Array Antenna for Synthetic Aperture Radar Operating in X and Ku-Bands: A Study to Enhance Isolation Between Radiation Elements

Konferenz: EUSAR 2018 - 12th European Conference on Synthetic Aperture Radar
04.06.2018 - 07.06.2018 in Aachen, Germany

Tagungsband: EUSAR 2018

Seiten: 5Sprache: EnglischTyp: PDF

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Alibakhshikenari, Mohammad; Limiti, Ernesto (Electronics Engineering Department, University of Rome “Tor Vergata”, Via del politecnico 00133, Rome, Italy)
Virdee, Bal S. (London Metropolitan University, Center for Communications Technology & Mathematics, School of Computing & Digital Media, London N7 8DB, UK)
See, Chan H. (School of Engineering Department, University of Bolton, Deane Road, Bolton, BL3 5AB, UK)
Abd-Alhameed, Raed (School of Electrical Engineering & Computer Science, University of Bradford, UK)
Falcone, Francisco (Electric and Electronic Engineering Department, Universidad Pública de Navarra, Spain)

Modern synthetic aperture radars (SAR) require a system bandwidth of greater than 1 GHz. Waveguide slot antennas are popular for use in SAR applications because of their inherent advantages, namely high efficiency and power handling capability, but such antennas have a limited bandwidth. Although the bandwidth of slot antennas can be broadened by using ridge waveguides however this approach introduces manufacturing complexity and is costly. A novel solution is presented in this paper to realise a large bandwidth by using 2x3 array antenna where the mutual coupling between the radiating elements is suppressed by inserting an isolation wall between the radiating elements. The isolation wall comprises three intercoupled U-shaped microstrip transmission-lines. With this technique the antenna’s bandwidth for VSWR<1.5 is greater than 2 GHz inside the X- and Ku-bands.