Millimeter wave magnetic coupling variable resonance equalizer

Abstract

The invention belongs to the technical field of electronic information, and discloses a millimeter wave magnetic coupling variable resonant equalizer, which comprises a transmission waveguide channel, a coupling channel and a resonant cavity which are communicated, the resonant cavity and the coupling channel are arranged in the narrow side direction of the transmission waveguide channel, the opening direction of the coupling channel is parallel to the direction component of an electric field, and the opening direction of the coupling channel is parallel to the direction component of the electric field. The inner walls of the two ends of the resonant cavity are adjustably and slidably connected with adjusting blocks, the opposite inner side faces of the two adjusting blocks are fixedly connected with wave absorbing materials, and the inner wall, facing the coupling channel, of the resonant cavity is detachably and movably connected with a guide block. The center position of the resonant cavity is provided with a telescopic tuning pin perpendicular to the direction component of the magnetic field. According to the structure, the processing and installation problems of a common waveguide equalizer are effectively solved, the equalizer is debugged more simply and quickly, meanwhile, the standing-wave ratio is optimized by changing the cavity structure, and a relatively complex gain curve can be equalized through the good frequency response characteristic.

Description

Technical Field

[0001] The present application relates to the field of electronic information technology, and more specifically, to a millimeter-wave magnetic coupling variable resonance equalizer. Background Art

[0002] Since most of the power amplifier chips currently used in power amplifier modules such as microwave and millimeter-wave have difficulty directly achieving the flatness of the gain curve in the corresponding bandwidth, and amplitude distortion will occur during transmission, equalizers are often used as a countermeasure for adjustment. Currently, equalizers can be divided into microstrip equalizers, coaxial equalizers, and waveguide equalizers according to the transmission method. Waveguide equalizers usually connect resonant cavities through coupling holes to achieve power equalization. Compared with the other two types of equalizers, waveguide equalizers have a larger power capacity and lower processing difficulty.

[0003] Using traditional waveguide equalizers for power equalization inevitably brings the following problems: 1. Processing and assembly problems: Ordinary waveguide equalizers usually place a circuit substrate with a thin-film resistor in the resonant cavity to consume energy, suppress energy reflection, and thus optimize the standing wave. However, the processing cost of the substrate using thin-film resistors is not low, and to fix the substrate in the center of the cavity to enhance its absorption capacity increases the processing difficulty and assembly difficulty. Using ordinary absorbing materials for consumption also faces the assembly problem of how to accurately install the absorbing materials at the required positions.

[0004] 2. Debugging problems: Ordinary waveguide equalizers use a thin-film resistor substrate fixed in the center of the cavity. During the debugging process, replacing the thin-film resistor that mainly affects the performance requires reassembling a new substrate with thin-film resistors of other resistance values, which greatly increases the debugging difficulty and it is also difficult to change the position of the substrate for debugging; if ordinary absorbing materials are used, debugging is carried out by changing the size, shape, and position of the absorbing materials, and normal manual cutting and moving of the absorbing materials are difficult to meet the accuracy requirements.

[0005] 3. Standing wave problems: Ordinary waveguide equalizers usually have a poor standing wave ratio, which will cause the standing wave and other indicators of the entire link to be affected, resulting in a reduction in overall performance.

[0006] 4. Frequency response resolution problems: Ordinary waveguide equalizers have a poor frequency response resolution, that is, it is difficult to successfully equalize a relatively complex gain curve in a wideband range to ensure that the flatness reaches the required indicators. Summary of the Invention

[0007] In order to solve the above problems, the present application provides a millimeter-wave magnetic coupling variable resonance equalizer.

[0008] A millimeter-wave magnetic coupling variable resonance equalizer provided by this application adopts the following technical solution: A millimeter-wave magnetic coupling variable resonance equalizer includes a connected transmission waveguide channel, a coupling channel, and a resonance cavity. The resonance cavity and the coupling channel are arranged in the narrow side direction of the transmission waveguide channel. The opening direction of the coupling channel is parallel to the electric field direction component. Adjusting blocks are slidably connected to the inner walls at both ends of the resonance cavity in an adjustable manner. Absorbing materials are fixedly connected to the inner sides of the two adjusting blocks facing each other. A guiding block is detachably and movably connected to the inner wall of the resonance cavity facing the coupling channel. A telescopic tuning pin is arranged at the center position of the resonance cavity perpendicular to the magnetic field direction component.

[0009] Further, the resonance cavity includes a housing and a cover plate. The cover plate and the housing are detachably and hermetically connected through a flange plate. A limiting clamping block is arranged on the inner wall of the cover plate. An installation sliding groove matching the limiting clamping block is opened on the surface of the guiding block facing it.

[0010] Through the above technical solution, it is convenient to replace guiding blocks with different sizes and angles.

[0011] Further, the outer end of the guiding block is in an inverted triangular shape, and its tip corresponds to the center position of the coupling channel.

[0012] Through the above technical solution, the impedance of the resonance cavity is reduced, so that electromagnetic waves propagate in the direction of both ends of the resonance cavity, thereby increasing the absorption of the energy coupled into the resonance cavity by the absorbing material.

[0013] Further, the four sides of the adjusting block are attached to the inner wall of the resonance cavity. Adjusting rods are threadedly connected to both ends of the resonance cavity. The inner ends of the adjusting rods are rotationally and fixedly connected to the outer sides of the adjusting blocks. First adjusting knobs are fixedly connected to the outer ends of the adjusting rods.

[0014] Through the above technical solution, by rotating the first adjusting knob and the adjusting rod, the distance between the two adjusting blocks in the resonance cavity can be adjusted, and thus the internal length of the resonance cavity can be adjusted.

[0015] Further, the tuning pin is connected to a side wall of the resonance cavity through a fine thread. A second adjusting knob is fixedly connected to the outer end of the tuning pin.

[0016] Through the above technical solution, by rotating the second adjusting knob, the length of the tuning pin extending into the resonance cavity can be controlled, and thus the performance of the entire equalization unit can be finely adjusted.

[0017] Further, a plurality of coupling channels and resonance cavities are equidistantly distributed on both sides of the narrow side of a single transmission waveguide channel.

[0018] Through the above technical solution, the gain curve is analyzed, so as to design equalization units corresponding to each uneven point of the curve. Then, all the equalization units are cascaded and simulated. According to the difference between the obtained cascaded simulation curve and the target curve, the variables mentioned above are finely adjusted, and the required equalizer can be obtained. The equalizer obtained in this way has good frequency response characteristics compared with the conventional waveguide equalizer, and the target can have better flatness after equalization.

[0019] In summary, the present application includes at least the following beneficial technical effects: The structure of the present invention not only effectively solves the processing and installation problems of the conventional waveguide equalizer, but also makes the debugging of the equalizer simpler and faster. At the same time, the standing wave ratio is optimized through the changed cavity structure, and the good frequency response characteristics can equalize relatively complex gain curves. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the simulation single cavity structure of the present application; Figure 2 It is a schematic diagram of the waveguide transmission direction; Figure 3 It is a schematic diagram of the propagation direction of electromagnetic waves after coupling into the resonant cavity; Figure 4 It is a schematic diagram of the overall simulation of multi-stage parallel connection; Figure 5 It is a diagram of the overall simulation result of the equalizer.

[0021] Explanation of the reference numerals in the drawings: 1. Transmission waveguide channel; 2. Coupling channel; 3. Resonant cavity; 31. Housing; 32. Cover plate; 33. Limit block; 4. Adjusting block; 41. Adjusting rod; 42. First adjusting knob; 5. Absorbing material; 6. Guide block; 7. Tuning pin; 71. Second adjusting knob. Detailed Embodiments

[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0023] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. Embodiment

[0025] The present application will be further described in detail below with reference to the drawings.

[0026] An embodiment of the present application discloses a millimeter-wave magnetic coupling variable resonance equalizer, which includes a connected transmission waveguide channel 1, a coupling channel 2, and a resonance cavity 3. The resonance cavity 3 and the coupling channel 2 are arranged in the narrow side direction of the transmission waveguide channel 1. The opening direction of the coupling channel 2 is parallel to the electric field direction component. Adjusting blocks 4 are slidably connected to the inner walls at both ends of the resonance cavity 3 in an adjustable manner. Absorbing materials 5 are fixedly connected to the opposite inner sides of the two adjusting blocks 4. A guiding block 6 is detachably and movably connected to the inner wall of the resonance cavity 3 facing the coupling channel 2. A telescopic tuning pin 7 is arranged at the central position of the resonance cavity 3 perpendicular to the magnetic field direction component.

[0027] Preferably, the resonance cavity 3 includes a housing 31 and a cover plate 32. The cover plate 32 is detachably and hermetically connected to the housing 31 through a flange plate. A limiting block 33 is arranged on the inner wall of the cover plate 32. An installation chute matching the limiting block 33 is opened on the opposite side of the guiding block 6. This is convenient for replacing guiding blocks 6 with different sizes and angles.

[0028] Preferably, the outer end of the guiding block 6 is in an inverted triangular shape, and its tip corresponds to the central position of the coupling channel 2. To reduce the impedance of the resonance cavity 3, so that the electromagnetic wave propagates in the direction of both ends of the resonance cavity 3, thereby increasing the absorption of the energy coupled into the resonance cavity 3 by the absorbing material 5.

[0029] Preferably, the four sides of the adjustment block 4 are in contact with the inner wall of the resonant cavity 3. Both ends of the resonant cavity 3 are threadedly connected with adjustment rods 41. The inner ends of the adjustment rods 41 are rotationally and fixedly connected to the outer sides of the adjustment block 4. The outer ends of the adjustment rods 41 are fixedly connected with first adjustment knobs 42. By rotating the first adjustment knobs 42 and the adjustment rods 41, the distance between the two adjustment blocks 4 in the resonant cavity 3 can be adjusted, thereby realizing the adjustment of the internal length of the resonant cavity 3.

[0030] Preferably, the adjustment pin is connected to one side wall of the resonant cavity 3 through a fine thread, and the outer end of the adjustment pin is fixedly connected with a second adjustment knob 71. By rotating the second adjustment knob 71, the length of the adjustment pin extending into the resonant cavity 3 can be controlled, thereby finely adjusting the performance of the entire equalization unit.

[0031] Preferably, a plurality of coupling channels 2 and resonant cavities 3 are equally spaced on both sides of the narrow side of a single transmission waveguide channel 1. By analyzing the gain curve, equalization units corresponding to each unevenness of the curve are designed, and then all the equalization units are cascaded and simulated. According to the difference between the obtained cascaded simulation curve and the target curve, the variables mentioned above are finely adjusted, and the required equalizer can be obtained. The equalizer obtained in this way has better frequency response characteristics compared with the usual waveguide equalizer, and the target can have better flatness after equalization.

[0032] The implementation principle of a millimeter-wave magnetic coupling variable resonant equalizer in an embodiment of the present application is as follows: According to the Bethe hole coupling theory, the holes in the narrow side direction of the waveguide are located at the X = 0 position, and there is only a magnetic pole coupling component. The waveguide equalizer design in this embodiment uses coupling in the narrow side direction, that is, as Figure 2 shown, a is the wide side, b is the narrow side, the electric field direction component is along the narrow side direction, and the magnetic field direction component is along the long side direction. When the electromagnetic wave propagates in the waveguide transmission direction, it is coupled into the resonant cavity through the coupling holes. Since the electric field direction component is parallel to the opening direction of the holes, only the magnetic field direction component is coupled into the resonant cavity by the coupling holes.

[0033] After the electromagnetic wave is coupled into the resonant cavity, let the components of the wave propagating towards both ends of the resonant cavity be a1 and b1 respectively. Under ideal conditions, its propagation in the resonant cavity follows the following relationship

[0034] where Mz is the waveguide transmission direction component of the magnetic field. It can be seen that after the electromagnetic wave is coupled into the resonant cavity, the propagation direction is roughly as Figure 3 shown.

[0035] From Figure 3It is known that after electromagnetic waves are coupled into the resonant cavity, they spread diffusively towards both ends of the cavity. Compared with the usual waveguide equalizer that places a thin-film resistor substrate or an absorbing material at the center of the cavity, the present invention places the absorbing material at both ends of the resonant cavity, adds a telescopic tuning pin inside the cavity, and changes the top of the center of the resonant cavity to an inverted triangular shape, so as to reduce the impedance of the resonant cavity, making the electromagnetic waves propagate towards both ends a1 and b1 of the resonant cavity, thereby increasing the absorption of the absorbing material for the energy coupled into the resonant cavity.

[0036] In addition, the frequency and absorption amount of the equalization unit are jointly determined by the size of the coupling hole and the size of the inverted triangle at the top of the center of the resonant cavity. By changing the length and width dimensions of the coupling hole of the coupling channel, the size of the guiding block at the top center of the resonant cavity, and the length of the resonant cavity, the frequency and absorption amount of the equalization unit can be changed. Among them, the coupling hole mainly affects the frequency of the equalization unit, and the guiding block at the top of the resonant cavity and the length of the resonant cavity mainly affect the absorption of the equalization unit. By adjusting the above-mentioned various dimensions, the required equalization unit can be obtained.

[0037] Although the assembly error has been reduced by fixing the shape, size, and position of the absorbing material, the machining tolerance of the cavity itself and the difficulty of manual installation during the installation process make it difficult to achieve the theoretical accuracy, so there will still be differences such as frequency deviation between the actual object and the simulation results. For this reason, tuning screws are added, and the performance of the entire equalization unit is finely adjusted by controlling the depth of the tuning screws extending into the cavity. Moreover, this method is more concise and convenient compared with the method of opening the cover to adjust the position of the thin-film resistor substrate or opening the cover to change the position and size of the absorbing material during the debugging of the usual waveguide equalizer, greatly reducing the time consumed during the debugging process.

[0038] In order to obtain an equalizer that can successfully equalize complex curves, it is also necessary to analyze the gain curve, thereby designing an equalization unit for each uneven part of the corresponding curve, and then cascading and simulating all the equalization units. According to the difference between the obtained cascaded simulation curve and the target curve, the variables mentioned above are finely adjusted to obtain the required equalizer. The equalizer obtained in this way has good frequency response characteristics compared with the usual waveguide equalizer, and the target can have better flatness after equalization.

[0039] The power equalizer structure proposed in this application has been verified in simulation software, and the simulation results are as Figure 5 shown. From the simulation result diagram, it can be seen that the standing wave of the equalizer designed this time is good, and the frequency response characteristics are excellent in the broadband range, and it can equalize relatively complex gain curves.

[0040] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A millimeter-wave magnetic coupling variable resonance equalizer, comprising a transmission waveguide channel (1), a coupling channel (2) and a resonance cavity (3) that are connected and communicated, characterized in that, The resonant cavity (3) and the coupling channel (2) are arranged in the narrow-side direction of the transmission waveguide channel (1). The opening direction of the coupling channel (1) is parallel to the component of the electric field direction. The inner walls at both ends of the resonant cavity (3) are slidably connected with adjustable adjusting blocks (4). Absorbing materials (5) are fixedly connected to the opposite inner sides of the two adjusting blocks (4). A guiding block (6) is detachably and movably connected to the inner wall of the resonant cavity (3) facing the coupling channel (1). A telescopic tuning pin (7) is arranged at the central position of the resonant cavity (3) perpendicular to the component of the magnetic field direction.

2. The millimeter-wave magnetic coupling variable resonance equalizer according to claim 1, wherein: The resonant cavity (3) includes a housing (31) and a cover plate (32). The cover plate (32) is detachably and hermetically connected to the housing (31) through a flange plate. A limit clamping block (33) is arranged on the inner wall of the cover plate (32). An installation sliding groove matching the limit clamping block (33) is formed on the opposite surface of the guiding block (6).

3. The millimeter-wave magnetic coupling variable resonance equalizer according to claim 1, characterized in that: The outer end of the guiding block (6) is in an inverted triangular shape, and its tip corresponds to the central position of the coupling channel (1).

4. A millimeter-wave magnetic coupling variable resonance equalizer according to claim 1, characterized in that: The four sides of the adjusting block (4) are in contact with the inner wall of the resonant cavity (3). Adjusting rods (41) are threadedly connected to both ends of the resonant cavity (3). The inner ends of the adjusting rods (41) are rotationally and fixedly connected to the outer sides of the adjusting blocks (4). First adjusting knobs (42) are fixedly connected to the outer ends of the adjusting rods (41).

5. A millimeter-wave magnetic coupling variable resonance equalizer according to claim 1, characterized in that: The adjusting pin (7) is connected to a side wall of the resonant cavity (3) through a fine thread. A second adjusting knob (71) is fixedly connected to the outer end of the adjusting pin (7).

6. The millimeter-wave magnetic coupling variable resonance equalizer according to any one of claims 1-5, characterized in that: A plurality of coupling channels (2) and resonant cavities (3) are equidistantly distributed on both sides of the narrow side of a single transmission waveguide channel (1).

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