1. Abu-Hudrouss, A. M. and M. J. Lancaster, "Design of multipleband microwave filters using cascaded filter elements," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 16, 2109-2118, 2009.
doi:10.1163/156939309790109225 Google Scholar
2. Monti, G., F. Congedo, and L. Tarricone, "On the use of a rat-race coupler in the design of a 180o phase shifter," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 8, 1201-1210, 2009. Google Scholar
3. Wu, Y., Y. Liu, and S. Li, "A new dual-frequency Wilkinson power divider," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 4, 483-492, 2009.
doi:10.1163/156939309787612400 Google Scholar
4. Liang, C., Computational Microwave, Northwest Electronics Academy Press, Xi'an, 1985.
5. Liang, C., Y. Xie, and B. Guan, Concise Microwave, Higher Education Press, Beijing, 2006.
6. Liang, C. and C. Qiu, "Some theorems for the lossless reciprocal network," Acta Electronica Sinica, Vol. 19, No. 3, 101-109, Jun. 1991 (in Chinese). Google Scholar
7. Shi, X., C. Liang, and Y. Han, "A useful theorem for a lossless multiport network," IEEE Trans. Microwave Theory Tech., Vol. 43, No. 3, 697-699, Mar. 1995.
doi:10.1109/22.372121 Google Scholar
8. Liang, C. and L. Li, "Study of characteristic phases of a kind of lossless even symmetry networks," Acta Electronica Sinica, Vol. 13, No. 2, 271-274, 2004. Google Scholar
9. Liang, C., L. Li, and X. Shi, "Generalized constraint for a lossless multiport network," Journal of Electromagnetic Waves and Applications, Vol. 18, No. 12, 1591-1604, 2004.
doi:10.1163/1569393042955243 Google Scholar
10. Heiber, A. L. and R. J. Vernon, "Matching consideration of lossless reciprocal 5-port waveguide junctions," IEEE Trans. Microwave Theory Tech., Vol. 21, No. 4, 547-552, Aug. 1973.
doi:10.1109/TMTT.1973.1128057 Google Scholar
11. Liang, C. and X. Shi, "Generalized matching theory for multi-port network," Acta Electronica Sinica, Vol. 12, No. 21, 17-22, 1993 (in Chinese). Google Scholar
12. Butterweck, H. J., "Scattering bounds for the general lossless reciprocal three-port," IEEE Trans. Circuit Theory, Vol. 13, No. 2, 290-293, Sep. 1966. Google Scholar