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Dual polarization stacked microstrip patch antenna array with very low cross-polarization

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2 Author(s)
Granholm, J. ; Dept. of Electromagn. Syst., Tech. Univ. Denmark, Lyngby, Denmark ; Woelders, K.

This paper describes the development and performance of a wideband dual linear polarization microstrip antenna array used in the Danish high-resolution airborne multifrequency polarimetric synthetic aperture radar, EMISAR. The antenna was designed for an operating frequency of 1.25 GHz±50 MHz and was built as an array of 8×2 probe-fed stacked microstrip patches. The feeding network is constructed in microstrip and is capable of handling 6 kW of peak input-power at an altitude of 45000 ft (unpressurized). The impedance bandwidth (return loss better than -14 dB) of the antenna is 10%, the isolation between the horizontal and the vertical ports of the array is 50 dB and the cross-polarization suppression is 40 dB. A new design principle for simultaneously achieving very low cross-polarization and low side lobes in dual linear polarization antenna arrays has been applied

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Antennas and Propagation, IEEE Transactions on  (Volume:49 ,  Issue: 10 )