CN114665237B - Dual-mode and dual-ridge dielectric filling filter - Google Patents
Dual-mode and dual-ridge dielectric filling filter Download PDFInfo
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- CN114665237B CN114665237B CN202210382578.2A CN202210382578A CN114665237B CN 114665237 B CN114665237 B CN 114665237B CN 202210382578 A CN202210382578 A CN 202210382578A CN 114665237 B CN114665237 B CN 114665237B
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- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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- H01P1/2002—Dielectric waveguide filters
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Abstract
The invention discloses a dual-mode double-ridge dielectric filling filter, which is a dielectric block with a conductive coating on the surface, wherein two dual-mode double-ridge resonators are formed on the dielectric block, and the double ridges of the dual-mode double-ridge resonators are orthogonally loaded on two adjacent sides of the dielectric block and are used for adjusting TE 102 Die and TE 201 The two dual-mode dual-ridge resonators are coupled through a coupling diaphragm, the coupling diaphragm longitudinally moves on the cross section of the dielectric block and is used for controlling cross coupling between the two dual-mode dual-ridge resonators, and the window size of the coupling diaphragm controls direct coupling between the two dual-mode dual-ridge resonators. The invention can be applied to 5G frequency band, and has the advantages of strong out-of-band selectivity, small in-band insertion loss, small volume, rapid selective roll-off at the edge of the pass band and the like.
Description
Technical Field
The invention relates to the technical field of radio frequency and microwave filters, in particular to a dual-mode and dual-ridge dielectric filling filter.
Background
With the rapid development of wireless communication systems, the performance requirements of radio frequency devices are also higher and higher. For radio frequency selective components, the design of elliptic and quasi-elliptic filters becomes increasingly important under the condition of limited spectrum resources. Among them, dielectric resonator filters are widely studied and used in wireless systems due to their excellent performance, such as low cost, miniaturization, low insertion loss, etc.
Conventional dielectric filters are typically partially filled and are also referred to as dielectric loaded metal cavity filters. These filters are characterized in that they comprise a metallic external cavity and a dielectric block disposed in the cavity. At present, a new type of dielectric filter, also called a dielectric filled filter, is attracting much attention. The existing dielectric filling filter generally tunes the resonant frequency in a loading blind hole mode, the requirement on processing precision is higher, and the frequency tuning after processing can only move to low frequency. An important issue in filter design is to introduce transmission zeros to improve selectivity. When a single-mode resonator is used for introducing a transmission zero point, negative coupling is inevitably required to be obtained, and cross coupling is required to be introduced, so that the filter structure cannot keep a linear structure, and certain difficulty is brought to the processing and tuning of the filter. When using a dual-mode resonator, due to the inherent properties of the dual-mode resonator, negative coupling can still be obtained by a linear resonator arrangement, reducing the difficulty for processing and tuning.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a dual-mode double-ridge dielectric filling filter which can be applied to a 5G frequency band, has strong out-of-band selectivity, small in-band insertion loss, small volume and fast selective roll-off of a pass band edge.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a double-mode double-ridge dielectric filling filter is a dielectric block with a conductive coating on the surface, two double-mode double-ridge resonators are formed on the dielectric block, and the double ridges of the double-mode double-ridge resonators are orthogonally loaded on two adjacent sides of the dielectric block and used for adjusting TE 102 Die and TE 201 And the size of a window of the coupling diaphragm controls the direct coupling between the two dual-mode double-ridge resonators.
Further, the longitudinal ridge of the cross section of the dielectric block is located at TE 102 Strong magnetic field region of mode and TE 201 Zero field region of mode, the length of the ridge only affecting TE 102 The resonant frequency of the mode; the ridge transverse to the cross-section of the dielectric block is located at TE 201 Strong magnetic field region of mode and TE 102 Zero field region of mode, the length of the ridge only affecting TE 201 The resonant frequency of the mode.
Further, each dual-mode and dual-ridge resonator is loaded with a blind hole, and the blind hole is positioned in TE 102 Strong electric field region of mode and TE 201 Zero electric field region of the die, the height of the blind via affecting only TE 102 The resonant frequency of the mode.
Further, any one of the two dual-mode double-ridge resonators is loaded with a blind hole, and the TE of the dual-mode double-ridge resonator loaded with the blind hole 102 The resonant frequency of the mode can be controlled by the height of the blind via, in addition to the length of the ridge, but its TE 201 The resonant frequency of the mode can still only be controlled by the length of the ridge.
Furthermore, the surface of the dielectric block is connected with two coaxial connectors, the coaxial connectors are used as input and output ports to feed the filter, and the depth of the inward embedding of the coaxial inner conductors determines the coupling strength of the input and output ports.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention can realize the TE by adding ridges or introducing blind holes on two adjacent sides of the dielectric block 102 Die and TE 201 Control of the resonant frequency of the mode to move to a high or low frequency. Most of the existing dielectric filling filters realize control over the resonant frequency through blind holes, and can only realize control over the movement of the resonant frequency to low frequency.
2. The invention adds ridges on two adjacent sides of the dielectric block to ensure TE 102 Die and TE 201 The resonant frequency of the mode is controlled, and then the dual-mode filter is realized; two modes are applied in one resonator, so that the number of resonant cavities required by the filter can be reduced, the size of the filter is further reduced, and the miniaturization of devices is realized.
3. The double-mode double-ridge dielectric filling filter provided by the invention can use less cavities to obtain higher selectivity. The filter designed by the two dual-mode double-ridge resonators provided by the invention has higher selectivity than a filter realized by six single-mode resonators.
4. The dual-mode double-ridge resonator provided by the invention can be used as the basis of the design of a filter module, and different filter responses can be obtained only by changing the parameters of the resonant frequency. In the traditional filter design, parameters of resonant frequency, input-output coupling and cavity-to-cavity coupling need to be changed, so that different filter responses can be obtained.
Drawings
Fig. 1 is a perspective view of a dual-mode dual-ridge dielectric filled filter structure provided in embodiment 1.
Fig. 2 is a top view of a dual-mode dual-ridge dielectric filled filter structure provided in embodiment 1.
Fig. 3 is a graph of the S-parameter of the dual-mode dual-ridge dielectric filling filter provided in example 1.
Fig. 4 is a perspective view of a dual-mode dual-ridge dielectric-filled filter structure provided in embodiment 2.
Fig. 5 is a graph of the S-parameter of the dual-mode dual-ridge dielectric filling filter provided in example 2.
Fig. 6 is a perspective view of a dual-mode dual-ridge dielectric filled filter structure provided in embodiment 3.
Fig. 7 is a top view of a dual-mode dual-ridge dielectric filled filter structure provided in embodiment 3.
Fig. 8 is a graph of the S-parameter of the dual-mode dual-ridge dielectric filling filter provided in example 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
Referring to fig. 1 and fig. 2, the present embodiment provides an asymmetric-response dual-mode double-ridge dielectric-filled filter, which is a rectangular dielectric block D1 with a silver-plated surface, the top of the dielectric block D1 is connected to coaxial connectors S1 and S2, the coaxial connectors are used as input and output ports to feed power to the filter, and the embedded depth of a coaxial inner conductor determines the coupling strength of the input and output ports. Two dual-mode double-ridge resonators are formed on the dielectric block D1, and each dual-mode double-ridge resonator provides two transmission poles and a transmission zero; wherein the TE of the dual-mode double-ridge resonator on the left side of the figure 102 Die and TE 201 The resonant frequency of the mode is respectively controlled by the length of the ridge L2 and the length of the ridge L1, and the ridge L2 and the ridge L1 are orthogonally loaded on two adjacent sides of the dual-mode dual-ridge resonator; TE of the dual-mode double-ridge resonator located at the right side of the figure 102 Die and TE 201 The resonant frequency of the mode is respectively controlled by the length of the ridge L3 and the length of the ridge L4, and the ridge L3 and the ridge L4 are orthogonally loaded on two adjacent sides of the dual-mode dual-ridge resonator. Each dual-mode double-ridge resonator is loaded with a blind hole B1 and B2 respectively. Wherein the height of the blind hole B1 in the left double-mode double-ridge resonator controls the TE thereof 102 Resonant frequency of the mode, blind hole in the right dual-mode double-ridge resonatorHeight control of B2 its TE 102 The resonant frequency of the mode. The two double-mode double-ridge resonators are coupled through a coupling diaphragm C1, the coupling diaphragm C1 moves longitudinally on the cross section of the dielectric block and is used for controlling cross coupling between the two double-mode double-ridge resonators, and the window size of the coupling diaphragm controls direct coupling between the two double-mode double-ridge resonators.
Fig. 3 shows the S-parameter curve of the dual-mode dual-ridge dielectric-filled filter of the present embodiment, and it can be seen from the figure that the asymmetric response can be obtained in the present embodiment, and both transmission zeros are on the left side of the passband.
Example 2
Referring to fig. 4, the present embodiment provides another asymmetric response dual-mode dual-ridge dielectric-filled filter. Unlike example 1, no blind holes were introduced in this example. Thus, TE of two dual-mode double-ridge resonators 102 Die and TE 201 The resonant frequency of the mode is controlled only by the length of the ridge.
Fig. 5 shows the S-parameter curve of the above-mentioned dual-mode double-ridge dielectric-filled filter of this embodiment, and it can be seen from the figure that this embodiment can obtain an asymmetric response complementary to embodiment 1, and both transmission zeros are on the right side of the passband.
Example 3
Referring to fig. 6 and 7, the present embodiment provides a symmetric response dual-mode dual-ridge dielectric-filled filter. Different from the embodiment 1 and the embodiment 2, in the two dual-mode dual-ridge resonators in the embodiment, one dual-mode dual-ridge resonator is not introduced with a blind hole, and the other dual-mode dual-ridge resonator is introduced with a blind hole. Thus, the dual-mode double-ridge resonator without blind via introduction, its TE 102 Die and TE 201 The resonant frequency of the mode is still controlled by the length of the ridge; and the dual-mode dual-ridge resonator with blind via introduced therein, its TE 102 The resonant frequency of the mode can be controlled by the height of the blind via, but its TE, in addition to the length of the ridge 201 The resonant frequency of the mode can still only be controlled by the length of the ridge.
Fig. 8 shows the S-parameter curve of the dual-mode double-ridge dielectric-filled filter of the present embodiment, and it can be seen from the figure that the present embodiment can obtain a symmetric response, in which one transmission zero is on the right side of the pass band and the other transmission zero is on the left side of the pass band.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (5)
1. A dual-mode, dual-ridge dielectric filled filter, comprising: the filter is a dielectric block with a conductive coating on the surface, two dual-mode and double-ridge resonators are formed on the dielectric block, and the double ridges of the dual-mode and double-ridge resonators are orthogonally loaded on two adjacent sides of the dielectric block and are used for adjusting TE 102 Die and TE 201 The two dual-mode dual-ridge resonators are coupled through a coupling diaphragm which moves longitudinally on the cross section of the dielectric block and is used for controlling cross coupling between the two dual-mode dual-ridge resonators, and the size of a window of the coupling diaphragm is used for controlling direct coupling between the two dual-mode dual-ridge resonators.
2. A dual-mode dual-ridge dielectric-filled filter as defined in claim 1, wherein: the longitudinal ridge of the dielectric block cross section is located at TE 102 Strong magnetic field region of mode and TE 201 Zero field region of the mode, the length of the ridge only affecting TE 102 The resonant frequency of the mode; the ridge transverse to the cross-section of the dielectric block is located at TE 201 Strong magnetic field region of mode and TE 102 Zero field region of the mode, the length of the ridge only affecting TE 201 The resonant frequency of the mode.
3. A dual-mode, dual-ridge dielectric-filled filter as defined in claim 1, wherein: each dual-mode double-ridge resonator is loadedWith a blind hole in the TE 102 Strong electric field region of mode and TE 201 Zero electric field region of the die, the height of the blind via affecting only TE 102 The resonant frequency of the mode.
4. A dual-mode dual-ridge dielectric-filled filter as defined in claim 1, wherein: any one of the two dual-mode double-ridge resonators is loaded with a blind hole, and the TE of the dual-mode double-ridge resonator loaded with the blind hole 102 The resonant frequency of the mode can be controlled by the height of the blind via, in addition to the length of the ridge, but its TE 201 The resonant frequency of the mode can still only be controlled by the length of the ridge.
5. A dual-mode dual-ridge dielectric-filled filter as defined in claim 1, wherein: the surface of the dielectric block is connected with two coaxial connectors, the coaxial connectors are used as input and output ports to feed the filter, and the depth of the inward embedding of the coaxial inner conductors determines the coupling strength of the input and output ports.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210382578.2A CN114665237B (en) | 2022-04-13 | 2022-04-13 | Dual-mode and dual-ridge dielectric filling filter |
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| CN202210382578.2A CN114665237B (en) | 2022-04-13 | 2022-04-13 | Dual-mode and dual-ridge dielectric filling filter |
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| CN114665237B true CN114665237B (en) | 2022-12-16 |
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| CN117393984B (en) * | 2023-11-21 | 2024-08-16 | 南通大学 | Orthogonal double-ridge dielectric waveguide resonator and filter comprising same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4973925A (en) * | 1989-09-20 | 1990-11-27 | Valentine Research, Inc. | Double-ridge waveguide to microstrip coupling |
| JP3405140B2 (en) * | 1996-12-11 | 2003-05-12 | 株式会社村田製作所 | Dielectric resonator |
| CN109509950B (en) * | 2019-01-08 | 2023-11-03 | 华南理工大学 | Miniaturized dual-frenquency waveguide filter |
| CN110265755B (en) * | 2019-07-19 | 2024-01-23 | 深圳国人科技股份有限公司 | Dielectric waveguide filter |
| CN111146543A (en) * | 2020-01-20 | 2020-05-12 | 成都北斗天线工程技术有限公司 | Cavity filter filled with medium |
| CN113690560B (en) * | 2020-05-18 | 2023-06-09 | 大富科技(安徽)股份有限公司 | Dielectric filter, dielectric resonator and communication equipment |
| CN111816971A (en) * | 2020-08-07 | 2020-10-23 | 物广系统有限公司 | Resonance structure for controlling distance of harmonic wave and dielectric filter |
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