Coaxial resonator, and dielectric filter, wireless communication module, and wireless communication device using the same

Abstract

Provided are a coaxial resonator as well as a dielectric filter, a wireless communication module, and a wireless communication device, using the resonator, wherein the Q value in a first resonant mode is large, and a space between a resonance frequency of the first resonant mode and a resonance frequency of a second resonant mode is large. The coaxial resonator is provided with a dielectric block, a first inner conductor arranged on the inner surface of a first through hole which is formed from a first main surface to a second main surface opposing thereto of the block, one end of the inner conductor being connected to a reference potential, and an outer conductor arranged on a side surface of the dielectric block so as to surround the first inner conductor and connected to the reference potential, wherein a low-permittivity portion having permittivity lower than that of the surrounding dielectric block is formed between the first inner conductor and the outer conductor in a manner to surround the first inner conductor. Thereby, the coaxial resonator wherein the Q value in the first resonant mode is large and the frequency space between the resonance frequency of the first resonant mode and the resonance frequency of the second resonant mode is large, can be obtained.

Description

technical field [0001] The present invention relates to a coaxial resonator with excellent electrical characteristics, a dielectric filter using the same, a wireless communication module, and a wireless communication device. Background technique [0002] As a resonator resonating at a specific frequency, there is known a coaxial resonator composed of an inner conductor arranged on the inner surface of a through hole formed in a dielectric block and an outer conductor arranged on the outer surface of the dielectric block (for example, Refer to Patent Document 1). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: JP Unexamined Patent Publication No. 1-227501 [0006] The problem to be solved by the invention [0007] However, in the conventional coaxial resonator proposed in Patent Document 1, it is difficult to increase the Q value in the first resonance mode and increase the interval between the resonance frequencies of the first resonan...

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Problems solved by technology

[0007] However, in the conventional coaxial resonator proposed in Patent Document 1, it is difficult to increase the Q value in the first re

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