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:
Jan. 22, 2008
Filed:
Jun. 15, 2006
Yoonjae Lee, Fairfax, VA (US);
Suman Ganguly, Falls Church, VA (US);
Yoonjae Lee, Fairfax, VA (US);
Suman Ganguly, Falls Church, VA (US);
Center for Remote Sensing, Inc., Fairfax, VA (US);
Abstract
An antenna having multiple antenna elements of unequal lengths, form in a conical shape. The longest antenna element has a trap in a specific location of the antenna element. Multiple traps can be used for extended coverage depending upon the frequency band. The antenna elements are connected together through a transversal-wire ring and a feed transmission line is attached to it. The antenna occupies minimal footprint in the horizontal direction and maintains a low VSWR and a uniform beam pattern over a wide frequency band, more than 1:20. The antenna has a constant radiation pattern over a 1:6 bandwidth and the pattern bandwidth may be increased using more antenna elements and traps. The elevation and azimuth patterns show a consistent characteristic from 100 MHz to 600 MHz.