Gimbals For Antenna & Radome Measurement: Demanding Applications Drive Innovative Architecture, Remarkably Higher Accuracy

Authors: J Mark Hudgens, George M. Cawthon
Publication: AMTA 2014
Copyright Owner: NSI-MI Technologies

For the purposes of antenna or radome measurement, a gimbal may be thought of as a compact, two or three axis antenna positioner with mutually orthogonal, intersecting axes. The unrelenting demand for higher accuracy in positioners of this type is driving innovation in mechanical architecture and design. Refined position feedback techniques, reflecting enhanced understanding of position errors, and delivering unprecedented native encoder accuracy, have been developed and tested. New mechanical architecture has been created that allows for fullyfeatured two-axis gimbals to exist in the restricted confines behind an aircraft radome. The principal result of these developments is increasingly accurate and capable systems, particularly in the field of radome measurements. These new applications, techniques, architectures, and their results are explored in the following pages.

Multiplexed Pulsed Transmit and Receive RF Measurement System for Active Phased Array Testing

Authors: Kim Hassett & Bruce Williams
Publication: EuCAP 2014
Copyright Owner: IEEE

Radar antennas are typically required to operate in using various transmit and receive conditions, depending on the particular radar mode. In active antenna applications, these modes may require different antenna operating parameters, which currently dictate testing the antenna independently in transmit and receive using different test system configurations. In testing highly-integrated active arrays, electrical and thermal considerations make it desirable to test the antenna in its nominal Tx/Rx (Transmit/Receive) operating mode as opposed to transmit-only or receive-only. An extension to the NSI Panther 9100 RF measurement system has been developed to support multiplexed transmit and receive, pulse-mode measurements with different measurement parameters during the course of a single data acquisition. This capability allows pulsed transmit and receive tests to be interleaved using a single measurement setup, reducing overall test time and improving the real-world accuracy of the test results.

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Copyright 2014 IEEE. Reprinted from EuCAP 2014 Conference.

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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Narrow Pulse Measurements on Vector Network Analyzers

Author: Bert Schluper
Publication: AMTA 2014
Copyright Owner: NSI-MI Technologies

This paper investigates practical aspects of measuring antennas operating with pulsed RF signals of very narrow width, down to 0.1 μs or less. The current generation of network analyzers provides very high IFBW, theoretically allowing measurement of very narrow pulses. But in practice there are several factors that limit the minimum pulse width, including IF path filtering, receiver dynamic range, trigger synchronization issues and test/reference path delays. The paper will compare the performance of both narrow-band and wideband pulse measurements on a Keysight PNA.

Parametric Study of Probe Positioning Errors in Articulated Spherical Near-field Test Systems for mm-Wave Applications

Authors: Daniël Janse van Rensburg, Stuart F. Gregson
Publication: 2014 IEEE CAMA Conference
Copyright Owner: IEEE

This paper describes an articulated arm spherical near-field scanner design which transports a probe over a hyperhemispherical surface that surrounds a stationary test antenna. Surface profile data collected with a laser tracker is presented and a parametric study performed to investigate the viability of testing at mm-wave frequencies is described. Parameters such as probe radial distance, and angular positioning are investigated to assess to what extent spherical near-field testing can be performed using this structure.

You have requested a Reprint of an IEEE Paper Copyright 2014 IEEE. Reprinted from 2014 IEEE CAMA Conference.

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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Scaled Model Measurements of HF Antenna for Vehicular Platforms

Authors: Saurabh Sanghai, Maxim Ignatenko, Kim Hassett and Dejan S. Filipovic
Publication: AMTA 2014
Copyright Owner: NSI-MI Technologies

Introduction, Vertical Half-Loop Antenna, Inverted-L Antenna, Scaled Model Design, Measurements, Summary

Short Note On The Use Of Spherical Modal Filtering to Remove RF Leakage From SNF Measurements

Authors: Jeffrey A. Fordham, David Musser
Publication: EuCAP 2014
Copyright Owner: IEEE

Near-field antenna measurement accuracy is reduced by various factors associated with the antenna test range environment and instrumentation hardware used. One such factor is associated with energy leakage in the RF hardware used in the measurement. In spherical near-field measurements, the sidelobe accuracy can be greatly impacted by RF leakage.

In this brief note on the use of spherical modal filtering and the IsoFilterTM technique, it will be shown how the IsoFilterTM technique can be used to reduce the impact of leakage and stray signals in spherical near-field measurements.

You have requested a Reprint of an IEEE Paper

Copyright 2014 IEEE. Reprinted from EuCAP 2014 Conference.

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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Truncation Study for Design of a Large Spherical Near-Field Antenna Test System

Author: Daniël Janse van Rensburg
Publication: ANTEM 2014 Conference
Copyright Owner: IEEE

A truncation study is presented to assess the impact of theta truncation in a spherical near-field antenna test system. The study is relevant for antennas with broad beams in the plane of truncation and where antenna weight prevents alternate mounting options, while facility space limitations necessitate truncation.

You have requested a Reprint of an IEEE Paper

Copyright 2014 IEEE. Reprinted from ANTEM 2014 Conference.

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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