Abstract
We present a compact coaxial flared antenna for communication and tracking applications with a broad instantaneous RF bandwidth greater than alternatives like a circular horn. To solve the free space impedance mismatch due to the small aperture, a flared, impedance transforming outer conductor is proposed. Modal analysis is applied and modal coefficients, as a function of the number of excitations, are assessed; a circular polarized TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> difference mode with the same cutoff frequency as the TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> sum mode via impedance matching and specified mode coupling points resulted in a 2.4 to 1 bandwidth. The polarization diverse antenna exhibits linear or circular polarization and is well suited as a direct radiating element or as a feed for low f/D lens or reflector applications.
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