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Medium electric filter, compound medium electric filter, one-two-way duplexer and communication device

A dielectric filter and composite dielectric technology, applied in the field of filters, can solve the problems of easy mutual coupling, deterioration of attenuation characteristics, and reduction of adjacent filter isolation.

Inactive Publication Date: 2004-12-01
MURATA MFG CO LTD
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Problems solved by technology

[0006] However, in the composite dielectric filter according to the general prior art (such as Figure 8 As shown), when a plurality of dielectric filters are arranged close to each other, the electric field of the coupling loop leaked from the adjustment hole may be easily coupled with each other, thereby reducing the isolation between adjacent filters, resulting in deterioration of attenuation characteristics

Method used

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  • Medium electric filter, compound medium electric filter, one-two-way duplexer and communication device
  • Medium electric filter, compound medium electric filter, one-two-way duplexer and communication device
  • Medium electric filter, compound medium electric filter, one-two-way duplexer and communication device

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Embodiment Construction

[0023] The structure of a dielectric duplexer according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

[0024] Fig. 1 is an exploded perspective view showing the structure of one of a plurality of dielectric filters forming a dielectric diplexer. In FIG. 1, reference numeral 1 denotes each rectangular tube cavity, the upper and lower surfaces of which are opened. Inside the cavity 1 , a cross-shaped dielectric core 2 is integrally formed with the cavity 1 . On the outer surface of each cavity 1, a silver electrode or similar conductive film is formed. Reference numeral 5 denotes a lower chamber cover covering the lower surface of the cavity 1 , and reference numeral 6 denotes an upper chamber cover covering the upper surface of the cavity 1 . Both cover plates are formed from metal plates.

[0025] Reference symbols Ra, Rb and Rc denote dielectric resonators, each formed of a cavity as a unit. As will be described bel...

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Abstract

A dielectric filter, a composite dielectric filter, a dielectric duplexer, a dielectric diplexer, and a communication apparatus, in which isolation between adjacent dielectric filters can be obtained, and deterioration of filter characteristics can thereby be prevented. A plurality of dielectric resonators formed by disposing dielectric cores in cavities, and coupling loops for coupling to predetermined resonance modes of the dielectric resonators, are combined to form a dielectric filter. The dielectric resonators and the coupling loops are arranged in such a manner that when the dielectric resonators of the dielectric filters are close to each other, the directions of the coupling portions of the adjacent coupling loops are substantially vertical to each other.

Description

technical field [0001] The present invention relates to filters incorporating dielectric resonators, composite dielectric filters such as duplexers, and communication devices incorporating them. Background technique [0002] For example, a cellular base station commonly used in a mobile communication system has been employing a composite dielectric filter formed of a plurality of dielectric resonators, such as a one-way duplexer (diplexer) for transmission and a two-way duplexer for transmission and reception. Duplexer. [0003] For example, Japanese Unexamined Patent Application Publication 10-75104 provides a dielectric filter formed by using a plurality of TM dual-mode dielectric resonators. In this dielectric filter, the opening faces of the TM dual-mode dielectric resonators are aligned flush with each other. A metal panel is provided to cover the opening. In the panel, a coupling loop is formed for input / output signals and coupling between resonators. A plurality o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/20H01P1/208H01P1/213H01P7/10
CPCH01P1/2086H01P1/20
Inventor 安藤正道田中纪洋笹井英一
Owner MURATA MFG CO LTD
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