Shaped-Beam Circularly-Polarized Practical Antenna Array for Land Imaging SAR Systems
Keywords:
Axial ratio, beam shaping, cosecant squared, microstrip patch antenna, planar antenna arrays, PSO, synthetic aperture radarAbstract
A planar array of M × N circularly polarized microstrip patch antennas is proposed for high resolution land-imaging applications using an airborne side-looking Synthetic Aperture Radar (SAR) systems. The microstrip patch is designed to produce either right-hand or lefthand circular polarization. The planar array is designed to produce a circularly polarized three-dimensional beam of cosecant-squared shape in the range direction and uniform shape in the azimuth direction. The mutual coupling between the adjacent patches in the proposed array is studied for the assessment of the final array design and is shown to have no bad effects on the resulting beam shape or the array performance. A computationally efficient Particle Swarm Optimization (PSO) algorithm is developed and applied to find the amplitude and phase distributions of the feeding voltages over the planar array elements required to produce the desired radiation patterns. This technique is achieved by developing a fast algorithm to extend the amplitudes and phases calculated for M-element and N-element linear arrays to be applied to the elements of a two-dimensional M × N planar array without the need to apply the PSO to calculate the amplitudes and phases for the entire elements of the planar array. A perfect three-dimensional pattern with the desired shapes in both azimuth and range directions is achieved. The input impedance, the axial ratio and the shapes of the radiation patterns produced by the proposed antenna array are investigated and shown to be satisfactory over the frequency band of 3.91 − 4.11 GHz.
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References
Y. Kim and R. Jordan, “Spaceborne SAR antennas for earth science,” Spaceborne Antennas for Planetary Exploration, pp. 305-340, 2006.
A. K. Behera, A. Ahmad, S. K. Mandal, G. K. Mahanti, and R. Ghatak, “Synthesis of cosecant squared pattern in linear antenna arrays using differential evolution,” In Information and Communication Technologies (ICT), IEEE Conference, pp. 1025-1028, 2013.
A. Freeman, et al., “Detection, estimation and correction of Faraday fotation in linearly polarized SAR backscatter signatures,” 1998.
P. Rizki Akbar, J. Tetuko S. S., and H. Kuze, “A novel circularly polarized synthetic aperture radar (CP-SAR) system on board a spaceborne platform,” International Journal of Remote Sensing, vol. 31, no. 4, pp. 1053-1060, Feb. 2010.
J. Tetuko S. S., V. C. Koo, T. S. Lim, T. Kawai, T. Ebinuma, Y. Izumi, M. Z. Baharuddin, and S. Gao, “Development of circularly polarized synthetic aperture radar on-board UavJX-1,” International Journal of Remote Sensing, pp. 2745-2756, 2017.
J. Tetuko, S. Sumantyo, and K. V. Chet, “Development of synthetic aperture radar on board unmanned aerial vehicle,” Geoscience and Remote Sensing Symposium (IGARSS, IEEE International), pp. 2301-2304, 2013.
M. A. Rahman, Q. D. Hossain, and E. N. I. Toyoda “Design of an X-band microstrip array antenna for circular polarization,” 8th International Conference on Electrical and Computer Engineering, 20-22, Dec. 2014.
K. K. Chan, A. Tan, and K. Rambabu, “Decade bandwidth circularly polarized antenna array,” IEEE Transactions on Antennas and Propagation, vol. 61, no. 11, Nov. 2013.
X. Ye, M. He, P. Zhou, and H. Sun, “A compact single-feed circularly polarized microstrip antenna with symmetric and wide-beamwidth radiation pattern,” International Journal of Antennas and Propagation, Hindawi Publishing Corporation, 2013.
Nasimuddin, Z. N. Chen, and X. Qing, “Asymmetric-circular shaped slotted microstrip antennas for circular polarization and RFID applications,” IEEE Trans. Antennas Propagation, vol. 58, no. 12, Dec. 2010.
J. James, Handbook of Microstrip Antennas. vol. 1, IET, 1989.
A. Qing, Differential Evolution. Fundamentals and Applications in Electrical Engineering.John Wiley & Sons (Asia) Pte Ltd., pp. 335-351, 2009.
F. J. Ares Pena, J. A. Rodriguez-Gonzalez, E. Villanueva-Lopez, and S. R. Rengarajan, “Genetic algorithms in the design and optimization of antenna array patterns,” IEEE Trans. Antennas Propag., vol. 47, pp. 506-510, Mar. 1999.
J. A. Rodriguez, L. Landesa, J. L. Rodriguez Obelleiro, F. Obelleiro, F. Ares, and A. GarciaPino, “Pattern synthesis of array antennas with arbitrary elements by simulated annealing and adaptive array theory,” Microw. Opt. Technol. Lett., vol. 20, no. 1, pp. 48-50, Jan. 1999.
L. Xie, Y. Li, and Y. Zheng, “A wide axial-ratio beamwidth circularly polarized microstrip antenna,” IEEE International Conference, 2016.
J. Robinson and Y. R. Sammi, “Particle swarm optimization in electromagnetics,” IEEE Transactions on Antennas and Propagation, vol. 52, no. 2, pp. 397-407, Feb. 2004.
M. Abo El-Hassan, K. F. A. Hussein, A. E. Farahat, and K. H. Awadalla, “Wide band shaped beam array of U-slot patches for high resolution SAR and satellite communications,” 34th National Radio Science Conference (NRSC 2017), Arab Academy for Science, Technology & Maritime Transport, (Abou Qir), Alexandria, Egypt, B14, Mar. 13-16, 2017.
W. L. Stutzman and G. A. Thiele, Antenna Theory and Design. 3rd Edition, Wiley, New York, pp. 319, 2012.
V. Wissan, “Development of circularly polarized array antenna for synthetic aperture radar sensor installed on UAV,” Progress in Electromagnetics Research, 19, pp. 119-133, 2011.
M. Baharuddin, “Study on circularly polarized synthetic aperture radar: Patch array antennas and scattering experiments in an anechoic chamber,” Ph.D. Thesis, Chiba University, 2016.
