Title :
Simplified analysis of inhomogeneous dielectric block combline filters
Author_Institution :
R. Levy Associates, La Jolla, CA, USA
Abstract :
Dielectric block combline filters constructed of low-loss temperature stable high dielectric constant ceramic materials are used in very large quantities for mobile communications. An inhomogeneous version having significant advantages in terms of achievable Q factor and symmetry of response characteristics was introduced by A. Fukasawa (1982). An analysis of this structure which clearly depicts its novel aspects by giving a physically significant equivalent circuit is presented. A simple theory for combline filters have full quarter-wavelength resonators is outlined. In addition to improved understanding, the simplification could lead to wider utilization of such inhomogeneous structures and stimulate advances in the technology.<>
Keywords :
Q-factor; equivalent circuits; filtering and prediction theory; microwave filters; passive filters; waveguide components; waveguide theory; Q factor; analysis; equivalent circuit; high dielectric constant ceramic materials; inhomogeneous dielectric block combline filters; quarter-wavelength resonators; symmetry of response characteristics; Ceramics; Coupling circuits; Dielectric losses; Equivalent circuits; High-K gate dielectrics; Magnetic separation; Metallization; Nonuniform electric fields; Resonator filters; Temperature;
Conference_Titel :
Microwave Symposium Digest, 1990., IEEE MTT-S International
Conference_Location :
Dallas, TX
DOI :
10.1109/MWSYM.1990.99541
