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A hybrid representation of the Green's function in an overmoded rectangular cavity

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2 Author(s)
Wu, D.I. ; NBS, Boulder, CO, USA ; Chang, D.C.

A hybrid ray-mode representation of the Green's function in a rectangular cavity is developed using the finite Poisson summation formula. To obtain a numerically efficient scheme for computing the field generated by a point source in a large rectangular cavity, the conventional modal representation of the Green's function is modified in such a way that all the modes near resonance are retained while the truncated remainder of the mode series is expressed in terms of a weighted contribution of rays. For an electrically large cavity, the contribution of rays from distant images becomes small; therefore, the ray sum can be approximated by one or two dominant terms without a loss of numerical accuracy. To illustrate the accuracy and the computational simplification of this ray-mode representation, numerical examples are included with the conventional mode series (summed at the expense of long computation time) serving as a reference

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:36 ,  Issue: 9 )

Date of Publication:

Sep 1988

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