Investigating the |S11| Parameter of CPW-Fed Antennas for WiMAX and WLAN Applications

This communication presents a novel, low-profile coplanar waveguide (CPW)-fed dual-band microstrip antenna for wireless applications. The proposed antenna consists of an inverted L-shaped slot radiator coupled with a U-shaped ground plane and two vertical ground terminals. It is implemented on FR4-epoxy dielectric substrate material (epsilon(r) = 4.4, tan delta = 0.02) with dimensions of 56 x 56 mm(2) and generates two desired resonant frequencies at about 2.40 GHz and 3.48 GHz for WLAN and WiMAX applications, respectively. The antenna shows two distinct bands, first from 2.34 to 2.54 (200 MHz at -20 dB) and second from 3.25 to 3.60 (350 MHz at -12 dB), which cover the entire WLAN (f(c) = 2.4 GHz, 2.400-2.484 GHz) and WiMAX (f(c) = 3.5 GHz, 3.400-3.690 GHz) bands. This work aims to combine WLAN and WiMAX communication standards simultaneously into a single device by designing a single antenna that can excite dual-band operation. Also, numerical findings are presented for the antenna's return loss and 2D radiation patterns. Good agreement between measured and simulated outcomes is established. The results indicate that the proposed antenna, which performs well, may be appropriate for WLAN/WiMAX applications, including those involving portable electronics and emerging technologies.