Title :
Rigorous analysis of effect of input-output direct coupling on triple-mode third-order Chebyshev bandpass filter
Author :
Chua, Lye Heng ; Mirshekar-Syahkal, Dariush
Author_Institution :
Dept. of Electron. Syst. Eng., Essex Univ., Colchester, UK
Abstract :
An equivalent circuit for the triple-mode third-order Chebyshev response filter is proposed which includes the direct-coupling between the input and output ports. Based on this structure, the existence of a transmission zero for the filter is established through mathematical expressions derived for the computation of the zero. To verify the accuracy of the theoretical transmission zero, a triple-mode Chebyshev filter with a centre frequency at 1.713 GHz and bandwidth of 60 MHz, is designed and implemented, using a dielectric loaded cubical cavity resonator. Very close agreement between the computed and measured results of the filter is achieved.
Keywords :
Chebyshev filters; UHF filters; band-pass filters; dielectric resonator filters; electromagnetic coupling; equivalent circuits; poles and zeros; 1.713 GHz; 60 MHz; centre frequency; dielectric loaded cubical cavity resonator; direct input-output ports coupling; equivalent circuit; filter bandwidth; input-output direct coupling effect analysis; mathematical expressions; transmission zero computation; triple-mode third-order Chebyshev bandpass filter; Band pass filters; Bandwidth; Cavity resonators; Chebyshev approximation; Coupling circuits; Dielectrics; Equivalent circuits; Filtering theory; Frequency; Resonator filters;
Conference_Titel :
Microwave Conference, 2003. 33rd European
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMC.2003.1262247
