Abstract
The miniaturized dual-mode dual-band band-pass fllters (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 conflguration with 2nd order iteration is embedded in the patch. By perturbation and inter- digital coupling, the wide-band and dual-band responses are obtained respectively. For miniaturized wide-band design, at 2.41GHz central frequency it has good measured characteristics including the wide bandwidth of 2.26{2.56GHz (3-dB fractional bandwidth of 12.4%), low insertion loss of 0.72dB, high rejection level (i52:5/i44:9dB), and a patch size reduction with 60.6%. For compact dual-band design, the proposed fllter covers the required bandwidths for WLAN bands (2.20{2.96GHz and 4.74{5.85GHz). The patch size reduction of 78.1% is obtained. Two transmission zeros are placed between the two pass- bands and resulted in good isolation.
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