Abstract
A novel compact and low profile microstrip antenna is proposed as a suitable radiating device for a software defined radio system. The antenna allows the frequency reconfigurability by activating a subset of the four groups of pin diodes connecting a central patch to four different peripheral elements. Each one of the four peripheral elements provides a resonance mode independent from the others that can be tailored by the designer. The radiating device guarantees an overall of <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$2^{4} =16$</tex></formula> different states with both single and multifrequency resonances within a wide bandwidth going from 0.8 GHz–3.0 GHz, without requiring any extra matching network. Measurements on a realized prototype assess the level of performance estimated in simulations and prove the usefulness of the proposed antenna in a device exploiting the cognitive radio paradigm.
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