Wideband to narrowband frequency reconfiguration using PIN diode

A frequency reconfigurable antenna using log‐periodic technique is reported. A 13 square patches fed by inset feed line technique are connected with a single transmission line by a log‐periodic array formation to form a wideband frequency from 3 to 6 GHz. By applying 13 PIN diodes at the transmission line with a quarter wavelength radial stub biasing, three different sub‐band frequencies (3–4, 3.7–5, and 4.8–6 GHz) are configured by switching ON and OFF the PIN diodes. The antenna has a directive radiation pattern and gain about 6–8 dB at all sub‐bands. Simulated and measured results with antenna design are presented and they show that a good agreement in term of return loss.