1. Bethe, A., "Theory of diffraction by small holes," Physical Review, Vol. 66, 163-182, Oct. 1944.
doi:10.1103/PhysRev.66.163        Google Scholar

2. Cohn, S. B., "Determination of aperture parameters by electrolytic-tank measurements," Proceedings of the IRE, Vol. 66, 1416-1421, Nov. 1951.        Google Scholar

3. Gao, J., "Analytical formula for the coupling coefficient β of a cavity-waveguide coupled system," Nuclear Instruments and Methods, Vol. A309, 5-10, 1991.        Google Scholar

4. Gao, J., "Analytical determination of the coupling coefficient of waveguide cavity coupling systems," Nuclear Instruments and Methods, Vol. A481, 36-42, 2002.        Google Scholar

5. Kumar, R., "A novel method for variable coupling using iris rotation in RF couplers," Nuclear Instruments and Methods, Vol. A600, 534-537, 2009.        Google Scholar

6. Balleyguier, P. and M. Painchault, "Design of RF power input ports for IPHI RFQ," Proc. European Particle Accelerator Conf. EPAC, 2124, Paris, 2002.        Google Scholar

7. Balleyguier, P., "External Q studies for APT cavity couplers," Proc. Linear Accelerator Conf. LINAC, 133-135, Chicago, 1998.        Google Scholar

8. Kamigaito, O., "Circuit model representation of external-Q calculation," Phys. Rev. ST Accl. Beams, Vol. 9, 062003, 2006.
doi:10.1103/PhysRevSTAB.9.062003        Google Scholar

9. Rengarajan, S. R., "Analysis of a centered-inclined waveguide slot coupler," IEEE Trans. Microwave Theory Tech., Vol. 37, No. 5, 884-889, May 1989.
doi:10.1109/22.17455        Google Scholar

10. Rengarajan, S. R., "Characteristics of a longitudional/transverse coupling slot in crossed rectangular waveguides," IEEE Trans. Microwave Theory Tech., Vol. 37, No. 8, 1171-1177, Aug. 1989.
doi:10.1109/22.31075        Google Scholar

11. Nesterenko, , M. V., V. A. Katrich, Y. M. Penkin, S. L. Berdnik, "Analytical methods in theory of slot-hole coupling of electrodynamic volumes," Progress In Electromagnetics Research, Vol. 70, 79-174, 2007.
doi:10.2528/PIER06121203        Google Scholar

12. Accatino, L., G. Bertin, and M. Mongiardo, "A four pole dual mode elliptic filter realized in circular cavity," IEEE Trans. Microwave Theory Tech., Vol. 44, No. 12, 2680-2687, Dec. 1996.
doi:10.1109/22.554629        Google Scholar

13. Khan, Z. A., C. F. Bunting, and M. D. Deshpande, "Shielding effectiveness of metallic enclosures at oblique and arbitrary polarizations," IEEE Trans. Electromagnetic Compatibility, Vol. 47, No. 1, 112-122, Feb. 2005.
doi:10.1109/TEMC.2004.842117        Google Scholar

14. Saito, Y. and D. S. Filipovic, "Analysis and design of monolithic rectangular coaxial lines for minimum coupling," IEEE Trans. Microwave Theory Tech., Vol. 55, No. 12, 2521-2530, Dec. 2007.
doi:10.1109/TMTT.2007.910092        Google Scholar

15. Collins, R. E., Field Theory of Guided Waves, IEEE Press, 1996.

16. Mongia, R. K. and R. K. Arora, "Equivalent circuit parameters of an aperture coupled open resonator cavity," IEEE Trans. Microwave Theory Tech., Vol. 41, No. 8, 1245-1250, Aug. 1993.
doi:10.1109/22.241661        Google Scholar

17. Roy, R. and O. Shanker, "Calculation of inter cavity coupling coefficient for side coupled standing wave linear accelerator," IEEE Trans. Microwave Theory Tech., Vol. 41, No. 6, 1233-1235, Jan. 1993.
doi:10.1109/22.238552        Google Scholar

18. McDonald, N. A., "Polynomial approximations for the electric polarizabilities of some small apertures," IEEE Trans. Microwave Theory Tech., Vol. 33, No. 11, 1146-1149, Nov. 1985.
doi:10.1109/TMTT.1985.1133186        Google Scholar

19. McDonald, N. A., "Simple approximations for the longitudinal magnetic polarizabilities of some small apertures," IEEE Trans. Microwave Theory Tech., Vol. 36, No. 7, 1141-1144, Jul. 1988.
doi:10.1109/22.3648        Google Scholar

20. McDonald, N. A., "Polynomial approximations for the transverse magnetic polarizabilities of some small apertures," IEEE Trans. Microwave Theory Tech., Vol. 35, No. 1, 20-23, Jan. 1987.
doi:10.1109/TMTT.1987.1133589        Google Scholar

21. McDonald, N. A., "Electric and magnetic coupling through small apertures in shield walls of any thickness," IEEE Trans. Microwave Theory Tech., Vol. 20, 689-685, Oct. 1972.        Google Scholar

22. Pozar, M., Microwave Engineering, 2nd Ed., 333, Wiley, New York, 2003.

23. Kang, Y., S. Kim, M. Doleans, I. E. Campisi, M. Stirbet, P. Kneisel, G. Ciovati, G. Wu, and P. Yla-Oijala, "Electromagnetic simulations and properties of the fundamental power couplers for the SNS superconducting cavities," Proc. Particle Accelerator Conference, (PAC-2001), 1122-1124, Jun. 2001.        Google Scholar