A Novel Dual-Band Holographic Metasurface Antenna with Mode-Selective Electromagnetic Bandgap Structure

Abstract

This paper presents a novel dual-band holographic metasurface antenna excited by transverse magnetic (TM) and transverse electric (TE) surface waves at distinct frequencies, enabling independently adjustable beamforming patterns. The proposed antenna employs a two-layer architecture: the first layer incorporates a mode-selective electromagnetic bandgap (EBG) structure to isolate the TM and TE modes, while the second layer uses orthogonal strip patterns, individually modulated to convert each surface wave mode into leaky-wave radiation. The isolation and independent control of the two modes allow the antenna to achieve high efficiency comparable to single-mode designs, across various beamforming angles. The proposed design is validated through a dual-port implementation supporting dual-polarization control in two bands: the TM mode at 10 GHz, excited by a vertical monopole, and the TE mode at 14 GHz, excited by a printed horizontal dipole. Each port produces directional beams at target angles of –20° and 10°, achieving measured gains of 14.06 dBi and 15.67 dBi, respectively. © 1963-2012 IEEE.