CN112397856B - Dielectric filter coupling structure with capacitive coupling characteristic - Google Patents
Dielectric filter coupling structure with capacitive coupling characteristic Download PDFInfo
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- CN112397856B CN112397856B CN201910746564.2A CN201910746564A CN112397856B CN 112397856 B CN112397856 B CN 112397856B CN 201910746564 A CN201910746564 A CN 201910746564A CN 112397856 B CN112397856 B CN 112397856B
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
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Abstract
The invention relates to the technical field of dielectric filter coupling structures, in particular to a dielectric filter coupling structure with capacitive coupling characteristics, which comprises a dielectric filter, wherein the dielectric filter comprises a first dielectric resonator, a second dielectric resonator, an S-shaped through groove capacitive coupling structure and a coupling window, the S-shaped through groove capacitive coupling structure comprises an upper blind hole and a lower blind hole which are staggered, a first resonant hole corresponding to the upper blind hole is arranged in the middle of the first dielectric resonator, a second resonant hole corresponding to the lower blind hole is arranged in the middle of the second dielectric resonator, and an open window is reserved between the upper blind hole and the lower blind hole. The invention realizes the phase reversal of the magnetic field by introducing the S-shaped through groove, so that the coupling characteristic between the two dielectric resonators is changed from inductive to capacitive.
Description
Technical Field
The invention relates to the technical field of dielectric filter coupling structures, in particular to a dielectric filter coupling structure with capacitive coupling characteristics.
Background
Dielectric filters have been difficult to implement for capacitive coupling as an important component in communication systems. The previous solution, which achieves capacitive coupling by means of deep blind vias with a depth exceeding that of the dielectric block 1/2, has the disadvantage of generating harmonics at the low end of the filter passband, reducing the rejection capability of the filter. To this end, we propose a dielectric filter coupling structure with capacitive coupling characteristics.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a dielectric filter coupling structure with capacitive coupling characteristics.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dielectric filter coupling structure with capacitive coupling characteristics is designed, and comprises a dielectric filter, wherein the dielectric filter comprises a first dielectric resonator, a second dielectric resonator, an S-shaped through groove capacitive coupling structure and a coupling window, the S-shaped through groove capacitive coupling structure is arranged at the joint of the middle parts of the first dielectric resonator and the second dielectric resonator, the coupling window is symmetrically arranged on two sides of the joint of the first dielectric resonator and the second dielectric resonator, a center line mark is arranged on the coupling window, the S-shaped through groove capacitive coupling structure comprises an upper blind hole and a lower blind hole which are staggered, a first resonant hole corresponding to the upper blind hole is arranged in the middle part of the first dielectric resonator, a second resonant hole corresponding to the lower blind hole is arranged in the middle part of the second dielectric resonator, and an open window is reserved between the upper blind hole and the lower blind hole.
Preferably, the cross section of the upper blind hole and the lower blind hole is one of a circle, a square and a polygon.
Preferably, the cross section size and depth of the upper blind hole and the lower blind hole are different.
Preferably, the dielectric filter is integrated, the dielectric filter includes a third resonance hole, a fourth resonance hole, a fifth resonance hole, a sixth resonance hole, a seventh resonance hole, and an eighth resonance hole, and the third resonance hole, the fourth resonance hole, the fifth resonance hole, the sixth resonance hole, the seventh resonance hole, and the eighth resonance hole correspond to each other in pairs along a vertical cross section of the dielectric filter, the middle of the dielectric filter is provided with a capacitive coupling structure, and the left side and the right side of the dielectric filter are respectively and correspondingly provided with a first transmission zero point and a second transmission zero point.
The dielectric filter coupling structure with the capacitive coupling characteristic has the advantages that: the invention realizes the phase reversal of the magnetic field by introducing the S-shaped through groove, so that the coupling characteristic between the two dielectric resonators is changed from inductive to capacitive.
Drawings
Fig. 1 is a schematic diagram of a coupling structure of a dielectric filter with capacitive coupling characteristics according to the present invention;
fig. 2 is a schematic front view of a coupling structure of a dielectric filter with capacitive coupling characteristics according to the present invention;
fig. 3 is a schematic top view of a dielectric filter coupling structure with capacitive coupling characteristics according to the present invention;
fig. 4 is a schematic diagram of a coupling structure of a dielectric filter with capacitive coupling characteristics according to the present invention;
fig. 5 is a schematic frequency response curve of a dielectric filter coupling structure with capacitive coupling characteristics according to the present invention;
in the figure: the capacitive coupling structure comprises a first dielectric resonator 1, a second dielectric resonator 2, an S-shaped through groove capacitive coupling structure 3, a coupling window 4, a center line mark 5, an upper blind hole 6, a lower blind hole 7, a first resonance hole 8, a second resonance hole 9, an opening window 10, a third resonance hole 11, a fourth resonance hole 12, a fifth resonance hole 13, a sixth resonance hole 14, a seventh resonance hole 15, an eighth resonance hole 16, a capacitive coupling structure 17, a first transmission zero 18 and a second transmission zero 19.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
With reference to fig. 1, a dielectric filter coupling structure with capacitive coupling characteristics includes a dielectric filter, the dielectric filter includes a first dielectric resonator 1, a second dielectric resonator 2, an S-shaped through-slot capacitive coupling structure 3, and a coupling window 4, the connection between the middle portions of the first dielectric resonator 1 and the second dielectric resonator 2 is provided with the S-shaped through-slot capacitive coupling structure 3, the two sides of the connection between the first dielectric resonator 1 and the second dielectric resonator 2 are symmetrically provided with the coupling window 4, the coupling window 4 is provided with a center line mark 5, the S-shaped through-slot capacitive coupling structure 3 includes an upper blind hole 6 and a lower blind hole 7 which are staggered, and the cross sections of the upper blind hole 6 and the lower blind hole 7 are one of a circle, a square, and a polygon; the cross section size and the depth of going up blind hole 6 and lower blind hole 7 are different, and the dielectric block is squeezed into respectively from dielectric filter' S upper surface and lower surface to two blind holes of dislocation to S-shaped logical groove capacitive coupling structure 3, and constitutes at the inside intercommunication of medium, as long as it just can realize the capacitive coupling to be linked together in the inside S-shaped logical groove that forms of medium, and the form is various, and the scope is wider, does not have the limitation.
A first resonant hole 8 corresponding to the upper blind hole 6 is arranged in the middle of the first dielectric resonator 1, a second resonant hole 9 corresponding to the lower blind hole 7 is arranged in the middle of the second dielectric resonator 2, and a window 10 is reserved between the upper blind hole 6 and the lower blind hole 7; in the embodiment, as shown in fig. 2, the coupling amount of the capacitive coupling structure is determined by the center line mark 5 of the upper blind hole 6 and the lower blind hole 7, and the larger the distance 5 is, the closer the upper blind hole 6 is to the resonant hole 8, and the closer the lower blind hole 7 is to the second resonant hole 9, at this time, the stronger the magnetic field coupled from the first resonant hole 8 and the second resonant hole 9 is, after phase inversion, the inductive coupling induced by the magnetic field becomes the capacitive coupling, and the capacitive coupling is stronger, and vice versa, and in combination with fig. 3, the coupling amount of the capacitive coupling structure is also determined by the open window 10 between the upper blind hole 6 and the lower blind hole 7, and the larger the open window 10 is, the stronger the parasitic inductive coupling is, and the parasitic inductive coupling cancels the capacitive coupling generated by the S-shaped through-slot capacitive coupling structure, so as to reduce the capacitive coupling amount, and vice versa.
Example 2
As shown in fig. 4, the dielectric filter is integrated, and includes a third resonance hole 11, a fourth resonance hole 12, a fifth resonance hole 13, a sixth resonance hole 14, a seventh resonance hole 15, and an eighth resonance hole 16, and the third resonance hole, the fourth resonance hole, the fifth resonance hole, the sixth resonance hole, the seventh resonance hole, and the eighth resonance hole correspond to each other along the vertical cross section of the dielectric filter, the middle of the dielectric filter is provided with a capacitive coupling structure 17, and the left and right sides of the dielectric filter are respectively and correspondingly provided with a first transmission zero 18 and a second transmission zero 19; the capacitive coupling structure is used in a 6-cavity dielectric filter, two transmission zeros are generated, and as shown in fig. 5, the out-of-band rejection characteristic of the dielectric filter is improved;
as shown in fig. 4, the dielectric filter includes a third resonance hole 11, a fourth resonance hole 12, a fifth resonance hole 13, a sixth resonance hole 14, a seventh resonance hole 15, and an eighth resonance hole 16, and the main coupling is formed by a second open window between adjacent resonance holes, the second open window coupling is a magnetic coupling, and the larger the open window is, the stronger the magnetic coupling is, the wider the bandwidth of the filter is, and vice versa; by introducing the capacitive coupling structure 17 between the fourth resonance hole 12 and the seventh resonance hole 15, the first transmission zero 18 and the second transmission zero 19 can be generated on both sides of the filter passband, respectively, as shown in fig. 5, the stronger the capacitive coupling generated by the capacitive coupling structure 17, the closer the two transmission zeros are to the filter passband, and vice versa.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A dielectric filter coupling structure with capacitive coupling characteristics comprises a dielectric filter, wherein the dielectric filter comprises a first dielectric resonator (1), a second dielectric resonator (2), an S-shaped through groove capacitive coupling structure (3) and a coupling window (4), and is characterized in that the S-shaped through groove capacitive coupling structure (3) is arranged at the joint of the middle parts of the first dielectric resonator (1) and the second dielectric resonator (2), the coupling window (4) is symmetrically arranged at the two sides of the joint of the first dielectric resonator (1) and the second dielectric resonator (2), a center line mark (5) is arranged on the coupling window (4), the S-shaped through groove capacitive coupling structure (3) comprises an upper blind hole (6) and a lower blind hole (7) which are staggered, a first resonance hole (8) corresponding to the upper blind hole (6) is arranged at the middle part of the first dielectric resonator (1), and a second resonant hole (9) corresponding to the lower blind hole (7) is formed in the middle of the second dielectric resonator (2), and a window (10) is reserved between the upper blind hole (6) and the lower blind hole (7).
2. The dielectric filter coupling structure with capacitive coupling characteristics according to claim 1, wherein the cross-section of the upper and lower blind holes (6, 7) is one of circular, square and polygonal.
3. Dielectric filter coupling structure with capacitive coupling characteristics according to claim 1, characterized in that the upper blind via (6) and the lower blind via (7) differ in their cross-sectional size and depth.
4. The dielectric filter coupling structure with capacitive coupling characteristics according to claim 1, wherein the dielectric filter is an integral structure, the dielectric filter includes a third resonant hole (11), a fourth resonant hole (12), a fifth resonant hole (13), a sixth resonant hole (14), a seventh resonant hole (15), and an eighth resonant hole (16), and the third resonant hole, the fourth resonant hole, the fifth resonant hole, the sixth resonant hole, the seventh resonant hole, and the eighth resonant hole correspond to each other two by two along a vertical cross section thereof, the capacitive coupling structure (17) is disposed in the middle of the dielectric filter, and the first transmission zero (18) and the second transmission zero (19) are respectively and correspondingly disposed on the left side and the right side of the dielectric filter.
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| EP1337003A1 (en) * | 1996-02-09 | 2003-08-20 | Ngk Spark Plug Co., Ltd. | Dielectric filter and method for adjusting resonance frequency of the same |
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| JP6291699B2 (en) * | 2015-04-13 | 2018-03-14 | エース テクノロジーズ コーポレーション | Cavity filter using cross coupling |
| CN109309272A (en) * | 2018-11-14 | 2019-02-05 | 苏州波发特电子科技有限公司 | A kind of capacitive coupling structure for dielectric filter |
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| CN208806343U (en) * | 2018-09-06 | 2019-04-30 | 武汉凡谷电子技术股份有限公司 | A kind of capacitive coupling device and filter |
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- 2019-08-14 CN CN201910746564.2A patent/CN112397856B/en active Active
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| EP1337003A1 (en) * | 1996-02-09 | 2003-08-20 | Ngk Spark Plug Co., Ltd. | Dielectric filter and method for adjusting resonance frequency of the same |
| CN201528036U (en) * | 2009-10-22 | 2010-07-14 | 南京广顺网络通信设备有限公司 | Capacitive cross coupling structure of crossing middle resonant cavity |
| JP6291699B2 (en) * | 2015-04-13 | 2018-03-14 | エース テクノロジーズ コーポレーション | Cavity filter using cross coupling |
| CN208806343U (en) * | 2018-09-06 | 2019-04-30 | 武汉凡谷电子技术股份有限公司 | A kind of capacitive coupling device and filter |
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| "TE01δ模容性交叉耦合介质腔体滤波器设计";郭勤武等;《湖北大学学报（自然科学版）》;20171030(第5期);第511-516、522页 * |
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