Switching structure and method for eliminating echo space reflection of radio frequency signal transmission port

Abstract

The invention relates to the technical field of millimeter wave transmission structures, in particular to a switching structure and method for eliminating echo space reflection of a radio frequency signal transmission port, the structure comprises a product cavity, a switching plane is formed on the product cavity, a connecting structure used for being matched with a switching waveguide is formed on the switching plane, and the connecting structure comprises an embedding hole and a frame plate. A sinking cavity formed between the top of the frame plate and the transfer plane is filled with a filling structure and forms a flat butt joint surface; a transmission channel is formed on the filling structure and is communicated with the communication channel of the frame plate; a switching cavity and a signal transmission hole corresponding to the filling structure are formed in the switching waveguide. In order to solve the problem that product cavity processing is out of control in the batch production process after millimeter wave products are designed and shaped, the sinking cavity is filled and leveled up through the filling structure, and the problems that in the millimeter wave product production process, the receiver noise coefficient is large, the receiving sensitivity is low, the transmitter output power is insufficient, and the in-band power flatness is poor are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of millimeter-wave transmission structures, and particularly to an adapter structure and method for eliminating echo space reflection at a radio frequency signal transmission port. Background Art

[0002] Among the two major products of millimeter-wave product receivers and transmitters, indicators such as the receiver noise figure, receiving sensitivity, transmitter output power, and in-band power flatness are key indicators for reception and transmission. The radio frequency signals for reception and transmission usually use waveguide ports for input and output conversion at the transmission input and output ports, and are connected to an antenna through an adapter waveguide for the transmission and reception of radio frequency signals. The waveguide output port of a millimeter-wave product is a through-hole that communicates inside and outside the cavity. When processing the product cavity, the overall airtightness problem must be considered. It is necessary to ensure good product airtightness, and at the same time ensure that the output signal of the product itself can be transmitted to the next-level device, such as an antenna, a power adder, etc., without loss and matching. At the same time, the radio frequency signal transmitted from the antenna or power adder to the millimeter-wave product also requires no loss and matching, so that the product performance can be brought into the best state.

[0003] Since the product cavity needs to be processed with an opening for embedding the metal frame plate of the airtight glass window at the radio frequency output port, when welding or bonding during the embedding of the metal frame plate of the glass window at the opening, it is very difficult to keep it flush with the radio frequency output waveguide adapter connection surface of the product. Usually, there will be uneven spatial gaps with different depths. When the adapter waveguide flange is connected to the radio frequency output waveguide adapter connection surface of the product, when a radio frequency signal passes through the uneven spatial gaps with different depths, it will inevitably cause echo space reflection. For the received signal, it will directly affect the receiving sensitivity and signal noise of the receiver, and for the transmitted signal, it will directly affect the transmission power loss and in-band power flatness of the transmitter.

[0004] For problems in the production process where the processing of the product cavity is out of control and affects the receiver and transmitter, only through design circuit improvement and optimization, screening of component parameters, and rejection of performance, none of these can solve the problem. In the lightest case, it will affect the judgment of the product technical state, and in the most serious case, it will lead to product scrapping. When such problems occur, if a new product is put into production again, from machining to component procurement to assembly and other series of installation and adjustment and various tests are completed, it increases various cumbersome processes and prolongs the development cycle, undoubtedly delaying the production and delivery schedule, and at the same time increasing the production and manufacturing costs of the enterprise.

[0005] It can be seen that the current waveguide transmission switching scheme still has room for improvement. It should be optimized to improve the reliability of the switching matching structure and reduce the attenuation loss during signal transmission. In particular, when the echo space structure appears during the waveguide transmission process, the echo space structure should be adjusted to eliminate the impact on signal transmission. Therefore, it is necessary to propose a more reasonable technical solution to solve the technical problems existing in the existing technology. Summary of the invention

[0006] In order to overcome at least one of the defects mentioned above, the present invention proposes a switching structure and method for eliminating the spatial reflection of the echo of the radio frequency signal transmission port. The structure of the frame plate set at the product cavity is adjusted to eliminate the sinking cavity at the frame plate and the switching plane, thereby improving the stability and reliability of signal transmission after connection with the switching waveguide and reducing the signal loss during the transmission process.

[0007] In order to achieve the above purpose, the switching structure disclosed in the present invention can adopt the following technical solutions:

[0008] A transfer structure for eliminating echo spatial reflections of a radio frequency signal transmission port includes a product cavity, a transfer plane is formed on the product cavity, a connection structure for cooperating with a transfer waveguide is formed on the transfer plane, the connection structure includes an embedding hole and a frame plate arranged on the embedding hole, a sunken cavity formed between the top of the frame plate and the transfer plane is filled with a filling structure to form a flat docking surface; a transmission channel is formed on the filling structure and is docked and connected with the communication channel of the frame plate; a transfer cavity and a signal transmission hole corresponding to the filling structure are formed on the transfer waveguide, and the signal transmission hole is docked and connected with the transmission channel and the communication channel.

[0009] The above disclosed transfer structure maintains the flushness of the frame plate and the transfer plane through the connection structure, which can maintain the connection stability between the product cavity and the transfer waveguide, avoid echo space reflection during transmission, reduce signal loss during transmission, and ensure stable and reliable signal transmission.

[0010] Furthermore, the connection structure is mainly used to set the frame plate to help maintain the stable posture of the frame plate transmitting signals, thereby improving the connection precision with the waveguide transfer and maintaining the stability of signal transmission. The frame plate is set at the transfer plane to maintain the precision and reliability of the transmission structure, and there is no echo space. Its structure is not limited to a single one. Here, it is optimized and one of the feasible options is proposed: an airtight medium is set in the communication channel of the frame plate, and the airtight medium is flush with the two ports of the communication channel. When the above scheme is adopted, the airtight medium is used to seal and isolate the communication channel, and while achieving stable signal transmission, it prevents external impurities from entering the communication channel.

[0011] Furthermore, the hermetic medium can be composed of various substances to form the seal of the communication channel, enabling signal transmission while preventing the entry of external impurities. Its selection is not uniquely limited. Here, one feasible option is optimized and proposed: the hermetic medium includes hermetic glass. When the above solution is adopted, the entire communication channel of the frame plate is filled and sealed with hermetic glass. When the signal is transmitted into the communication channel, it propagates in a uniform medium, and the consistency of its propagation direction is well maintained.

[0012] Furthermore, the filling structure can adopt various solutions. It can be a cured structure or filled with multiple components. Here, one feasible option is proposed: the filling structure includes a cured metal filler, and a flat metal foil covers the top of the metal filler. The transmission channel is formed within the metal filler, and metal foil transmission through-holes corresponding to the transmission channel are formed on the metal foil. When the above solution is adopted, the metal foil is a flat foil, which covers the surface of the metal filler, fits with the metal filler, and is connected and cooperates with the transition waveguide, which can ensure the precision of the mating structure at the transition and ensure the stable and reliable signal transmission.

[0013] Furthermore, in some other solutions, the filling structure can be configured in other forms. Here, one feasible option is proposed: the filling structure includes several stacked metal foils, and metal foil transmission through-holes are formed on the metal foils to form the transmission channel. When the above solution is adopted, the metal foils are stacked layer by layer to fill the sinking cavity gap and keep the frame plate in the embedding hole. After the metal foils are stacked, an integral filling structure is formed, which can be flush with the conversion plane. After connecting the conversion waveguide, the precision of the mating structure at the transition can also be ensured, and the stable and reliable signal transmission can be ensured.

[0014] Furthermore, the structural setting method of the transition waveguide can adopt various solutions, and its structure is not uniquely limited. Here, one feasible option is optimized and proposed: the transition waveguide is fitted on the transition plane, and the transition cavity corresponds and cooperates with the filling structure to enable the signal to be transmitted in the signal transmission through-hole, transmission channel, and communication channel. When the above solution is adopted, the transition waveguide is connected to the product cavity, which can better transmit the signal.

[0015] Furthermore, the transition waveguide can adopt various design solutions, and its structure is not uniquely limited. Here, one feasible option is optimized and proposed: the transition waveguide includes a connecting flange, and several flange connection holes are formed on the connecting flange; several transition connection holes corresponding to the flange connection holes are formed on the transition plane, and the connecting flange is connected to the transition plane through fasteners. When the above solution is adopted, the flange connection holes are aligned with the transition connection holes and fixed by fasteners.

[0016] The above discloses a specific composition scheme of the switching structure, and the present invention also discloses a specific method of the switching structure.

[0017] The method for eliminating the echo space reflection of the radio frequency signal transmission port comprises:

[0018] Set up the product cavity and place the frame plate on the transfer plane;

[0019] A filling structure is arranged in the sinking cavity formed by the top of the frame plate and the transfer plane, the filling structure fills the sinking cavity and forms an integrated structure with the product cavity, and the top surface of the filling structure is flush with the transfer plane;

[0020] A transfer waveguide is arranged and fixed to the transfer plane, and the transfer cavity and the signal transmission hole of the transfer waveguide are aligned with the filling structure.

[0021] Furthermore, there are many options for setting the filling structure. Here, we optimize and propose one feasible option: setting the filling structure in the sinking cavity formed by the frame plate and the transfer plane, including pouring metal slurry into the sinking cavity and solidifying it into a metal filler, and attaching a metal foil to the top of the metal filler so that the metal foil is flush with the transfer plane. When adopting the above solution, silver paste or tin paste can be used as the metal filler and solidified.

[0022] Furthermore, other solutions can be used to set the filling structure. Here, we optimize and propose one feasible option: a filling structure is set in the gap formed by the frame plate and the sinking cavity, including sequentially stacking metal foils in the sinking cavity so that the metal foils are flush with the transfer plane. When the above solution is adopted, the metal foils are in sheet form and fit each other when stacked.

[0023] Compared with the prior art, some beneficial effects of the technical solution disclosed in the present invention include:

[0024] In view of the situation that the product cavity processing is out of control during the mass production process after the millimeter wave product design is finalized, the present invention solves the problem of uncontrolled product cavity processing through a filling structure. By filling the sinking cavity, the problems of large receiver noise coefficient and low receiving sensitivity in the millimeter wave product production process are specifically solved. At the same time, the problems of insufficient transmitter output power and poor in-band power flatness in the millimeter wave product production process are also specifically solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic diagram of the overall composition of a switching structure for eliminating echo space reflections at a radio frequency signal transmission port.

[0027] Figure 2 It is a schematic diagram of a sinking cavity formed by excessive sinking of the product transfer plane embedded in the frame plate.

[0028] Figure 3 It is a schematic diagram of the product transfer plane to be embedded in the frame plate.

[0029] Figure 4 This is a schematic diagram of the waveguide flange for signal transmission adapter at the RF output port.

[0030] Figure 5 It is a schematic diagram of a frame plate for embedding a gas-tight medium.

[0031] Figure 6 It is a schematic cross-sectional view of the entire transfer structure.

[0032] Figure 7 Schematic cross-sectional view of a switching structure for eliminating spatial reflection of echoes at a radio frequency signal transmission port (the filling structure uses metal fillers and metal foil).

[0033] Figure 8 Schematic cross-sectional view of a switching structure for eliminating spatial reflection of echoes at a radio frequency signal transmission port (the filling structure is made of metal foil).

[0034] In the above figure, the meaning of each mark is:

[0035] 1. Transfer plane; 2. Product cavity; 3. Gap; 4. Metal filler; 5. Metal foil; 6. Metal foil transmission through hole; 7. Transfer connection hole; 8. Airtight medium; 9. Frame plate; 10. Sinking cavity; 11. Embedded hole; 12. Connection flange; 13. Transfer cavity; 14. Signal transmission hole; 15. Flange connection hole. DETAILED DESCRIPTION

[0036] The present embodiment is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0037] In view of the shortcomings of the existing millimeter wave RF signal in the waveguide switching transmission process, the following embodiments are optimized and overcome the defects in the prior art.

[0038] Example 1

[0039] like Figures 1 to 8As shown, a transfer structure for eliminating the spatial reflection of the echo of the radio frequency signal transmission port includes a product cavity 2, a transfer plane 1 is formed on the product cavity 2, a connection structure for cooperating with a transfer waveguide is formed on the transfer plane 1, the connection structure includes an embedding hole 11 and a frame plate 9 arranged on the embedding hole 11, a sinking cavity 10 formed between the top of the frame plate 9 and the transfer plane 1 is filled with a filling structure to form a flat docking surface; a transmission channel is formed on the filling structure and is docked and connected with the communication channel of the frame plate 9; a transfer cavity 13 and a signal transmission hole 14 corresponding to the filling structure are formed on the transfer waveguide, and the signal transmission hole 14 is docked and connected with the transmission channel and the communication channel.

[0040] Preferably, the frame plate 9 used in this embodiment is made of metal material. After the frame plate 9 is installed in the embedding hole 11, the gap 3 generated at the edge position is also filled by the filling structure.

[0041] The transfer structure disclosed in this embodiment maintains the flushness of the frame plate 9 and the transfer plane 1 through the connection structure, which can maintain the connection stability between the product cavity 2 and the transfer waveguide, avoid echo space reflection during transmission, reduce signal loss during transmission, and ensure stable and reliable signal transmission.

[0042] The connection structure is mainly used to set the frame plate 9, which helps to maintain the stable posture of the frame plate 9 transmitting signals, thereby improving the connection precision with the waveguide transfer and maintaining the stability of signal transmission. The frame plate 9 is set at the transfer plane 1 to maintain the precision and reliability of the transmission structure, and there is no echo space. Its structure is not limited to the only one. This embodiment is optimized and adopts one of the feasible options: an airtight medium 8 is set in the communication channel of the frame plate 9, and the airtight medium 8 is flush with the two ports of the communication channel. When the above scheme is adopted, the airtight medium 8 is used to seal and isolate the communication channel, and prevent external impurities from entering the communication channel while realizing stable signal transmission.

[0043] The airtight medium 8 can be made of a variety of materials to form a seal of the communication channel, realize signal transmission and prevent the entry of external impurities. The selection is not limited to a single one. This embodiment optimizes and adopts one of the feasible options: the airtight medium 8 includes airtight glass. When the above solution is adopted, the communication channel of the frame plate 9 is filled with airtight glass for sealing. When the signal is transmitted into the communication channel, it propagates in a uniform medium, and the consistency of its propagation direction is maintained well.

[0044] The filling structure can adopt various solutions. It can be a cured and formed structure or multiple components can be used for filling. In this embodiment, a feasible option is adopted: the filling structure includes a cured and formed metal filler 4, and a flat metal foil 5 covers the top of the metal filler 4. The transmission channel is formed within the metal filler 4, and metal foil transmission through-holes 6 corresponding to and communicating with the transmission channel are formed on the metal foil 5. When adopting the above solution, the metal foil 5 is a flat foil, which covers the surface layer of the metal filler 4, fits with the metal filler 4, and is connected and cooperates with the transition waveguide, which can ensure the precision of the mating structure at the transition and the stable and reliable signal transmission.

[0045] In some other solutions, the filling structure can be constructed in other forms. In this embodiment, a feasible option is adopted: the filling structure includes several stacked metal foils 5, and metal foil transmission through-holes 6 are formed on the metal foils 5 to form a transmission channel. When adopting the above solution, the metal foils 5 are stacked layer by layer, filling the gap 3 of the sinking cavity 10 and keeping the frame plate within the embedding hole 11. After the metal foils 5 are stacked, an integral filling structure is formed, which can be kept flush with the conversion plane. After connecting the conversion waveguide, it can also ensure the precision of the mating structure at the transition and the stable and reliable signal transmission.

[0046] The structural setting method of the transition waveguide can adopt various solutions, and its structure is not uniquely limited. In this embodiment, it is optimized and a feasible option is adopted: the transition waveguide is fitted and arranged on the transition plane 1, and the transition cavity 13 corresponds and cooperates with the filling structure to realize the transmission of signals within the signal transmission through-holes, transmission channels, and communication channels. When adopting the above solution, the transition waveguide is connected to the product cavity 2, which can better transmit signals.

[0047] The transition waveguide can adopt various design solutions, and its structure is not uniquely limited. In this embodiment, it is optimized and a feasible option is adopted: the transition waveguide includes a connecting flange 12, and several flange connection holes 15 are formed on the connecting flange 12; several transition connection holes 7 are formed on the transition plane 1 corresponding to the connection holes 15 of the connecting flange 12, and the connecting flange 12 is connected to the transition plane 1 through fasteners. When adopting the above solution, the flange connection holes 15 are aligned with the transition connection holes 7 and fixed through fasteners.

[0048] Embodiment 2

[0049] The above embodiment discloses the specific composition solution of the transition structure, and the present invention also discloses a specific method.

[0050] A method for eliminating the echo space reflection at the radio frequency signal transmission port includes:

[0051] Set up the product cavity 2 and place the frame plate 9 on the transition plane 1;

[0052] A filling structure is arranged in the sunken cavity 10 formed between the top of the frame plate 9 and the transfer plane 1. The filling structure fills the sunken cavity 10 and forms an integral structure with the product cavity 2. The top surface of the filling structure is flush with the transfer plane 1.

[0053] A transfer waveguide is arranged and fixedly fitted to the transfer plane 1. The transfer cavity 13 and the signal transmission holes 14 of the transfer waveguide are aligned and fitted with the filling structure.

[0054] There are multiple solutions for arranging the filling structure. In this embodiment, optimization is carried out and one feasible option is adopted: a filling structure is arranged in the sunken cavity 10 formed between the frame plate 9 and the transfer plane 1, including pouring metal paste into the sunken cavity 10 and curing it into a metal filler, and attaching a metal foil 5 to the top of the metal filler so that the metal foil 5 is flush with the transfer plane 1. When adopting the above solution, silver paste or tin paste can be used as the metal filler and formed and cured.

[0055] There are also other solutions for arranging the filling structure. In this embodiment, optimization is carried out and one feasible option is adopted: a filling structure is arranged in the gap 3 formed between the frame plate 9 and the sunken cavity 10, including stacking metal foils 5 in sequence in the sunken cavity 10 so that the metal foils 5 are flush with the transfer plane 1. When adopting the above solution, the metal foils 5 are in sheet form and are attached to each other during stacking.

[0056] The above are the implementation manners listed in this embodiment, but this embodiment is not limited to the above optional implementation manners. Those skilled in the art can obtain many other implementation manners by arbitrarily combining the above manners. Anyone can obtain various other forms of implementation manners under the inspiration of this embodiment. The above specific implementation manners should not be construed as limiting the protection scope of this embodiment. The protection scope of this embodiment shall be defined by the claims.

Claims

1. A switching structure for eliminating echo space reflection at a radio frequency signal transmission port, characterized in that: It includes a product cavity (2), a transition plane (1) is formed on the product cavity (2), and a connection structure for mating with a transition waveguide is formed on the transition plane (1). The connection structure includes an embedding hole (11) and a frame plate (9) disposed in the embedding hole (11). A sunken cavity (10) formed between the top of the frame plate (9) and the transition plane (1) is filled with a filling structure to form a flat docking surface. A transmission channel is formed on the filling structure and is docked and communicated with the communication channel of the frame plate (9); a transition cavity (13) and a signal transmission hole (14) corresponding to the filling structure are formed on the transition waveguide, and the signal transmission hole (14) is docked and communicated with the transmission channel and the communication channel.

2. The adapter structure for eliminating the spatial reflection of the echo of the radio frequency signal transmission port according to claim 1, characterized in that: An airtight medium (8) is disposed in the communication channel of the frame plate (9), and the airtight medium (8) is flush with the two ports of the communication channel.

3. The adapter structure for eliminating the spatial reflection of the echo of the radio frequency signal transmission port according to claim 2, characterized in that: The airtight medium (8) includes airtight glass.

4. The adapter structure for eliminating the spatial reflection of the echo of the radio frequency signal transmission port according to claim 1 or 2, characterized in that: The filling structure includes a metal filling material (4) formed by curing. A flat metal foil (5) covers the top of the metal filling material (4). The transmission channel is formed in the metal filling material (4), and a metal foil transmission through hole (6) corresponding to and communicated with the transmission channel is formed on the metal foil (5).

5. The adapter structure for eliminating the spatial reflection of the echo of the radio frequency signal transmission port according to claim 1 or 2, characterized in that: The filling structure includes a plurality of stacked metal foils (5). Metal foil transmission through holes (6) are formed on the metal foils (5) to form a transmission channel.

6. The adapter structure for eliminating the spatial reflection of the echo of the radio frequency signal transmission port according to claim 1, wherein: The transition waveguide is attached to the transition plane (1), and the transition cavity (13) is correspondingly mated with the filling structure to realize signal transmission in the signal transmission through hole, the transmission channel, and the communication channel.

7. The adapter structure for eliminating the spatial reflection of the echo of the radio frequency signal transmission port according to claim 1 or 6, characterized in that: The transition waveguide includes a connection flange (12), and a plurality of flange connection holes (15) are formed on the connection flange (12); a plurality of transition connection holes (7) are formed on the transition plane (1) corresponding to the connection holes (15) of the connection flange (12), and the connection flange (12) is connected to the transition plane (1) through fasteners.

8. Method for eliminating spatial reflection of echo at radio frequency signal transmission port, characterized in that, It includes: Set the product cavity (2) and set the frame plate (9) on the transition plane (1); Set a filling structure in the sunken cavity (10) formed between the top of the frame plate (9) and the transition plane (1). The filling structure fills the sunken cavity (10) and forms an integral structure with the product cavity (2). The top surface of the filling structure is flush with the transition plane (1); Set the transition waveguide, fix the transition waveguide to the transition plane (1) in a mating manner, and the transition cavity (13) and the signal transmission hole (14) of the transition waveguide are aligned and mated with the filling structure.

9. The method for eliminating the spatial reflection of the echo of the radio frequency signal transmission port according to claim 8, wherein: Set a filling structure in the sunken cavity (10) formed between the frame plate (9) and the transition plane (1), including pouring metal slurry into the sunken cavity (10) and curing it into a metal filler, and attaching a metal foil (5) to the top of the metal filler to keep the metal foil (5) flush with the transition plane (1).

10. The method for eliminating the spatial reflection of the echo of the radio frequency signal transmission port according to claim 8, characterized in that: Set a filling structure in the gap (3) formed between the frame plate (9) and the sunken cavity (10), including sequentially stacking metal foils (5) in the sunken cavity (10) to keep the metal foils (5) flush with the transition plane (1).

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