On 5/6/15 3:09 PM, Bob Camp wrote:
GPS helix antennas were a really big deal in about 1982. Once people started to get experience with GPS and a variety of designs, they became less of a big deal. I do not know of any modern precision antennas that use a helix.
Most precision antennas I've seen recently use some form of a crossed dipole, with drooping elements with a weird shape (to get the match decent at all the frequencies, and to get the relative phase shift right).
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