A Dual-Band Antenna using IDC Based CRLH-TL Cell with Non-Uniform Finger Width

In this paper, a dual-band antenna using a modified interdigital capacitor (IDC) based composite right/left-handed transmission line (CRLH-TL) unit cell is presented. The modified IDC CRLH unit cell has a non-uniform finger width along its length. The proposed modification can be utilized for further antenna size reduction, improved gain, and efficiency. Besides that, two λg/4 resonators are employed to suppress the harmonics and dual-band generation. Additionally, the shorting pin plays a vital role in achieving better impedance matching. The measured results show an impedance bandwidth (|S11| <; -10 dB) of 3.52% (3.59 - 3.72 GHz) and 3.33% (4.13 - 4.27 GHz) at the corresponding resonant frequencies of 3.65 and 4.2 GHz. The maximum measured gain and radiation efficiency of the designed antenna is 2.7, 5.8 dBi, and 71, 60 %, respectively. The experimental results are quite in good agreement with the simulation one. The performance of the designed structure is found to be much better than the similar kind of antennas reported in the literature.