Miniature Direction-Finding Antenna Array

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  • Author: Joseph R. Jahoda
Most tactical plat-forms using Direction-Finding (DF) antenna sys-tems require the use of small aperture antenna arrays, especially on sub-marines and small aircraft where space is limited. Recently, Astron was asked to provide the small- est possible DF antenna array for a submarine mast. However, to achieve this small array the multiple antennas for each band of frequencies must be brought closer together on the diameter and overlapped with the other frequency bands to decrease the height (see Fig. 1) for a typical, multi-band, DF array covering 1 to 18,000 MHz. Unfortunately, these desirable features, such as decreasing its volume, cause cross-coupling and degradation of each antenna’s RF pattern caus-ing serious errors in the angle to the target.
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