The miniaturized dual-mode dual-band band-pass filters (BPF) using Minkowski-island-based (MIB) fractal patch resonators are proposed in this paper. The BPF is mainly formed by a square patch resonator in which a MIB fractal configuration with 2nd order iteration is embedded in the patch. By perturbation and interdigital coupling, the wide-band and dual-band responses are obtained respectively. For miniaturized wide-band design, at 2.41 GHz central frequency it has good measured characteristics including the wide bandwidth of 2.26-2.56 GHz (3-dB fractional bandwidth of 12.4%), low insertion loss of 0.72 dB, high rejection level (−52.5/−44.9 dB), and a patch size reduction with 60.6%. For compact dual-band design, the proposed filter covers the required bandwidths for WLAN bands . The patch size reduction of 78.1% is obtained. Two transmission zeros are placed between the two passbands and resulted in good isolation.
An equivalent circuit model for the wide-band band-pass filters (BPFs) using modified Minkowski-island-based (MIB) fractal patch are proposed in this article. The BPF is mainly formed by a square patch resonator in which a modified MIB fractal configuration with second-order iteration is embedded in the patch. By the equivalent circuit model with diamond structure, the wide-band responses are analyzed. The design procedure included equivalent circuit model is available for wide-band design. For wide-band characteristics, at 5.0 GHz central frequency, it has good measured characteristics including the wider bandwidth of 3.14-6.89 GHz (3-dB fractional bandwidth of 75%), low insertion loss of 0.39 dB, and high rejection level (248.5/244.9 dB). The patch size is 7.4 k 7.4 mm 2 (0.25 k g 3 0.25 k g ) with 14.1% reduction.
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