title: Suppressing side-lobe radiations of horn antenna by loading metamaterial lens.
abstract: We propose a new approach to control the amplitude and phase distributions of electromagnetic fields over the aperture of a horn antenna. By loading a metamaterial lens inside the horn antenna, a tapered amplitude distribution of the aperture field is achieved, which can suppress the side-lobe radiations of the antenna. The metamaterial is further manipulated to achieve a flat phase distribution on the horn aperture to avoid the gain reduction that usually suffers in the conventional low-sidelobe antenna designs. A prototype of the metamaterial-loaded horn antenna is designed and fabricated. Both numerical simulations and measured results demonstrate the tapered aperture-field distribution and significant reduction of side-lobe and back-lobe radiations in the operating frequency band.
authors.affiliation: 1] State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China [2] Synergetic Innovation Center of Wireless Communication Technology, Southeast University, Nanjing 210096, China.
authors.forename: Mei Qing
authors.initials: MQ
authors.lastname: Qi
authors.affiliation: 1] State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China [2] Synergetic Innovation Center of Wireless Communication Technology, Southeast University, Nanjing 210096, China.
authors.forename: Wen Xuan
authors.initials: WX
authors.lastname: Tang
authors.affiliation: 1] State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China [2] Synergetic Innovation Center of Wireless Communication Technology, Southeast University, Nanjing 210096, China.
authors.forename: Hui Feng
authors.initials: HF
authors.lastname: Ma
authors.affiliation: 1] State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China [2] Synergetic Innovation Center of Wireless Communication Technology, Southeast University, Nanjing 210096, China.
authors.forename: Bai Cao
authors.initials: BC
authors.lastname: Pan
authors.affiliation: 1] State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China [2] Synergetic Innovation Center of Wireless Communication Technology, Southeast University, Nanjing 210096, China.
authors.forename: Zui
authors.initials: Z
authors.lastname: Tao
authors.affiliation: State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
authors.forename: Yong Zhi
authors.initials: YZ
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
authors.forename: Tie Jun
authors.initials: TJ
authors.lastname: Cui