Hybrid electromagnetic coupled all-dielectric filter

Abstract

The present invention is applicable to the technical field of dielectric filters, and provides a hybrid electromagnetic coupling all-dielectric filter, comprising: a filter body; at least two dielectric resonance units, distributed on the filter body; two input and output ports, arranged on the filter body and respectively connected to the head and tail of at least two of the dielectric resonance units; at least one coupling window, formed by the connection intervals between the dielectric resonance units for generating magnetic coupling; at least one electric coupling blind hole, arranged in at least one coupling window for generating electric coupling. Thus, the present invention can generate electric coupling and magnetic coupling simultaneously in one coupling window, and can realize elliptic function filtering characteristics in the case of only the main coupling path, and has the advantages of simple implementation and convenient processing.

Description

Technical Field

[0001] The present invention relates to the technical field of dielectric filters, and in particular to a hybrid electromagnetic coupling all-dielectric filter. Background Art

[0002] All-dielectric filters have been widely used in 5G communication systems due to their extremely small size. However, with the continuous development of multi-frequency integration technology, the requirements for the volume and passband selection characteristics of all-dielectric filters are becoming higher and higher. Therefore, how to improve the passband selection characteristics of all-dielectric filters is an urgent problem to be solved in the development of all-dielectric filters.

[0003] According to the coupled resonant filter theory: coupling is required between the resonant units to achieve the passband filtering characteristics, and the coupling is divided into two categories: electric coupling and magnetic coupling. In the design of traditional all-dielectric filters, the coupling between the resonant units mostly adopts a single coupling mode, or an approximate single coupling mode, and rarely adopts a mixed coupling with both electric coupling and magnetic coupling. Therefore, the prior art solution is to achieve the elliptic function filtering characteristics by cross-coupling of a single coupling mode, thereby improving the passband selection characteristics of the all-dielectric filter. However, the prior art solution requires three resonant units to be realized, and has the disadvantages of large size and complex structure.

[0004] In summary, the existing methods have many problems in practical use, so it is necessary to improve them. Summary of the invention

[0005] In view of the above-mentioned defects, the object of the present invention is to provide a hybrid electromagnetic coupling all-dielectric filter, which can improve the passband selection characteristics of the all-dielectric filter and has the advantages of smaller size and easy processing.

[0006] In order to achieve the above object, the present invention provides a hybrid electromagnetic coupling all-dielectric filter, comprising:

[0007] filter body;

[0008] At least two dielectric resonance units are distributed on the filter body;

[0009] Two input and output ports are provided on the filter body and are respectively connected to the head and tail of at least two of the dielectric resonant units;

[0010] at least one coupling window, formed by the connection intervals between the dielectric resonant units, for generating magnetic coupling;

[0011] At least one electrical coupling blind hole is disposed in at least one coupling window for generating electrical coupling.

[0012] According to the hybrid electromagnetic coupling all-dielectric filter, the coupling window is provided with at least one through hole for separating the electric coupling and the magnetic coupling.

[0013] According to the hybrid electromagnetic coupling all-dielectric filter, the through hole is a circular hole or an elongated hole.

[0014] According to the hybrid electromagnetic coupling all-dielectric filter, a tuning blind hole for adjusting the resonant frequency is provided on the top of the dielectric resonance unit, and the two input and output ports are respectively connected to the head and tail bottoms of at least two of the dielectric resonance units.

[0015] According to the hybrid electromagnetic coupling all-dielectric filter, the tuning blind hole and / or the electrical coupling blind hole are cylindrical or prismatic.

[0016] According to the hybrid electromagnetic coupling all-dielectric filter, the filter body is made of dielectric material.

[0017] According to the hybrid electromagnetic coupling all-dielectric filter, the filter body is made of ceramic material.

[0018] According to the hybrid electromagnetic coupling all-dielectric filter, a metal plating layer is attached to the outer surface of the filter body.

[0019] According to the hybrid electromagnetic coupled all-dielectric filter, the metal plating layer is a silver plating layer.

[0020] The hybrid electromagnetic coupling all-dielectric filter described in the present invention includes: a filter body; at least two dielectric resonance units, distributed on the filter body; two input and output ports, arranged on the filter body and respectively connected to the head and tail of at least two of the dielectric resonance units; at least one coupling window, formed by the connection intervals between the dielectric resonance units for generating magnetic coupling; at least one electric coupling blind hole, arranged in at least one coupling window for generating electric coupling. Thus, the magnetic coupling generated by the coupling window itself and the electric coupling generated by the electric coupling blind hole of the present invention finally realize hybrid electromagnetic coupling, thereby generating a transmission zero point near the passband, improving the passband selection characteristics of the dielectric filter; and having the advantages of smaller volume and easy processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A model structure diagram of the hybrid electromagnetic coupling all-dielectric filter according to the first embodiment of the present invention;

[0022] Figure 2 A topological structure diagram of the hybrid electromagnetic coupling all-dielectric filter according to the first embodiment of the present invention;

[0023] Figure 3This is a simulation diagram of the hybrid electromagnetic coupling all-dielectric filter described in the first embodiment of the present invention when the electric coupling is smaller than the magnetic coupling;

[0024] Figure 4 This is a simulation diagram of the hybrid electromagnetic coupling all-dielectric filter described in the first embodiment of the present invention when the electric coupling is greater than the magnetic coupling;

[0025] Figure 5 This is a model structure diagram of the hybrid electromagnetic coupling all-dielectric filter described in the second embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Figure 1The hybrid electromagnetic coupling all-dielectric filter described in the first embodiment of the present invention is shown, including a filter body; at least two dielectric resonance units are distributed on the filter body, two input and output ports are arranged on the filter body and are respectively connected to the head and tail of the at least two dielectric resonance units; at least one coupling window is formed by the connection intervals between the dielectric resonance units to generate magnetic coupling; at least one electric coupling blind hole 203 is arranged in at least one of the coupling windows to generate electric coupling. Specifically, the present embodiment includes four dielectric resonance units, namely, a first dielectric resonance unit 101, a second dielectric resonance unit 102, a third dielectric resonance unit 103 and a fourth dielectric resonance unit 104; and also includes three coupling windows, namely, a first coupling window 201, a second coupling window 202 and a third coupling window 204; as shown in the figure, the first coupling window 201 is between the first dielectric resonance unit 101 and the second dielectric resonance unit 102, the second coupling window 202 is between the second dielectric resonance unit 102 and the third dielectric resonance unit 103, and the third coupling window 204 is between the third dielectric resonance unit 103 and the fourth dielectric resonance unit 104; magnetic coupling can be generated through the coupling windows, and the magnetic coupling strength is related to the thickness of the coupling windows. The larger the coupling window, the stronger the magnetic coupling strength; the smaller the coupling window, the weaker the magnetic coupling strength; the present embodiment is provided with an electric coupling blind hole 203, which is provided at The second coupling window 202 is used to generate electric coupling, that is, electric coupling and magnetic coupling can be realized simultaneously in the same coupling window; and the electric coupling strength is related to the depth of the electric coupling blind hole 203. Within a certain range, the deeper the depth of the electric coupling blind hole 203, the weaker the electric coupling strength; the shallower the depth of the electric coupling blind hole 203, the stronger the electric coupling strength; the magnetic coupling generated by the coupling window itself and the electric coupling generated by the electric coupling blind hole 203 realize hybrid electromagnetic coupling; therefore, in the case of only the main coupling path, the present embodiment generates hybrid electromagnetic coupling between two resonant units (the second dielectric resonant unit 102 and the third dielectric resonant unit 103) to realize elliptic function filtering characteristics, and improve the passband selection characteristics of the all-dielectric filter. Compared with the existing method that requires hybrid electromagnetic coupling to be generated between three resonant units, the present embodiment only generates hybrid electromagnetic coupling between two resonant units, which has the characteristics of smaller volume, simpler structure and convenient processing; the specific topological structure of the present embodiment is as follows Figure 2 shown.

[0028] The top of the dielectric resonance unit is provided with a tuning blind hole for adjusting the resonance frequency, and the two input and output ports are respectively connected to the head and tail bottoms of at least two dielectric resonance units. The two input and output ports of this embodiment are arranged at the bottoms of the head and tail resonance units, that is, at the bottoms of the first dielectric resonance unit 101 and the fourth dielectric resonance unit 104 respectively; the resonance frequency of the filter is related to the depth of the tuning blind hole, and its resonance frequency can be adjusted by adjusting the depth of the tuning blind hole.

[0029] The tuning blind hole and / or the electrical coupling blind hole 203 are cylindrical, prism-shaped, or other irregular cylindrical shapes, etc. For the convenience of production, in this embodiment, the tuning blind hole and the electrical coupling blind hole 203 are preferably both cylindrical.

[0030] The filter body is made of dielectric material, and in this embodiment, it is preferably made of ceramic material; the outer surface of the filter body is attached with a layer of metal plating, and more preferably, the metal plating is a silver plating; that is, the full dielectric filter of this embodiment is composed of ceramic dielectric material and a metal silver layer coated on the outer surface of the ceramic dielectric material.

[0031] See also Figure 3-4 The transmission zero point position generated by the hybrid electromagnetic coupling all-dielectric filter is controllable. When the electric coupling is greater than the magnetic coupling, the transmission zero point will be generated on the right side of the passband. When the electric coupling is less than the magnetic coupling, the transmission zero point will be generated on the left side of the passband.

[0032] Figure 5The hybrid electromagnetic coupling all-dielectric filter described in the second embodiment of the present invention is shown, including a filter body; at least two dielectric resonance units are distributed on the filter body, two input and output ports are arranged on the filter body and are respectively connected to the head and tail of the at least two dielectric resonance units; at least one coupling window is formed by the connection intervals between the dielectric resonance units to generate magnetic coupling; at least one electric coupling blind hole 213 is arranged in at least one of the coupling windows to generate electric coupling. Similar to the above embodiment, the present embodiment includes four dielectric resonance units, namely, a first dielectric resonance unit 111, a second dielectric resonance unit 112, a third dielectric resonance unit 113 and a fourth dielectric resonance unit 114; and also includes three coupling windows, namely, a first coupling window 211, a second coupling window 212 and a third coupling window 214; as shown in the figure, the first coupling window 211 is between the first dielectric resonance unit 111 and the second dielectric resonance unit 112, the second coupling window 212 is between the second dielectric resonance unit 112 and the third dielectric resonance unit 113, and the third coupling window 214 is between the third dielectric resonance unit 113 and the fourth dielectric resonance unit 114; the present embodiment is provided with an electric The coupling blind hole 213 is arranged in the second coupling window 212 to generate electric coupling, that is, electric coupling and magnetic coupling can be realized simultaneously in the same coupling window; the magnetic coupling generated by the coupling window itself and the electric coupling generated by the electric coupling blind hole 213 realize hybrid electromagnetic coupling; therefore, in the case of only the main coupling path, the present embodiment generates hybrid electromagnetic coupling between the two resonance units (the second dielectric resonance unit 112 and the third dielectric resonance unit 113) to realize the elliptic function filtering characteristics, and improve the passband selection characteristics of the all-dielectric filter. Compared with the existing method that requires hybrid electromagnetic coupling to be generated between three resonance units, the present embodiment only generates hybrid electromagnetic coupling between two resonance units, and has the characteristics of smaller volume, simpler structure and convenient processing.

[0033] The difference from the first embodiment is that the coupling window of this embodiment is provided with at least one through hole 301 for separating the electrical coupling and the magnetic coupling; specifically, a through hole 301 is provided on the second coupling window 212, and the arrangement of the through hole 301 can play the role of separating the electrical coupling and the magnetic coupling. The through hole 301 of this embodiment is a circular hole; of course, in other embodiments, it can also be an elongated hole or a through hole of other shapes.

[0034] In summary, the present invention designs an all-dielectric filter using a hybrid electromagnetic coupling mode, and can realize elliptic function filtering characteristics only through two resonant units. Compared with the existing technical solution of introducing cross-coupling using three resonators, the filter order is reduced, the insertion loss is lower, and the size is smaller; the position of the transmission zero point generated by the hybrid electromagnetic coupling is controllable: within the passband frequency range, when the electric coupling is greater than the magnetic coupling, the transmission zero point will be generated on the right side of the passband; when the electric coupling is less than the magnetic coupling, the transmission zero point will be generated on the left side of the passband; the all-dielectric filter proposed by the present invention can generate hybrid electromagnetic coupling between two resonant units in the case of only a main coupling path to realize elliptic function filtering characteristics, improve the passband selection characteristics of the all-dielectric filter, and has the characteristics of smaller size, simpler structure, and convenient processing.

[0035] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A hybrid electromagnetic coupled all-dielectric filter, characterized in that: Included are: filter body; At least two dielectric resonance units are distributed on the filter body; Two input and output ports are provided on the filter body and are respectively connected to the head and tail of at least two of the dielectric resonant units; at least one coupling window, formed by the connection intervals between the dielectric resonant units, for generating magnetic coupling; At least one electrical coupling blind hole, disposed in at least one coupling window for generating electrical coupling; The coupling window is provided with at least one through hole for separating the electrical coupling and the magnetic coupling; A tuning blind hole for adjusting the resonant frequency is arranged on the top of the dielectric resonance unit, and the two input and output ports are respectively connected to the head and tail bottoms of at least two of the dielectric resonance units.

2. The hybrid electromagnetic coupled all-dielectric filter according to claim 1, characterized in that: The through hole is a circular hole or an elongated hole.

3. The hybrid electromagnetic coupled all-dielectric filter according to claim 1, characterized in that: The tuning blind hole and / or the electrical coupling blind hole are cylindrical or prismatic.

4. The hybrid electromagnetic coupled all-dielectric filter according to claim 1, characterized in that: The filter body is made of dielectric material.

5. The hybrid electromagnetic coupled all-dielectric filter according to claim 4, characterized in that: The filter body is made of ceramic material.

6. The hybrid electromagnetic coupled all-dielectric filter according to claim 1, characterized in that: A metal plating layer is attached to the outer surface of the filter body.

7. The hybrid electromagnetic coupled all-dielectric filter according to claim 6, characterized in that: The metal plating layer is a silver plating layer.

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