A Wideband Low-Profile Tightly Coupled Antenna Array with a Very High Figure of Merit

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Journal Article
IEEE Transactions on Antennas and Propagation, 2019
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IEEE A wideband, low-profile, tightly coupled antenna array with a simple feed network is presented. The dipole and feed network in each unit cell are printed on both sides of a single RT/DuroidTM 6010 substrate with a relative dielectric constant of 10.2. The feed network, composed of meandered impedance transformer and balun sections, is designed based on Klopfenstein tapered microstrip lines. The wide angle impedance matching is empowered by a novel wideband metasurface superstrate. For the optimum design, scanning to 70° along the E-plane is obtained together with a very high array figure of merit, PA = 2.84. The H-plane scan extends to 55°. The broadside impedance bandwidth is 5.5:1 (0.80 – 4.38) GHz with an active VSWR value ≤ 2. The overall height of the array above the ground plane is 0.088 λL, where λL is the wavelength at the lowest frequency of operation. A prototype was fabricated and tested to confirm the design concepts.
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