Title :
Planar filter design with fully controllable second passband
Author :
Tsai, Chih-Ming ; Lee, Hong-Ming ; Tsai, Chin-Chuan
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Abstract :
New designs of the dual-band filter realized by distributed circuits are studied in this paper. Series and parallel open stubs are used as the resonators to fulfil the dual-band characteristics. Two dual-band inverters are proposed, which can be easily merged with adjacent resonators to reduce the circuit size. All the theoretical analysis and design procedures are discussed in detail and have been successfully verified by experiment results.
Keywords :
band-pass filters; coupled transmission lines; distributed parameter filters; resonant invertors; resonators; adjacent resonator; coupled transmission line; distributed circuit; distributed parameter filter; dual-band characteristic; dual-band filter; dual-band inverter; fully controllable second passband; immittance inverter; parallel open stub; planar filter design; series open stub; transmission-line resonator; Band pass filters; Bandwidth; Circuits; Dual band; Filtering theory; Impedance; Inverters; Passband; Resonant frequency; Resonator filters; Coupled transmission lines; distributed parameter filters; immittance inverters; transmission-line resonators;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2005.855739
