An all-dielectric hybrid resonance structure and filter

Abstract

The present invention discloses an all-dielectric hybrid resonance structure and filter, which comprises a single cavity block and a dielectric resonance rod arranged in the single cavity block, wherein the single cavity block is an all-dielectric single cavity block, and the dielectric resonance rod comprises a coaxially arranged middle resonance unit and an end resonance unit, at least one end resonance unit is arranged at each of the two ends of the middle resonance unit, the dielectric constant of the middle resonance unit is greater than the dielectric constant of the end resonance unit, and the dielectric constant of the middle resonance unit is greater than the dielectric constant of the all-dielectric single cavity block. The present invention is not only simple in structure, but also can meet the requirements of cavity dielectric filters for higher Q value and smaller volume.

Description

Technical Field

[0001] The invention relates to a resonant structure and a filter, belonging to the technical field of passive antenna feed devices in the field of wireless network communications, and in particular to an all-dielectric hybrid resonant structure and a filter for a filter. Background Art

[0002] With the rapid development of the fourth generation of mobile communications to the fifth generation of mobile communications, the requirements for high performance and miniaturization of communication equipment are increasing, and the use of dielectric filters has gradually become more frequent. Traditional TM mode dielectric filters mostly use a single dielectric constant resonance method, and a single dielectric resonator is grounded up and down to compress the volume in the height direction. However, since the Q value after volume compression is not superior to that of metal cavity filters of the same volume, the insertion loss of the filter has not been reduced even though the dielectric resonator is used. Summary of the invention

[0003] In view of the defects of the above-mentioned prior art, the purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide an all-dielectric hybrid resonant structure and filter, which not only has a simple structure but also can meet the requirements of cavity dielectric filters for higher Q value and smaller volume.

[0004] In order to solve the above technical problems, the present invention adopts such an all-dielectric hybrid resonance structure for a filter, which includes a single cavity block and a dielectric resonance rod arranged in the single cavity block, the single cavity block is an all-dielectric single cavity block, the dielectric resonance rod includes a coaxially arranged middle resonance unit and an end resonance unit, at least one end resonance unit is arranged at each of the two ends of the middle resonance unit, the dielectric constant of the middle resonance unit is greater than the dielectric constant of the end resonance unit, and the dielectric constant of the middle resonance unit is greater than the dielectric constant of the all-dielectric single cavity block.

[0005] In a preferred embodiment of the present invention, the numbers of the end resonance units arranged at both ends of the middle resonance unit correspond to each other.

[0006] In a preferred embodiment of the present invention, at least two end resonance units are provided at each end of the intermediate resonance unit, and the dielectric constant of the end resonance unit close to the intermediate resonance unit is greater than the dielectric constant of the end resonance unit far from the intermediate resonance unit.

[0007] In a preferred embodiment of the present invention, the length of the middle resonance unit is greater than the length of the end resonance unit.

[0008] In a preferred embodiment of the present invention, the intermediate resonance unit and the end resonance unit are in close contact, or the intermediate resonance unit and the end resonance unit are formed in a split structure, and the intermediate resonance unit and the end resonance unit are spliced ​​into an integral structure.

[0009] In a preferred embodiment of the present invention, the dielectric resonance rod is configured as a cylinder, a cube or a cuboid, and the interior thereof is configured to be hollow, or the center thereof is configured to be a through hole or a blind hole.

[0010] In a preferred embodiment of the present invention, the all-medium single-cavity block is configured as a cylinder, a cube or a cuboid.

[0011] In a preferred embodiment of the present invention, the dielectric resonance rod is filled in the inner hole of the all-dielectric single cavity block and is bonded or press-connected to the all-dielectric single cavity block.

[0012] The present invention also discloses a filter equipped with an all-dielectric hybrid resonance structure, including a cavity, a cover plate and a coupling tuning screw, wherein the cover plate is arranged above the cavity, the coupling tuning screw is arranged in the cavity, and a plurality of dielectric resonators are arranged in the cavity, characterized in that: the dielectric resonator is a all-dielectric hybrid resonance structure.

[0013] The beneficial effects of the present invention are as follows: the present invention has a simple structure and is easy to install and use. By designing the single cavity block as a full-dielectric single cavity block and making the dielectric resonance rod into a segmented structure, and by ensuring that the dielectric constant of the dielectric resonance rod of the middle segment is greater than the dielectric constant of the dielectric resonance rod of the other segments and the dielectric constant of the full-dielectric single cavity block, the single cavity Q value can be effectively improved without changing the other structures of the existing resonator. Compared with the traditional TM single dielectric constant resonator, the Q value is improved by more than 10%, and compared with the traditional TM single mode, this method can form dual-mode and multi-mode under a specific shape and size combination, and the volume is greatly reduced by 1 / 3 or even more compared with the TM double-end grounded single dielectric constant resonator; at the same time, the present invention can adjust the number of end resonance units at both ends of the middle resonance unit as needed while maintaining the total height of the resonance rod, thereby effectively adjusting the size of the Q value; the present invention facilitates the positioning and assembly of the dielectric resonance rod by integrally processing the middle resonance unit and the end resonance unit, and by using the split processing method for the middle resonance unit and the end resonance unit The Q value of the dielectric resonant rod is controlled; the shapes of the middle resonant unit and the end resonant unit of the present invention can be cylinders, cuboids, cubes, etc., or a combination of the above shapes; in order to meet the requirements of ambient temperature changes and reliability, the material properties of the middle resonant unit can be adjusted to perform temperature compensation, so that its electrical performance is more stable under full temperature conditions. In order to enhance the reliability of this structure, the end resonant unit can use elastic materials so that it will not fail due to different expansion coefficients of different materials when the ambient temperature changes rapidly; a filter with a mixed dielectric resonant structure disclosed in the present invention has a cavity inner wall made of metal, which can be made of aluminum, copper, steel, etc., or can be made of non-metallic materials such as plastics and composite materials, and the cavity inner wall can be made conductive by electroplating silver or copper; after simulation, the electric field strength is the largest on the side of the cavity. In a long-term high temperature and high power environment, it can be considered to add a heat dissipation device on the side of the cavity. The heat dissipation teeth can be die-casted into one with the cavity, or a heat sink can be arranged separately outside the cavity to reduce the temperature inside and outside the entire cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is an exploded view of an all-dielectric hybrid resonance structure according to an embodiment of the present invention;

[0015] Figure 2 This is a front view of an all-dielectric hybrid resonance structure according to an embodiment of the present invention;

[0016] Figure 3 is a cross-sectional view of an all-dielectric hybrid resonance structure according to an embodiment of the present invention;

[0017] Figure 4 It is a top view of an all-dielectric hybrid resonance structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] 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 used to limit the present invention.

[0019] It can be seen from the structural schematic diagram of an all-dielectric hybrid resonance structure shown in the accompanying drawings of the specification of the present invention that the present invention includes a single cavity block and a dielectric resonance rod 1 arranged in the single cavity block, the single cavity block is an all-dielectric single cavity block 4, five sides of the all-dielectric single cavity block 4 are coated with silver, one side of which is not coated with silver, and a circuit can be printed on this side for signal input and output and frequency and coupling adjustment, the dielectric resonance rod 1 includes a coaxially arranged middle resonance unit 2 and an end resonance unit 3, the single cavity block is an all-dielectric single cavity block 4, the middle resonance unit 2 and the end resonance unit 3 can be made of materials with different dielectric constants, such as ceramics, plastics, etc., at least one end resonance unit 3 is arranged at each end of the middle resonance unit 2, the dielectric constant of the middle resonance unit 2 is greater than the dielectric constant of the end resonance unit 3, and the dielectric constant of the middle resonance unit 2 is greater than the dielectric constant of the all-dielectric single cavity block 4. It should be pointed out that, under the premise of ensuring the middle resonant unit 2 and maintaining the total height of the dielectric resonant rod 1, the end resonant units 3 can be configured at both ends of the middle resonant unit 2 according to the size of the Q value. Generally, the end resonant units 3 at both ends of the middle resonant unit 2 are symmetrically arranged and symmetrically increased, but the end resonant unit 3 at one end can also be divided into multiple segments. The above technical solutions all belong to the protection scope of the present invention. At the same time, the dielectric constants of all the end resonant units 3 are smaller than the dielectric constant of the middle resonant unit 2, the lengths of all the end resonant units 3 are smaller than the length of the middle resonant unit 2, the dielectric constant of the end resonant unit 3 close to the middle resonant unit 2 is greater than the dielectric constant of the end resonant unit 3 far away from the middle resonant unit 2, and so on. The dielectric constant of the end resonant unit 3 in contact with the bottom of the cavity and the inner surface of the cover plate is the smallest.

[0020] The molding of the dielectric resonance rod 1 includes two schemes: 1. Integrated scheme: the middle resonance unit 2 and the end resonance unit 3 are molded with an integrated structure, that is, they are molded by integral casting using a mold, and the change of the dielectric constant of each unit is formed by adding materials with different dielectric constants at specified positions in the mold.

[0021] 2. Split-type solution: The middle resonant unit 2 and the end resonant unit 3 are formed by a split-type structure, and the middle resonant unit 2 and the end resonant unit 3 are connected to form an integral structure by splicing.

[0022] Whether it is an integrated solution or a split solution, the all-dielectric single cavity block 4, the middle resonance unit 2 and the end resonance unit 3 can all be in one of the shapes of a cylinder, a cuboid and a cube. At the same time, each shape of the middle resonance unit 2 and the end resonance unit 3 can be solid or hollow. The all-dielectric single cavity block 4 and the resonance rod shape can be cross-combined, such as a cylindrical dielectric rod installed in a cuboid or cube single cavity; or a cuboid dielectric rod installed in a cuboid or cube single cavity, etc. There is air between the dielectric combination resonance rod and the inner wall of the cavity, and the dielectric rod and the single cavity can form dual-mode and multi-mode under specific sizes and shapes; the dielectric constants of the materials of the middle resonance unit 2 and the end resonance unit 3 are different; the middle resonance unit 2 is a solid cylindrical or hollow sleeve. The end resonance unit 3 is a solid cylindrical or hollow sleeve. The end resonance unit 3 is made of dielectric material, preferably elastic material. The dielectric resonance rod 1 is filled in the inner hole of the all-dielectric single cavity block 4 and bonded or crimped to the all-dielectric single cavity block 4 . The end resonance units 3 located at both ends of the dielectric resonance rod 1 are flush with the end surface of the all-dielectric single cavity block 4 .

[0023] The present invention also discloses a filter equipped with a hybrid dielectric resonant structure, including a cavity 4, a cover plate 5 and a coupling tuning screw 6, wherein the cover plate 5 is arranged above the cavity 4, the coupling tuning screw 6 is arranged in the cavity 4, a plurality of dielectric resonators are arranged in the cavity 4, and the dielectric resonator is a full dielectric hybrid resonant structure for the filter, the lower end face of the hybrid dielectric resonant structure is in close contact with the bottom of the cavity 4, and the upper end face of the hybrid dielectric resonant structure is in close contact with the cover plate 5. The inner wall of the cavity 4 is metal, and the material can be aluminum, copper, steel, etc., or non-metallic materials such as plastics and composite materials can be used to make the inner wall of the cavity have conductive properties by electroplating silver, copper, etc. The electric field intensity on the side of the cavity 4 is the largest. In a long-term high temperature and high power environment, it can be considered to add a heat dissipation device on the side of the cavity, and the heat dissipation teeth can be die-casted integrally with the cavity, or a heat sink can be arranged separately outside the cavity to reduce the temperature inside and outside the entire cavity.

[0024] The cover plate structure of the patent of the present invention can overcome the above defects. Through the upper and lower combination structure of two dielectric rods with different dielectric constants, the single-cavity Q value can be greatly improved. Compared with the traditional TM single dielectric constant resonator, the Q value is increased by more than 10%. In addition, compared with the traditional TM single mode, this method can form dual-mode and multi-mode under specific shape and size combinations. Compared with the TM double-ended grounded single dielectric constant resonator, the volume is greatly reduced by 1 / 3 or even more.

[0025] In implementation case 1, when the size of a single cavity is 20*20*20, the dielectric constant of the full dielectric block is 43, the dielectric constants of dielectric rods 1 and 3 are 1.5, the dielectric constant of dielectric rod 2 is 80, and the diameter of the three dielectric rods is 18.5, at a frequency of 1800MHz, the Q value of the dielectric hybrid single cavity is close to 10000, and it is a degenerate dual-mode.

[0026] The Q value of the all-dielectric hybrid resonant single cavity achieved by the above method is greater than 10% or more compared with the TEM mode resonant single cavity with the same volume and frequency.

[0027] In implementation case 2, in a single cavity with a size of 20*20*20, a dielectric constant of the entire dielectric block of 43, dielectric constants of dielectric rods 1 and 3 of 3, dielectric constants of dielectric rods 4 and 5 of 1, dielectric constants of dielectric rod 2 of 80, and a diameter of the five dielectric rods of 18.5, at a frequency of 1800MHz, the Q value of the dielectric hybrid single cavity is close to 10000, and it is a degenerate dual-mode. The Q value tested by this implementation plan is not much different from the Q value tested by implementation plan 1, but the cost and complexity of assembly will increase.

[0028] The Q value of the all-dielectric hybrid resonant single cavity achieved by the above method is greater than 10% or more compared with the TEM mode resonant single cavity with the same volume and frequency.

[0029] It should be understood that the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a technician familiar with the field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An all-dielectric hybrid resonance structure, comprising a single cavity block and a dielectric resonance rod (1) arranged in the single cavity block, characterized in that: The single cavity block is a full-dielectric single cavity block (4); the dielectric resonant rod (1) comprises a coaxially arranged middle resonant unit (2) and an end resonant unit (3); the end resonant units (3) are arranged at both ends of the middle resonant unit (2); the dielectric constant of the middle resonant unit (2) is greater than the dielectric constant of the end resonant unit (3); the dielectric constant of the middle resonant unit (2) is greater than the dielectric constant of the all-dielectric single cavity block (4); the number of the end resonant units (3) arranged at both ends of the middle resonant unit (2) is corresponding; at least two end resonant units (3) are arranged at each end of the middle resonant unit (2); the dielectric constant of the end resonant unit (3) close to the middle resonant unit (2) is greater than the dielectric constant of the end resonant unit (3) far from the middle resonant unit (2).

2. The all-dielectric hybrid resonant structure according to claim 1, characterized in that: The length of the middle resonance unit (2) is greater than the length of the end resonance unit (3).

3. The all-dielectric hybrid resonant structure according to claim 1, characterized in that: The middle resonance unit (2) and the end resonance unit (3) are in close contact.

4. The all-dielectric hybrid resonant structure according to claim 3, characterized in that: The middle resonance unit (2) and the end resonance unit (3) are formed by a split structure, and the middle resonance unit (2) and the end resonance unit (3) are spliced ​​into an integral structure.

5. The all-dielectric hybrid resonant structure according to claim 1, characterized in that: The dielectric resonance rod (1) is configured as a cylinder, a cube or a cuboid, and its interior is configured to be hollow.

6. The all-dielectric hybrid resonant structure according to claim 5, characterized in that: The dielectric resonance rod (1) is configured as a cylinder, a cube or a cuboid, and the interior thereof is configured as a through hole or a blind hole at the center.

7. The all-dielectric hybrid resonant structure according to claim 1, characterized in that: The all-medium single-cavity block (4) is configured as a cylinder, a cube or a cuboid.

8. The all-dielectric hybrid resonant structure according to claim 1, characterized in that: The dielectric resonance rod (1) is filled in the inner hole of the all-dielectric single cavity block (4) and is bonded or crimped to the all-dielectric single cavity block (4).

9. A filter equipped with an all-dielectric hybrid resonance structure comprises a cavity, a cover plate and a coupling tuning screw, wherein the cover plate is arranged above the cavity, the coupling tuning screw is arranged in the cavity, and a plurality of dielectric resonators are arranged in the cavity, characterized in that: The dielectric resonator is an all-dielectric hybrid resonance structure as described in any one of claims 1-8.

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