Far-Field Reconstruction of Electrically Large Antennas By Sequential Sampling Method In Cylindrical Measurement Technique

سال انتشار: 1400
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 144

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تاریخ نمایه سازی: 24 آبان 1400

چکیده مقاله:

Cylindrical scanning is a well-established indirect measurement technique to characterize a wide range of antennas such as fan-beam antennas and phased array antennas with versatile radiation patterns. Cylindrical scanning technique which is based on nearfield-to-far-field transformation of cylindrical mode coefficients (CMCs), cannot predict the antenna radiation pattern with a very narrow beamwidth in azimuth plane accurately because remarkable error occurs during the calculation of the derivate of higher-order Hankel functions in CMCs extraction. We aim to address this issue and introduce a simple yet rigorous technique namely sequential sampling method (SSM) in conjunction with two-dimensional Fast Fourier technique (۲D-FFT) to efficiently calculate the far-field radiation pattern of a super directive antenna with narrow beamwidth in azimuth plane. Briefly, the SSM offers several sequences of progressive azimuth angles and the corresponding order of Hankel functions in such a way that CMCs fully span a ۳۶۰ degrees of azimuth angles ( ) in a cylindrical coordinate system in each sequence. Afterwards, by putting the far-field obtained by these sequences together, the final radiation pattern will have high angular resolution. For verifications, the far-field radiation pattern of an electrically large slot array antenna including ۸۱×۱۵ slots are calculated at ۸.۷۵ GHz by this technique and the results are compared by far-field pattern obtained from array theory. The results show that the azimuthal pattern can accurately be measured as small as ۰.۱ resolution by SSM.


Majid Karimipour

Department of Electrical Engineering Arak University of Technology Arak. Iran