Highly Efficient Technique for the Full-Wave Analysis of Circular Waveguide Filters Including Off-Centered Irises
Keywords:
Circular waveguide filters, integral equation technique, multimode equivalent network, offcentered irisesAbstract
A rigorous method for the full-wave analysis and design of waveguide filters implemented in circular waveguide technology, and including offcentered circular irises, is presented. The implemented tool is based on an integral equation technique, which provides a full-wave representation of the elementary blocks of the analyzed components in terms of generalized impedance matrices. With the aim of improving the efficiency of the developed tool, the radial variation of the modal solutions of the circular waveguides has been expressed in terms of sinusoidal functions, thus avoiding the use of the more cumbersome Bessel’s functions employed in the classical formulation. Furthermore, line integrals have been used (instead of surface integrals) to compute the modal coupling coefficients of the planar waveguide junctions involved in the considered filters, thus drastically reducing the CPU effort related to the implemented tool. New designs concerning band-pass filters including off-centered circular irises are also provided. The obtained results show that the relative position of the considered circular irises can be considered as a new design parameter with a noteworthy influence on the electrical response of the investigated components. The accuracy of the proposed method has been successfully validated by comparing the obtained results with data extracted from both the technical literature and a commercial software based on the finite-element method.
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References
U. Balaji, “CAD of resonant circular iris waveguide filter with dielectric filled cavities,” Progress in Electromagnetics Research Symposium Proceedings, pp. 1139-1141, 1993.
V. Kesari, “Analysis of alternate dielectric and metal vane loaded circular waveguide for a wideband gyro-TWT,” IEEE Transactions on Electron Devices, vol. 61, no. 3, pp. 915-920, 2014.
A. Tribak, J. L. Cano, A. Mediavilla, and M. Boussouis, “Octave bandwidth compact turnstilebased orthomode transducer,” IEEE Microwave and Wireless Components Letters, vol. 20, no. 10, pp. 539-541, 2010.
A. A. San Blas, F. J. Pérez, J. Gil, F. Mira, V. E. Boria, and B. Gimeno, “Full-wave analysis and design of broadband turnstile junctions,” Progress In Electromagnetics Research Letters, vol. 24, pp. 149-158, 2011.
J. Uher, J. Bornemann, and U. Rosenberg, Waveguide Components for Antenna Feed Systems: Theory and CAD, Artech House, Norwood, 1993.
G. Conciauro, M. Guglielmi, and R. Sorrentino, Advanced Modal Analysis: CAD Techniques for Waveguides Components and Filters, Wiley, Chichester, 2000.
M. Qudrat-E-Maula, L. Shafai, and Z. A. Pour, “Dielectric loaded circular waveguide feeds,” 16th International Symposium on Antenna Technology and Applied Electromagnetics, pp. 1-2, 2014.
J. Li, H. Huang, Z. Zhang, W. Song, H. Shao, C. Chen, and W. Huang, “A novel X-band diplexer based on overmoded circular waveguides for high-power microwaves,” IEEE Transactions on Plasma Science, vol. 41, no. 10, pp. 2724-2728, 2013.
Z. Shen and R. H. MacPhie, “Scattering by a thick off-centered circular iris in circular waveguide,” IEEE Transactions on Microwave Theory and Techniques, vol. 43, no. 11, pp. 2639-2642, 1995.
K. Wu, “An optimal circular-waveguide dualmode filter without tuning screws,” IEEE Transactions on Microwave Theory and Techniques, vol. 47, no. 3, pp. 271-276, 1999.
S. P. Yeo and S. G. Teo, “Thick eccentric circular iris in circular waveguide,” IEEE Transactions on Microwave Theory and Techniques, vol. 46, no. 8, pp. 1177-1180, 1998.
M. Yahia, J. W. Tao, and H. Sakli, “Analysis of complex discontinuities in circular waveguides using hybrid finite element method and multimodal variational method,” Progress In Electromagnetics Research Letters, vol. 51, pp. 101-107, 2015.
G. Gerini, M. Guglielmi, and G. Lastoria, “Efficient integral equation formulations for the computation of the multimode admittance or impedance matrix of planar waveguide junctions,” IEEE MTT-S International Microwave Symposium Digest, pp. 1747-1750, 1998.
R. R. Mansour and R. H. MacPhie, “An improved transmission matrix formulation of cascaded discontinuities and its application to E-plane circuits,” IEEE Transactions on Microwave Theory and Techniques, vol. 34, no. 12, pp. 1490-1498, 1986.
G. G. Gentili, “Properties of TE-TM modematching techniques,” IEEE Transactions on Microwave Theory and Techniques, vol. 39, no. 9, pp. 1669-1673, 1991.
B. Gimeno and M. Guglielmi, “Multimode equivalent network representation for junctions between coaxial and circular waveguides,” International Journal of Microwave and Millimeter-Wave Computer-Aided Engineering, vol. 7, no. 2, pp. 180-194, 1997.
V. E. Boria, G. Gerini, and M. Guglielmi, “An efficient inversion technique for banded linear systems,” IEEE MTT-S International Microwave Symposium Digest, pp. 1567-1570, 1997.
