Title :
High-suppression three-pole tunable band-pass filter using square open-loop resonator
Author :
Liu, Jing ; Zhu, Xiaowei ; Quyen, Luong Ngoc ; You, Chanjiang
Author_Institution :
State Key Lab. of Millimeter Waves, Southeast Univ., Nanjing, China
Abstract :
Tunable band-pass filters using microstrip square open-loop resonator have been developed at 698-802 MHz band in this paper, which show steep skirt frequency response and narrow relative bandwidth. The microstrip square open-loop resonator is employed in the three-pole tunable filter design. The testing results show the developed varactor tuned filter has a 1- dB relative bandwidth of 2.1% with an insertion loss of 10-12.5 dB, the typical attenuation in stop band is 10-15 dB higher than that of the two-pole filter, which lead to a better performance in side band rejection for the application to Cognitive Radio system.
Keywords :
band-pass filters; cognitive radio; microstrip resonators; band rejection; cognitive radio system; frequency 698 MHz to 802 MHz; high-suppression three-pole tunable band-pass filter; insertion loss; loss 10 dB to 12.5 dB; microstrip square open-loop resonator; narrow relative bandwidth; steep skirt frequency response; varactor tuned filter; Band pass filters; Couplings; Filtering theory; Magnetic separation; Microstrip filters; Microwave filters; Resonator filters;
Conference_Titel :
Antennas and Propagation (APSURSI), 2011 IEEE International Symposium on
Conference_Location :
Spokane, WA
Print_ISBN :
978-1-4244-9562-7
DOI :
10.1109/APS.2011.6058708
