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http://dx.doi.org/10.7471/ikeee.2011.15.4.299

Wideband horn antenna including circular-polarizer and straight-type mode-converter for Ka-band  

Jung, Young-Bae (Division of Electrics, Electronics and Conterol Engineering, Hanbat National University)
Publication Information
Journal of IKEEE / v.15, no.4, 2011 , pp. 299-304 More about this Journal
Abstract
In this paper, the circular polarized horn antenna composed of circular polarizer and impedance transformer is designed, and fabricated. For the circular polarizer, two types of the polarizer are designed and the electrical performance of them is compared; rectangular waveguide polarizer with $45^{\circ}$-inclined dielectric slab and oval shaped one. Straight type mode converter has a stepped impedance structure and plays a role of converting waveguide TE mode into coaxial TEM mode, and the proposed antenna is designed to directly connect with active components using the feed-through in the input port of the mode converter. Fabricated antenna has the wideband performance, VSWR<1.5 and Axial ratio < 1.0dB, ranging from 30.085 to 30.885 GHz, and the antenna gain is 6.7~7.0 dBi.
Keywords
Antenna; rectangular horn; circular polarizer; mode converter; wideband;
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