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1. To derive a finite element functional to model inhomogeneous gyrotropic wave guides.2. To make calculations in terms of experimental parameters. 3. To analyse devices which currently have limited theoretical design information. 4.To study modal phenomena such as complex waves.Progress:A variational finite element functional for general phase shift and control ferrite microwave devices has been developed. This formulation is being implemented in terms of transverse field components Et Ht). . It will solve for any direction of magnetisation and it uses edge elements to avoid spurious modes and rotational boundary conditions to include symmetry. Modal behaviour has been examined in terms of experimental parameters such as applied field, signal frequency and material magnetisation. Field patterns have been calculated to examine coupling to the uniform precessional mode. An iterative scheme has been developed to study the finite element solution of resonant frequencies for inhomogeneous geometries. PublicationsDillon, B.M., Gibson, A.A.P., Symmetry analysis of anisotropic waveguides , IEE Electronic Letters, Vol. 29, No. 17, 1993, pp 1558-1560. Gibson, A.A.P., Dillon, B.M., Sheihk, S.I., Applied field/Frequency response of planar gyromagnetic disks , Int. Journal of Electronics, Vol. 76, No. 6, 1994, pp 1073-1081. Dillon, B.M., Gibson, A.A.P., Broadband Faraday rotation sections using three ridges , IEEE Transactions, Microwave Guided Wave Letters, Vol. 4, No. 3, March 1994, pp 83-85. Dillon, B.M., Gibson, A.A.P., Efficient use of symmetry for FE Analysis of Eigenvalue problems , IEE International Conf. on Computation in Electromagnetics, University of Nottingham, April 94, pp 279-282. Dillon, B.M., Gibson, A.A.P., Triply Ridged Circular Waveguides , accepted for Journal of Electromagnetic Waves and Applications, to be published in Vol. 8.
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