A novel compact dual-band antenna based on composite right/left hand transmission line (CRH-TL) for WLAN application

A novel dual-band antenna by using CRLH-TL structure is proposed for the wireless local area network (WLAN) application. The dual-band behavior is achieved by loading shorted meander lines and interdigital capacitor to form unit-cell CRLH-TL loaded antenna. The bandwidth enhancement of proposed antenna can be achieved by merging the two extended-bandwidth resonances. The dual-band version exhibits two distinct resonances at 2.4GHz and 5.5GHz, with measured −10 dB bandwidths of 500MHz and 2.1GHz. The lowest resonance at 2.4GHz corresponds to a 47% reduction in the resonant frequency compared to a reference unloaded monopole. The size of proposed antenna is 30 × 20 × 1.6mm3. The measured gain reaches −1.6 dBi at 2.4Hz and 2.6 dBi at 5.5GHz, respectively. The measurement and simulation results show good agreement.