of clearance holes 131 are opened on the metal closing plate 13. The clearance holes 131 are arranged in a one-to-one correspondence with the driving grooves 121. The clearance holes 131 are connected with the corresponding driving grooves 121. The connecting column 321 is plugged into the corresponding clearance hole 131, and the connecting column 321 is slidably connected to the inner wall of the corresponding clearance hole 131 along the axial direction of the corresponding clearance hole 131.

[0061] Reference Figure 2 and Figure 6 The linkage member 32 also includes a driving spring 322, which is arranged parallel to and spaced from the metal closing plate 13. The driving spring 322 is located between the metal closing plate 13 and the RF spring 31, and the driving spring 322 and the RF spring 31 are arranged in a one-to-one correspondence.

[0062] Reference Figure 2 and Figure 6 The driving spring piece 322, the connecting column 321 and the RF spring piece 31 are arranged in a one-to-one correspondence, and the clearance hole 131 passes through the corresponding driving spring piece 322 and the corresponding RF spring piece 31 in the vertical direction. The upper end of the connecting column 321 is plugged into the clearance hole 131 on the corresponding driving spring piece 322, and the lower end of the connecting column 321 is snap-fitted into the clearance hole 131 corresponding to the corresponding RF spring piece 31.

[0063] Reference Figure 2 and Figure 6 A mounting spring ring 33 is provided on the upper side of the metal closure plate 13. The mounting spring ring 33 is spaced apart and parallel to the metal closure plate 13 and is detachably connected to the metal closure plate 13. A plurality of driving springs 322 are located within the mounting spring ring 33. The driving springs 322 are connected to corresponding connecting posts 321 at one end along their length and to the mounting spring ring 33 at the other end.

[0064] With the cooperation of the linkage member 32 and the mounting spring ring 33, when the electromagnetic drive mechanism 4 is in operation, the corresponding driving spring 322 is subjected to the electromagnetic force of the electromagnetic drive mechanism 4 and moves toward the metal closing plate 13. This enables the driving spring 322 to drive the corresponding connecting column 321 to move, thereby driving the corresponding RF spring 31. Similarly, when the electromagnetic drive mechanism 4 is powered off, the connection between the corresponding driving spring 322 and the mounting spring ring 33 drives the driving spring 322 to reset under the action of its own elastic force. This enables the driving spring 322 to drive the corresponding connecting column 321 to reset, thereby resetting the RF spring 31.

[0065] Reference Figure 2 and Figure 6 In this embodiment, the clearance hole 131 is a non-circular hole, specifically a square hole. The cross-sectional shape of the connecting post 321 matches the shape of the clearance hole 131. The shape coordination between the connecting post 321 and the clearance hole 131 prevents the connecting post 321 from rotating and deflecting during the driving of the RF reed 31, thereby ensuring the vertical alignment accuracy between the RF reed 31 and the micro-coaxial transmission line 2 and avoiding impedance mismatch caused by alignment deviation.

[0066] Reference Figure 2 and Figure 6 In this embodiment, the shape of the mounting spring ring 33 is a square ring, and the mounting spring ring 33 is connected to the metal closing plate 13 by bolts.

[0067] Reference Figure 1 and Figure 6 A magnetic sheet 323 is provided along the middle of the length of the driving spring piece 322, and the magnetic sheet 323 is fixedly connected to the corresponding driving spring piece 322. The electromagnetic driving mechanism 4 is provided in a one-to-one correspondence with the driving spring piece 322, and the electromagnetic driving mechanism 4 is located above the corresponding driving spring piece 322, and the electromagnetic driving mechanism 4 is arranged directly opposite the corresponding magnetic sheet 323.

[0068] Based on the cooperation between the magnetic sheet 323 and the electromagnetic drive mechanism 4, when the electromagnetic drive mechanism 4 is energized, the magnetic sheet 323 is pushed by the magnetic force of the electromagnetic drive mechanism 4, thereby realizing the driving function of the driving spring 322. On this basis, because the magnetic sheet 323 and the connecting column 321 are spaced apart along the length direction of the corresponding driving spring 322, the electromagnetic force between the electromagnetic drive mechanism 4 and the magnetic sheet 323 will not directly impact the corresponding RF reed 31. This can reduce the impact of the electromagnetic drive mechanism 4 on the RF reed 31, thereby improving the performance of the microwave mechanical switch.

[0069] Reference Figure 1 and Figure 6In this embodiment, the electromagnetic drive mechanism 4 includes a mounting frame 41 and an electromagnetic coil 42. The electromagnetic coil 42 is mounted on the mounting frame 41, with one end of the electromagnetic coil 42 facing the corresponding magnetic plate 323. In this embodiment, the mounting frame 41 can be mounted to the metal sealing plate 13 using bolts and common connectors.

[0070] The implementation principle of the embodiment of the present application is: when using a microwave mechanical switch, the microwave mechanical switch is patched onto the user RF board, and the micro-coaxial transmission line 2 on the microwave mechanical switch is vertically interconnected with the microstrip line on the user RF board, so that a vertical signal transmission path can be established between the microwave mechanical switch and the user RF board.

[0071] When RF signal transmission is required, the corresponding electromagnetic drive mechanism 4 is energized, and under the action of the linkage member 32, the RF reed 31 moves to achieve conduction between the corresponding two micro-coaxial transmission lines 2. Conversely, when RF signal transmission needs to be interrupted, the corresponding electromagnetic drive mechanism 4 is deenergized, and under the action of the linkage member 32, the RF reed 31 automatically resets, thereby interrupting the conduction between the two micro-coaxial transmission lines 2. Based on the control of multiple electromagnetic drive mechanisms 4, RF signal transmission between the microwave mechanical switch and the user's RF board can be achieved.

[0072] Based on the design of the microwave mechanical switch of the present application, the operating frequency of the microwave mechanical switch of the present application can reach above 40 GHz.

[0073] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A SPnT surface mount microwave mechanical switch, characterized in that: include: A metal substrate (1), wherein a plurality of micro-coaxial transmission lines (2) are provided in the metal substrate (1), wherein the length direction of the micro-coaxial transmission lines (2) is arranged along the thickness direction of the metal substrate (1), and both ends of the micro-coaxial transmission lines (2) pass through the metal substrate (1); A radio frequency connection mechanism (3), the radio frequency connection mechanism (3) comprising a plurality of radio frequency reeds (31), one radio frequency reed (31) being provided between two adjacent micro-coaxial transmission lines (2), the radio frequency reeds (31) being arranged parallel to and spaced apart from the metal substrate (1), and a linkage member (32) being provided on the radio frequency reeds (31); An electromagnetic drive mechanism (4), the electromagnetic drive mechanism (4) and the radio frequency reed (31) are arranged in a one-to-one correspondence, the electromagnetic drive mechanism (4) is connected to the corresponding linkage member (32), and the electromagnetic drive mechanism (4) is used to drive the radio frequency reed (31) to overlap with the corresponding two micro-coaxial transmission lines (2).

2. The SPnT surface-mount microwave mechanical switch according to claim 1, characterized in that: A plurality of pads (11) are provided on a side of the metal substrate (1) facing away from the electromagnetic drive mechanism (4), the pads (11) are provided in one-to-one correspondence with the micro-coaxial transmission lines (2), and one end of the micro-coaxial transmission line (2) is connected to the corresponding pad (11).

3. The SPnT surface-mount microwave mechanical switch according to claim 1, characterized in that: A closed cavity (12) is provided on one side of the metal substrate (1), a plurality of radio frequency reeds (31) are located in the closed cavity (12), and one end of the micro-coaxial transmission line (2) extends into the closed cavity (12); A metal closing plate (13) is provided on one side of the metal substrate (1), and the metal closing plate (13) closes the closed cavity (12); The electromagnetic drive mechanism (4) is located on a side of the metal closing plate (13) facing away from the metal base plate (1), and the linkage member (32) passes through the metal closing plate (13).

4. The SPnT surface-mount microwave mechanical switch according to claim 3, characterized in that: A plurality of driving grooves (121) are provided on one side of the metal substrate (1), the plurality of driving grooves (121) form the closed cavity (12), and one end of each of the micro-coaxial transmission lines (2) extends into a corresponding driving groove (121); The driving groove (121) and the radio frequency reed (31) are arranged in a one-to-one correspondence, the length direction of the driving groove (121) is arranged along the length direction of the corresponding radio frequency reed (31), the radio frequency reed (31) is located in the corresponding driving groove (121), and the radio frequency reed (31) is spaced apart from the inner side wall of the corresponding driving groove (121).

5. The SPnT surface-mount microwave mechanical switch according to claim 3, characterized in that: The linkage member (32) includes a connecting column (321) and a driving spring (322), a plurality of clearance holes (131) are formed through the metal closing plate (13), the clearance holes (131) are communicated with the closing cavity (12), the connecting column (321) and the clearance holes (131) are arranged in a one-to-one correspondence, the connecting column (321) and the corresponding clearance holes (131) are slidably plugged into each other, and one end of the connecting column (321) is connected to the corresponding radio frequency spring (31), and the other end is connected to the driving spring (322); The metal closing plate (13) is provided with a mounting spring ring (33), the mounting spring ring (33) and the metal closing plate (13) are arranged in parallel and spaced apart, and the driving spring (322) is connected to the mounting spring ring (33) at one end along its length direction, and is connected to the corresponding connecting column (321) at the other end; A magnetic sheet (323) is provided on the driving elastic sheet (322), and the magnetic sheet (323) is arranged opposite to the corresponding electromagnetic driving mechanism (4).

6. The SPnT surface-mount microwave mechanical switch according to claim 5, characterized in that: The magnetic sheet (323) and the connecting column (321) are spaced apart along the length direction corresponding to the driving elastic sheet (322).

7. The SPnT surface-mount microwave mechanical switch according to claim 5, characterized in that: The clearance hole (131) is a non-circular hole, and the shape of the connecting column (321) is adapted to correspond to the clearance hole (131).

8. The SPnT surface-mount microwave mechanical switch according to claim 1, characterized in that: The plurality of micro-coaxial transmission lines (2) include a central transmission line (21) and an edge transmission line (22), wherein one central transmission line (21) is provided, and a plurality of edge transmission lines (22) are provided, wherein the plurality of edge transmission lines (22) are arranged around the central transmission line (21), and the plurality of edge transmission lines (22) are arranged in a circular ring; The radio frequency reed (31) is arranged in a one-to-one correspondence with the edge transmission line (22), the radio frequency reed (31) is located between the central transmission line (21) and the corresponding edge transmission line (22), and the radio frequency reed (31) is used to overlap the central transmission line (21) and the corresponding edge transmission line (22).

9. The SPnT surface-mount microwave mechanical switch according to claim 8, characterized in that: Compensating chamfers (311) are provided at the corners of the radio frequency reed (31).

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