Title :
Design optimization of microstrip square-ring band-pass filter with quasi-elliptic function
Author :
Hennings, A. ; Semouchkin, G. ; Semouchkina, E. ; Lanagan, Michael
Author_Institution :
RWTH, Aachen, Germany
Abstract :
Resonant processes in dual-mode microstrip square-ring band-pass filter fed through L-shaped coupling arms have been studied using the finite difference time domain (FDTD) simulations. The performed field analysis has revealed that coupling arms act as additional half-wavelength resonators coupled with the ring through both electric and magnetic fields. New filter designs with horseshoe resonators instead of coupling arms have been developed, which provide either pure magnetic or electric coupling at the resonant frequency. The obtained results demonstrate the possibility to essentially improve filter characteristics. Simulation results have been verified by the measurements of fabricated prototypes.
Keywords :
band-pass filters; cavity resonator filters; circuit simulation; computational electromagnetics; electromagnetic coupling; elliptic filters; finite difference time-domain analysis; microstrip filters; FDTD simulations; L-shaped coupling arms; coupled electric fields; coupled magnetic fields; design optimization; dual-mode microstrip square-ring band-pass filter; field analysis; filter characteristics; filter designs; finite difference time domain simulations; half-wavelength resonators; horseshoe resonators; microstrip square-ring band-pass filter; prototypes; quasi-elliptic function; resonant frequency coupling; resonant processes; simulations; Arm; Band pass filters; Couplings; Design optimization; Finite difference methods; Magnetic field measurement; Magnetic resonance; Magnetic separation; Microstrip filters; Resonator filters;
Conference_Titel :
Microwave Conference, 2003. 33rd European
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMC.2003.1262246