This paper presents a novel design for reconfigurable microstrip patch antenna capable of operating at multiple frequencies, specifically at 7.5, 10.7, 11.7, 16.5 GHz and 6.9, 13, 16.7 GHz. The antenna design consists of a modified patch entrust with rectangular and elliptical patch and two PIN diode for frequency tuning. The proposed antenna is fabricated on a low-cost FR-4 substrate with a dielectric constant of 4.4 and a thickness of 1.6 mm. The simulated results show that the antenna can achieve frequency tuning by changing the DC bias voltage applied to the PIN diodes. The proposed antenna shows good performance in terms of return loss, radiation pattern, and gain. The results indicate that the proposed reconfigurable microstrip patch antenna is a promising candidate for future communication systems that require frequency agility and reconfigurability.

Reconfigurable, return loss, PIN diode, multiband, frequency agility