CST – Computer Simulation Technology

Low-Profile Wideband Metasurface Antennas Using Characteristic Mode Analysis

Low-Profile Wideband Metasurface Antennas Using Characteristic Mode Analysis
Feng Han Lin, and Zhi Ning Chen
IEEE Antennas and Propagation Society
Vol. 65, No. 4, 17th February 2017
pp. 1706 - 1713
Antenna, characteristic mode analysis, low profile, metamaterials, metasurface, microstrip patch antenna, wideband.
A metasurface antenna is proposed for low-profile and wideband operation based on characteristic mode analysis (CMA). A metasurface radiator formed by a diamond-slotted patch is fed by a microstrip line at its bottom through a slot centered on a ground plane. The CMA is used for the modeling, analysis, and optimization of the proposed antenna in order to reveal the underlying modal behaviors of the metasurface and to guide the mode excitation. It is found that an extraordinary quisi-TM30 metasurface mode and a slot mode both with wideband broadside radiation are formulated and well excited simultaneously, leading to a broadband operation. Empirical equations are outlined for speeding up design. To verify the concept, a 2×2 array with the overall size of 1.78λ0×1.78λ0×0.07λ0 (λ0 is the free-space wavelength at 5.5 GHz) is designed and prototyped at 5-GHz Wi-Fi bands. The achieved impedance bandwidth for 10-dB return loss is 31% with the gain of 13-14.5 dBi over the operating bandwidth.

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