relation: https://khub.utp.edu.my/scholars/7720/ title: Photonic band gap aperture coupled fractal shape tri-band active antenna creator: Saeidi, T. creator: Ismail, I.B. creator: Ahadi, M. creator: Alhawari, A.R.H. description: A modified Koch fractal shape is used to decrease the dimensions of an antenna and resonates at more than one band for agricultural application. A new feeding technique of aperture coupled method called a non-uniform annular Photonic Band Gap is applied in order to integrate the designed antenna to the active elements. Subsequently, a transmission line transformer is designed using Genetic algorithm to achieve a perfect matching between the active element (amplifier) and the load (antenna). The proposed antenna is designed and fabricated. The results show that the proposed antenna has a high gain of 20.5 dB, 21 dB, and 22 dB at 0.915 GHz, 1.8 GHz and 2.45 GHz respectively with a compact size and low cost. The results predict its prospect as a promising alternative to the conventional one, which is compatibly applicable to agriculture applications especially when multiband function is required. © 2016 Electromagnetics Academy. All rights reserved. publisher: Electromagnetics Academy date: 2016 type: Article type: PeerReviewed identifier: Saeidi, T. and Ismail, I.B. and Ahadi, M. and Alhawari, A.R.H. (2016) Photonic band gap aperture coupled fractal shape tri-band active antenna. Progress In Electromagnetics Research C, 69. pp. 125-138. ISSN 19378718 relation: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84997523873&doi=10.2528%2fPIERC16082901&partnerID=40&md5=565a9ed3c5aa5d6bd5918a6d6389aa4b relation: 10.2528/PIERC16082901 identifier: 10.2528/PIERC16082901