| Autor: |
Paquay, M.H.A., Vermeulen, B.C.B., Koomen, P.J., Hoogeboom, P., Snoeij, P., Pouwels, H. |
| Přispěvatelé: |
TNO Fysisch en Elektronisch Laboratorium |
| Jazyk: |
angličtina |
| Rok vydání: |
1996 |
| Předmět: |
|
| Zdroj: |
COST 245-ESA Workshop on Active Antennas, 27-28 June 1996, ESTEC, Noordwijk, The Netherlands, 257-262 |
| Popis: |
In the Netherlands, a polarimetric C-band aircraft SAR (Synthetic Aperture Radar) has been developed. The project is called PHARUS, an acronm for PHased ARray Universal SAR. This instrument serves remote sensing applications. The antenna system contains 48 active modules (expandable to 96). A module is composed of a Transmit/Receive section, a dual polarized microstrip patch antenna and these parts are connected via a ratrace or hybrid ring. Every module can be replaced without disassembling a major part of the antenna. The required scan range of the antenna is in azimuth +/- 20" and in elevation scan +/- l5'. With a center frequency of 5.3 GHz (î, = 56 mm) this results in an element spacing of 4l by 44 mm which are also the cross section dimensions of the module. The necessary miniaturization is reached by using MMIC-technology extensively. For the radiator a microstip patch antenna has been choosen for its flat and lighweight structure. The cross-polarization of the microstrip patch antenna is reduced by feeding the two probes simultaneously. The ratrace, which is used as a splitter, has also other useful properties. Finally, for the intrnal calibration a monitoring channel is implemented. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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