0191-9067/81/010155-07S02.00/0 Copyright 1981 SUNSAT Energy Council THE SPS TRANSMITTING ANTENNA RADIATION PATTERN PAUL F. COMBES Microwave Department Centre d'Etudes et de Recherches de Toulouse B.P. 4025, Toulouse Cedex. France I. GENERALITIES After the reference project achieved by NASA and the DOE, the SPS transmitting antenna is a huge array of radiating feeds of 1 km diameter. The radiating feeds are slotted waveguides grouped in elementary arrays of 10 x 10 m2. There are 7220 elementary arrays. The antenna therefore appears as a plane circular area on which are distributed a great number of radiating feeds, the slots. The radiation pattern of such an antenna (Fig. 1) is well known when these feeds are equiphase and have an amplitude whose variation offers the revolution symmetry. For amplitude variation laws such as A(r) = e0 + rr (1 - r2)” with r = p/a. the radiation pattern is given by II. IDEAL ILLUMINATION LAWS AND RADIATION PATTERNS The Various Choices Considered Figure 2 [after (1)] shows, for various illumination laws of the transmitting antenna, the variation of the power density in terms of the distance at the center of
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