Filter and filter zero point polarity conversion method

Abstract

The invention discloses a filter and a filter zero point polarity conversion method, a 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 the metal resonator is coupled with the first dielectric resonator through a second window. The metal resonator is connected with the first dielectric resonator and is coupled with the first dielectric resonator through the third window, a connecting cavity separated by a separating rib is formed between the first window and the second window, the waveguide is input into the filter through the waveguide input end and output through the waveguide output end, and the metal resonator and the first dielectric resonator or the second dielectric resonator connected with the waveguide output end generate a zero point. And 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 changed by digging out the separation ribs of the connecting cavity, so that the conversion cost of the zero point polarity is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and in particular to a filter and a method for transforming the zero point polarity of the filter. Background Art

[0002] As a basic RF unit, the filter has a series of indicators such as insertion loss, out-of-band suppression, passive intermodulation and power capacity, which have an important impact on the performance of the whole machine. Hybrid cavity filters are widely used in antenna feed systems because they effectively solve the problem of high insertion loss caused by near-end high suppression. However, due to structural limitations and other factors inside the filter, when the dielectric resonant cavity and the metal resonant cavity are coupled, due to the mode transition, the TE01 mode is converted to the TEM mode, and the electric fields of the two are orthogonal, making it difficult to transmit energy.

[0003] In traditional cavity filters, to achieve a transmission zero at the low end of the passband, a flying rod or other structural object is generally added at the cross-coupling to achieve a negative coupling coefficient, that is, to achieve capacitive coupling. This method of achieving a zero is relatively simple, and it is difficult to achieve in some cavities with restricted structures. For example, the patent document with publication number CN106025467A discloses a coupling structure of a dielectric multi-cavity filter, wherein the coupling structure includes a cavity and a dielectric resonator, a first metal resonator, and a second metal resonator fixed in the cavity; the dielectric resonator, the first metal resonator, and the second metal resonator are distributed in a V-shaped structure in the cavity; the dielectric resonator and the first metal resonator are coupled through a first ridge line, the dielectric resonator and the second metal resonator are coupled through a second ridge line, and the first metal resonator and the second metal resonator are coupled through a coupling window. The coupling structure facilitates the polarity selection of the transmission zero by adjusting the opening direction of the coupling ridge line.

[0004] Although the existing filter can achieve the transformation of zero point polarity by changing the opening direction of the ridge line, changing the opening direction of the ridge line is equivalent to forming a new coupling structure, which is difficult and costly to process, resulting in a high cost for achieving the transformation of zero point polarity. Summary of the invention

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

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a filter, comprising a cavity body provided with a resonant cavity and a cover plate buckled on the cavity, wherein a resonant rod is installed in the resonant cavity to form a resonator, and the resonator comprises: Metal resonator; A first dielectric resonator, forming a first window with the metal resonator and coupling with the metal resonator through the first window; a second dielectric resonator, forming a second window with the metal resonator and a third window with the first dielectric resonator, the second dielectric resonator being coupled to the metal resonator through the second window and being coupled to the first dielectric resonator through the third window; a connecting cavity, disposed on the metal resonator and connecting the first window and the second window; and The partition ribs are arranged in the connecting cavity to separate the connecting cavity.

[0007] In some embodiments, a step is provided in the resonant cavity of the metal resonator, and the connecting cavity is opened on the step.

[0008] In some embodiments, an intermediate column is formed between the metal resonator, the first dielectric resonator, and the second dielectric resonator, and two ends of the partition rib are respectively connected to the intermediate column and the step.

[0009] In some embodiments, the first window is provided with a first ridge line, wherein the first ridge line connects the intermediate columns.

[0010] In some embodiments, the second window is provided with a second ridge line, and the second window is formed between the second ridge line and the middle column.

[0011] In some embodiments, the height of the ribs is the same as the height of the steps.

[0012] In a second aspect, the present invention further provides a filter zero point polarity conversion method, comprising the following steps: The waveguide is input into the filter from the waveguide input end and output from the waveguide output end, and the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide output end generate a zero point; The ribs are removed to change the zero point polarity generated by the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the output end of the waveguide.

[0013] In some embodiments, in the step of inputting the waveguide into the filter from the waveguide input end and outputting from the waveguide output end, the waveguide is input into the metal resonator from the waveguide input end and outputted through the waveguide output end connected to the first dielectric resonator or the second dielectric resonator, and the polarity of the zero point 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 ribs and changing the zero point polarity, the zero point polarity generated by the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the output end of the waveguide is changed to positive.

[0014] In some embodiments, in the step of inputting the waveguide into the filter from the waveguide input end and outputting from the waveguide output end, the waveguide is input into the first dielectric resonator or the second dielectric resonator connected to the waveguide input end, and is output through the waveguide output end connected to the metal resonator, and 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; In the step of removing the ribs and changing the zero point polarity, the zero point polarity generated by the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide input end is changed to negative.

[0015] Compared with the prior art, the filter provided by the present invention is provided with a metal resonator, a first dielectric resonator and a second dielectric resonator. 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 is coupled to the first dielectric resonator through a third window. A connecting cavity separated by a partition rib is formed between the first window and the second window. When the structure is used as a filter to perform waveguide transmission, the waveguide is input into the filter from the waveguide input end and output from the waveguide output end. The metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide output end generate a zero point. By removing the partition rib of the connecting cavity, the zero point polarity of the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide output end can be changed, thereby reducing the difficulty of changing the zero point polarity and reducing the cost of changing the zero point polarity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the structure of a filter provided by an embodiment of the present invention; Figure 2 yes Figure 1 Response plot of mid-bandpass zero; Figure 3 It is a schematic diagram of the structure of the filter provided by an embodiment of the present invention without the partition bars; Figure 4 yes Figure 3 Response plot of mid-bandpass zero; Figure 5 is a schematic diagram of the structure of a filter provided by a first embodiment of the present invention; Figure 6 is a schematic structural diagram of a filter provided by a second embodiment of the present invention; Figure 7 is a schematic diagram of the structure of a filter provided by a third embodiment of the present invention; Figure 8 is a schematic structural diagram of a filter provided by a fourth embodiment of the present invention; Fig. 9 It is a flow chart of a filter zero point polarity conversion method provided by an embodiment of the present invention.

[0017] Reference numerals in the figures: 10—metal resonator 11—first window 12—second window 13—step 20—first dielectric resonator 30—second dielectric resonator 31—third window 40—connecting cavity 50—partition rib 60—middle column 70—waveguide input end 80—waveguide output end 111 —first ridge line 121 —second ridge line. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problem of high cost of filter zero point polarity conversion in the prior art, an embodiment of the present invention provides a filter and a filter zero point polarity conversion method to reduce the conversion difficulty and conversion cost of the filter zero point polarity.

[0020] The filter provided by the embodiment of the present invention is as follows: Figure 1 and 5 -8, comprising a cavity body provided with a resonant cavity and a cover plate snapped onto the cavity body, wherein a resonant rod is installed in the resonant cavity to form a resonator, and the resonator comprises a metal resonator 10, a first dielectric resonator 20, a second dielectric resonator 30, a connecting cavity 40 and a partition rib 50, a first window 11 is formed between the first dielectric resonator 20 and the metal resonator 10, and the first dielectric resonator 10 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 is coupled to the first dielectric resonator 20 through the third window 31; the connecting cavity 40 is arranged on the metal resonator 10 and connects the first window 11 and the second window 12; the partition rib 50 is arranged on the connecting cavity 40 to separate the connecting cavity 40.

[0021] Specifically, by setting 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 coupled to each other to form a hybrid filtering structure.

[0022] like Figure 1 As shown, a connection cavity 40 separated by a partition rib 50 is formed between the first window 11 and the second window 12. When the structure is used as a filter to perform waveguide transmission, the waveguide is input into the filter from the waveguide input end 70 and output from the waveguide output end 80. The metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output end 80 generate zero points. Figure 2 It can be seen from the bandpass zero-point response diagram that when the rib 50 is present, the zero point a is formed on the left side of the bandpass region.

[0023] After removing 50% of the reinforcement, the Figure 3 The zero point polarity transformation structure shown in Figure 4 It can be seen from the bandpass zero point response diagram that after the rib 50 is removed, the 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.

[0024] Therefore, by removing the partition 50 of the connecting cavity 40, the zero point polarity of the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output end 80 can be changed, thereby reducing the difficulty of changing the zero point polarity and reducing the cost of changing the zero point polarity.

[0025] In this embodiment, the zero-point polarity transformation structure can input the waveguide through the metal resonator 10 and output the waveguide through the first dielectric resonator 20 or the second dielectric resonator 30, or input the waveguide through the first dielectric resonator 20 or the second dielectric resonator 30 and output the waveguide through the metal resonator 10. When the metal resonator 10 is used for waveguide input through the above structure, the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 for polar waveguide input form a negative polarity zero point. When the rib 50 is removed, the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 for waveguide output are transformed into positive polarity. When the first dielectric resonator 20 or the second dielectric resonator 30 is used for waveguide input, the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 for waveguide input form a positive polarity zero point. When the rib 50 is removed, the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 for waveguide input are transformed into negative polarity.

[0026] In this embodiment, the first dielectric resonator 20 and the second dielectric resonator 30 are TE mode dielectric filters.

[0027] In one embodiment, if Figure 1 , 3 As shown in FIGS. 5-8 , a step 13 is provided in the resonant cavity of the metal resonator 10, and the connecting cavity 40 is opened at 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.

[0028] In one embodiment, the height of the ribs 50 is the same as the height of the step 13. Specifically, by setting the height of the ribs 50 to be the same as the height of the step 13, it is only necessary to form a groove structure by processing the step 13 close to the first window 11 and the second window 12, so as to form a connecting cavity 40 structure with the ribs 50, which facilitates the molding of the filter.

[0029] In one embodiment, if Figure 1 , 3 As shown in 5-8, an intermediate column 60 is formed between the metal resonator 10, the first dielectric resonator 20 and the second dielectric resonator 30, and two ends of the partition rib 50 are connected to the intermediate column 60 and the step 13 respectively.

[0030] In one embodiment, if Figure 1 , 3 As shown in FIGS. 5-8 , the first window 11 is provided with a first ridge line 111, and the first ridge line 111 is connected to the middle column 60. Specifically, by providing the first ridge line 111, a T-type 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 a 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 line 111 or adjusting the position of the first ridge line 111 so that the first ridge line 111 is spaced from the middle column 60.

[0031] In one embodiment, if Figure 1 , 3As shown in FIGS. 5-8 , the second window 12 is provided with a second ridge line 121, and the second window 12 is formed between the second ridge line 121 and the middle column 60. Specifically, by providing the second ridge line 121, a T-type 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 line 121 or adjusting the position of the second ridge line 121 so that the second ridge line 121 is spaced apart from the middle column 60.

[0032] The filter of the embodiment of the present invention further comprises a waveguide input end 70, a waveguide output end 80 and the filter, wherein the waveguide input end 70 is connected to the metal resonator 10, and the waveguide output end 80 is connected to the first dielectric resonator 20 or the second dielectric resonator 30, or the waveguide input end 70 is connected to the first dielectric resonator 20 or the second dielectric resonator 30, and the waveguide output end 80 is connected to the metal resonator 10. Specifically, by setting the above-mentioned zero-point polarity conversion structure, when the zero-point polarity of the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 needs to be converted, it is only necessary to remove the partition rib 50 of the connecting rib, thereby reducing the difficulty of converting the zero-point polarity of the filter and reducing the conversion cost of the zero-point polarity.

[0033] In the first embodiment, if Figure 5 As shown, the waveguide input end 70 is connected to the metal resonator 10, and the waveguide output end 80 is connected to the first dielectric resonator 20. The zero point polarity formed by the metal resonator 10 and the first dielectric resonator 20 is negative. By removing the partition rib 50, the zero point polarity formed by the metal resonator 10 and the first dielectric resonator 20 can be transformed into positive.

[0034] In the second embodiment, if Figure 6 As shown, the waveguide input end 70 is connected to the metal resonator 10, and the waveguide output end 80 is connected to the second dielectric resonator 30. The zero point polarity formed by the metal resonator 10 and the second dielectric resonator 30 is negative. By removing the partition rib 50, the zero point polarity formed by the metal resonator 10 and the second dielectric resonator 30 can be transformed into positive.

[0035] In the third embodiment, if Figure 7 As shown, the waveguide output end 80 is connected to the metal resonator 10, and the waveguide input end 70 is connected to the first dielectric resonator 20. The zero point polarity formed by the metal resonator 10 and the first dielectric resonator 20 is positive. By removing the partition rib 50, the zero point polarity formed by the metal resonator 10 and the first dielectric resonator 20 can be transformed into negative.

[0036] In the fourth embodiment, if Figure 8As shown, the waveguide output end 80 is connected to the metal resonator 10, and the waveguide input end 70 is connected to the second dielectric resonator 30. The zero point polarity formed by the metal resonator 10 and the second dielectric resonator 30 is negative. By removing the partition rib 50, the zero point polarity formed by the metal resonator 10 and the second dielectric resonator 30 can be transformed into positive.

[0037] The embodiment of the present invention also provides a filter zero point polarity conversion method, such as Fig. 9 As shown, the following steps are included: The waveguide is input into the filter from the waveguide input end 70 and output from the waveguide output end 80, and the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output end 80 generate a zero point; The ribs 50 are removed, and the polarity of the zero points generated by the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output end 80 is changed.

[0038] Specifically, through the above-mentioned conversion steps of the zero point polarity of the filter, the conversion difficulty of the zero point polarity of the filter can be effectively reduced, and the conversion cost of the zero point polarity can be reduced.

[0039] In one embodiment, in the step of inputting the waveguide into the filter from the waveguide input end 70 and outputting from the waveguide output end 80, the waveguide is input into the metal resonator 10 from the waveguide input end 70 and outputted through the waveguide output end 80 connected to the first dielectric resonator 20 or the second dielectric resonator 30, and the polarity of the zero point generated by the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output end 80 is negative; In the step of removing the ribs 50 and changing the zero point polarity, 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 end 80 is changed to positive.

[0040] In one embodiment, in the step of inputting the waveguide into the filter from the waveguide input end 70 and outputting from the waveguide output end 80, the waveguide is input into the first dielectric resonator 20 or the second dielectric resonator 30 connected from the waveguide input end 70, and is output through the waveguide output end 80 connected to the metal resonator 10, and the polarity of the zero point generated by the metal resonator 10 and the first dielectric resonator 20 or the second dielectric resonator 30 connected to the waveguide output end 80 is positive; In the step of removing the ribs 50 and changing the zero point polarity, 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 input end 70 is changed to negative.

[0041] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A filter, comprising a cavity with a resonant cavity and a cover plate buckled on the cavity, wherein a resonant rod is installed in the resonant cavity to form a resonator, characterized in that: include: Metal resonator; A first dielectric resonator, forming a first window with the metal resonator and coupling with the metal resonator through the first window; a second dielectric resonator, forming a second window with the metal resonator and a third window with the first dielectric resonator, the second dielectric resonator being coupled to the metal resonator through the second window and being coupled to the first dielectric resonator through the third window; A connecting cavity, disposed on the metal resonator and connecting the first window and the second window; and The partition ribs are arranged in the connecting cavity.

2. The filter according to claim 1, characterized in that A step is arranged in the resonant cavity of the metal resonator, 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 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, and the first ridge line connects the middle 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 middle column.

6. The filter according to claim 2, characterized in that The height of the partition ribs is the same as the height of the steps.

7. A filter zero point polarity conversion method, characterized in that: The following steps are involved: The waveguide is input into the filter from the waveguide input end and output from the waveguide output end, and the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide output end generate a zero point; The ribs are removed to change the zero point polarity generated by the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the output end of the waveguide.

8. The filter zero point polarity conversion method according to claim 7, characterized in that: In the step of inputting the waveguide into the filter from the waveguide input end and outputting from the waveguide output end, the waveguide is input into the metal resonator from the waveguide input end and outputted through the waveguide output end connected to the first dielectric resonator or the second dielectric resonator, and the polarity of the zero point 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 ribs and changing the zero point polarity, the zero point polarity generated by the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the output end of the waveguide is changed to positive.

9. The filter zero point polarity conversion method according to claim 8, characterized in that: In the step of inputting the waveguide into the filter from the waveguide input end and outputting from the waveguide output end, the waveguide is input into the first dielectric resonator or the second dielectric resonator connected to the waveguide input end, and is output through the waveguide output end connected to the metal resonator, and 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; In the step of removing the ribs and changing the zero point polarity, the zero point polarity generated by the metal resonator and the first dielectric resonator or the second dielectric resonator connected to the waveguide input end is changed to negative.

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