Laminated dielectric filter

Abstract

A stacked dielectric filter includes a filter section (20) which has first and second input side resonant electrodes (16a, 16b) and first and second output side resonant electrodes (18a, 18b) of two 1 / 4 wavelength resonators, a converting section (28) which has a plurality of strip lines (22, 24, 26), and a connecting section (30) which connects the filter section (20) and the converting section (28), wherein the filter section (20), the converting section (28), and the connecting section (30) are formed in a dielectric substrate (14). The filter section (20) is formed at an upper portion in the stacking direction of dielectric layers. The converting section (28) is formed at a lower portion in the stacking direction. The connecting section (30) is formed between the filter section (20) and the converting section (28).

Description

technical field

[0001] The present invention relates to a laminated dielectric filter constituting a resonant circuit in the microwave frequency band of several hundred MHz to several GHz. More specifically, the present invention relates to a laminated dielectric filter that makes it possible to effectively miniaturize a communication device and an electronic device. Background of the invention

[0002] In recent years, it has been extremely desired to realize a compact and thin high-frequency filter to be used in a wireless communication device. Therefore, it is indispensable to use a laminated dielectric filter.

[0003] Generally, such as Figure 30 As shown, this laminated dielectric filter, for example, a laminated dielectric filter 400 using a 1 / 4 wavelength resonator has a plurality of resonant electrodes 402, 404, inner layer ground electrodes 406, 408, 410, 412, and a coupling adjustment electrode 414. Each of the plurality of resonant electrodes 402, 404 has one...

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