The six-port junctions permit the use of analogue voltage control phase shifters and attenuators so that continuous variation of phase and amplitude is possible. In such configurations, the control devices need not be precalibrated and any malfunction of the array control circuit can be detected. REFERENCES [1] Brown W.C., (1979) "A Profile of Power transmission by Microwaves," Astronautics & Aeronautics, May. [2] ANGELINI A.M.,(1987) "Proposta di un Programma di Studio e Ricercha sulla Possibilita di trasmissione Intercontincntale di Energia via Satellite,"L’Elettrotecnica, Vol. LXXIV, No. 2, Feb. [3] Forbyce, S.W., Brown W.C., (1979) "Applications of Free-space Microwave Power transmission," Astronautics & Aeronautics, Sept. [4] MlECKE W., (1988) "An Active Phase Shifter for Phased Array Applications Providing Amplitude and Phase Control," Phased Array Radars, pp. 591-596, Edited by Chris Pell, Microwave Exhibitions and Publishers Limited. [5] Engen G.F., (1977) "The Six-port Reflectometer: An Alternative Network Analyzer," IEEE Trans. Microwave Theory Tech., Vol. MTf-25, pp. 1075-1083. [6] Hoer C.A., (1981) "A High Power Dual Six-port Automatic Network Analyzer for Determining Biological Effects of RF and Microwave Radiation," IEEE MTT-S, International Microwave Symposium Digest 1981, pp. 157-159. [7] Gronson H.M. , Susman L., (1977) "A Six-port Automatic Network Analyser," IEEE Trans. Microwave Theory Tech., Vol. MTT-25, pp. 1080-1091. [8] Larose R„ GHANNOUCHI F. M., Bosisio R. G„ (1990) "A New Multi-harmonic Load-pull Method for Non-linear Device Characterization and Modeling," IEEE MTT-S, International Microwave Symposium Digest 1990, Vol. 1, pp. 443-446, Dallas, TX, 7-11 May. [9] GHANNOUCHI F.M., Bosisio R.G., Haiji R., (1989) "Polarization Measurements of Microwave/millimeter Wave Antennas Using Six-port Techniques," Proceedings of the International Conference on Electromagnetics in Aerospace Applications, pp. 283-286, Torino, Italy, 12-15 Sept. [10] ENGEN G.F., (1978) "Calibrating the Six-port Reflectometer by Means of Sliding Terminations," IEEE Trans. Microwave Theory Tech., Vol. MTT-26, pp. 951-957, Dec. [11] GHANNOUCHI F.M., BlSlSIO R.G., (1988) "An Alternative Explicit Six-port Matrix Calibration Formalism Using Five Standards,"IEEE Trans. Microwave Theory Tech.,No\. MTT-36, No. 3, pp. 494-498, March. [12] GHANNOUCHI F.M., BosisioR.G.,(1988) "The Six-port Reflectometer and Its Complete Calibration by Four Standard Terminations," IEE Proceedings-H: Microwaves, Antennas and Propagation. Vol. 135, No. 4. pp. 285-288, August.
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