Title :
A novel compact LC resonator-based bandpass filter design with tunable transmission zeros
Author :
Chen, C.-H. ; Huang, C.-H. ; Horng, T.S. ; Wu, S.-M. ; Chen, J. ; Chiu, C.T. ; Hung, C.P.
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-sen Univ., Kaohsiung
Abstract :
In this paper, the proposed LC resonator-based bandpass filter embedded in a two-layer substrate is presented to achieve both miniaturization and transmission-zero creation for 3.5 GHz WiMAX applications. There are two extra transmission zeros generated near the passband for a 2nd order design without introducing either a cross-coupling mechanism between adjacent resonators or a source-load coupling configuration in the input and output ports. The proposed LC resonator-based bandpass filter is compact in size and can achieve excellent insertion and return loss characteristics in the passband. A novel approach for tunable transmission zeros is also proposed. This approach is to groove a slot of rectangular C shape on the ground plane without additional components or devices.
Keywords :
WiMax; band-pass filters; microwave filters; poles and zeros; resonator filters; LC resonator-based bandpass filter; WiMAX; cross-coupling mechanism; frequency 3.5 GHz; microwave filters; rectangular C shape slot; source-load coupling configuration; tunable transmission zeros; two-layer substrate; Band pass filters; Capacitors; Filtering theory; Inductors; Insertion loss; Passband; Resonator filters; Substrates; Transmission lines; Tunable circuits and devices;
Conference_Titel :
Microwave Conference, 2008. APMC 2008. Asia-Pacific
Conference_Location :
Macau
Print_ISBN :
978-1-4244-2641-6
Electronic_ISBN :
978-1-4244-2642-3
DOI :
10.1109/APMC.2008.4957930
