FREQUENCY RECONFIGURABLE U-SLOT ANTENNA FOR SDR APPLICATION

What is it about?

a novel frequency reconfigurable U-slot microstrip antenna with T- shaped feed line for commercial frequency bands is proposed for Software Defined Radio applications. The proposed antenna indexed as A-I in this paper, operates at three different frequencies: 1.85 GHz, 1.9 GHz and 2.4 GHz depending on the switching states of PIN diodes. Furthermore, to strengthen the proposed design concept and strategy another improved antenna (A-II) is designed and tested. In comparison to antenna A-I, the improved antenna design (A-II) utilizes four slots/ PIN diodes in order to increase the number of reconfigurable frequency states. Depending on the switch states of four PIN diodes, the improved antenna operates on five different reconfigurable frequency bands centered at: 1.5 GHz, 1.6 GHz, 1.8 GHz, 1.9 GHz and 2.24 GHz. The measured results shows a return loss better than 22dB, maximum gain of 2.5 dB and maximum efficiency of 78%. Moreover, radiation pattern for the proposed antennas is stable at all operating frequencies.

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