US 11,735,801 B2
High-q triple-mode cavity dielectric resonant hollow structure and filter with resonant structure
Qingnan Meng, Hubei (CN)
Assigned to HONGKONG FINGU DEVELOPMENT COMPANY LIMITED, Hong Kong (CN)
Appl. No. 17/267,509
Filed by HONGKONG FINGU DEVELOPMENT COMPANY LIMITED, Hong Kong (CN)
PCT Filed Dec. 29, 2018, PCT No. PCT/CN2018/125165
§ 371(c)(1), (2) Date Feb. 10, 2021,
PCT Pub. No. WO2020/048064, PCT Pub. Date Mar. 12, 2020.
Claims priority of application No. 201811026913.5 (CN), filed on Sep. 4, 2018.
Prior Publication US 2021/0320391 A1, Oct. 14, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H01P 7/10 (2006.01); H01P 1/213 (2006.01); H01P 7/06 (2006.01)
CPC H01P 1/2138 (2013.01) [H01P 7/06 (2013.01); H01P 7/105 (2013.01)] 39 Claims
OG exemplary drawing
 
1. A high-Q triple-mode cavity dielectric resonant hollow structure for a filter, comprising a cavity and a cover plate, wherein the cavity is internally provided with a dielectric resonant block and a dielectric support frame; the dielectric resonant block takes a cube-like shape and is internally provided with a hollow chamber; the dielectric support frame is connected with the dielectric resonant block and an inner wall of the cavity, respectively; the dielectric resonant block and the dielectric support frame form a triple-mode dielectric resonator; a dielectric constant of the dielectric support frame is smaller than a dielectric constant of the dielectric resonant block; the hollow chamber is of a cube-like shape; when a ratio of size of the single side of the dielectric resonant block to a size of a corresponding single side of the hollow chamber is greater than 6, the transited Q value of the base mode remains generally unchanged, and when the ratio of the single side of the dielectric resonant block to the size of the corresponding single side of the hollow chamber is smaller than 6, the transited Q value of the base mode is greatly decreased;
a ratio K of a size of a single side of the inner wall of the cavity to a size of a corresponding single side of the dielectric, resonant block is: K is greater than or equal to a transition point 1 and is smaller than or equal to a transition point 2, a Q value of a higher-order mode adjacent to a base mode of a triple-mode cavity resonant structure is transited into a Q value of the base mode of the triple-mode cavity resonant structure, a base-mode resonant frequency after transition is equal to a base-mode resonant frequency prior to transition, a Q value of the base mode after transition is greater than a Q value of the base mode prior to transition, and a Q value of the higher-order mode adjacent to the base mode after transition is smaller than a Q value of the higher-order mode adjacent to the base mode prior to transition;
the triple-mode dielectric resonant structure is internally provided with a coupling structure for changing an orthogonal property of an electromagnetic field of a degenerate triple-mode in the cavity; and
the triple-mode dielectric resonant structure is internally provided with a frequency tuning device for changing a tuning frequency of the degenerate triple-mode in the cavity;
wherein a value of the transition point 1 and a value of the transition point 2 both vary according to different base-mode resonant frequencies of the dielectric resonant structure, dielectric constants of the dielectric resonant block and dielectric constants of the support frame;
wherein when the base-mode resonant frequency of the dielectric resonant structure after transition remains unchanged, the Q value of the triple-mode cavity resonant structure is relevant to the K value, the dielectric constant of the dielectric resonant block and the size of the dielectric resonant block;
wherein when the K value is increased to the maximum from 1.0, the K value has three Q value transition points within a variation range, each Q value transition point enables the Q value of the base mode and the Q value of the higher-order mode adjacent to the base mode to be transited; when the value of the base mode is lower than the Q value of the higher-order mode adjacent to the base mode, the Q value of the higher-order mode adjacent to the base mode is transited into the Q value of the base mode, and the Q value of the base mode is higher than that prior to transition; and when the Q value of the base-mode is higher than the Q value of the higher-order mode adjacent, to the base mode, the Q value of the higher-order mode adjacent to the base mode is transited into the Q value of the base-mode, and the Q value of the base-mode is lower than that prior to transition;
wherein in four areas formed by a start point and a final point of the K value and the three value Q transition points, the Q value of the base mode and the Q value of the higher-order mode adjacent to the base mode vary along with variation of cavity sizes and dielectric resonant block sizes, and different areas have different requirements when being applied to a filter.