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An excitation technology of TE30 mode in substrate integrated waveguide (SIW) and its application for designing a compact Yagi–Uda antenna array is proposed. Coplanar waveguide (CPW) structure is adopted as the input and two slots of CPW are further extended in the SIW along the third lines in the longitudinal direction to convert the electromagnetic field pattern between the slot and SIW. Therefore,...
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