V-shaped long wire frequency reconfigurable antenna for WLAN and ISM band applications

Abstract

In recent days, many slot and patch antennas are being developed for various applications. The proposed work suggests a V-shaped small dimension frequency reconfigurable antenna configuration for WLAN and ISM band applications. The proposed antenna is 16mmx16mm in sizeand is switchable from one frequency band to another. The frequency reconfiguration characteristics of the antenna are achieved by connecting PIN diodes in the ground, thus creates the antenna to switch the frequencies at 5.5–6 GHz (BW = 8.6%, fo = 5.8 GHz), 4.6–5.6 GHz (BW = 18%, fo = 5.3 GHz),4.6–5.7 GHz (BW = 20.7%, fo = 5.3 GHz), 4.6–4.7 GHz (BW = 2%, fo = 4.66 GHz),4.8–5.5 GHz (BW = 13.4 %, fo = 5.2 GHz). The proposed work uses two 4.5 mm width and 0.25 mm length strips respectively and an impedance matching section of 1.75mmx2mm for feeding the antenna. The gain of the antenna can be improved by reducing the ground area to 1 mm. The PIN diode switches can be controlled by DC bias voltage that is applied through RF chokes. The V-shaped long wire microstrip resonant antenna is fabricated and the parameters are measured experimentally. The compared experimental results with simulated results exhibit maximum antenna gain of 6dBi at 5.3GHz and minimum antenna gain of 3.4dBi at 4.66 GHz respectively.