The Naval Research Laboratory is designing an azimuthally scannable phased array with a large vertical aperture. A pillbox design is being used because it achieves a large vertical aperture with the simplicity of a space feed. Commonly, pillbox antennas are fed with waveguide horns. For this design, however, a dipole feed was chosen, to reduce the size of the feed network and to relieve the congestion of having many adjacent coaxial transmission line to waveguide transitions. Calculated and measured responses for the antenna and feed network are presented.
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