S. Sushanth Kumar, R. Jaiswal, Kahani Kumari, K. V. Srivastava
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Four Port Frequency Reconfigurable Antenna for Cognitive Radio Applications
In this paper, three reconfigurable narrow-band communicating antennas are integrated with ultra wide-band sensing antenna with good isolation and a wide tuning range is presented for cognitive radio (CR) applications. A patch antenna and two circular slot antennas are used as a narrow-band communicating antenna, and by using varactor diodes, frequency reconfigurability is achieved. A narrow-band patch antenna and two circular slot antennas are used to tune the frequency range 3.1 GHz - 8.2 GHz. The proposed antenna is fabricated, and antenna parameters are measured. The measured parameters are well-matched with simulated results and the measured isolation between the ports is better than 20 dB.
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