Title :
Varactor-tuned coupled resonator front-end bandpass filters for cognitive radio applications
Author_Institution :
Wireless Access Res. Center of Excellence, Motorola Labs, Schaumburg, IL, USA
Abstract :
The design, implementation and measurement results of varactor-tuned, three coupled resonator, bandpass filters for cognitive radio applications are described. Two distinct filters, one covering 176 MHz-216 MHz and the other covering 476 MHz-698 MHz is described. The filters were implemented using commercially available surface mount components on an FR-4 printed circuit board. The purpose of the bandpass filters is to provide selectivity in the front-end and provide protection from interferers. The two filters improved the intermodulation rejection of the receiver by 24 dB and 27 dB respectively.
Keywords :
UHF filters; VHF filters; band-pass filters; resonator filters; software radio; varactors; 176 to 216 MHz; 476 to 698 MHz; FR4 printed circuit board; cognitive radio applications; front-end bandpass filters; intermodulation rejection; surface mount components; three coupled resonator; varactor-tuned coupled resonator filters; Band pass filters; Bandwidth; Cognitive radio; Design methodology; Radio transceivers; Resonator filters; TV; Tiles; Tunable circuits and devices; VHF circuits;
Conference_Titel :
Radio and Wireless Symposium, 2006 IEEE
Print_ISBN :
0-7803-9412-7
DOI :
10.1109/RWS.2006.1615118
