CN111403858A - Zero point implementation structure of ceramic waveguide band-pass filter - Google Patents
Zero point implementation structure of ceramic waveguide band-pass filter Download PDFInfo
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- CN111403858A CN111403858A CN202010190087.9A CN202010190087A CN111403858A CN 111403858 A CN111403858 A CN 111403858A CN 202010190087 A CN202010190087 A CN 202010190087A CN 111403858 A CN111403858 A CN 111403858A
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- shielding layer
- hole
- ceramic waveguide
- zero point
- pass filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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Abstract
The invention provides a zero point realization structure of a ceramic waveguide band-pass filter, which comprises four or more than four resonant cavities, wherein the resonant cavities are separated by a plurality of isolating through grooves, the structure also comprises one or more through holes, the through holes are arranged between any two resonant cavities, a first non-shielding layer area is arranged on the inner wall of the lower end of each through hole, which accounts for one third of the depth of the whole through hole, a second non-shielding layer area which surrounds the lower end surface of each through hole for one circle is arranged on the lower surface of the structure, and a metal layer is covered on the surface of the structure except the first non-shielding layer area and the second non-shielding layer area. The invention solves the problems of lower anti-interference capability and higher energy loss in the prior art.
Description
Technical Field
The invention relates to the technical field of band-pass filters, in particular to a zero point implementation structure of a ceramic waveguide band-pass filter.
Background
With the rapid layout development of the 5G technology, a miniaturized passive device filter becomes the mainstream, and the industry development trend is realized through small space, small volume, low loss and high inhibition. The existing filter has low anti-interference capability to other communication frequency bands, and the energy loss of the filter is large.
Disclosure of Invention
The invention provides a zero point implementation structure of a ceramic waveguide band-pass filter, which aims to solve the problems of low anti-interference capability and high energy loss in the prior art.
In order to solve the technical problems, the invention provides a zero point implementation structure of a ceramic waveguide band-pass filter, which comprises four or more than four resonant cavities, wherein the resonant cavities are separated by a plurality of isolating through grooves, the zero point implementation structure further comprises one or more through holes, the through holes are arranged between any two resonant cavities, a first non-shielding layer area is arranged on the inner wall of the lower end of each through hole, which accounts for one third of the depth of the whole through hole, a second non-shielding layer area surrounding the lower end face of each through hole in a circle is arranged on the lower surface of the structure, and a metal covering layer is arranged on the surface of the structure except the first non-shielding layer area and the second.
And the resonant cavity is provided with a tuning frequency blind hole.
The surface of the structure is covered with the metal layer in a chemical plating, spraying and immersion plating mode.
The metal covered on the surface of the structure is gold or silver or copper.
And removing the foreign metal impurities on the surfaces of the first non-shielding layer region and the second non-shielding layer region by using laser etching.
And the width of the non-shielding layer region II is 0.2mm-2 mm.
The invention has the following beneficial effects: compared with the prior art, the zero-point realization structure of the ceramic waveguide band-pass filter comprises more than 4 resonant cavities to form the band-pass filter, the zero-point structure is formed by one or more through holes between any two resonant cavities, and a pair of symmetrical or asymmetrical zero points can be generated by adding one zero-point structure, so that the out-of-band rejection of the filter can be improved, the anti-interference capability to other communication frequency bands can be improved, and the loss can be reduced.
Drawings
FIG. 1 is a top view of a zero-point implementation structure of a ceramic waveguide band-pass filter according to an embodiment of the invention
FIG. 2 is a cross-sectional view of the step at A-A in FIG. 1
FIG. 3 is a bottom view of a zero-point implementation structure of a ceramic waveguide band-pass filter according to an embodiment of the invention
FIG. 4 is an S-parameter curve of a zero-point implementation structure of a ceramic waveguide band-pass filter according to an embodiment of the present invention
FIG. 5 is a top view of a zero-point implementation structure of a ceramic waveguide band-pass filter according to a second embodiment of the invention
FIG. 6 is a cross-sectional view of the step at B-B in FIG. 5
FIG. 7 is a bottom view of a zero-point implementation structure of a ceramic waveguide bandpass filter according to a second embodiment of the invention
The frequency tuning structure comprises a resonant cavity 1, an isolation through groove 2, a through hole 3, a shielding layer-free region I4, a shielding layer-free region II 5 and a frequency tuning blind hole 6.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
Example one
As shown in fig. 1 to 4, the present invention provides a zero point implementation structure of a ceramic waveguide band-pass filter, including six resonant cavities 1, the six resonant cavities 1 are separated by two isolation through grooves 2, and further including a circular through hole 3, the through hole 3 is disposed between the two resonant cavities 1, a first non-shielding layer area 4 is disposed on an inner wall of the lower end of the through hole 3, which occupies one third of the depth of the through hole 3, a second non-shielding layer area 5 surrounding the lower end face of the through hole 3 for a circle is disposed on the lower surface of the structure, and a metal layer is covered on the surface of the structure except the first non-shielding layer area 4 and the second non-shielding layer area 5.
Further, a tuning frequency blind hole 6 is formed in the resonant cavity 1.
Furthermore, the surface of the structure is covered with the metal layer by means of chemical plating, spraying and immersion plating.
Further, the metal covered on the surface of the structure is gold or silver or copper.
Furthermore, the foreign metal impurities on the surfaces of the non-shielding layer area I4 and the non-shielding layer area II 5 are removed by laser etching.
Further, the width of the non-shielding layer region two 5 is 0.2mm-2 mm.
Example two
As shown in fig. 5 to 7, the invention provides a zero point implementation structure of a ceramic waveguide band-pass filter, which includes six resonant cavities 1, the six resonant cavities 1 are separated by two isolation through grooves 2, and the zero point implementation structure further includes a square through hole 3, the through hole 3 is disposed between the two resonant cavities 1, a first non-shielding layer area 4 is disposed on an inner wall of the lower end of the through hole 3, which occupies one third of the depth of the whole through hole 3, a second non-shielding layer area 5 surrounding the lower end face of the through hole 3 for one circle is disposed on the lower surface of the structure, and a metal layer covers the surface of the structure except the first non-shielding layer area 4 and the second non-.
Further, a tuning frequency blind hole 6 is formed on the resonant cavity 1.
Furthermore, the surface of the structure is covered with the metal layer by means of chemical plating, spraying and immersion plating.
Further, the metal covered on the surface of the structure is gold or silver or copper.
Furthermore, the foreign metal impurities on the surfaces of the non-shielding layer area I4 and the non-shielding layer area II 5 are removed by laser etching.
Further, the width of the non-shielding layer region two 5 is 0.2mm-2 mm.
The filter generates negative coupling through the rotating electromagnetic field and enables electromagnetic signals to pass through, so that the filter can generate left and right zero points, the out-of-band rejection of the filter can be improved, the anti-interference capability of the filter on other communication frequency bands is improved, and the loss is reduced.
The shape of the through hole 3 may be rectangular, polygonal or other shapes, which are not limited in this embodiment.
In summary, the zero point implementation structure of the ceramic waveguide band-pass filter of the present invention is a band-pass filter composed of more than 4 resonant cavities, the zero point structure is formed by one or more through holes between any two resonant cavities, and a pair of symmetrical or asymmetrical zero points can be generated when adding one zero point structure, so that the out-of-band rejection of the filter can be improved, the anti-interference capability to other communication frequency bands can be increased, and the loss can be reduced.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a ceramic waveguide band-pass filter zero point realizes structure, includes four or four above resonant cavities (1), separate its characterized in that through groove (2) of a plurality of isolation between a plurality of resonant cavities (1): still including one or more through-hole (3), through-hole (3) set up between arbitrary two resonant cavities (1) through-hole (3) lower extreme account for and set up on the inner wall of whole through-hole (3) degree of depth third and do not have shielding layer region one (4) be provided with on the lower surface of structure around through-hole (3) terminal surface a week do not have shielding layer region two (5) the surface covering metal level of non-shielding layer region one (4), no shielding layer region two (5) is detached to the structure.
2. The ceramic waveguide band-pass filter zero point realization structure of claim 1, characterized in that the resonant cavity (1) is provided with a frequency tuning blind hole (6).
3. The zero implementation structure of a ceramic waveguide bandpass filter according to claim 1, wherein the surface of the structure is coated with a metal layer by electroless plating, spray coating or immersion plating.
4. The ceramic waveguide bandpass filter zero point implementation structure of claim 1 wherein the metal covering the surface of the structure is gold or silver or copper.
5. The zero point realization structure of bandpass filter of ceramic waveguide as claimed in claim 1, wherein the foreign metal impurities on the surface of the first (4) and second (5) non-shielding layer regions are removed by laser etching.
6. The zero implementation structure of a ceramic waveguide bandpass filter according to claim 1, wherein the width of the non-shielding layer region two (5) is 0.2mm to 2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010190087.9A CN111403858A (en) | 2020-03-18 | 2020-03-18 | Zero point implementation structure of ceramic waveguide band-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010190087.9A CN111403858A (en) | 2020-03-18 | 2020-03-18 | Zero point implementation structure of ceramic waveguide band-pass filter |
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| Publication Number | Publication Date |
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| CN111403858A true CN111403858A (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010190087.9A Pending CN111403858A (en) | 2020-03-18 | 2020-03-18 | Zero point implementation structure of ceramic waveguide band-pass filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022203567A1 (en) * | 2021-03-24 | 2022-09-29 | Telefonaktiebolaget Lm Ericsson (Publ) | Port coupling for wide band ceramic waveguide filter unit |
-
2020
- 2020-03-18 CN CN202010190087.9A patent/CN111403858A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022203567A1 (en) * | 2021-03-24 | 2022-09-29 | Telefonaktiebolaget Lm Ericsson (Publ) | Port coupling for wide band ceramic waveguide filter unit |
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