Abstract
The miniaturized dual-mode tri-band band-pass filters BPF using crossed-island patch resonator is proposed in this article. The BPF is mainly formed by a square patch resonator in which a crossed-island configuration is embedded in the patch. The patch size reduction with 74.4% is achieved. By the perturbation and the alternative inter-digital coupling, the tri-band responses are obtained. The proposed filter covers the required bandwidths for WLAN band 2.26-3.11 GHz and 5.02-6.0 GHz and X-band 7.58-8.41 GHz applications. Five transmission zeros are placed between three pass-bands and resulted in a good isolation. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:457-463, 2014.
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