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CN-224217694-U - Resonator structure and filter thereof

CN224217694UCN 224217694 UCN224217694 UCN 224217694UCN-224217694-U

Abstract

The utility model relates to a resonator structure and a filter thereof, comprising a body, a resonant cavity unit, a third resonant hole and a three-cavity cross coupling structure, wherein the resonant cavity unit comprises a first resonant cavity and a second resonant cavity which are sequentially arranged on the body along a first direction, the first resonant cavity comprises a first resonant hole, the second resonant cavity comprises a second resonant hole, the first resonant hole and the second resonant hole are positioned on the same surface of the body, the resonant cavity unit further comprises the third resonant hole, the third resonant hole is arranged on the side surface of the body, the third resonant hole is positioned between the first resonant cavity and the second resonant cavity, and the first resonant hole, the second resonant hole and the third resonant hole are matched to form the three-cavity cross coupling structure.

Inventors

  • LIU YADONG

Assignees

  • 苏州捷频电子科技有限公司

Dates

Publication Date
20260508
Application Date
20250328

Claims (5)

  1. 1. A resonator structure is characterized by comprising, A body; The resonant cavity unit comprises a first resonant cavity and a second resonant cavity which are sequentially arranged on the body along a first direction, wherein the first resonant cavity comprises a first resonant hole, the second resonant cavity comprises a second resonant hole, the first resonant hole and the second resonant hole are positioned on the same surface of the body, the resonant cavity unit further comprises a third resonant hole which is arranged on the side surface of the body, the third resonant hole is positioned between the first resonant cavity and the second resonant cavity, and the first resonant hole, the second resonant hole and the third resonant hole are matched to form a three-cavity cross coupling structure; The coupling unit is arranged on the body and is positioned between the first resonant cavity and the second resonant cavity so as to adjust the coupling quantity of the first resonant cavity and the second resonant cavity; The body has opposite first and second surfaces in a thickness direction; the body also has opposed first and second sides, the first side and the second side extend in the first direction; The first resonant holes and the second resonant holes are arranged on the first surface at intervals along the first direction, the third resonant holes are arranged on the first side surface, and the depth direction of the third resonant holes is the second direction; The coupling unit comprises an isolation groove, the isolation groove is arranged on the second side face, and the isolation groove is positioned between the first resonant hole and the second resonant hole so as to adjust the coupling quantity between the first resonant hole and the second resonant hole; the projection of the isolation groove along the second direction is completely overlapped or partially overlapped with the projection of the third resonant hole along the second direction; The coupling unit comprises an adjusting hole, the adjusting hole is arranged on the first surface, and the adjusting hole is positioned between the first resonant hole and the second resonant hole so as to adjust the coupling quantity of the first resonant hole and the second resonant hole.
  2. 2. A resonator structure according to claim 1, characterized in that the projections of said first and second resonator holes in the thickness direction of said body are circular, square, oval or irregular polygonal.
  3. 3. A resonator structure according to claim 1, characterized in that the first and the second resonance holes have different depths.
  4. 4. A resonator structure according to any of claims 1-3, characterized in that said first resonator hole, said second resonator hole and said third resonator hole are blind holes.
  5. 5. A filter comprising at least one resonator structure according to any one of claims 1-4.

Description

Resonator structure and filter thereof Technical Field The utility model relates to the technical field of communication equipment, in particular to a resonator structure and a filter thereof. Background The ceramic waveguide filter is a microwave filter made of ceramic material and is mainly used for signal processing of radio frequency and microwave frequency bands. Its high dielectric constant and low loss characteristics make it excellent in high frequency applications. The filter with the two-cavity structure is a common microwave filter design, and consists of two resonant cavities, and signal filtering is realized through a coupling mechanism. The structure is simple and easy to tune, and is widely applied to radio frequency and microwave systems. The filter with the two-cavity structure is widely applied in the fields of radio frequency and microwaves because of simplicity, flexibility and high selectivity. Despite the narrow bandwidth and high manufacturing accuracy requirements, its excellent performance makes it an ideal choice for many high frequency signal processing systems. The rejection effect of the filter is generally directly related to the design order of the filter, the two-cavity structure is equivalent to a two-order filter, and in order to increase the out-of-band rejection effect of the filter in the filter design process, the passband is increased in order or cross coupling is increased under the condition that the order is unchanged, and the cross coupling is that coupling is increased between non-adjacent resonant cavities, so that the cross coupling needs at least three resonant cavities. However, the prior art has the disadvantage that the higher the order of the filter, the better the suppression effect, but the higher the order, the more the volume of the filter is increased. Therefore, there is a need to design a filter that can achieve a combination of bulk, multiple resonant modes, and rejection. Disclosure of utility model Therefore, the technical problem to be solved by the utility model is to overcome the defects in the prior art, and provide the resonator structure and the filter thereof, which can form a transmission zero point which has an enhanced inhibition effect at the high-frequency stop band of the filter passband, effectively reduce the size and the volume of the resonator and reduce the required installation space of the resonator. In order to solve the above technical problems, the present utility model provides a resonator structure, comprising, A body; The resonant cavity unit comprises a first resonant cavity and a second resonant cavity which are sequentially arranged on the body along a first direction, wherein the first resonant cavity comprises a first resonant hole, the second resonant cavity comprises a second resonant hole, the first resonant hole and the second resonant hole are positioned on the same surface of the body, the resonant cavity unit further comprises a third resonant hole which is arranged on the side surface of the body, the third resonant hole is positioned between the first resonant cavity and the second resonant cavity, and the first resonant hole, the second resonant hole and the third resonant hole are matched to form a three-cavity cross coupling structure; the coupling unit is arranged on the body and is positioned between the first resonant cavity and the second resonant cavity so as to adjust the coupling quantity of the first resonant cavity and the second resonant cavity, and an input signal enters the first resonant cavity and is transmitted to the second resonant cavity through a coupling mechanism and then is output. In one embodiment of the utility model, the body has first and second opposed surfaces in a thickness direction, and the body further has first and second opposed sides extending in the first direction. In one embodiment of the present utility model, the first resonant hole and the second resonant hole are disposed on the first surface at intervals along the first direction, the third resonant hole is disposed on the first side surface, and a depth direction of the third resonant hole is a second direction. In one embodiment of the present utility model, the coupling unit includes an isolation groove disposed at the second side surface, and the isolation groove is located between the first and second resonance holes to adjust an amount of coupling between the first and second resonance holes. In one embodiment of the present utility model, the projection of the isolation groove along the second direction and the projection of the third resonance hole along the second direction are completely overlapped or partially overlapped. In one embodiment of the present utility model, the coupling unit includes an adjustment hole provided at the first surface, and the adjustment hole is located between the first and second resonance holes to adjust the coupling amount of the first and second resonance holes. In one e