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Millimeter‐wave wide beamwidth aperture–coupled antenna designed by mode synthesis
Author(s) -
Lee ChangHyun,
Lee JeongHae
Publication year - 2015
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.29058
Subject(s) - beamwidth , antenna (radio) , optics , antenna aperture , fan beam antenna , physics , radiation pattern , antenna measurement , extremely high frequency , microwave , acoustics , engineering , telecommunications , quantum mechanics
ABSTRACT In this letter, a wide beamwidth aperture–coupled antenna is designed by mode synthesis at the millimeter‐wave frequency. To obtain the wide beamwidth, a TM 010 mode and a zeroth‐order resonance mode of a metamaterial antenna are combined. A theoretical equation of synthesized radiation pattern is derived to find the conditions to obtain the widest E‐plane half power beamwidth (HPBW). By utilizing the equation, the optimal phase difference and injected power ratio to two antennas are found. The results are verified by a derived equivalent circuit and a full wave simulator. In addition, an aperture‐coupled feed that has an advantage to minimize the interference between a feed and an antenna has been used. Finally, the antenna with wide beamwidth is designed and fabricated at 35 GHz. The radiation efficiency and E‐plane HPBW of the designed antenna are simulated as 86.7% and 138°, respectively, which roughly agree with the measured results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1255–1259, 2015