Directly fed millimetre-wave two-arm spiral antenna
J.R. Mruk, Y. Saito, K. Kim, M. Radway and D.S. Filipovic
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 V and to match that impedance to the nominal system’s impedance of 50 V. Full-wave modelling and impedance measurements are used to assess antenna performance. A VSWR < 2.5:1 is obtained throughout the measured band.
Electronics Letters
2010
November
46
24
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