Title :
Directly fed millimetre-wave two-arm spiral antenna
Author :
Mruk, Joseph R. ; Saito, Yuya ; Kim, Kunsu ; Radway, Matthew ; Filipovic, Dejan S.
Author_Institution :
Dept. of Electr., Comput., & Energy Eng., Univ. of Colorado at Boulder, Boulder, CO, USA
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.
Keywords :
antenna feeds; baluns; coaxial cables; directive antennas; microwave antennas; millimetre wave antennas; spiral antennas; transformers; Archimedean spiral antenna; Dyson balun; directly fed millimetre-wave two-arm spiral antenna; frequency 18 GHz to 110 GHz; impedance measurements; monolithicly integrated rectangular coaxial line impedance transformer; nominal antenna impedance;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.2947
