A Novel Slot Antenna with Reconfigurable Meander-Slot DGS for Cognitive Radio Applications
Keywords:
Cognitive radio (CR), defected ground structure (DGS), reconfigurable, reconfigurable meander-slot (RMS), slot antenna (SA)Abstract
A new planar reconfigurable wideband slot antenna is proposed for cognitive radio (CR) applications in this paper. The wideband function is obtained by inserting a meander ?-shaped slot in the rectangular radiation patch. The reconfigurable characteristics with frequency diversity are achieved using four ideal switches integrated on the meander-slot defected ground structure (DGS) band stop filter embedded in the ground plane. The design procedures, impedance bandwidth, and radiation patterns are presented for explanation and examination of this antenna. The proposed reconfigurable slot CR antenna can work at three modes by controlling the switches at ON and OFF states. It operates over the frequency band between 1.52 GHz and 2.75 GHz (bandwidth of 57.6%), with two independent bands from 1.54 GHz to 2.28 GHz (38.7%) and 2.28 GHz to 2.85 GHz (22.2%). The measured results show that it has wide impedance bandwidth, multimode characteristics, and omnidirectional radiation patterns.
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References
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