formity in performance over a production lot. The on-axis gain of this horn at 2.45 GHz was 14.57 dB relative to an isotropic radiator, and use of the universal response curves for sectoral horns (4) indicated that the Narda #645 would provided power uniformity within ± 0.5 dB over a region that lies within 7 degress of the axis. Homs were positioned for overhead illumination and yielded a power density variation of ± 1 dB over a floor space of 1.2 x 1.8 m (Fig. 1). A divided platform was used for the support of cages. Each half was covered with anechoic material and the bottom platform fitted with casters so that the entire assembly containing the cages could be rolled out from opposite sides of the exposure chamber. Lighting was separately provided to each half of the platform so that day/night periods could be independently adjusted.
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