Miniaturized reconfigurable band‐pass filter with electronically controllable for WiMAX/WLAN applications

Abstract

A novel reconfigurable band‐pass filter for worldwide interoperability for microwave access (WiMAX)/wireless local area network (WLAN) applications is presented. By using an H‐shaped strip with a pair of C‐shaped slots in the band‐pass filter two new resonances can be achieved. The proposed band‐pass filter has three different switchable states: 2.25–10.72 GHz in WLAN mode, 3.34–3.71 GHz in WiMAX mode, and 1.65–1.89 GHz in narrowband mode. The band‐pass filter which uses a switchable slotted structure for reconfigurability has a simple structure and smallest size in comparison to band‐pass filters reported in literature (Kikkert, TENCON 2005 IEEE region 10, 2005, Fan et al., Prog Electromagn Res 75 (2007), 285–293, Wang et al., Prog Electromagn Res 77 (2007), 67–73, Ojaroudi et al., Advanced electromagnetics symposium, 2012, Zhao et al., Prog Electromagn Res B 3 (2008), 131–141). Also the proposed filter has a major advantage in providing tighter capacitive coupling to the line in comparison to known radiating strip. To generate DC isolation in the RF path, we use a pair of gap distances in the microstrip loop. Simulated and experimental results obtained for this band‐pass filter show that the proposed band‐pass filter has a good return and insertion loss within the WiMAX/WLAN frequency range. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:509–512, 2014

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