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

Abstract

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-Ω 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.