A hybrid asymmetric folded substrate integrated waveguide (AFSIW) and spoof surface plasmon polaritons (SSPP) combined waveguiding structure is employed to design a dual-band frequency-scanning leaky-wave antenna with slower beam scanning speed at forward region <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">(30ᵒ < θ < 62ᵒ)</tex> and faster beam scanning speed at backward region <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">(-56ᵒ < θ < -18ᵒ)</tex> specifically. The waveguide structure is obtained by cutting a vertical AFSIW in half along its longitudinal symmetrical plane and adding SSPP structure along one side of middle copper layer of AFSIW. The n = 0 dominant mode remains at lower frequency band and the n = -1 space harmonic mode is generated effectively by sinusoidal modulation.
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Tang et al. (2024) studied this question.
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