Flush Mounted Flour-Arm Spiral With Shallow Backup Cavity,
MOTOROLA INC TEMPE AZ GOVERNMENT ELECTRONICS GROUP
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Performance is presented of a four-arm 3.7 inch diameter 2-18 GHz spiral antenna flush mounted on a ground plane containing a shallow recessed backup cavity. The spiral arms are precision etched on a .025 inch fiberglass substrate suspended .150 inch above the bottom of the cavity with a honeycomb spacer, forming a bonded assembly. Both measured and calculated sum and difference patterns, and gain are included. Calculated patterns are obtained, together with currents on the spiral arms, using a wire model Method of Moments simulation.
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