1. Alford, A. and C.B. Watts, "A Wide Band Coaxial Hybrid," 1956 IRE National Convention Record, Part 1, pp. 171-179.

2. Andrews, D.P. and C.S. Aitchison, "A Microwave Octave-Bandwidth Lumped Element Quadrature Coupler," Proceedings of the 2000 IEEE MTT-S International Microwave Symposium.

3. Benjamin, J.A., "Use Hybrid Junctions for More VHF Power," Electronic Design, 1 Aug 1968, pp. 54-59.

4. Celliers, A.F., "Sensitivity Analysis of 3 dB Branchline Couplers," Microwave Journal, Nov 1986, pp. 188-190.

5. Cuhaci, M. and G.J.P. Lo, "High Frequency Microstrip Branch-Line Coupler Design with T-Junction Discontinuity Compensation," Electronics Letters, Vol. 17, No. 2, 22 Jan 1981, pp. 87-89.

6. Dydyk, M., "Master the T-Junction and Sharpen Your MIC Designs," Microwaves, May 1977, pp. 184-186.

7. Ficher, R.E., "Broad-Band Twisted-Wire Quadrature Hybrids," IEEE Transactions on Microwave Theory and Techniques, May 1973, pp. 355-357.

8. Fisher, Reed, "Twisted-Wire Quadrature Hybrid Directional Couplers," QST, Jan 1978, pp. 21-23.

9. Ho. C.Y., "Design of Lumped Quadrature Couplers," Microwave Journal, Sep 1979, pp. 67-70.

10. Ho, C.Y., "Transform Impedance with a Branch-Line Coupler,"Microwaves, May 1976, pp. 47-52.

11. Ho, C.Y. and B. Furlow, "Design of VHF Quadrature Hybrids," RF Design, Jul/Aug 1979, pp. 49-54 (Part I), Sep/Oct 1979, pp. 32-39 (Part II).

12. Ho, C.Y. and J.H. Weidman, "A Broadband Quadrature Coupler,"Microwave Journal, May 1983, pp. 216-219.

13. Ho, C.Y. and G-L. Chen, "Design of Wideband Quadrature Couplers for UHF/VHF," RF Design, Nov 1989, pp. 58-61 (Part I), Dec 1989, pp. 51-55 (Part II).

14. Jones, E.M.T., "Wide-Band Strip-Line Magic-T," IRE Transactions on Microwave Theory and Techniques, Mar 1960, pp. 160-168.

15. Kim, D.I. and Y. Naito, "Broad-Band Design of Improved Hybrid-Ring 3-dB Directional Couplers," IEEE Transactions on Microwave Theory and Techniques, Nov 1982, pp. 2040-2046.

16. Lefferson, P., "Twisted Magnet Wire Transmission Line," IEEE Transactions on Parts, Hybrids, and Packaging, Vol. PHP-7, No. 4, Dec 1971, pp. 148-154.

17. Leighton, W.H. and A.G. Milnes, "Junction Reactance and Dimensional Tolerance Effects on X-Band 3-dB Directional Couplers," IEEE Transactions on Microwave Theory and Techniques, Oct 1971, pp. 818-824.

18. London, S.Y., "A New Approach to Broadband Transmission Line Hybrid Design," Applied Microwave & Wireless, Sep 1999, pp. 34-46.

19. Maas, S., "Broadband, VHF Lumped-Element Couplers Using Imperfect Transformers," Applied Microwave & Wireless, Nov 1999, pp. 70-78.

20. Mouw, R.B., "Broad-Band Hybrid Junction and Application to the Star Modulator," IEEE Transactions on Microwave Theory and Techniques, Nov 1968, pp. 911-918.

21. Muraguchi, M., T. Yukitake, and Y. Naito, "Optimum Design of 3-dB Branch-Line Couplers Using Microstrip Lines," IEEE Transactions on Microwave Theory and Techniques, Aug 1983, pp. 674-678.

22. Nystrom, G.L., "Synthesis of Broad-Band 3-dB Hybrids Based on the 2-Way Power Divider," IEEE Transactions on Microwave Theory and Techniques, Mar 1981, pp. 189-194.

23. Pascalar, H.G., "Strip Line Hybrid Junction," IRE Transactions on Microwave Theory and Techniques, Jan 1957, pp. 23-30.

24. Podell, A., "Quadrature Hybrid Couplers Serve Narrowband Applications," Microwaves & RF, Aug 1999, pp. 44-47.

25. Pon, C.Y., "Hybrid-Ring Directional Coupler for Arbitrary Power Divisions," IRE Transactions on Microwave Theory and Techniques, Nov 1961, pp. 529-535.

26. Reed, J. and G.J. Wheeler, "A Method of Analysis of Symmetrical Four-Port Networks," IRE Transactions on Microwave Theory and Techniques, Oct 1956, pp. 246-252.

27. Tatsuguchi, J., "UHF Strip Transmission Line Hybrid Junction," IRE Transactions on Microwave Theory and Techniques, Jan 1961, pp. 3-6.

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