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Compact high power diplexer has been designed for Mars Orbiter Mission (MOM) spacecraft of Indian Space Research Organization (ISRO), launched in November-2013. This is realized using waveguide combline filter structures with an additional objective of multipaction-free operation. Used in Sband TT&C transponder that handles continuous RF power of 200W in telemetry path besides an isolation of >145dB to telecommand path. Diplexer design, realization and test results are presented. Mission performance of on-board diplexer is normal.

In this article, free space capacitance of dielectric-coated conducting curvilinear surfaces is obtained using method of moments (MOM). The surfaces are discretized using triangular subsections. The curvilinear surfaces are represented by quadratic parametric elements. The MOM based on the pulse basis function and point matching is used. The integrand is divided into a regular and a singular part. The regular part of the integral is numerically evaluated by using the Gaussian quadrature algorithm for triangles. The Duffy transformation is used to evaluate the singular part of the integrals. Computed results are given for the capacitance of the dielectric-coated conducting cylinder of finite axial length and truncated cone, and compared with the previously published results.