Affiliations: [a] School of Electrical Engineering and Electronic Information, Xihua University, Chengdu, Sichuan, China | [b] No.95645 Unit Troops of the People's Liberation Army, Chongqing, China | [c] Alps Electric Co., Ltd., 1-7 Yukigaya-Otsuka-machi, Ota-ku, Tokyo, Japan | [d] Logistical Engineering University of the People's Liberation Army, Chongqing, China | [e] No.94627 Unit Troops of the People's Liberation Army, Wuxi, Jiangsu, China | [f] College of Materials Science and Engineering, Chongqing University, Chongqing, China | [g] School of Information Science and Technology, Southwest Jiaotong University, Chengdu, Sichuan, China
Correspondence:
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Corresponding author: Xiao-Ming Yang, School of Electrical Engineering and Electronic Information, Xihua University, Chengdu, Sichuan, China. E-mail:0120030022@mail.xhu.edu.cn
Abstract: This paper presents a novel multiple splits octagon-shaped
metamaterial which exhibits double left-handed frequency bands roughly from
9.25 GHz to 9.68 GHz and from 15.28 GHz to 15.36 GHz derived from the
transmission characteristics by homogenization retrieval method. Two
conventional microstrip patch antennas whose resonance frequency bands are
located at the first left-handed frequency band and the second one
respectively are designed to further investigate the influence by loading
the proposed metamaterial as its superstrate. HFSS simulation numerical
results indicate that the far field radiation directivity half-power
bandwidth(HPBW) of the E-plane and H-plane have reduced by 64%, 63.7%
and 59.4%, 59%, and the maximal gain increases from 8.251 dB to 11.024 dB
and from 8.5432 dB to 11.9653 dB respectively after loading with the multiple
splits octagonal metamaterial superstrate.
Keywords: Octagon metamaterial, gain, directivity, microstrip antenna, double frequency bands
