- Alford, A. and C.B. Watts, "A Wide Band Coaxial Hybrid," 1956 IRE National Convention Record, pp. 171-179.
- Benjamin, J.A., "Use Hybrid Junctions for More VHF Power," Electronic Design, Vol. 16, 1 Aug 1968, pp. 54-59.
- Celliers, A.F., "Sensitivity Analysis of 3dB Branchline Couplers," Microwave Journal, Nov 1986, pp. 188-190.
- 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.
- Dydyk, M., "Master the T-Junction and Sharpen Your MIC Designs," Microwaves, May 1977, pp. 184-186.
- Ho, C.Y., "Transform Impedance with a Branch-Line Coupler," Microwaves, May 1976, pp. 47-52.
- Ho, C.Y. and J.H. Weidman, "A Broadband Quadrature Coupler," Microwave Journal, May 1983, pp. 216-219.
- Jones, E.M.T., "Wide-Band Strip-Line Magic-T," IRE Transactions on Microwave Theory and Techniques, Mar 1960, pp. 160-168.
- Khilla, A-M., "Tunable Branch-Line Hybrids," Frequenz, Vol. 43, No. 7, Jul 1989, pp. 194-200.
- Kim, D.I. and Y. Naito, "Broad-Band Design of Improved Hybrid-Ring 3-dB Directional Couplers," IEEE Transactions on Microwave Theory and Techniques, Vol. 30, No. 11, Nov 1982, pp. 2040-2046.
- 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, Vol. MTT-19, No. 10, Oct 1971, pp. 818-824.
- Mouw, R.B., "A Broad-Band Hybrid Junction and Application to the Star Modulator," IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-16, No. 11, Nov 1968, pp. 911-918.
- 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, Vol. 31, No. 8, Aug 1983, pp. 674-678.
- Pal, S., S.K. Saini, V.S. Rao, and A. Bhaskaranarayana, "Unequal Power Split Hybrid Coupler," RF Expo(?)
- Pascalar, H.G., "Strip Line Hybrid Junction," IRE Transactions on Microwave Theory and Techniques, Jan 1957, pp. 23-30.
- Pon, C.Y., "Hybrid-Ring Directional Coupler for Arbitrary Power Divisions," IRE Transactions on Microwave Theory and Techniques, Nov 1961, pp. 529-535.
- 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.
- Tatsuguchi, I., "UHF Strip Transmission Line Hybrid Junction," IRE Transactions on Microwave Theory and Techniques, Jan 1961, pp. 3-6.

If you have any additional references on this subject, please Email them to christrask@earthlink.net _==_ / and they will be added to this resource list. ( "> (> )> ^^ Birdstein is a creation of Peter Casso