A filter power division structure and its adjustment method

Abstract

The present application discloses a filter power division structure and a method for adjusting the same, wherein the filter power division structure comprises: a common end connected with at least one first resonator; a first output end connected with at least one second resonator; a second output end connected with at least one third resonator; a load end connected with at least one fourth resonator; the first resonator and the second resonator are coupled and connected via a first coupling structure; the first resonator and the third resonator are coupled and connected via a second coupling structure; the fourth resonator and the second resonator are coupled and connected via a third coupling structure; the fourth resonator and the third resonator are coupled and connected via a fourth coupling structure; wherein the transmission coefficient between the first output end and the second output end is 0. The present application can realize any power distribution ratio, isolate the branch ports from each other, and increase the power that the load can withstand.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a structure for implementing high-power filtering and a method for adjusting the structure. Background Art

[0002] Filters and power dividers are two very common devices in RF transceiver links. Filters are used to select the frequency of signals in RF links, suppress RF signals in specific frequency bands, and pass RF signals in useful frequency bands with low loss; while power dividers are used to achieve power distribution of RF link signals. In traditional technologies, filters and power dividers are generally discrete devices connected by transmission lines. Transmission lines introduce additional losses, and mismatch of transmission lines also affects link losses. Summary of the invention

[0003] The embodiment of the present application provides a filtering power divider structure for solving the technical problems of large volume and high loss caused by the separation of the filter and the power divider in the prior art.

[0004] In a first aspect of the present application, a filtering power division structure is provided, comprising:

[0005] A common end connected to at least one first resonator;

[0006] The first output terminal is connected to at least one second resonator;

[0007] The second output terminal is connected to at least one third resonator;

[0008] The load end is connected with at least one fourth resonator;

[0009] The first resonator and the second resonator are coupled to each other via a first coupling structure;

[0010] The first resonator and the third resonator are coupled to each other via a second coupling structure;

[0011] The fourth resonator is coupled to the second resonator via a third coupling structure;

[0012] The fourth resonator is coupled to the third resonator via a fourth coupling structure;

[0013] Wherein, the transmission coefficient between the first output end and the second output end is 0.

[0014] Further, in the present application, the first resonator, the second resonator, the third resonator and the fourth resonator are in the form of at least one of the following: a lumped resonator, a coaxial resonator, and a waveguide resonator.

[0015] Furthermore, in the present application, the first coupling structure, the second coupling structure, the third coupling structure, and the fourth coupling structure include at least one of the following: a window structure, an adjustment screw, and a reinforcing rib.

[0016] Furthermore, in the present application, a load is connected to the fourth resonator via an interface.

[0017] According to an aspect of the present application, a method for adjusting a filter power division structure is provided, by adjusting the first coupling structure and the second coupling structure to adjust the relative size of the coupling between the first resonator and the second resonator, and between the first resonator and the third resonator, thereby adjusting the output power ratio between the first output end and the second output end.

[0018] Further, in the present application, the adjusting the relative magnitude of the coupling between the first resonator and the second resonator, and between the first resonator and the third resonator, includes at least one of the following methods:

[0019] Adjust the size of the window, adjust the presence and size of the adjusting screws, and adjust the size and position of the reinforcing ribs.

[0020] Furthermore, in the present application, the adjustment method of the filtering power division structure also includes: defining the transmission path between the first output terminal and the second output terminal that passes through the common terminal as the first transmission path, and the transmission path between the first output terminal and the second output terminal that passes through the load terminal as the second transmission path, and adjusting the coupling coefficient amplitude and phase of the third coupling structure and the fourth coupling structure so that the transmission coefficient amplitudes of the first transmission path and the second transmission path are equal and opposite in phase.

[0021] Beneficial effects:

[0022] The filter power splitting structure of the present application combines the filter and the power splitter into one device, and adjusts the power ratio of the two branch ports by adjusting the coupling ratio between the resonator connected to the common end and the two adjacent resonators. The resonator and the coupling structure on each power branch simultaneously form a filtering structure on each branch, so that each power branch has filtering characteristics. By adjusting the resonant frequency of the resonator and the coupling structure, the design of a specific filtering center frequency and bandwidth can be realized more conveniently.

[0023] The matching of each port and the isolation of the two branch ports are achieved through the load resonator, and a high-power load can be connected externally. Therefore, the load-bearing power is no longer a bottleneck for high-power design. In theory, as long as the resonator and coupling structure are carefully designed, it can be used for high-power power division and filtering to achieve any power division ratio and arbitrary filtering characteristics, which is beneficial to improving system integration, reducing volume and reducing link loss. It plays an important role in improving the loss of the RF link of radar and communication systems, the overall efficiency, and the signal-to-noise ratio performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 It is a schematic diagram of the topological structure of the filtering power division structure of an embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of the overall appearance of the coaxial resonator structure implementation form of the embodiment of the present application.

[0027] Figure 3 It is a perspective view of the overall appearance of the coaxial resonator structure implementation form of the embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of a filtering power division structure in the form of a coaxial resonator structure implementation form of an embodiment of the present application.

[0029] Figure 5 It is a schematic diagram of a filtering power division structure in the form of a coaxial resonator structure implementation form of an embodiment of the present application.

[0030] Figure 6 It is a schematic diagram of a filtering power division structure in the form of a coaxial resonator structure implementation form of an embodiment of the present application.

[0031] Figure 7 It is a waveform diagram of two power branches in the full-wave simulation of an embodiment of the present application.

[0032] Figure 8 This is the simulation result of the isolation between the two power splitter ports of the filter power splitter of the embodiment of the present application.

[0033] In the figure, the meanings of the reference numerals are as follows:

[0034] Shell 0; first resonator 1; second resonator 2; third resonator 3; fourth resonator 4; common terminal 5; first output terminal 6; second output terminal 7; load terminal 8; second coupling structure 9; first coupling structure 10; fourth coupling structure 11; third coupling structure 12; metal adjustment screws 9-1, 10-1, 12-1; metal coupling reinforcement ribs 9-2, 10-2, 11-1, 12-2. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] like Figure 1 , which is a topological structure diagram of a filtering power division structure according to an embodiment of the present application, Figure 2 The appearance of a simulation practice of the above topological structure includes a housing 0 and a filter power distribution structure disposed in the housing 0, such as Figure 3 Shown is Figure 2 Perspective drawing of Figure 2 and Figure 3 It can be seen that the filtering power division structure includes an internal structure and a plurality of ports, and the internal structure is connected to the inside and outside of the housing 0 through the plurality of ports. Figure 4 As shown, it is a top view schematic diagram of the filtering power division structure, combined with Figure 4 and Figure 1 It can be seen that the filtering power division structure includes:

[0039] The common end 5 is connected to at least one first resonator 1; the first output end 6 is connected to at least one second resonator 2; the second output end 7 is connected to at least one third resonator 3; the load end 8 is connected to at least one fourth resonator 4; the first resonator 1 is coupled to the second resonator 2 via a first coupling structure 10; the first resonator 1 is coupled to the third resonator 3 via a second coupling structure 9; the fourth resonator 4 is coupled to the second resonator 2 via a third coupling structure 12; the fourth resonator 4 is coupled to the third resonator 3 via a fourth coupling structure 11; wherein the transmission coefficient between the first output end 6 and the second output end 7 is 0.

[0040] In the above embodiment, the first resonator 1, the second resonator 2, the third resonator 3 and the fourth resonator 4 are all RF resonators working in the used frequency band, and the RF resonators are connected through the RF energy coupling adjustment structure. Figure 1 The connection lines between the resonators are marked.

[0041] Figure 1 IN in the figure represents a common terminal 5, and the common terminal 5 is connected to the second resonator 2 and the third resonator 3 through the first resonator 1 through a coupling structure, so as to form two power branches, wherein the first power branch is composed of the first resonator 1, the second resonator 2 and the first coupling structure 10, the coupling of the common terminal 5 and the coupling of the first output terminal 6, wherein the second power branch is composed of the first resonator 1, the third resonator 3 and the second coupling structure 9, the coupling of the common terminal 5 and the coupling of the second output terminal 7, and the power from the common terminal 5 is distributed through the first power branch and the second power branch and respectively Figure 1 OUT1 and OUT2 in the DAC are used as branch ports.

[0042] Figure 1 The symbol LOAD indicates a load end 8, and the load end 8 is connected to the second resonator 2 and the third resonator 3 through a coupling structure through a fourth resonator 4, so as to adjust the matching of each branch port and absorb the reflected energy of the two branch ports.

[0043] Above Figure 1 It is a basic topological structure. According to different filtering requirements of each branch, the number and topology of resonators in each branch can be modified while maintaining the fourth resonator 4 as an additional branch, which will not be elaborated here.

[0044] In this embodiment, the resonator directly constitutes a branch circuit, and through the introduction of the fourth resonator 4, multiple signal paths are introduced between the branch ports, so that the signals of the multiple paths cancel each other out after superposition, and the sum is zero, so that the transmission signal between the branch ports is 0, thereby realizing mutual isolation of the branch ports.

[0045] In the above structure, the power ratio of the two branch ports can be adjusted by adjusting the coupling ratio between the resonator connected to the common terminal 5 and the two adjacent resonators, so it can be used for power distribution with any power division ratio. The resonator and coupling structure on each power branch simultaneously constitute a filtering structure on each branch, so that each power branch has filtering characteristics. By adjusting the resonant frequency of the resonator and the coupling structure, the design of a specific filtering center frequency and bandwidth can be realized more conveniently.

[0046] In some preferred implementations, the first resonator 1, the second resonator 2, the third resonator 3 and the fourth resonator 4 are in the form of at least one of the following: a lumped resonator, a coaxial resonator, and a waveguide resonator.

[0047] In some preferred implementations, the first coupling structure 10, the second coupling structure 9, the third coupling structure 12, and the fourth coupling structure 11 include at least one of the following: a window structure, an adjustment screw, and a reinforcing rib. Those skilled in the art can adjust and select the above specific coupling structure forms according to the simulation results.

[0048] like Figure 2-6 The simulation model shown is Figure 1 An embodiment of the implementation form of the topological structure shown in FIG. 1 , in this embodiment, the resonator is a coaxial resonator, and each coaxial resonator ( Figure 4 In 1, 2, 3, and 4), the coupling is adjusted by opening a window on the metal cavity and adding a coupling-reinforcing metal structure in the window. For example, enlarging the window can increase the coupling between two adjacent coaxial resonators, increasing the height of the metal coupling reinforcement rib can increase the coupling between two adjacent coaxial resonators, and reducing the distance between the metal sheet and the resonator can increase the coupling between two adjacent coaxial resonators. The effect can be calculated through simulation, so I will not go into details here. Specifically, Figure 5 and Figure 6 As shown in the openings, the first coupling structure 10, the second coupling structure 9 and the third coupling structure 12 have metal adjustment screws 10-1, 9-1 and 12-1 for increasing coupling. According to the simulation results, increasing the length of the metal adjustment screws can enhance the coupling between the resonators. Figure 5 and Figure 6 The openings shown in the figure also contain metal coupling reinforcement ribs 10-2, 9-2 and 12-2. According to the simulation results, increasing the height or width of the reinforcement ribs can enhance the coupling between the resonators. The opening corresponding to the fourth coupling structure 11 contains a metal coupling reinforcement rib 11-1 that reverses the coupling phase by 180° and can adjust the coupling amplitude of the fourth coupling structure 11 by adjusting its size.

[0049] By adjusting the relative coupling size between the resonator connected to the common end 5 and the two adjacent resonators, the RF energy coupling ratio of the two branches can be adjusted, thereby adjusting the output power ratio of the two branch ports.

[0050] Due to the introduction of the fourth resonator 4, the transmission path between the two branch ports has an additional path coupled through the fourth resonator 4 in addition to the original path passing through the common terminal 5. By adjusting the coupling coefficient amplitude and phase of the coupling structure connected to the load resonator, theoretically, the transmission coefficient amplitudes of the two transmission paths can be made equal and opposite in phase. At this time, the transmission coefficient between the two branch ports is the superposition of the transmission coefficients of the two paths, and the sum is zero, that is, the two ports are isolated from each other.

[0051] In some preferred implementations, the fourth resonator 4 realizes the matching of each port and the isolation of the two branch ports, and a high-power load can be connected externally, so a load is connected to the fourth resonator 4 through an interface. At this time, the load-bearing power is no longer a bottleneck of high-power design. In theory, as long as the resonator and the coupling structure are matched well, it can be used for high-power power division and filtering.

[0052] The embodiments of the present application also provide a method for adjusting a filtering power division structure, which is the same inventive concept as the above-mentioned embodiments. By adjusting the first coupling structure 10 and the second coupling structure 9, the relative size of the coupling between the first resonator 1 and the second resonator 2, and between the first resonator 1 and the third resonator 3 is adjusted, thereby adjusting the output power ratio between the first output terminal 6 and the second output terminal 7.

[0053] The embodiment of the present invention uses a resonator to directly form a branch circuit, which has high integration and low link loss.

[0054] In some preferred embodiments, the adjusting the relative magnitude of the coupling between the first resonator 1 and the second resonator 2, and between the first resonator 1 and the third resonator 3, comprises at least one of the following methods:

[0055] Adjust the size of the window, adjust the presence and size of the adjusting screws, and adjust the size and position of the reinforcing ribs.

[0056] In some preferred embodiments, it also includes: defining the transmission path between the first output terminal 6 and the second output terminal 7 that passes through the common terminal 5 as the first transmission path, and the transmission path between the first output terminal 6 and the second output terminal 7 that passes through the load terminal 8 as the second transmission path, adjusting the coupling coefficient amplitude and phase of the third coupling structure 12 and the fourth coupling structure 11, so that the transmission coefficient amplitudes of the first transmission path and the second transmission path are equal and opposite in phase. By introducing the fourth resonator 4 at the load terminal 8, the isolation between the branch ports is improved, and a high-power load can be connected externally, making high-power design possible.

[0057] The key to this embodiment is to use resonators to form a branching path, and to introduce load resonators to achieve matching and isolation of the branching port, so as to facilitate high-power design. Different resonator and coupling structure implementation forms are only simple extensions of the technology. The specific implementation of the resonator, coupling windowing, etc. can refer to the existing technology. The resonator and coupling form described in this embodiment are not limited to the specific resonator and coupling structure implementation forms that can be applied in this application. Personnel in the relevant technical fields of the filter field can quickly establish an implementation model based on the method provided by this implementation and the above-mentioned topological structure.

[0058] like Figure 7 The waveforms of the two adjusted power branches are shown in the figure. The blue and green curves are the transmission coefficients in logarithmic format from the common port to the two branch ports. It can be seen that the difference in the power distribution of the two ports is about 7.7dB in the required operating frequency range of 2.7~2.9GHz, and the remaining curves are return losses. The transmission coefficients of the two branches gradually decrease outside the operating frequency range of 2.7~2.9GHz, so the signals outside the operating frequency band of 2.7~2.9GHz can be suppressed, and the functions of power division and filter are realized at the same time under the application of large power division ratio.

[0059] like Figure 8 The figure shows the simulation result of the isolation between the two power divider ports of the filter power divider. Figure 8 It can be seen that, in the case of having the load end 8, the isolation between the two power division ports is high, achieving the expected isolation effect.

[0060] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for adjusting a filter power division structure, characterized in that: The filtering power division structure comprises: A common end connected to at least one first resonator; The first output terminal is connected to at least one second resonator; The second output terminal is connected to at least one third resonator; The load end is connected with at least one fourth resonator; The first resonator and the second resonator are coupled to each other via a first coupling structure; The first resonator and the third resonator are coupled to each other via a second coupling structure; The fourth resonator is coupled to the second resonator via a third coupling structure; The fourth resonator is coupled to the third resonator via a fourth coupling structure; Wherein, the transmission coefficient between the first output end and the second output end is 0, and the branch ports are isolated from each other; By adjusting the first coupling structure and the second coupling structure, the relative magnitude of the coupling between the first resonator and the second resonator and between the first resonator and the third resonator is adjusted, thereby adjusting the output power ratio between the first output end and the second output end; Define the transmission path between the first output terminal and the second output terminal that passes through the common terminal as the first transmission path, define the transmission path between the first output terminal and the second output terminal that passes through the load terminal as the second transmission path, and adjust the coupling coefficient amplitude and phase of the third coupling structure and the fourth coupling structure so that the transmission coefficient amplitudes of the first transmission path and the second transmission path are equal and opposite in phase.

2. The method according to claim 1, characterized in that The first resonator, the second resonator, the third resonator and the fourth resonator are in the form of at least one of the following: a lumped resonator, a coaxial resonator, and a waveguide resonator.

3. The method according to claim 1, characterized in that The first coupling structure, the second coupling structure, the third coupling structure and the fourth coupling structure may be in the form of at least one of the following: a window structure, an adjusting screw and a reinforcing rib.

4. The method according to claim 1, characterized in that: The fourth resonator is connected to a load via an interface.

5. The method according to claim 1, characterized in that The adjusting the relative magnitude of the coupling between the first resonator and the second resonator, and between the first resonator and the third resonator, comprises at least one of the following methods: Adjust the size of the window, adjust the presence and size of the adjusting screws, and adjust the size and position of the reinforcing ribs.

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