Inline Coaxial Balun-Fed Ultrawideband Cornu Flared Horn Antenna
Patent, Filed 31 Jul 1997, patented 26 Oct 1999
DEPARTMENT OF THE NAVY WASHINGTON DC
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The inline coaxial balun fed cornu flared horn antenna is formed by transitioning a coaxial transmission line to a parallel-plate transmission line with a Klopfenstein impedance profile and terminating with a flared horn antenna based on a scaled cornu spiral. The cornu spiral is a mathematical plane curve formed by parametrically plotting the scaled cosine Fresnel integral versus the scaled sine Fresnel integral. The antenna has the property that the curvature of the flare increases linearly in proportion to the are length of the flare. the Klopfenstein impedance profile of the inline balun ensures a low voltage reflection across a wide bandwidth with a minimum transition length and together with the cornu flare satisfies the requirements for a wideband design. The design efficiently radiates and receives a high power pulse of ultrawideband electromagnetic waves over a preferred range of angles in space and transmits a field that is nearly the scaled temporal derivative of the input voltage signal and receives a voltage that is nearly the scaled replica of the incident field.
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