A frequency-reconfigurable elliptical monopole antenna for cognitive radio networks

Authors : SANTASRI KOLEY, DEBJANI MITRA

Pages : 2535-2546

View : 16 | Download : 11

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In this paper, an elliptical disk monopole antenna with seven switchable states, including an ultrawideband insert ignore into journalissuearticles values(UWB); state and six narrowband states, is presented. It consists of an elliptical disk radiator to operate in the UWB mode for cognitive radio insert ignore into journalissuearticles values(CR); sensing. To operate in the narrowband mode, the antenna is fed through a defected ground structure insert ignore into journalissuearticles values(DGS); integrated microstrip line. Frequency reconfigurability is achieved by changing the DGS slot length using six electronic switches. The simple proposed design can cover a wide range of frequency bands from 0.75 to 12 GHz, has an omnidirectional radiation pattern with high gain, and is especially suitable as a CR front-end. The fabricated prototype shows good impedance matching in the specified frequency range.
Keywords : Cognitive radio, reconfigurable antenna, switchable filter, ultrawideband