CN110676544A - Dielectric waveguide filter with capacitive coupling structure - Google Patents
Dielectric waveguide filter with capacitive coupling structure Download PDFInfo
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- CN110676544A CN110676544A CN201911070681.8A CN201911070681A CN110676544A CN 110676544 A CN110676544 A CN 110676544A CN 201911070681 A CN201911070681 A CN 201911070681A CN 110676544 A CN110676544 A CN 110676544A
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- dielectric block
- ceramic dielectric
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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
- H01P1/2002—Dielectric waveguide filters
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Abstract
A dielectric waveguide filter with a capacitive coupling structure includes a ceramic dielectric block; the top surface of the ceramic dielectric block is provided with four sunken resonant tanks; a first window penetrates through the middle of the ceramic dielectric block, and a second window is formed along the center line of the ceramic dielectric block and close to one side edge of the ceramic dielectric block; a first step groove is concavely arranged on the top surface of the ceramic dielectric block between the first window and the second window; two shallow blind holes are formed in the bottom surface of the ceramic dielectric block between the two resonant grooves and are symmetrically distributed on two sides of the first stepped groove; and a second stepped groove is concavely arranged on the bottom surface of the ceramic dielectric block between the two shallow blind holes, and third conducting layers are arranged on the bottom surface of the second stepped groove, the bottom surfaces of the shallow blind holes and the circumferential side wall. Thus, the resonance outside the zero point can be eliminated within the size range of the ceramic dielectric block, and the performance can be improved.
Description
Technical Field
The invention relates to the technical field of 5G communication antennas, in particular to a dielectric waveguide filter with a capacitive coupling structure.
Background
With the development of communication technology, the 5 th generation communication system is going to be commercially available. The characteristics of low time delay and high bandwidth of the 5G communication system provide a better platform for people's life and the application of the Internet of things. The 5G communication system improves signal coverage by introducing an active antenna array (the number of cooperative antennas on the base station side can support up to 128), and 128 filters are connected behind each antenna, which puts requirements on miniaturization of the filters. The high dielectric and low loss characteristics of the dielectric ceramic filter are very suitable for being applied to a 5G communication system. Compared with the traditional metal filter, the volume of the dielectric ceramic filter can be reduced to about 1/5.
The existing dielectric waveguide filter is provided with a plurality of resonators, two blind holes are arranged between the resonators on the left side and the right side, and the blind holes form blind hole capacitors which are used for forming two symmetrical zero points Q on two sides of main frequency on a frequency spectrum, but the blind hole capacitors can generate unwanted resonance on the outer sides of the zero points Q, and the unwanted resonance can be generated in the size range of the dielectric waveguide filter, interfere signals of the filter and reduce the performance of the filter, as shown in fig. 4.
Disclosure of Invention
In view of the above, the present invention provides a dielectric waveguide filter having a capacitive coupling structure, which can eliminate resonance outside the zero point and within the size range of the ceramic dielectric block, and improve performance, so as to solve the above problems.
A dielectric waveguide filter with a capacitive coupling structure includes a ceramic dielectric block; the top surface of the ceramic dielectric block is provided with four sunken resonant tanks; a first window penetrates through the middle of the ceramic dielectric block, and a second window is formed along the center line of the ceramic dielectric block and close to one side edge of the ceramic dielectric block; a first step groove is concavely arranged on the top surface of the ceramic dielectric block between the first window and the second window; two shallow blind holes are formed in the bottom surface of the ceramic dielectric block between the two resonant grooves and are symmetrically distributed on two sides of the first stepped groove; and a second stepped groove is concavely arranged on the bottom surface of the ceramic dielectric block between the two shallow blind holes, and third conducting layers are arranged on the bottom surface of the second stepped groove, the bottom surfaces of the shallow blind holes and the circumferential side wall.
Further, the top surface or the bottom surface of the ceramic dielectric block is rectangular or square.
Further, the first window is in a cross shape.
Further, the second window is circular in shape.
Further, the depth of the first step groove is greater than the depth of the resonance groove.
Compared with the prior art, the dielectric waveguide filter with the capacitive coupling structure comprises a ceramic dielectric block; the top surface of the ceramic dielectric block is provided with four sunken resonant tanks; a first window penetrates through the middle of the ceramic dielectric block, and a second window is formed along the center line of the ceramic dielectric block and close to one side edge of the ceramic dielectric block; a first step groove is concavely arranged on the top surface of the ceramic dielectric block between the first window and the second window; two shallow blind holes are formed in the bottom surface of the ceramic dielectric block between the two resonant grooves and are symmetrically distributed on two sides of the first stepped groove; and a second stepped groove is concavely arranged on the bottom surface of the ceramic dielectric block between the two shallow blind holes, and third conducting layers are arranged on the bottom surface of the second stepped groove, the bottom surfaces of the shallow blind holes and the circumferential side wall. Thus, resonance outside the zero point can be eliminated, and performance can be improved.
Drawings
Embodiments of the invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a perspective view of a dielectric waveguide filter with a capacitive coupling structure according to a first aspect of the present invention.
Fig. 2 is a perspective view of a dielectric waveguide filter with a capacitive coupling structure according to a second aspect of the present invention.
Fig. 3 is a side sectional view of a dielectric waveguide filter having a capacitive coupling structure according to the present invention.
Fig. 4 is a schematic diagram showing a spectral simulation of a conventional dielectric waveguide filter.
Fig. 5 is a schematic diagram of a frequency spectrum simulation of the dielectric waveguide filter with the capacitive coupling structure provided by the invention.
Detailed Description
Specific embodiments of the present invention will be described in further detail below based on the drawings. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
Referring to fig. 1, the dielectric waveguide filter with a capacitive coupling structure according to the present invention includes a ceramic dielectric block 10.
The ceramic dielectric block 10 has a sheet structure, and the top surface or the bottom surface is rectangular or square.
The peripheral surface of the ceramic dielectric block 10 is plated with a first conductive layer.
Four sunken resonant grooves 20 are formed in the top surface of the ceramic dielectric block 10, and the resonant grooves 20 do not penetrate through the ceramic dielectric block 10. The inner surface of the resonance tank 20 is plated with a second conductive layer to function as a resonator.
A first window 51 is arranged in the middle of the ceramic dielectric block 10 in a penetrating manner, and a second window 52 is arranged along the center line of the ceramic dielectric block 10 and close to one side edge of the ceramic dielectric block 10. In the present embodiment, the first window 51 has a cross shape, and the second window 52 has a circular shape. A first step groove 60 is concavely arranged on the top surface of the ceramic dielectric block 10 between the first window 51 and the second window 52, a first end of the first step groove 60 is communicated with the first window 51, and a second end is communicated with the second window 52.
Referring to fig. 2, two shallow blind holes 30 are formed in the bottom surface of the ceramic dielectric block 10 between the two resonant grooves 20, and the two shallow blind holes 30 are symmetrically distributed on two sides of the first step groove 60.
And a second step groove 40 is concavely arranged on the bottom surface of the ceramic dielectric block 10 between the two shallow blind holes 30.
Referring to fig. 3, the depth of the first step groove 60 is greater than that of the resonant groove 20, the bottom surface of the second step groove 40, the bottom surface of the shallow blind hole 30 and the circumferential side wall are all provided with a third conductive layer 70, and the third conductive layer 70 is attached to the bottom surface of the second step groove 40, the bottom surface of the shallow blind hole 30 and the circumferential side wall by electroplating.
Referring to fig. 5, a capacitor is formed between the third conductive layer 70 and the second conductive layer, and simultaneously, the third conductive layer is matched with the opposite first step groove 60, so that the inductive coupling between the shallow blind holes 30 can be weakened, the length of the formed capacitor is very small and smaller than 1/2 wavelengths, the redundant resonance frequency of the capacitor with the structure is far from the two sides of the main frequency and is not in the size range of the ceramic dielectric block, the redundant resonance generated at the near position of the two sides of the main frequency is avoided, and the interference to the main frequency is reduced. The resulting spectrogram is shown in fig. 5, with the abscissa FR representing frequency and the ordinate MA representing amplitude.
Compared with the prior art, the dielectric waveguide filter with the capacitive coupling structure comprises a ceramic dielectric block 10; the top surface of the ceramic dielectric block 10 is provided with four sunken resonant grooves 20; a first window 51 is arranged in the middle of the ceramic dielectric block 10 in a penetrating manner, and a second window 52 is arranged along the center line of the ceramic dielectric block 10 and close to one side edge of the ceramic dielectric block 10; a first step groove 60 is concavely arranged on the top surface of the ceramic dielectric block 10 between the first window 51 and the second window 52; two shallow blind holes 30 are formed in the bottom surface of the ceramic dielectric block 10 between the two resonant grooves 20, and the two shallow blind holes 30 are symmetrically distributed on two sides of the first stepped groove 60; a second step groove 40 is concavely arranged on the bottom surface of the ceramic dielectric block 10 between the two shallow blind holes 30, and third conductive layers 70 are respectively arranged on the bottom surface of the second step groove 40, the bottom surface of the shallow blind hole 30 and the circumferential side wall. Thus, resonance outside the zero point can be eliminated, and performance can be improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.
Claims (5)
1. A dielectric waveguide filter having a capacitive coupling structure, characterized by: comprises a ceramic dielectric block; the top surface of the ceramic dielectric block is provided with four sunken resonant tanks; a first window penetrates through the middle of the ceramic dielectric block, and a second window is formed along the center line of the ceramic dielectric block and close to one side edge of the ceramic dielectric block; a first step groove is concavely arranged on the top surface of the ceramic dielectric block between the first window and the second window; two shallow blind holes are formed in the bottom surface of the ceramic dielectric block between the two resonant grooves and are symmetrically distributed on two sides of the first stepped groove; and a second stepped groove is concavely arranged on the bottom surface of the ceramic dielectric block between the two shallow blind holes, and third conducting layers are arranged on the bottom surface of the second stepped groove, the bottom surfaces of the shallow blind holes and the circumferential side wall.
2. A dielectric waveguide filter having a capacitive coupling structure according to claim 1, wherein: the top surface or the bottom surface of the ceramic dielectric block is rectangular or square.
3. A dielectric waveguide filter having a capacitive coupling structure according to claim 1, wherein: the first window is in a cross shape.
4. A dielectric waveguide filter having a capacitive coupling structure according to claim 1, wherein: the second window is circular in shape.
5. A dielectric waveguide filter having a capacitive coupling structure according to claim 1, wherein: the depth of the first step groove is greater than that of the resonance groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911070681.8A CN110676544A (en) | 2019-11-05 | 2019-11-05 | Dielectric waveguide filter with capacitive coupling structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911070681.8A CN110676544A (en) | 2019-11-05 | 2019-11-05 | Dielectric waveguide filter with capacitive coupling structure |
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| CN110676544A true CN110676544A (en) | 2020-01-10 |
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| CN201911070681.8A Pending CN110676544A (en) | 2019-11-05 | 2019-11-05 | Dielectric waveguide filter with capacitive coupling structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682291A (en) * | 2020-07-24 | 2020-09-18 | 中国电子科技集团公司第二十六研究所 | Dielectric filter coupling conversion structure and communication equipment |
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2019
- 2019-11-05 CN CN201911070681.8A patent/CN110676544A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682291A (en) * | 2020-07-24 | 2020-09-18 | 中国电子科技集团公司第二十六研究所 | Dielectric filter coupling conversion structure and communication equipment |
| CN111682291B (en) * | 2020-07-24 | 2024-03-12 | 中国电子科技集团公司第二十六研究所 | Medium filter coupling conversion structure and communication equipment |
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