There has been an increasing demand for efficient feeding structures in microwave and millimeter-wave circuit and antenna configurations with a goal of providing better performance and easy fabrication. Early the aperture-coupled fed was proposed [1] and has been widely used for many applications due to the advantages of fabrication as well as electrical characteristics [2]. For some phased array applications using a tapered slot antenna as a radiator, an aperture-coupled orthogonal feed technique [3] has been suggested, which enables a robust hybrid configuration combining brick type radiator and a tile type feed network. For an efficient design of such feed structure, micristripline-to-vertically mounted slotline transition has been studied [4].
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