A new configurable beamwidth antenna using cylindrical electromagnetic Band Gap

Abstract

In modern wireless communication systems, agile antennas with a configurable beamwidth have been attracted a lot of interest. To fulfill several requirements, various techniques for designing variable-beamwidth antennas have recently been proposed. In this work, the authors propose a new cylindrical electromagnetic band gap (CEBG) structure for modifying the radiation beamwidth. CEBG structures composed of metallic wires have been introduced in (H. Boutayeb, et al., 2006). These structures are radialy and circularly periodic and present pass-bands and stop-bands to TM cylindrical electromagnetic waves when they are excited in their center. By introducing a defect and modifying the number of the periodic surfaces, a directive radiation with variable beamwidth can be obtained. By studying the field distribution in the H-plane, significant size reduction and power supply were achieved. The proposed structure shows good performances in terms of beamwidth configurability with less power supply and less active elements. The obtained results is presented and discussed in the paper.