Title :
Dual mode coupling by square corner cut in resonators and filters
Author :
Xiao-Peng Liang ; Zaki, K.A. ; Atia, A.E.
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
Abstract :
A novel method for realization of dual mode coupling in rectangular waveguide cavities is described and analyzed. This method completely replaces the coupling screw, and therefore can be used to eliminate the need for tuning in dual mode waveguide cavity filters. It also offers a wide range of coupling values and can achieve higher power handling capability than coupling screws. The mode matching method is used to calculate the mode chart of the infinite corner cut rectangular waveguide, the field distributions of each mode, and the resonant frequencies of the cavity. The dual mode coupling parameter is calculated from resonant frequencies and is verified by measurements. A C-band four-pole dual mode elliptic function rectangular waveguide cavity filter using the new coupling method was constructed and tested. The experimental results showed excellent agreement with theory.<>
Keywords :
cavity resonators; microwave filters; passive filters; rectangular waveguides; waveguide components; waveguide theory; C-band; coupling screw elimination; dual mode coupling; dual mode waveguide cavity filters; experimental results; field distributions; filters; higher power handling capability; infinite corner cut rectangular waveguide; mode chart; mode matching method; range of coupling values; rectangular waveguide cavities; resonant frequencies; resonators; square corner cut; waveguide cavity filter; Costs; Dielectric measurements; Educational institutions; Fasteners; Mode matching methods; Production; Rectangular waveguides; Resonant frequency; Resonator filters; Testing;
Conference_Titel :
Microwave Symposium Digest, 1992., IEEE MTT-S International
Conference_Location :
Albuquerque, NM, USA
Print_ISBN :
0-7803-0611-2
DOI :
10.1109/MWSYM.1992.188248
