volume | PIER Journals

Abstract

A W-band dual-circular-polarization (dual-CP) monopulse Cassegrain antenna for polarization detection of radar target is presented in this letter. The proposed antenna consists of a main reflector, a sub reflector, a dual-CP feed source based on the septum polarizer, and a comparator. Two orthogonal circular-polarized signals [left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP)] electromagnetic wave can be transmitted and received simultaneously by this antenna. The principle of the antenna is introduced and analyzed, and then a prototype of the antenna is simulated, fabricated, and measured. Measured results are in good agreement with the simulated ones. At 94 GHz, the gains of the LHCP and the RHCP sum beam (SUM beam) are 38.6 dBi and 38.8 dBi counting the insertion loss of the comparator, which indicates that the radiation efficiency is better than 44.2%. The 3-dB beamwidth is about 1.5° with a sidelobe level (SLL) of -16.6 dB, and the axial ratio is lower than 1.43. A null depth of -26 dB for the difference beam (DIFF beam) is observed, and the gain ratio between the LHCP monopulse beams is 5.9 dB. Measured results demonstrate that the proposed antenna is very applicable in the polarization detection of radar target at W-band.

1. Aboserwal, N., J. L. Salazar-Cerreno, and Z. Qamar, "An ultra-compact X-band dual-polarized slotted waveguide array unit cell for large E-scanning radar systems," IEEE Access, Vol. 8, 210651-210662, 2020.
doi:10.1109/ACCESS.2020.3038485 Google Scholar

2. Wang, Y. and V. Chandrasekar, "Polarization isolation requirements for linear dual-polarization weather radar in simultaneous transmission mode of operation," IEEE Trans. Geoscience and Remote Sensing, Vol. 44, 2019-2028, 2006.
doi:10.1109/TGRS.2006.872138 Google Scholar

3. Lv, J., M. Su, and Y. Liu, "Broadband dual-polarized mm-Wave antenna array with grating structure for mobile devices," IEEE Trans. Antennas Propagat., Vol. 22, 273-277, 2023.
doi:10.1109/LAWP.2022.3208908 Google Scholar

4. Giuli, D., "Polarization diversity in radars," Proceedings of the IEEE, Vol. 74, 245-269, 1986.
doi:10.1109/PROC.1986.13457 Google Scholar

5. Cloude, S. R. and E. Pottier, "A review of target decomposition theorems in radar polarimetry," IEEE Trans. Geoscience and Remote Sensing, Vol. 34, 498-518, 1996.
doi:10.1109/36.485127 Google Scholar

6. Yin, J., H. Chen, Y. Li, and X. Wang, "Clutter mitigation based on spectral depolarization ratio for dual-polarization weather radars," IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol. 14, 6131-6145, 2021.
doi:10.1109/JSTARS.2021.3088324 Google Scholar

7. Shen, Y., S. G. Zhou, G. L. Huang, and T. H. Chio, "A compact dual circularly polarized microstrip patch array with interlaced sequentially rotated feed," IEEE Trans. Antennas Propagat., Vol. 64, 4933-4936, 2016.
doi:10.1109/TAP.2016.2600747 Google Scholar

8. Cheng, Y. J., J. Wang, and X. L. Liu, "94 GHz substrate integrated waveguide dual-CP shared- aperture parallel-plate long-slot array antenna with low sidelobe level," IEEE Trans. Antennas Propagat., Vol. 65, 5855-5861, 2017.
doi:10.1109/TAP.2017.2754423 Google Scholar

9. Shu, C., J. B. Wang, S. Q. Hu, Y. Yao, J. S. Yu, Y. Alfadhl, and X. D. Chen, "Wideband dual-CP horn antenna for mmWave wireless communications," IEEE Antennas Wireless Propag. Lett., Vol. 18, 1726-1730, 2019.
doi:10.1109/LAWP.2019.2927933 Google Scholar

10. Dong, Y., R. Xu, Y. H. Yang, and S. G. Zhou, "Compact shared-aperture dual-band dual-circularly-polarized waveguide antenna array operating at K/Ka-band," IEEE Trans. Antennas Propagat., Vol. 71, 443-449, 2023.
doi:10.1109/TAP.2022.3213425 Google Scholar

11. Mahmoud, A. E., W. Hong, Y. Zhang, and A. Kishk, "W-band multilayer perforated dielectric substrate lens," IEEE Antennas Wireless Propag. Lett., Vol. 13, 734-737, 2014.
doi:10.1109/LAWP.2014.2316144 Google Scholar

12. Lorencio, R., J. A. Encinar, R. R. Boix, M. Barba, and G. Toso, "Flat reflectarray that generates adjacent beams by discriminating in dual circular polarization," IEEE Trans. Antennas Propagat., Vol. 67, 3733-3742, 2019.
doi:10.1109/TAP.2019.2905676 Google Scholar

13. Xu, P., L. Li, R. Li, and H. Liu, "Dual-circularly polarized spin-decoupled reflectarray with FSS-back for independent operating at Ku-/Ka-bands," IEEE Trans. Antennas Propagat., Vol. 69, 7041-7046, 2021.
doi:10.1109/TAP.2021.3076518 Google Scholar

14. Kou, P. F. and Y. J. Cheng, "A dual circular-polarized extremely thin monopulse feeder at W-band for prime focus reflector antenna," IEEE Antennas Wireless Propag. Lett., Vol. 18, 231-235, 2019.
doi:10.1109/LAWP.2018.2886905 Google Scholar

15. Zheng, P., G. Q. Zhao, S. H. Xu, F. Yang, and H. J. Sun, "Design of a W-band full-polarization monopulse Cassegrain antenna," IEEE Antennas Wireless Propag. Lett., Vol. 16, 99-103, 2017.
doi:10.1109/LAWP.2016.2558285 Google Scholar

16. Zheng, P., B. Hu, S. Xu, and H. Sun, "A W-band high-aperture-efficiency multipolarized monopulse Cassegrain antenna fed by phased microstrip patch quad," IEEE Antennas Wireless Propag. Lett., Vol. 16, 1609-1613, 2017.
doi:10.1109/LAWP.2017.2653840 Google Scholar

17. Volakis, J., Antenna Engineering Handbook, 4th Ed., McGraw-Hill, 2007.

Dr. Xin Li

Dr. Kun Gao

Dr. Ying-Chao Zhao

Dr. Jian Yuan

Dr. Jie Cheng

Dr. Yuan-Yuan Wang