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Design, optimization, and validation of a planar nine-element Quasi-Yagi antenna array for X-band applications [Antenna designer's Notebook]

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1 Author(s)
Weinmann, F. ; FGAN-FHR Res. Inst. for High Frequency Phys. & Radar Tech., Wachtberg

A planar antenna array, based on nine identical quasi-Yagi elements, is presented in this paper. Contrary to conventional designs, the feeding network is composed of three-way power dividers, which are carefully designed in order to provide synchronized output signals over a wide frequency range. The use of spline-shaped microstrip lines suppresses coupling effects by parallel lines. Thus, signal distortions within the feeding network are minimized. Compared to conventional designs with eight elements, the additional antenna element will enhance the gain of the array, which is between 10.5 dBi and 13 dBi in the X band. The input return loss of the antenna array is below -15 dB over most parts of the relevant spectrum, with a total bandwidth of 45%. The planar antenna array is well suited as a radiating element in linear phased arrays for multifunction radars, including SAR and MTI. Additionally, the suitability of this antenna for phased-array applications is studied by an experimental setup consisting of five antenna plates.

Published in:

Antennas and Propagation Magazine, IEEE  (Volume:49 ,  Issue: 2 )

Date of Publication:

April 2007

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