An extremely wide-band tightly coupled dipole antenna array(TCDA) is presented. A novel balun is developed with a spoof surface plasmon polariton (SSPP) structure and a RC resonant circuits to achieve impedance matching and a conversion from unbalanced dipole feeding to balanced feeding. According to the simulation, the proposed TCDA demonstrates a remarkable 60:1 bandwidth (0.08GHz-4.83GHz) with VSWR<2.5. The overall array thickness is <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.03λ low</tex> (where <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ low</tex> is the wavelength at the lowest frequency of operation, 80 MHz). The final array design consists of 12 dipole unit cells arranged in a one-dimensional configuration.
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Ying et al. (2024) studied this question.
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