A large number of references dealing with the geometric stiffness matrix of the DKT finite element exist in the literature, where nearly all of them adopt an inconsistent form. While such a matrix may ...
Abstract: The coupling matrix provides an immediate tool to describe a network, widely used in the context of microwave filters. While several techniques exist to obtain and manipulate the coupling ...
Abstract: This paper presents a compact planar design of 2-D Butler matrix steering the beam of a $2\times 2$ patch antenna array for D-band frequencies. The stripline Butler matrix feeding network is ...
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