1. Nguyen, C., "Investigation of hybrid modes in broadside-coupled coplanar waveguide for microwave and millimeter-wave integrated circuits," IEEE Antenna Propagat. Symp., 18-23, Montreal, Canada, July 1995.
2. Wen, C. P., "Coplanar-waveguide directional couplers," IEEE Trans. Microwave Theory and Tech., Vol. 18, No. 6, 318-322, June 1970.
doi:10.1109/TMTT.1970.1127226
3. Singkornrat, P. and J. A. Buck, "Picosecond pulse propagation in coplanar waveguide forward directional couplers," IEEE Trans. Microwave Theory and Tech., Vol. 6, No. 39, 1025-1028, 1991.
doi:10.1109/22.81675
4. Bedair, S. S. and I.Wolff, "Fast and accurate analytic formulas for calculating the parameters of a general broadside-coupled coplanar waveguide for (M)MIC applications," IEEE Trans. Microwave Theory and Tech., Vol. 5, No. 37, 843-850, 1989.
doi:10.1109/22.17450
5. Kim, D. J., Y. Jeong, J. H. Kang, J. H. Kim, C. S. Kim, J. S. Lim, and D. Ahn, "A novel design of high directivity CPW directional coupler design by using DGS," IEEE, MTT-S Int. Microw. Symp. Dig., 1239-1243, Long Beach, Ca, USA, June 1995.
6. Akkaraekthalin, P., C. Sawangnate, and V. Vivek, "Conductor-backed coplanar waveguide directional coupler and its use for a varactor-tuned 90 degree phase shifter," IEEE APCCAS 2000 Circuits and Systems, 525-528, Dec. 2000.
doi:10.1109/APCCAS.2000.913552
7. Liao, C. L. and C. H. Chen, "A novel coplanar-waveguide directional coupler with finite-extent backed conductor," IEEE Trans. Microwave Theory and Tech., Vol. 1, No. 51, 200-206, 2003.
doi:10.1109/TMTT.2002.806902
8. Nedil, M., T. A. Denidni, and L. Talbi, "CPW multilayer slot-coupled directional coupler," Electron. Lett., Vol. 12, No. 41, 45-46, 2005.
9. Nedil, M. and T. A. Denidni, "Quasi-Static analysis of a new wideband directional coupler using CPW multilayer technology," IEEE MTT-S Int. Microw. Symp. Dig., 1133-1136, San Francisco, USA, June 2006.
10. Bona, M., L. Manholm, J. P. Satarski, and B. Svensson, "Low-loss compact Butler matrix for a microstrip antenna," IEEE Trans. on Microwave Theory and Tech., Vol. 9, No. 50, 2069-2075, 2002.
doi:10.1109/TMTT.2002.802318
11. Wong, M. F., V. F. Hanna, O. Picon, and H. Baudrand, "Analysis and design of slot-coupled directional couplers between doubleside substrate microstrip lines," IEEE Trans. on Microwave Theory and Tech., Vol. 12, No. 39, 2123-2129, 1991.
doi:10.1109/22.106554
12. Simons, R. N., Coplanar Waveguide Circuits, Components, and Systems, Wiley, 2001.
13. Ghione, G. and C. U. Naldi, "Coplanar waveguides for MMIC applications: effect of upper shielding, conductor backing, finite-extent ground planes, and line-to-line coupling," IEEE Trans. on Microwave Theory and Tech., Vol. 3, No. 35, 260-267, 1987.
doi:10.1109/TMTT.1987.1133637
14. Gupta, K. C., R. Garg, I. Bahl, and P. Bhartia, Microstrip Lines and Slotlines, Artech House, 1996.
15. Tanaka, T., K. Tsunoda, and M. Aikawa, "Slot-coupled directional couplers between double-sided substrate microstrip lines and their applications," IEEE Trans. Microwave Theory Tech., Vol. 12, No. 36, 1752-1757, 1988.
doi:10.1109/22.17410
16. Chang, T. Y., C. L. Liao, and C. H. Chen, "Coplanar-waveguide tandem couplers with backside conductor," IEEE Microwave and Wireless Components Lett., Vol. 6, No. 13, 214-216, 2003.
doi:10.1109/LMWC.2003.814100
17. Liao, C.-L. and C. H. Chen, "A novel coplanar-waveguide directional coupler with finite-extent backed conductor," IEEE Trans. on Microwave Theory and Tech., Vol. 1, No. 51, 200-206, 2003.
doi:10.1109/TMTT.2002.806902
18. IE3D 8.2, Zeland Software, Inc. Fremont, CA.
19. Shih, Y. C. and T. Itoh, "Analysis of conductor-backed coplanar wave-guide," Electron. Lett., Vol. 18, 538-540, 1982.
doi:10.1049/el:19820365
20. Haydl, W. H., "On the use of vias in conductor-backed coplanar circuits," IEEE Trans. on Microwave Theory and Tech., Vol. 6, No. 50, 1571-1577, 2002.
doi:10.1109/TMTT.2002.1006419
21. Lim, C. and S. Uysal, "Design of a broadband directional coupler using microstrip-like multilayer technology," Microwave and Optical Technol. Lett., Vol. 5, No. 23, 273-275, 1999.
doi:10.1002/(SICI)1098-2760(19991205)23:5<273::AID-MOP4>3.0.CO;2-H
22. Sharma, R., T. Chakravarty, S. Bhooshan, and A. B. Bhattacharyya, "Design of a novel 3 dB microstrip backward wave coupler using defected ground structure," Progress In Electromagnetics Research, Vol. 65, 261-273, 2006.
doi:10.2528/PIER06100502
23. Tomita, M. and Y. Karasawa, "Analysis of scattering and coupling problem of directional coupler for rectangular dielectric waveguides," Progress In Electromagnetics Research, Vol. 29, 295-320, 2000.
doi:10.2528/PIER99120601
24. Watanabe, K., J. Ishihara, and K. Yasumoto, "Coupled-mode analysis of a gating-assisted directional coupler using singular perturbation technique," Progress In Electromagnetics Research, Vol. 25, 23-37, 2000.
doi:10.2528/PIER99040503
25. Watanabe, K., J. Ishihara, and K. Yasumoto, "Coupled-mode analysis of a gating-assisted directional coupler using singular perturbation technique," Journal of Electromagnetic Waves and Applications, Vol. 13, No. 12, 1681-1682, 1999.
doi:10.1163/156939399X00114
26. Casula, G. A., G. Mazzarella, and G. Montisci, "Effective analysis of a microstrip slot coupler," Journal of Electromagnetic Waves and Applications, Vol. 18, No. 9, 1203-1217, 2004.
doi:10.1163/1569393042955333
27. Mohra, A., A. F. Sheta, and S. F. Mahmoud, "A small size 3 dB 0 degree/180 degree microstrip ring couplers," Journal of Electromagnetic Waves and Applications, Vol. 17, No. 5, 707-718, 2003.
doi:10.1163/156939303322226365