Abstract

A new technique for accelerating the frequency sweep of MoM planar solvers is presented. It is referred to as the rapid frequency sweep (RFS) technique. The technique starts at the central frequency of the simulation band. At this frequency point, it calculates a number of basis integrals for each inner product term involved in the filling of the MoM impedance matrix. At each frequency point, a new set of weighting coefficients are evaluated. These coefficients are used to combine the basis integrals. The proposed RFS is applied to two microstrip circuits; namely, a lowpass filter and a branch line coupler. Results show that RFS offers high accuracy over a frequency band as wide as 150%. It is also very fast in comparison with the regular frequency sweep. For selected examples, a speed-up factor of about 12 is measured.

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