Directly fed millimetre-wave two-arm spiral antenna.

Authors :: Mruk, J.R.
Saito, Y.
Kim, K.
Radway, M.
Filipovic, D.S.
Source :: Electronics Letters (Institution of Engineering & Technology); 11/25/2010, Vol. 46 Issue 24, p1585-1587, 3p, 2 Diagrams, 2 Graphs
Publication Year :: 2010
Abstract: 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. [ABSTRACT FROM AUTHOR]