Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Young-Min Jo0
Myung Sung Lee0
Sang Ok Choi0
Se-hyun Oh0
Eun Seok Han0
Gregory A. O'Neill, Jr.0
Jin Hee Yoon0
John C. Farrar0
...
Date of Patent
February 10, 2009
Patent Application Number
11879208
Date Filed
July 16, 2007
Patent Primary Examiner
Patent abstract
A quadrifilar helical antenna comprising two pairs of filars having unequal lengths and phase quadrature signals propagating thereon. A conductive H-shaped impedance matching element matches a source impedance to an antenna impedance. The impedance matching element having a feed terminal at the center thereof from which current is supplied to the two filars of each filar pair disposed about an edge of the impedance matching element and symmetric with respect to a center of the impedance matching element. The impedance matching element further comprises a reactive element for matching the antenna and source impedances.
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