The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2016
Filed:
Aug. 08, 2014
The Charles Stark Draper Laboratory, Inc., Cambridge, MA (US);
John E. Grandfield, St. Petersburg, FL (US);
Phillip Hulse, Tampa, FL (US);
The Charles Stark Draper Laboratory, Inc., Cambridge, MA (US);
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.