Open Loop Resonator-Based Triple Passband Filter for 1.5 GHz, 2.45 GHz and 3.65 GHz Applications

In this paper, a dual mode mixed open loop resonator (OLR)-based metamaterial antenna is introduced for the design of a triple-passband filter for GPS, WLAN and WiMAX applications. The antenna is embedded into a 50-Omega microstrip framework. The Rogers RT-5880, which has a succinct structure, is used as the substrate in the proposed passband filter design, where the attainment of the antenna is explored both integrally and experimentally. A partial ground system is applied in the ground layer and stepwise analysis is performed on the proposed resonator, which can pursue the fundamental even-mode resonant frequency. Based on the proposed resonator, a bandpass filter is designed and fabricated to justify the perception, focusing on 1.5 GHz, 2.45 GHz, and 3.65 GHz. In addition, the filter is evaluated using the Nicolson-Ross-Weir approach at the filtering frequency. The effective electromagnetic parameters retrieved from the simulation of the S-parameters imply that the OLR metamaterial antenna exhibits negative refraction bands. With a favorable design and double-negative characteristics, this structure is suitable for a triple passband filter, particularly at 1.5 GHz, 2.45 GHz and 3.65 GHz, which cover GPS, WLAN, and WiMAX, respectively.