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Electrical and electronic engineering
A compact dual-band high-impedance-surface EBG structure is employed as a reflector for a dual-band annular-slot antenna. The reflector comprises an array of miniaturized EBG cells which utilizes square patches augmented by four S-shaped corrugated arms to reduce the resonant frequency of the proposed EBG structure. In order to broaden the bandwidth and adjust the frequency ratio for the dual-band EBG structure, a log-periodic spacing between the S-shaped strips is introduced. The combination of microstrip-fed annular slot and EBG reflector provides directional properties for both frequency bands with reduced size and low-profile.
Bao, X., Ruvio, G. & Ammann, M. (2009) Directional Dual-Band Slot Antenna with Dual-Bandgap High-Impedance-Surface Reflector. Progress In Electromagnetics Research, Vol C, Issue 9, pp.1-11 doi:10.2528/PIERC09051505