volume | PIER Journals

Abstract

Primary insertion phase delay (IPD) expression is obtained using the flat plate model with plane wave incidence, and it only considers the longitudinal phase shift in the free space. This causes errors in large curvature radome applications since the longitudinal distance that wave travels in flat plate cannot represent the actual distance. Therefore, the IPD expression for radomes with large curvature should be defined. Based on the ray tracing in the radome medium, a modified IPD expression with more accurate transmission distance for large curvature radomes is proposed. The proposed expression can be applied to radomes with arbitrary curvature. The correctness of our proposed expression is verified via a simplified fast radome analytical model. The results from the proposed expression show errors within 1.0° for the parabolic radome system. The proposed expression can be applied to optimize the performance of radome systems with large curvature. A reflector antenna radome system is employed for verification. Results show that using the modified IPD expression to optimize the reflector antenna can increase the system gain by 1.8 dB, reduce the side lobe by 7.6 dB, and narrow the beamwidth by 0.9°.

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Ms. Pei Jia

Prof. Yong-Jun Xie

Dr. Chunyu Li

Dr. Ke Pang

Dr. Zhiping Li

Dr. Jiahui Zhao

Dr. Peiyu Wu