In this letter, a novel printed frequency-reconfigurable microstrip square slot antenna for switchable Bluetooth, WiMAX, and WLAN applications is presented. The proposed antenna has a small size of 20 × 20 mm2in order to be able to cover lower frequencies; as for Bluetooth applications, miniaturization techniques such as modification of the ground plane and inserting an adjustable backplane cross-shaped sleeve have been employed. Moreover, by implementation of p-i-n diodes within the antenna structure, switchable frequency responses are achieved. The presented antenna has a small size while providing suitable switchable radiations at 2.3-2.51 GHz (BW = 8.7%) Bluetooth, 3.35-3.75 GHz (BW = 11.2%) WiMAX, and 4.95-5.53 GHz (BW=11%) WLAN.
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Borhani et al. (2015) studied this question.
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