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Multi-conductor devices are very common in microwave engineering, such as in combline or interdigital filters. The electromagnetic fields in these devices involve multiple transverse electromagnetic (TEM) modes, which can be characterized by the Finite Element Method (FEM). This paper presents an efficient formulation not only to compute but also to subsequently orthonormalize these multiple TEM modes...
This contribution presents the analysis of waveguide problems involving general boundary conditions of perfect magnetic wall. This type of boundary condition, when the waveguide device under analysis has physical symmetry, is used very commonly to speed up the computation time in general waveguide solvers by exploiting the symmetries of the excitation. This contribution is focused on extending its...
Following up on our previous work, we formulate a linear, loss-adjusted, shift factor mixed integer program (MIP) to co-optimize generation and network topology. While both the B-theta and shift factor topology control (TC) formulations lead to production cost saving, we showed that the shift factor formulation performs better for small to medium switch able sets. In this paper we extend the original...
Mass and volume of the payload electronics are significant contributors to the overall cost of space systems. Satellite systems rely on switch matrices to provide system redundancy and to enhance capacity by providing flexible interconnectivity. The RF-MEMS technology offers the potential of large reductions in the mass and volume of satellite switch matrices leading to a significant cost reduction...
The standard economic generation dispatch (ED) minimizes generation costs subject to transmission constraints, where the status of each line, i.e., open or closed, is fixed. Recent research shows that, by optimally dispatching the network topology along with generation resources, significant congestion costs may be avoided. Optimal topology control, i.e., appropriate changes of transmission-line status,...
The standard optimal power flow (OPF) problem minimizes generation costs over one study period assuming a fixed system topology. The prospect of a smart grid incorporating extensive cyber capabilities enabling significant progress in economic efficiency, reliability and environmental sustainability, ought to transform the OPF problem accordingly. This paper discusses the inclusion of tractable dynamic...
Four-port rectangular waveguide switches presented in this paper are based on alternating short and open circuit loads in the waveguide path. The switches are made up of four waveguides connected by sections of ridge waveguides where simple short-circuit loads can be activated to control the signal paths. The proposed concept eliminates the need to use bulky rotary mechanisms to provide path switching...
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