Ground plane meandering in Z direction for spiral antenna
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United States of America Patent
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May 10, 2016
Grant Date -
Feb 11, 2016
app pub date -
Aug 8, 2014
filing date -
Aug 8, 2014
priority date (Note) -
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Abstract
An antenna has a spiral driven element that meanders in a z direction, perpendicular to the x-y plane of the spiral, and a ground plane that also meanders in the z direction, such that spacing between the ground plane and the driven element is an odd multiple of one-quarter wavelength, along at least a portion of the length of the driven element. The spacing promotes constructive interference from signals reflected by the ground plane, increasing the front-to-back ratio of the antenna and, thereby, providing gain. The ground plane of a wideband version of the spiral antenna meanders, such that the spacing varies between about an odd multiple of one-quarter wavelength of an upper frequency to about an odd multiple of one-quarter wavelength of a lower frequency of a frequency range, thereby providing gain over a range of frequencies.
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