Huawei Technologies Co., Limited

Zheng Cui

Dan Liang

Xiaofeng Zhang

Yuntao Zhu

Damiao Wu

Huanqing Zhang

A dielectric filter, a duplexer, and a communications device are provided. The dielectric filter includes a dielectric body, and a wideband filtering structure and a narrowband filtering structure that are disposed in the dielectric body. The wideband filtering structure includes a groove disposed on a first surface of the dielectric body and configured to adjust a frequency position of a passband of the wideband filtering structure; and at least one first resonator including a through hole penetrating the bottom of the groove and a second surface of the dielectric body; and an open loop located on a bottom surface of the groove and is disposed around an opening of the through hole. The narrowband filtering structure includes at least one second resonator including a blind hole disposed on the second surface of the dielectric body. The first surface and the second surface of the dielectric body are disposed oppositely.

Dielectric filter, duplexer, and communications device

This application provides an example dielectric filter and an example communications device. The dielectric filter includes a dielectric block. At least two resonant through holes that are parallel to each other are provided in the dielectric block. The resonant through hole is a stepped hole. The stepped hole includes a large stepped hole and a small stepped hole that are arranged coaxially and that are in communication. The small stepped hole passes through a first surface of the dielectric block. The large stepped hole passes through a second surface of the dielectric block. A stepped surface is formed between the large stepped hole and the small stepped hole. The surfaces of the dielectric block are covered with conductor layers. The conductor layers cover the surfaces of the dielectric block and inner walls of the large stepped hole and the small stepped hole. A conductor layer of the inner wall of the large stepped hole is short-circuited with a conductor layer of the second surface. A conductor layer of the inner wall of the small stepped hole is short-circuited with a conductor layer of the first surface. A loop gap that does not cover the conductor layers is provided on the stepped surface. The loop gap is arranged around the small stepped hole.

Dielectric filter and communications device

This disclosure describes a dielectric filter and a communications device. In one example, the dielectric filter includes at least two dielectric resonators, a first through-hole is disposed between at least one pair of adjacent dielectric resonators, and the first through-hole is configured to cut a magnetic field between the at least one pair of adjacent dielectric resonators. In some implementations, a magnetic field distribution in the dielectric filter may be cut via the first through-hole, so that a magnetic field distribution area is reduced, and a high-order harmonic wave frequency can be increased, thereby improving a remote suppression capability and meeting the specification requirements.

Examples of cavity resonators, filters, and communications devices are described. One example of cavity resonator includes a cover, a resonant column, and a cavity. The cover is mounted at an opening of a top portion of the cavity. The resonant column is disposed at a bottom portion of the cavity. A value of distributed capacitance is changed with a distance between the cover and the resonant column, a value of distributed inductance is changed with a distance between the cavity and the resonant column, and a material of at least one of the cover, the resonant column, and the cavity is a plastic metal material. Therefore, when the at least one of the cover, the resonant column, or the cavity deforms, the value of the distributed capacitance or the distributed inductance is changed, to adjust a resonant frequency.

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Dongguan, China

Zheng Cui