Advances in Characterizing Complex Frequency Responses of Frequency Converting Payloads in Planar Near-Field Test Ranges

Authors: Patrick Pelland, Daniël Janse van Rensburg, Edwin Barry
Publication: EuCAP 2019
Copyright Owner: EurAAP

This paper provides an overview of a planar near-field test methodology for measuring typical system level characteristics of transceiver payloads. Measuring parameters such antenna gain, equivalent isotropic radiated power, saturating flux density, group delay and channel frequency response is the objective. We describe how transfer functions are derived for the antennas in question, allowing one to compensate for the fact that measurements are being performed in the near-field of both uplink and downlink antennas. Practical implementation aspects like near-field probe selection, probe positioning and RF sub-system modification are addressed. We also present a concept simulated payload, since this is critical to system verification and facility-to-facility comparison.

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Copyright 2019 EurAAP. Reprinted from EuCAP 2019

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Test Environments for 5G Millimeter-Wave Devices

Author: Brett T. Walkenhorst
Publication: EuCAP 2019
Copyright Owner: EurAAP

As 5G systems are developed and deployed, the RF devices comprising these networks require various types of tests at multiple stages of the design and manufacturing processes. The use of millimeter-wave frequencies and massive MIMO, a combination of technologies intended to ensure sufficient bandwidth and SNR to support massive data throughput, is leading to unprecedented levels of integration of antenna arrays and transceivers. Testing these highly integrated devices is becoming increasingly complex and challenging. In this paper, we investigate various test environments for 5G over-the-air (OTA) testing including far-field, compact range, and near-field chambers. We examine the advantages and disadvantages of each for measuring various over-the-air (OTA) test metrics. This paper offers a high-level trade study by broadly analyzing cost, path loss, and applicability of each environment to different types of OTA tests.

You have requested a Reprint of an EurAAP Paper

Copyright 2019 EurAAP. Reprinted from EuCAP 2019

This material is posted here with permission of the EurAAP. Such permission of the EurAAP does not in any way imply EurAAP 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 EurAAP.

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Measuring a 5G Millimeter-Wave Device’s Spherical Coverage

Authors: Brett T. Walkenhorst, Prasadh Ramachandran
Publication: EuCAP 2019
Copyright Owner: EurAAP

A new over-the-air (OTA) metric called “spherical coverage” is being discussed in 3GPP. The concept is to test the ability of a device to reliably form beams in any direction, offering connectivity in any orientation and polarization. In this paper, we analyze the effectiveness of various test environments for testing spherical coverage at millimeter-wave frequencies for 5G devices.

You have requested a Reprint of an EurAAP Paper

Copyright 2019 EurAAP. Reprinted from EuCAP 2019

This material is posted here with permission of the EurAAP. Such permission of the EurAAP does not in any way imply EurAAP 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 EurAAP.

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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

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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