1. An Octave Bandwidth Coaxial Waveguide Feed Antenna With an Iris Matching Network
- Author
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Du, Xuan, Johnson, Thomas, Landecker, Tom, and Veidt, Bruce
- Subjects
Aperture ,Computer science ,Acoustics ,Bandwidth (signal processing) ,coaxial waveguide ,020206 networking & telecommunications ,Choke ,02 engineering and technology ,Radiation properties ,Beamwidth ,Band-pass filter ,iris matching network ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,Reflection coefficient ,Wideband ,radio telescope feed antenna ,wideband - Abstract
The design of a 2.2 to 4.4 GHz coaxial waveguide feed antenna for radio telescopes is described. An iris matching network is designed to improve the unmatched aperture reflection coefficient from $-$ 6.7 to $-$ 12 dB over a 2:1 bandwidth ratio. An efficient method of optimizing the irises over a wideband is presented. The properties of wideband iris matching networks including their behavior as bandpass structures are discussed. The far-field beamwidth of the feed is held constant across the octave band by a corrugated choke. Measured radiation properties agree closely with simulation.
- Published
- 2020