Diversity antenna with electronically switchable wide/narrow band for cognitive radio systems
Antennas and Propagation（2014）
摘要
A polarization diversity antenna embedded with ultra wideband (UWB)/narrow-band (NB) switching capability is presented. The two port, uni-planar design utilizes an open annular slot with orthogonal feeding mechanism to achieve polarization diversity performance across the UWB band from 2.9 GHz to 11GHz. Coplanar wave guide fed electronically reconfigurable slot resonator based filters are deployed for switching between UWB and NB modes. This low profile design facilitates nearly omnidirectional radiation pattern, low envelop correlation coefficient and moderate gain. In time domain, the antenna shows flat group delay variations of less than 1ns. These characteristics makes the proposed antenna suitable for next generation cognitive radio systems, where the UWB antenna is used for spectrum sensing and NB antenna for communication.
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关键词
UHF antennas,antenna feeds,antenna radiation patterns,cognitive radio,coplanar waveguides,electromagnetic wave polarisation,loop antennas,microwave antennas,next generation networks,omnidirectional antennas,radio spectrum management,resonator filters,signal detection,slot antennas,ultra wideband antennas,ultra wideband communication,UWB antenna,UWB-NB switching capability,coplanar waveguide,correlation coefficient,electronically reconfigurable slot resonator based filter,electronically switchable wide-narrow band antenna,flat group delay variation,frequency 2.9 GHz to 11 GHz,next generation cognitive radio system,omnidirectional radiation pattern,open annular slot antenna,orthogonal antenna feeding mechanism,polarization diversity antenna,spectrum sensing,two port uniplanar design,ultrawideband-narrow-band switching capability,UWB antenna,cognitive radio,polarization diversity antenna
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