Directional filter and multiplexer

Abstract

Abstract PURPOSE:To enable two channels filters to be connected and to attain miniaturization and low insertion loss by connecting a 3dB hybrid circuit to the two input and output connectors of a dielectric resonator provided with double resonance mode, respectively. CONSTITUTION:The dielectric resonator 8 functions as two filters setting connectors 5, 5 and connectors 6, 6 as the input/output connectors. Also, since the size and shape in X and Y directions of two dielectric columns and cavities are equal, the resonance frequencies of both modes are equal, and the two filters function as channel filters with equal passing bands, respectively. One directional filter can be comprised by connecting two 3dB hybrid circuits to the dielectric resonator, and grounding the terminal T of an output side 3dB hybraid circuit 3' via a resistor. Therefore, it is possible to obtain a directional filter with sperior electrical characteristic and a multiplexer using the same, and to attain the miniaturization and light weight.

Inventors

• 👤 Toshiro Hiratsuka
• 👤 敏朗 平塚

Bibliographic Details