Parameter design method for quasi-uniform array element spacing millimeter wave series-feed microstrip antenna with low side lobe level

Abstract

The invention discloses a parameter design method for a quasi-uniform array element spacing millimeter wave series-feed microstrip antenna with a low side lobe level. Electromagnetic field full wave simulation software and a DEA (Differential Evolution Algorithm) are combined to carry out the joint optimization of an antenna parameter. Under a situation that a constraint condition is given, the optimal solutions of antenna array element spacing, the resonance length of the array element and array element width are obtained. The DEA is adopted, and wave beam width, a wave beam deflection angle,the antenna array element spacing, the resonance length of the array element and the relative width of the array element are input as optimized constraint conditions. The series-feed microstrip antenna realized by the parameter has the characteristic of low side lobe level. Compared with an equal-spacing Chebyshev ideal point source array, the quasi-uniform array element spacing series-feed microstrip antenna is characterized in that the side lobe level of the quasi-uniform array element spacing series-feed microstrip antenna is close to the side lobe level given by a Chebyshev theory resolution under a situation of the same wave beam width.

Description

technical field [0001] The invention relates to a parameter design method of a millimeter-wave low-sidelobe-level series-fed microstrip antenna with a quasi-uniform array element spacing; based on a currently widely used series-fed microstrip antenna structure, the electromagnetic field full-wave simulation software is combined with a differential evolution algorithm (Differential Evolution Algorithm, DEA) jointly optimizes the spacing, array element width, and array element length of antenna elements, and belongs to the field of antenna technology. Background technique [0002] Antenna is an important part of wireless mobile communication system. With the rapid development of the fifth-generation mobile communication and the development and application of millimeter-wave frequency bands, there is an urgent need for millimeter-wave frequency band antennas with small size, low cost, high gain, and easy integration. Microstrip antennas have the advantages of easy conformality...

AI Technical Summary

Problems solved by technology

However, in the millimeter-wave frequency band, the mutual coupling effect between array elements and the parasitic radiation of the microstrip feeder are more obvious, and the width of the array element is not proportional to the amplitude of the array element. Manually adjust or use the electromagnetic field full-wave simulation software that comes with The optimization method can not achieve a given current amplitude distribution by adjusting the array element width

Therefore, in the case of narrow beams, it is impossible to obtain sidelobe levels close to the theoretical solutions of Chebyshev distribution or Taylor distribution at the same time

That is to say, the sidelobe level optimized by the electromagnetic field full-wave simulation software is often far from the sidelobe level given by the Chebyshev distribution theory or the Taylor distribution theory solution.

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