Title :
Compact 2-pole and 4-pole 2.4–2.8 GHz dual-mode tunable filters
Author :
Stefanini, Romain ; Chatras, Matthieu ; Blondy, Pierre ; Rebeiz, Gabriel M.
Author_Institution :
CNRS, Univ. de Limoges, Albert, France
Abstract :
Compact 2-pole and 4-pole dual-mode tunable filters have been developed to cover the 2.4-2.8 GHz bandwidth. The filters are based on magnetic coupling (2-pole) and on a mixed-mode coupling (4-pole) so as to result in a near-constant fractional bandwidth over the tuning range. An unloaded tunable filter Q of 50-130 was achieved for both designs, which is quite high when using Silicon Schottky varactor diode for the tunable elements. The filters are integrated on an εr = 10.2 substrate, are quite small, and result in relatively low insertion loss (2-6 dB) and excellent rejection. The application areas are in reconfigurable communication systems.
Keywords :
Schottky diodes; elemental semiconductors; filters; silicon; 2-pole filters; 4-pole filters; Schottky varactor diode; Si; bandwidth 2.4 GHz to 2.8 GHz; dual-mode tunable filters; loss 2 dB to 6 dB; magnetic coupling; mixed-mode coupling; reconfigurable communication systems; Bandwidth; Communication systems; Couplings; Frequency; Insertion loss; Magnetic separation; Resonator filters; Schottky diodes; Silicon; Varactors; Dual-mode; planar filters; tunable filters;
Conference_Titel :
Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4244-6056-4
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2010.5515869