Distributed Coupling of Dual-Modes in a Circular Resonator and Low-Profile Dielectric Disk Resonator BPF

Ikuo AWAI  Arun Chandra KUNDU  

IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.2   pp.393-401
Publication Date: 1999/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwave and Millimeter Wave Technology
distributed coupling,  dual-mode,  high permittivity dielectric,  disk resonator,  low-profile filter,  transmission line model,  

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A novel method is proposed to calculate the distributed coupling of dual-modes in a circular resonator. New theoretical expressions are devised to accumulate the infinitesimal coupling between orthogonal modes and their validity is justified by the FD-TD analysis and experiments. The distributed coupling concept of a circular disk resonator is applied to a square disk resonator to calculate its resonant frequency. We have fabricated two types of low-profile dual-mode square dielectric disk resonator BPF, using high dielectric constant material (εr = 93) having a dimension of 5 mm 5 mm 1 mm. The filter characteristics are explained by the transmission line circuit model.