Title :
Dual-band step-impedance bandpass filter for multimode wireless LANs
Author :
Chang, Sheng-Fuh ; Jeng, Yng-Huey ; Chen, Jia-Liang
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Cheng Univ., Ming-Hsiung, Taiwan
Abstract :
A step-impedance bandpass filter is presented for multimode wireless LANs. The filter has a new dual-band feature of two tunable passbands at desired frequencies and high out-of-band suppression, generated by incorporating step-impedance resonators in a comb-filter topology. It saves more than half the circuit size compared with the switch-type dual-band topology. The simulation and measurement results show the dual-band feature of two passbands at 2.45 and 5.75 GHz with 85 dB suppression at 3.5 GHz.
Keywords :
UHF filters; band-pass filters; cellular radio; comb filters; microstrip filters; microwave filters; resonator filters; transceivers; wireless LAN; 2.45 GHz; 3.5 GHz; 5.75 GHz; RF transceivers; comb-filter topology; dual-band feature; filter simulation; high out-of-band suppression; microstrip filter; multimode wireless LAN; step-impedance bandpass filter; step-impedance resonators; tunable passbands;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20040065
