Progress In Electromagnetics Research C · 2012 · 22 citations · 21 references
EngineeringElectrical EngineeringAntennasMicrowave EngineeringWireless CommunicationsBroadband AntennasMicrostrip AntennasMicrowave AntennasMicrowave Integrated CircuitsMicrowave ResonatorsMicrowave System DesignBandwidthFractal AntennasFractional BandwidthInsertion LossInsertion Loss ReductionMicrostrip ResonatorsMiniaturized AntennasResonator Design
Abstract—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 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 0.72 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 (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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Lin‐Chuan Tsai, C.‐W. Hsue · IEEE Transactions on Microwave Theory and Techniques · 2004 · 443 citations