Amplitude and Phase Calibration of an Dual Polarized Active Phased Array Antenna
conference paper
In the Netherlands, a Polarimetrie C-band aircraft SAR (Synthetic Aperture Radar) has been developed. The project is called PHARUS, an acronym for Phased Array Universal SAR. This instrument serves remote sensing applications. The antenna system contains 48 modules (expandable to 96). A module is composed of a Transmit/Receive (T/R) module, a microstrip patch antenna and both are connected via a ratrace or hybrid ring. Every module can be replaced without disassembling a major part of the antenna. The antenna has an azimuth scan range of +1- 20° and an elevation scan range of +/-15°. With a centre frequency of 5.3 GHz (= 56 mm) this results in an element spacing of 41 by 44 mm. These are also the cross section dimensions of the module. The cross-polarization of the microstrip patch antenna is reduced by feeding the two probes of the patch simultaneously. The ratrace, which is used as a splitter, has also other useful properties. Finally a monitoring channel is implemented for the internal calibration of the antenna system.
TNO Identifier
94923
Publisher
VDE-Verlag
Source title
EUSAR '96 - European Conference on Synthetic Aperture Radar, 26-28 March 1996, Königswinter, Germany
Place of publication
Berlin, Germany
Pages
539-542
Files
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