Manuscript received July 15;
1987;
revised January 13;
1988. This work was supported in part by the National Aeronautics and Space Administration and in part by the European Space Agency. Y;
R ahmat-Samii is with the Jet Propulsion Laboratory;
California Institute of Technology;
Pasadena;
CA 91109. J. Lemanczyk is with the Electromagnetics Institute;
Technical University of Denmark;
DK-2800;
Lyngby;
Denmark. IEEE Log Number 8821105;