Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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By C. Edi Santosa, J. T. Sri Sumantyo, C. Ming Yam, K. Urata, K. Ito, and S. Gao

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This paper presents the design and realization of a 4 × 4 broadband circularly polarized microstrip antenna as subarray element for airborne C-band circularly polarized synthetic aperture radar (CP-SAR). The main objective of this work is to optimize impedance bandwidth, axial-ratio bandwidth, gain, and radiation pattern of a CP-SAR array antenna due to the limitation in the available space for a large array antenna installation on airborne platform. Various patch separations in uniformly 2 × 2 subarray configuration have been simulated to investigate characteristics of impedance bandwidth, axial-ratio bandwidth, gain, and radiation pattern. In order to broaden the impedance bandwidth, the proposed antenna is constructed by stacking two thick substrates with low dielectric constant and dissipation factor. The measured 10-dB impedance bandwidth is 0.91 GHz (17.2%), spanning from 4.83 GHz to 6.01 GHz. A simple square patch with curve corner-truncation is applied as the main radiating patch for circularly-polarized wave generation. The radiating patch is excited by single-fed proximity coupled strip-line feeding. The improvement of axial-ratio bandwidth in 2 × 2 and 4 × 4 subarray is employed by a feeding network with serial-sequential-rotation configuration. Experimental result shows the 3-dB axial-ratio bandwidth achieved 1.18 GHz (22.17%) from 4.8 GHz to 5.71 GHz. Other characteristic parameters such as gain and radiation pattern of the 4 × 4 subarray antenna are also presented and discussed.

C. Edi Santosa, J. T. Sri Sumantyo, C. Ming Yam, K. Urata, K. Ito, and S. Gao, "Subarray Design for C-Band Circularly-Polarized Synthetic Aperture Radar Antenna Onboard Airborne," Progress In Electromagnetics Research, Vol. 163, 107-117, 2018.

1. Curlander, J. C. and R. N. McDonough, Synthetic Aperture Radar System and Signal Processing, A John Willey and Sons Inc., Canada, 1991.

2. Ouchi, K., "Recent trend and advance of synthetic aperture radar with selected topics," Remote Sensing, 716-807, 2013.

3. Gail, W. B., "Effect of faraday rotation on polarimetric SAR," IEEE Int. Transaction on Aerospace and Electronic System, Vol. 34, 301-307, 1998.

4. Sri Sumantyo, J. T., K. V. Chet, L. T. Sze, T. Kawai, T. Ebinuma, Y. Izumi, M. Z. Baharuddin, S. Gao, and K. Ito, "Development of circular polarized synthetic aperture radar onboard UAV JX-1," International Journal of Remote Sensing, Vol. 38, 2745-2756, 2017.

5. Gao, S., Q. Luo, and F. Zhu, Circularly Polarized Antenna, John Willey and Sons, 2014.

6. Balanis, C. A., Antenna Theory Analysis and Design, 3th Ed., John Wiley and Sons, New Jersey, 2005.

7. James, J. R. and P. S. Hall, Handbook of Microstrip Antennas, Peter Peregrinus Ltd, London, UK, 1989.

8. Carver, K. R. and J. W. Mink, "Microstrip antenna technology," IEEE Transactions on Antennas and Propagation, Vol. 29, No. 1, 2-24, 1981.

9. Granholm, J. and K. Woelders, "Microstrip antenna array for airborne high-performance, polarimetric SAR system," Symposium on Antennas Technology and Applied Electromagnetics, 643-650, 1998.

10. Brockett, T. J. and Y. R. Samii, "Subarray design diagnostics for the suppression of undesirable grating lobes," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 3, 1373-1380, 2012.

11. Pozar, M. D. and B. Kaufman, "Design consideration for low sidelobe microstrip arrays," IEEE Transactions on Antennas and Propagation, Vol. 38, No. 8, 1176-1185, 1990.

12. Davidson, K., Y. Antar, and A. Freundorfer, "A wideband via fed circularly polarized microstrip antenna on a multi-layer substrate," IEEE Antennas and Propagation Society International Symposium, APS-URSI, 2013.

13. Yang, W., J. Zhou, Z. Yu, and L. Li, "Single-fed low profile broadband circularly polarized stacked patch antenna," EEE Transactions on Antennas and Propagation, Vol. 62, No. 10, 5406-5410, 2014.

14. Hall, P. S., J. S. Dahele, and J. R. James, "Design principles of sequentially fed, wide bandwidth, circularly polarized microstrip antennas," IEE Proceedings H --- Microwaves, Antennas, and Propagation, Vol. 136, 381-389, 1989.

15. Hu, Y. J., W. P. Ding, and W. Q. Cao, "Broadband circularly polarized microstrip antenna using equentially rotated technique," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 1358-1361, 2011.

16. Ding, K., C. Gao, T. Yu, D. Qu, and B. Zhang, "Gain-improved broadband circularly polarized antenna array with parasitic patches," IEEE Antennas and Wireless Propagation Letters, Vol. 16, 1468-1471, 2017.

17. Sumantyo, J. T. S., "Progress on development of synthetic aperture radar onboard UAV and microsatellite," IEEE International Geoscience and Remote Sensing Symposium, 1081-1084, 2014.

18. Baharuddin, M. Z. and J. T. S. Sumantyo, "Suppressed side-lobe, beam steered, C-band circular polarized array antenna for airborne synthetic aperture radar," Journal of Unmanned System Technology, Vol. 4, No. 1, 2016.

19. Edi Santosa, C. and J. T. Sri Sumantyo, "Development of a low profile wide-bandwidth circularly polarized microstrip antenna for C-band airborne CP-SAR sensor," Progress In Electromagnetics Research C, Vol. 81, 77-88, 2018.

20. Hansen, R. C., Phased Array Antennas, John Wiley and Sons, 1998.

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