2019 Technical Papers

Customized Spherical Near-Field Test Time Reduction for Wireless Base Station Antennas

Authors: E’qab Almajali, Daniël J. van Rensburg, Derek A. McNamara
Publication: IEEE Antennas and Wireless Propagation Letter, Vol. 18, No. 1, January 2019
Copyright Owner: IEEE

Effective spherical near-field (SNF) test time reduction approaches are presented for wireless base station antennas that have widely differing beamwidths in the azimuth and elevation planes. The geometry of these antennas allows for the optimization of the SNF angular sampling density by allowing a lower sampling density along one of the acquisition axes. This is validated experimentally and shown to reduce the SNF test time significantly without degrading the measurement accuracy.

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Copyright 2019 IEEE. Reprinted from IEEE Antennas and Wireless Propagation Letter, Vol. 18, No. 1, January 2019

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A Method for the Measurement of RF Absorber using Spectral Domain Transformations

Author: Vince Rodriguez, Brett Walkenhorst, Jorgen Bruun
Publication: APS 2019
Copyright Owner: IEEE

Indoor antenna ranges must have the walls, floor and ceiling treated with RF absorber. Pyramidal absorber is shaped to create an impedance transform from free space to that of the absorbing material. The pyramidal shape provides this very effectively for normal incidence, but performance typically gets worse as the angle of incidence deviates from normal. Unfortunately, it is difficult to measure reflectivity at large oblique angles because of difficulty differentiating the reflected signal from that of the direct path. In this paper, a novel approach for performing such measurements is introduced. Preliminary measurements are compared to RF simulations. The comparison appears to indicate that this approach is a valid way to perform RF absorber measurements at wide angles.

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Copyright 2019 IEEE. Reprinted from 2019 IEEE AP-S Symposium.

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3:1 Bandwidth Dual Polarized Feeds for Compact Range and Near-Field Probes

Author: German Cortes-Medellin, Brett T. Walkenhorst
Publication: APS 2019
Copyright Owner: IEEE

The authors have developed a new family of dualpolarized compact range feeds with a bandwidth ratio of 3:1. These feeds are also suitable for use as near-field probes.

You have requested a Reprint of an IEEE-AP-S Paper

Copyright 2019 IEEE. Reprinted from 2019 IEEE AP-S Symposium.

This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of NSI-MI Technologies' products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org.

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