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An 18 to 110 GHz two-arm Archimedean spiral antenna directly fed with a Dyson balun is designed, fabricated, and measured. The feed line includes a monolithically integrated rectangular coaxial line impedance transformer designed to reduce the nominal antenna impedance from ∼180 to 80 Ω and to match that impedance to the nominal system's impedance of 50 Ω. Full-wave modelling and impedance measurements are used to assess antenna performance. A VSWR<2.5:1 is obtained throughout the measured band.
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Mruk et al. (2010) studied this question.
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