CN113036329B - Dual-channel filter based on dual-mode dielectric resonator - Google Patents
Dual-channel filter based on dual-mode dielectric resonator Download PDFInfo
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- CN113036329B CN113036329B CN202110320539.5A CN202110320539A CN113036329B CN 113036329 B CN113036329 B CN 113036329B CN 202110320539 A CN202110320539 A CN 202110320539A CN 113036329 B CN113036329 B CN 113036329B
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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
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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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
- H01P7/105—Multimode resonators
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Abstract
The invention relates to a dual-channel filter based on a dual-mode dielectric resonator, which comprises a metal cavity, a first dual-mode dielectric resonator and a second dual-mode dielectric resonator which are cascaded and positioned in the metal cavity, wherein two input ports which are coupled with the first dual-mode dielectric resonator and are positioned in different mode electric field directions and two output ports which are coupled with the second dual-mode dielectric resonator and are positioned in different mode electric field directions are fixed on the bottom wall of the metal cavity, and one input port and one output port which are positioned in different mode electric field directions form a filter. The two filters are integrated together and designed to share the same dual-mode dielectric resonator, and the dual-channel filter is designed, so that the size is reduced, and the cost is saved.
Description
Technical Field
The invention belongs to the technical field of radio frequency communication, and relates to a dual-channel filter based on a dual-mode dielectric resonator.
Background
In recent years, with the rapid development of modern communication systems, the radio frequency front end is developing towards miniaturization and low loss. As one of the key components of the rf front end, filters are used in large quantities. Therefore, reducing the number of filters is significant for reducing the design cost of the rf front end. However, for the mainstream design method at present, when a plurality of filters need to be designed, a stacking manner is often adopted, the circuit size is large, and the design and processing cost is high. In recent years, the fusion design of multifunctional devices has received much attention. Two or even a plurality of filters are designed in a fusion mode, so that the filters share one device, and the circuit size can be effectively reduced.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a dual-channel filter based on a dual-mode dielectric resonator, which is designed by combining two filters together and has the advantages of small circuit volume and low design cost.
In order to achieve the object of the invention, the invention provides a dual-mode dielectric resonator-based dual-channel filter, which comprises a metal cavity, a first dual-mode dielectric resonator and a second dual-mode dielectric resonator which are cascaded and positioned in the metal cavity, the first double-mode dielectric resonator and the second double-mode dielectric resonator are square double-mode dielectric resonators and have two orthogonal degenerate modes with the same frequency, two input ports coupled with the first double-mode dielectric resonator and two output ports coupled with the second double-mode dielectric resonator are fixed on the bottom wall of the metal cavity, the two input ports are respectively arranged in two mode electric field directions of the first double-mode dielectric resonator, the two output ports are respectively arranged in two mode electric field directions of the second double-mode dielectric resonator, and one input port and one output port which are positioned in different mode electric field directions form a filter.
The two filters are designed by being fused together, the two same dual-mode dielectric resonators are shared, and the dual-channel filter is designed, so that the size is reduced, and the cost is saved.
Drawings
The invention will be further described with reference to the accompanying drawings;
fig. 1 is a three-dimensional view of a dual-channel filter based on a dual-mode dielectric resonator according to the present invention.
Fig. 2 is a top view of the dual-channel filter based on the dual-mode dielectric resonator of the present invention.
Fig. 3(a) is a top view of an electric field of mode a in the dual-mode dielectric resonator.
Fig. 3(B) is a top view of an electric field of mode B in the dual-mode dielectric resonator.
Fig. 4 is a graph of the amplitude-frequency response of the dual-channel filter based on the dual-mode dielectric resonator.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1 and fig. 2, the dual-channel filter based on the dual-mode dielectric resonator according to the embodiment of the present invention includes a metal cavity 1, and a first dual-mode dielectric resonator 2 and a second dual-mode dielectric resonator 3, which are located in the metal cavity and are cascaded. The first double-mode dielectric resonator 2 and the second double-mode dielectric resonator 3 are coupled through a gap in the middle of the metal cavity 1.
In the specific circuit design process, a square dual-mode dielectric resonator is adopted, and comprises two same-frequency orthogonal degenerate modes (a mode A and a mode B). The electric field directions according to mode a and mode B are parallel to or coincide with two diagonals of a single square cavity, respectively, as shown in fig. 3(a) and 3 (B). Since the electric field directions of the mode a and the mode B are perpendicular to each other, there is a good isolation between the modes. And since the resonant frequencies of mode a and mode B are the same, the center frequencies of the two filters are the same.
Two input ports coupled with the first double-mode dielectric resonator 2 through a feeder line and two output ports coupled with the second double-mode dielectric resonator 3 through the feeder line are fixed on the bottom wall of the metal cavity. Two input ports are respectively arranged in two mode electric field directions of the first double-mode dielectric resonator 2, two output ports are respectively arranged in two mode electric field directions of the second double-mode dielectric resonator 3, and one input port and one output port which are positioned in different mode electric field directions form a filter.
It can be seen that the dual-channel filter of the present embodiment includes two independent filters, and uses independent ports. For example, port 1 and port 2 constitute a separate filter; port 3 and port 4 constitute another filter.
The device parameters of the dual-channel filter based on the dual-mode dielectric resonator in the embodiment are as follows:
the length of the metal cavity is 83mm, the width is 40mm, and the height is 35 mm; the side length of the square dual-mode dielectric resonator is 25mm, and the height of the square dual-mode dielectric resonator is 20 mm; the heights of the feeder lines of the input port and the output port are both 34 mm; the vertical distance from the two input end feeders to the first double-mode dielectric resonator 2 and the vertical distance from the two output end feeders to the second double-mode dielectric resonator 3 are both 4.6 mm.
The amplitude-frequency response of the dual-channel filter based on the dual-mode dielectric resonator is shown in fig. 4. Due to structural symmetry, the amplitude-frequency responses of the two channels are completely consistent. In particular, the present invention relates to a method for producing,S 11andS 33perfect coincidence (return loss better than-19 dB),S 21andS 43complete coincidence(the insertion losses are all-0.2 dB),S 41andS 23fully coincident (port isolation better than-21 dB). Here, the port isolation of the two-channel filters is characterized by the magnitude of the energy transfer from the input of one of the filters to the output of the other filter.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A dual-channel filter based on dual-mode dielectric resonators comprises a metal cavity (1), a first dual-mode dielectric resonator (2) and a second dual-mode dielectric resonator (3) which are cascaded and positioned in the metal cavity, the first double-mode dielectric resonator (2) and the second double-mode dielectric resonator (3) are square resonators and have two orthogonal degenerate modes with the same frequency, two input ports coupled with the first double-mode dielectric resonator (2) and two output ports coupled with the second double-mode dielectric resonator (3) are fixed on the bottom wall of the metal cavity, the two input ports are respectively arranged in two mode electric field directions of the first double-mode dielectric resonator (2), the two output ports are respectively arranged in two mode electric field directions of the second double-mode dielectric resonator (3), and one input port and one output port which are positioned in different mode electric field directions form a filter.
2. The dual-channel filter based on the dual-mode dielectric resonator of claim 1, wherein: the first double-mode dielectric resonator (2) and the second double-mode dielectric resonator (3) are coupled through a gap in the middle of the metal cavity (1).
3. The dual-channel filter based on the dual-mode dielectric resonator of claim 1, wherein: the bottom of the double-mode dielectric resonator is in direct contact with the bottom surface of the metal cavity, and the top of the double-mode dielectric resonator is spaced from the top of the metal cavity.
4. The dual-channel filter based on the dual-mode dielectric resonator of claim 1, wherein: the input port and the output port are coupled with the dual-mode dielectric resonator through feeder lines.
5. The dual-channel filter based on the dual-mode dielectric resonator of claim 1, wherein: the electric field direction of the mode A of the first double-mode dielectric resonator (2) is parallel to the electric field direction of the mode A of the second double-mode dielectric resonator (3), and the electric field direction of the mode B of the first double-mode dielectric resonator (2) is parallel to the electric field direction of the mode B of the second double-mode dielectric resonator (3).
6. The dual-channel filter based on the dual-mode dielectric resonator of claim 5, wherein: the metal cavity (1) is a rectangular cavity and comprises two square cavities, and the directions of electric fields of two modes of the dual-mode dielectric resonator are respectively parallel to or coincided with two diagonals of the corresponding square cavity.
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| CN202110320539.5A CN113036329B (en) | 2021-03-25 | 2021-03-25 | Dual-channel filter based on dual-mode dielectric resonator |
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| CN202110320539.5A CN113036329B (en) | 2021-03-25 | 2021-03-25 | Dual-channel filter based on dual-mode dielectric resonator |
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| CN113036329A CN113036329A (en) | 2021-06-25 |
| CN113036329B true CN113036329B (en) | 2022-04-12 |
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| KR100783860B1 (en) * | 2006-11-17 | 2007-12-10 | 현대자동차주식회사 | A dual-mode dielectric resonator |
| JP2008278225A (en) * | 2007-04-27 | 2008-11-13 | Fujitsu Ltd | Bandpass filter and its manufacturing method |
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| CN109326854A (en) * | 2018-09-10 | 2019-02-12 | 桂林电子科技大学 | A kind of middle tunable IR bandstop filter based on graphene |
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| CN102593561B (en) * | 2012-02-13 | 2016-01-20 | 江苏贝孚德通讯科技股份有限公司 | The bimodulus coated by dielectric cavity filter of circular corner cut |
| CN104767016A (en) * | 2015-03-31 | 2015-07-08 | 南通大学 | Differential band-pass filter based on TE01delta mode dielectric resonators |
| CN205039225U (en) * | 2015-06-23 | 2016-02-17 | 武汉凡谷陶瓷材料有限公司 | Bimodulus dielectric filter with adjustable transmission zero device |
| CN105406158A (en) * | 2015-12-29 | 2016-03-16 | 华南理工大学 | Dual-mode dielectric filter enabling frequency and coupling control based metal patches |
| CN107634291B (en) * | 2017-08-24 | 2020-04-07 | 南通大学 | Dual-passband differential filter based on miniaturized dual-mode dielectric resonator |
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|---|---|---|---|---|
| KR100783860B1 (en) * | 2006-11-17 | 2007-12-10 | 현대자동차주식회사 | A dual-mode dielectric resonator |
| JP2008278225A (en) * | 2007-04-27 | 2008-11-13 | Fujitsu Ltd | Bandpass filter and its manufacturing method |
| CN109326854A (en) * | 2018-09-10 | 2019-02-12 | 桂林电子科技大学 | A kind of middle tunable IR bandstop filter based on graphene |
| CN109149037A (en) * | 2018-10-10 | 2019-01-04 | 湖北大学 | A kind of medium bimodule band-pass filter and control method based on TM mode |
Non-Patent Citations (1)
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| 基于双模介质谐振器的平衡/巴伦滤波电路的研究;李姜;《中国优秀硕士学位论文全文数据库》;20190715;全文 * |
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