Planar Uda-Yagi antenna for imaging SAR system

Planar antennae manufactured on typical dielectric substrates have many essential advantages. One of them is mechanical strength that is very important as far as airborne application is concerned. Radar imaging systems using synthetic aperture technology (SAR) do not impose exaggerated requirements for an antenna bandwidth or gain but its mechanical properties as well as phase and frequency characteristics stability are the key features. In the paper the planar Uda-Yagi antenna being able to work close to perpendicular metal plate surface (e.g. fuselage) at center frequency 3 GHz is described. It was designed analytically adapting Uda-Mushiake model for mutual impedances calculation and finite difference time domain (FDTD) simulation system. Alongside analytical and numerical results the practical realization as well as preliminary measurements are shown.

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