Abstract
In order to realize a compact L-band transponder design for the calibration of spaceborne synthetic aperture radar (SAR) systems, a novel antenna was developed by DLR. As with previous designs for different frequency bands, the future transponder is based on a two-antenna concept. This paper addresses the issue of antenna coupling between corrugated L-band horn antennas, which are operated in close proximity. The antenna coupling is analyzed via simulations and measurements by utilizing specifically defined coupling parameters. Additionally, improvements to further lower the mutual antenna coupling have been designed, tested, and are described in this paper.
Highlights
Spaceborne synthetic aperture radar (SAR) systems are used to provide weather and daytime independent images of the earth
The antenna developed for the compact transponder design in L-band is referred to as a VEGA antenna, which is an abbreviation of the German equivalent to the choked
This paper describes and shows the latest steps in the antenna development for DLR’s novel L-band transponders
Summary
Spaceborne synthetic aperture radar (SAR) systems are used to provide weather and daytime independent images of the earth. Active targets, which are referred to as transponders, are able to receive, amplify, and retransmit the SAR signal. By doing so, they appear as bright spots in the imaged region. The German Aerospace Center (DLR) has been developing, building, and operating accurate transponders for more than 20 years. These are based on a two-antenna concept, where one antenna is used to receive the SAR signal and the second antenna is used to retransmit the amplified signal. The positioner allows for precise alignment of the transponder in both azimuth and elevation
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