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Transmission-line matrix analysis of continuous waveguiding structures using stepped-impedance cavities

Transmission-line matrix analysis of continuous waveguiding structures using stepped-impedance cavities

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Up to the present time, the t.l.m. method of numerical analysis has found the dispersion characteristics of continuous waveguiding structures by obtaining the resonant frequencies of quarter wavelength cavities. Long cavities requring many nodes have been necessary, and the computer power required for solution becomes excessive as the frequency of interest decreases. This paper shows how cavities of any length may be represented by stepped impedance cavities which, for the t.l.m. method, are only two mesh lengths long for 2-dimensional analysis and 2.5 mesh lengths long for 3-dimensional analysis. The savings in computer time and storage, using the stepped impedance technique, may be of the order of 100 times.

References

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      • S. Ahmed , P. Daly . Finite element methods for inhomogeneous waveguides. Proc. IEE , 1661 - 1664
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      • Z.J. Csendes , P. Silvesteri . Numerical solution of dielectric loaded waveguides: I-fininite element analysis. IEE Trans. , 1124 - 1131
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      • S. Akhtarzad , P.B. Johns . The solution of Maxwell's equations in three space dimensions and time by the TLM method of numerical analysis. Proc. IEE. , 12 , 1344 - 1348
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      • S. Akhtarzad , P.B. Johns . Three-dimensional transmission-line matrix analysis of microstrip resonators. IEEE Trans. , 990 - 997
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      • P. Daly . Hybrid-mode analysis of microstrip by finite-element methods. IEEE Trans. , 19 - 25
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