Optimization And Evaluation Of The Quiet Zone Of Compact Antenna Test Range Based On Physical Optics

With the continuous updating of wireless communication technology and 5G mobile communication equipment,antenna measurement technology has also been rapidly developed.Compact Antenna Test Range(CATR)test technology is a significant way in the field of antenna measurement.A CATR measurement system with good performance can meet the key requirements of three aspects:measurement distance,measurement environment,and measurement equipment in antenna measurement.Based on theoretical derivation,this paper proposes a dual-bias reflective compacted field design method and its quiet zone performance optimization technology;for the phase that is difficult to accurately measure the quiet zone of the compact field,a phase recovery algorithm is proposed and verified by simulation.The designed compaction field and the effectiveness of the phase recovery algorithm.The author's main research work is divided into the following four aspects:1.An ideal Gaussian feed with miniaturization and good radiation characteristics is designed.Based on the plane wave expansion theory,the radiation characteristics of the ideal Gaussian feed are reconstructed.The results show that the spectrum power of the plane wave expansion relative to the actual feed spectrum power accounts for 99.997%when the beam cone angle is 60 degrees,which is almost complete.Simulate an ideal Gaussian feed.2.A method for constructing the compact field of the double-biased reflector and an optimization method for the performance of the quiet zone are proposed.For the double-biased reflector compacted field system designed in this paper,a cosine crimp structure and a sawtooth edge structure are designed.The results show that the optimized quiet zone amplitude fluctuates around 0.7 dB,and the effective utilization rate of the quiet zone reaches 70%.The amplitude of the quiet zone cross-polarization isolation is greater than 50 dB,and the quiet zone performance meets the industry design standard of the compact field.3.Verify the applicability of the compact field designed in this article in the 5G mobile communication frequency bands(FR1 frequency band and FR2 frequency band).The simulation results verify the correctness of the compact field in terms of geometric structure and edge processing,and the feasibility of 5G mobile communication frequency band equipment using the compact field for testing.4.Propose an algorithm for phase recovery in the quiet zone of the compressed field,namely the TIE-HIO phase recovery algorithm.The algorithm combines the intensity propagation equation(TIE)with the hybrid input output(HIO)algorithm.The simulation results show that the phase deviation of the static zone of the compressed field recovered by the algorithm and the actual phase deviation is within the range of ±2°.The analysis shows that the phase recovery of this article The algorithm has the characteristics of fast convergence and high restoration accuracy,which verifies the reliability of the phase recovery algorithm.