Filter and filter zero point polarity conversion method

Abstract

The application discloses a filter and a filter zero point polarity conversion method. The zero point polarity conversion structure comprises a metal resonator, a first dielectric resonator and a second dielectric resonator. The first dielectric resonator is coupled with the metal resonator through a first window. The second dielectric resonator is coupled with the metal resonator through a second window and coupled with the first dielectric resonator through a third window. A connecting cavity is formed between the first window and the second window and is separated by a partition. A waveguide is input into the filter through a waveguide input end and is output through a waveguide output end. The metal resonator and the first dielectric resonator or the second dielectric resonator connected with the waveguide output end generate zero points. By removing the partition of the connecting cavity, the zero point polarity of the metal resonator and the first dielectric resonator or the second dielectric resonator connected with the waveguide output end can be converted, so that the conversion cost of the zero point polarity is reduced.

Description

Technical Field

[0001] This invention relates to the field of filter technology, specifically to a filter and a method for zero-point polarity transformation of the filter. Background Technology

[0002] As a fundamental radio frequency unit, filters significantly impact overall system performance through parameters such as insertion loss, out-of-band rejection, passive intermodulation, and power capacity. Hybrid cavity filters are widely used in antenna feed systems because they effectively address the high insertion loss caused by high near-end rejection. However, due to structural limitations within the filter, when the dielectric resonator and the metal resonator couple, the TE01 mode transforms into the TEM mode due to mode transition. The electric fields of these two modes are orthogonal, making energy transfer difficult.

[0003] In traditional cavity filters, to achieve a transmission zero at the low end of the passband, structural elements such as booms are typically added at the cross-coupling points to achieve a negative coupling coefficient, i.e., capacitive coupling. This method of achieving a zero is relatively simple and difficult to implement in some cavities with structural constraints. For example, patent document CN106025467A discloses a coupling structure for a dielectric multi-cavity filter. This coupling structure includes a cavity and dielectric resonators, a first metal resonator, and a second metal resonator fixed within the cavity. The dielectric resonator, the first metal resonator, and the second metal resonator are arranged in a V-shape within the cavity. The dielectric resonator is coupled to the first metal resonator via a first ridge line, the dielectric resonator is coupled to the second metal resonator via a second ridge line, and the first metal resonator is coupled to the second metal resonator via a coupling window. This coupling structure allows for easy selection of the polarity of the transmission zero by adjusting the opening direction of the coupling ridges.

[0004] Although existing filters can achieve zero-point polarity transformation by changing the opening direction of the ridge line, changing the opening direction of the ridge line is equivalent to forming a completely new coupling structure, which is more difficult to manufacture and more expensive, thus resulting in higher costs for achieving zero-point polarity transformation. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a filter and a filter zero-point polarity conversion method to solve the technical problem of high cost of filter zero-point polarity conversion in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a filter, comprising a cavity having a resonant cavity and a cover plate fastened to the cavity, wherein a resonant rod is installed inside the resonant cavity to form a resonator, the resonator comprising:

[0008] Metal resonator;

[0009] A first dielectric resonator forms a first window with the metal resonator and is coupled to the metal resonator through the first window;

[0010] The second dielectric resonator forms a second window with the metal resonator and a third window with the first dielectric resonator. The second dielectric resonator is coupled to the metal resonator through the second window and to the first dielectric resonator through the third window.

[0011] A connecting cavity is disposed in the metal resonator and connects the first window and the second window; and

[0012] A partition rib is provided in the connecting cavity to isolate the connecting cavity.

[0013] In some embodiments, a step is provided inside the resonant cavity of the metal resonator, and the connecting cavity is formed on the step.

[0014] In some embodiments, an intermediate column is formed between the metal resonator, the first dielectric resonator, and the second dielectric resonator, and the two ends of the partition are respectively connected to the intermediate column and the step.

[0015] In some embodiments, the first window is provided with a first ridge line, which connects to the intermediate column.

[0016] In some embodiments, the second window is provided with a second ridge, and the second window is formed between the second ridge and the intermediate column.

[0017] In some embodiments, the height of the rib is the same as the height of the step.

[0018] Secondly, the present invention also provides a method for zero-point polarity transformation of a filter, comprising the following steps:

[0019] The waveguide is input to the filter at the waveguide input end and output at the waveguide output end. The metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide output end generate zeros.

[0020] Remove the reinforcing bars and change the zero-point polarity generated by the metal resonator and the first or second dielectric resonator connected to the waveguide output terminal.

[0021] In some embodiments, in the step of the waveguide inputting the filter at the waveguide input end and outputting the filter at the waveguide output end, the waveguide inputs a metal resonator at the waveguide input end and outputs the filter through the waveguide output end connected to a first dielectric resonator or a second dielectric resonator. The zero-point polarity generated by the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide output end is negative.

[0022] In the step of removing the reinforcing bars and changing the zero-point polarity, the zero-point polarity change generated by the metal resonator and the first or second dielectric resonator connected to the waveguide output terminal is positive.

[0023] In some embodiments, in the step of the waveguide inputting the filter at the waveguide input end and outputting the filter at the waveguide output end, the waveguide inputs a first dielectric resonator or a second dielectric resonator connected to the waveguide input end and outputs the filter through a waveguide output end connected to a metal resonator. The zero-point polarity generated by the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide output end is positive.

[0024] In the step of removing the reinforcing bars and changing the zero-point polarity, the zero-point polarity change generated by the metal resonator and the first or second dielectric resonator connected to the waveguide input terminal is negative.

[0025] Compared with the prior art, the filter provided by the present invention, by setting a metal resonator, a first dielectric resonator and a second dielectric resonator, wherein the first dielectric resonator is coupled to the metal resonator through a first window, the second dielectric resonator is coupled to the metal resonator through a second window and to the first dielectric resonator through a third window, and a connecting cavity is formed between the first window and the second window by a partition. When this structure is used as a filter for waveguide transmission, the waveguide is input to the filter from the waveguide input end and output from the waveguide output end. The metal resonator and the first or second dielectric resonator connected to the waveguide output end generate zeros. By removing the partition of the connecting cavity, the zero polarity of the metal resonator and the first or second dielectric resonator connected to the waveguide output end can be changed, thereby reducing the difficulty and cost of zero polarity transformation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the filter structure provided in an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Response diagram of the mid-bandpass zero point;

[0028] Figure 3 This is a schematic diagram of the filter structure with the ribs removed according to an embodiment of the present invention;

[0029] Figure 4 yes Figure 3 Response diagram of the mid-bandpass zero point;

[0030] Figure 5 This is a schematic diagram of the filter structure provided in the first embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the filter structure provided in the second embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the filter structure provided in the third embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the filter structure provided in the fourth embodiment of the present invention;

[0034] Figure 9 This is a flowchart of the filter zero-point polarity transformation method provided in an embodiment of the present invention.

[0035] Labels for each item in the figure:

[0036] 10—Metal resonator; 11—First window; 12—Second window

[0037] 13—Step 20—First dielectric resonator 30—Second dielectric resonator

[0038] 31—Third window; 40—Connecting cavity; 50—Separator

[0039] 60—Intermediate post; 70—Waveguide input terminal; 80—Waveguide output terminal

[0040] 111—First ridge line; 121—Second ridge line. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0042] To address the high cost of zero-point polarity transformation in existing technologies, this invention provides a filter and a method for zero-point polarity transformation, thereby reducing the difficulty and cost of transforming the zero-point polarity of the filter.

[0043] The filter provided in the embodiments of the present invention, such as Figure 1 and 5As shown in Figure -8, the device includes a cavity with a resonant cavity and a cover plate fastened to the cavity. A resonator composed of resonant rods is installed inside the resonant cavity. The resonator includes a metal resonator 10, a first dielectric resonator 20, a second dielectric resonator 30, a connecting cavity 40, and a partition 50. A first window 11 is formed between the first dielectric resonator 20 and the metal resonator 10, and the first dielectric resonator 20 is coupled to the metal resonator 10 through the first window 11. A second window 12 is formed between the second dielectric resonator 30 and the metal resonator 10, and a third window 31 is formed between the second dielectric resonator 30 and the first dielectric resonator 20. The second dielectric resonator 30 is coupled to the metal resonator 10 through the second window 12 and to the first dielectric resonator 20 through the third window 31. The connecting cavity 40 is disposed on the metal resonator 10 and connects the first window 11 and the second window 12. The partition 50 is disposed in the connecting cavity 40 to isolate the connecting cavity 40.

[0044] Specifically, by setting up a metal resonator 10, a first dielectric resonator 20, and a second dielectric resonator 30, the first dielectric resonator 20 is coupled to the metal resonator 10 through a first window 11, the second dielectric resonator 30 is coupled to the metal resonator 10 through a second window 12, and is coupled to the first dielectric resonator 20 through a third window 31. The metal resonator 10, the first dielectric resonator 20, and the second dielectric resonator 30 are mutually coupled to form a hybrid filter structure.

[0045] like Figure 1 As shown, a connecting cavity 40, separated by a partition 50, is formed between the first window 11 and the second window 12. When this structure functions as a filter for waveguide transmission, the waveguide is input to the filter from the waveguide input terminal 70 and output from the waveguide output terminal 80. The metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output terminal 80 generate zeros, according to... Figure 2 The bandpass zero-point response diagram shows that when there is a 50mm rib, zero point a is formed on the left side of the bandpass region.

[0046] After removing 50mm of the reinforcing bars, the following is formed Figure 3 The zero-point polarity transformation structure shown is based on Figure 4 As can be seen from the bandpass zero-point response diagram, after the 50mm rib is removed, zero point b is formed on the right side of the bandpass region, that is, the polarity of the zero point changes at this time.

[0047] Therefore, by removing the partition 50 of the connecting cavity 40, the zero polarity of the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output terminal 80 can be changed, thereby reducing the difficulty and cost of zero polarity transformation.

[0048] In this embodiment, the zero-point polarity transformation structure can use the metal resonator 10 as the waveguide input and the first dielectric resonator 20 or the second dielectric resonator 30 as the waveguide output, or use the first dielectric resonator 20 or the second dielectric resonator 30 as the waveguide input and the metal resonator 10 as the waveguide output. When the waveguide input is made using the metal resonator 10 through the above structure, the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 with polarized waveguide input form a negative polarity zero. When the partition 50 is removed, the polarity of the zeros of the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 with waveguide output changes to positive. When the waveguide input is made using the first dielectric resonator 20 or the second dielectric resonator 30, the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 with waveguide input form a positive polarity zero. When the partition 50 is removed, the polarity of the zeros of the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 with waveguide input changes to negative.

[0049] In this embodiment, the first dielectric resonator 20 and the second dielectric resonator 30 are TE-mode dielectric filters.

[0050] In one embodiment, such as Figure 1 , 3 As shown in Figures 5-8, a step 13 is provided inside the resonant cavity of the metal resonator 10, and the connecting cavity 40 is formed on the step 13. Specifically, by changing the height of the step 13, the coupling strength between the metal resonator 10 and the first dielectric resonator 20 and the second dielectric resonator 30 can be adjusted.

[0051] In one embodiment, the height of the rib 50 is the same as the height of the step 13. Specifically, by setting the height of the rib 50 to be the same as the height of the step 13, the groove structure with the rib 50 can be formed simply by processing the step 13 near the first window 11 and the second window 12, thus facilitating the molding of the filter.

[0052] In one embodiment, such as Figure 1 , 3 As shown in Figures 5-8, an intermediate pillar 60 is formed between the metal resonator 10, the first dielectric resonator 20, and the second dielectric resonator 30. The two ends of the partition 50 are connected to the intermediate pillar 60 and the step 13, respectively.

[0053] In one embodiment, such as Figure 1 , 3As shown in Figures 5-8, the first window 11 is provided with a first ridge 111, which connects to the intermediate post 60. Specifically, by setting the first ridge 111, a T-shaped coupling window structure can be formed between the metal resonator 10 and the first dielectric resonator 20. If the metal resonator 10 and the first dielectric resonator 20 are used as the input or output of the waveguide, the zero-point polarity of the metal resonator 10 and the first dielectric resonator 20 can be changed by changing the length of the first ridge 111 or adjusting the position of the first ridge 111 to make the first ridge 111 spaced from the intermediate post 60.

[0054] In one embodiment, such as Figure 1 , 3 As shown in Figures 5-8, the second window 12 is provided with a second ridge 121, and the second window 12 is formed between the second ridge 121 and the intermediate post 60. Specifically, by providing the second ridge 121, a T-shaped coupling window structure can be formed between the metal resonator 10 and the second dielectric resonator 30. If the metal resonator 10 and the second dielectric resonator 30 are used as the input or output of the waveguide, the zero-point polarity of the metal resonator 10 and the second dielectric resonator 30 can be changed by changing the length of the second ridge 121 or adjusting the position of the second ridge 121 to make the second ridge 121 spaced from the intermediate post 60.

[0055] The filter in this embodiment of the invention further includes a waveguide input terminal 70, a waveguide output terminal 80, and the filter itself. The waveguide input terminal 70 is connected to the metal resonator 10, and the waveguide output terminal 80 is connected to either the first dielectric resonator 20 or the second dielectric resonator 30, or vice versa. Specifically, by setting the above-mentioned zero-point polarity transformation structure, when a change in the zero-point polarity between the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 is required, only the partition 50 of the connecting rib needs to be removed, thereby reducing the difficulty and cost of changing the zero-point polarity of the filter.

[0056] In the first embodiment, as Figure 5 As shown, the waveguide input terminal 70 is connected to the metal resonator 10, and the waveguide output terminal 80 is connected to the first dielectric resonator 20. The zero polarity formed by the metal resonator 10 and the first dielectric resonator 20 is negative. By removing the partition 50, the zero polarity formed by the metal resonator 10 and the first dielectric resonator 20 can be transformed to positive.

[0057] In the second embodiment, as Figure 6As shown, the waveguide input terminal 70 is connected to the metal resonator 10, and the waveguide output terminal 80 is connected to the second dielectric resonator 30. The zero polarity formed by the metal resonator 10 and the second dielectric resonator 30 is negative. By removing the partition 50, the zero polarity formed by the metal resonator 10 and the second dielectric resonator 30 can be transformed to positive.

[0058] In the third embodiment, as Figure 7 As shown, the waveguide output terminal 80 is connected to the metal resonator 10, and the waveguide input terminal 70 is connected to the first dielectric resonator 20. The zero polarity formed by the metal resonator 10 and the first dielectric resonator 20 is positive. By removing the partition 50, the zero polarity formed by the metal resonator 10 and the first dielectric resonator 20 can be transformed to negative.

[0059] In the fourth embodiment, as Figure 8 As shown, the waveguide output terminal 80 is connected to the metal resonator 10, and the waveguide input terminal 70 is connected to the second dielectric resonator 30. The zero polarity formed by the metal resonator 10 and the second dielectric resonator 30 is negative. By removing the partition 50, the zero polarity formed by the metal resonator 10 and the second dielectric resonator 30 can be transformed to positive.

[0060] This invention also provides a method for zero-point polarity transformation of a filter, such as... Figure 9 As shown, it includes the following steps:

[0061] The waveguide is input to the filter at the waveguide input terminal 70 and output at the waveguide output terminal 80. The metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output terminal 80 generate zeros.

[0062] Remove the rib 50 to change the zero-point polarity generated by the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output terminal 80.

[0063] Specifically, the above-described steps for transforming the zero-point polarity of the filter can effectively reduce the difficulty and cost of transforming the zero-point polarity.

[0064] In one embodiment, in the step where the waveguide is input to the filter from the waveguide input terminal 70 and output from the waveguide output terminal 80, the waveguide is input to the metal resonator 10 from the waveguide input terminal 70 and output through the waveguide output terminal 80 connected to the first dielectric resonator 20 or the second dielectric resonator 30. The zero polarity generated by the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output terminal 80 is negative.

[0065] In the step of removing the reinforcing bar 50 and changing the zero-point polarity, the zero-point polarity change generated by the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output terminal 80 is positive.

[0066] In one embodiment, in the step where the waveguide is input to the filter from the waveguide input terminal 70 and output from the waveguide output terminal 80, the waveguide is input to the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide input terminal 70 and output through the waveguide output terminal 80 connected to the metal resonator 10. The zero polarity generated by the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output terminal 80 is positive.

[0067] In the step of removing the reinforcing bar 50 and changing the zero-point polarity, the zero-point polarity change generated by the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide input terminal 70 is negative.

[0068] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A filter, comprising a cavity having a resonant cavity and a cover plate fastened to the cavity, wherein a resonant rod is installed within the resonant cavity to form a resonator, characterized in that, include: Metal resonator; A first dielectric resonator forms a first window with the metal resonator and is coupled to the metal resonator through the first window; The second dielectric resonator forms a second window with the metal resonator and a third window with the first dielectric resonator. The second dielectric resonator is coupled to the metal resonator through the second window and to the first dielectric resonator through the third window. A connecting cavity is disposed in the metal resonator and connects the first window and the second window; and A rib is provided in the connecting cavity; The filter zero-point polarity transformation method includes the following steps: The waveguide is input to the filter at the waveguide input end and output at the waveguide output end. The metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide output end generate zeros. Remove the reinforcing bars and change the zero-point polarity generated by the metal resonator and the first or second dielectric resonator connected to the waveguide output terminal.

2. The filter according to claim 1, characterized in that, The resonant cavity of the metal resonator is provided with a step, and the connecting cavity is opened on the step.

3. The filter according to claim 2, characterized in that, An intermediate column is formed between the metal resonator, the first dielectric resonator, and the second dielectric resonator, and the two ends of the partition rib are respectively connected to the intermediate column and the step.

4. The filter according to claim 3, characterized in that, The first window is provided with a first ridge line, which connects to the intermediate column.

5. The filter according to claim 3, characterized in that, The second window is provided with a second ridge line, and the second window is formed between the second ridge line and the intermediate column.

6. The filter according to claim 2, characterized in that, The height of the rib is the same as the height of the step.

7. The filter according to claim 1, characterized in that, In the step of inputting the filter from the waveguide input end and outputting it from the waveguide output end, the waveguide input end is connected to a metal resonator and outputs it through the waveguide output end connected to a first dielectric resonator or a second dielectric resonator. The zero-point polarity generated by the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide output end is negative. In the step of removing the reinforcing bars and changing the zero-point polarity, the zero-point polarity change generated by the metal resonator and the first or second dielectric resonator connected to the waveguide output terminal is positive.

8. The filter according to claim 7, characterized in that, In the step of inputting the filter from the waveguide input end and outputting it from the waveguide output end, the waveguide input end is connected to a first dielectric resonator or a second dielectric resonator, and outputs it through the waveguide output end connected to a metal resonator. The zero polarity generated by the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide output end is positive. In the step of removing the reinforcing bars and changing the zero-point polarity, the zero-point polarity change generated by the metal resonator and the first or second dielectric resonator connected to the waveguide input terminal is negative.

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