A Planar Wideband Millimeter-Wave Antenna Array With Low Side Lobe Using ‘±1’ Excitations

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Journal / PublicationIEEE Transactions on Antennas and Propagation
Publication statusOnline published - 4 May 2021


A new method is proposed to suppress the side lobe level (SLL) of antenna array. Different from conventional amplitude-tapered excitation method‘, ±1’ excitations are used to feed the antenna array and achieve low SLL. The SLL is firstly optimized by using modified binary particle swarm optimization algorithm with ideal ‘±1’ excitations. Then, the ideal ‘±1’ excitations are replaced with microstrip line feed and aperture coupled magneto-electric (ME) dipoles. The ‘+1’ excited ME dipoles are fed from the default direction, while the ‘-1’ excited ME dipoles are fed from the direction physically reversed. According to the optimized array configuration, combining the ME dipole elements with a 256-way parallel power divider, a planar 16 × 16 millimeter-wave antenna array is designed, fabricated and measured. An overlapped working bandwidth of 38% (24.1-35.4 GHz) is obtained with a SWR less than 2.4 and SLL lower than -17.2 dB. The gain is up to 26.3 dBi. The new binary concept paves a new way for SLL suppressing.

Research Area(s)

  • Antenna arrays, Bandwidth, Dipole antennas, Feeds, low side lobe, ME dipole, Microstrip, microstrip line, millimeter wave, Planar arrays, Substrates, wide band