References
1. R. Collin “Foundations for Microwave Engineering”, McGraw-Hill, Inc., 1966.
2. G.Mattai, L. Young, E.M.T. Jones “Microwave Filters, Impedance-Matching Networks, and Coupling Structures”, Artech House, 1985.
3. L. Lewin “Theory of Waveguides”, Newnes-Butterworth, London, 1975
4. N. Marcuvitz “Waveguide Handbook”, Peter Peregrinus Ltd., London, UK, 1986.
5. R. Levy “Aperiodic Tapered Corrugated Waveguide Filter”, US Patent # 3 597 710