Effect of radiation surface error in multi-scales on planar waveguide slotted arrays in Ku-band

摘要

This paper investigates effect of radiation surface error on the electrical properties of waveguide slotted arrays. For the waveguide slotted arrays working in Ku band, the radiation surface error caused by exterior loads and processing contains three components in different scales. Power spectrum conversion and Gaussian filtering are applied to error components separation, and three kinds of statistical models are introduced for error modelling. The multi-scale error model is obtained by weighted stacking. Based on the error model, effective mechanism formulations are developed with errors through the analysis of the positional difference of radiating slots in the aperture field. As a method of verification, an antenna prototype is manufactured and tested. A novel simulation method is proposed, which is tested by a contrast experiment on radiating surface's flatness. A comparison between results of the multi-scale error model and test data to the ideal case indicates that the proposed error model is closer to the test data. Influence degrees of all error components in different scales are compared and discussed. Reducing the error in the manufacturing process is an effective way to make sure the design accuracy of arrays, reduce production costs and shorten production cycles.