A novel method of enhancing radiation performance is demonstrated by applying a hybrid reflector composed inhomogeneous metamaterial elements to four-arm log-periodic toothed antenna. The operation the antennas various cells observed, and causes deterioration narrow bandwidth are investigated through field distribution analysis. arranged in suitable positions under antenna for good wide accordi...

This research presents a metasurface reflector to support dual-band applications at 1.8 GHz and 5.5 for LTE WLAN, respectively. The proposed unit cell creating the has property of an epsilon negative medium (ENG) that is one requirements. novel design cells uses ring resonator pattern associated with interdigital capacitor control resonant frequencies relative permittivity. can be controlled by...

A high performance feed for 11 meters dual shaped reflector system is designed, developed and tested. It is a dual circularly polarized monopulse tracking feed with a measured axial ratio of 0.5dB over the required frequency band of 2GHz to 2.3GHz (Uplink: 2.02GHz -2.12GHz, Downlink: 2.2GHz-2.3GHz). This feed consists of four high performance Teflon dielectric radiating elements. Each dielectri...