Document Center | Technical Papers

Primary tabs

Application of the Translated-SWE Algorithm to Echo Reduction of Spherical Near-Field Measurements with Undersampling

Technical Publications
03/29/2017

 In spherical Near Field (NF) measurements postprocessing techniques based on spatial filtering have been presented as promising tools for the mitigation of echoes or stray signals deriving from the surrounding environment. The spatial filtering is very efficient in measurement scenarios with a stationary Antenna Under Test (AUT).

Measurements of Low Gain Antennas at VHF Frequencies for Space-Based AIS Applications

Technical Publications
03/29/2017

Abstract—Measurement of the radiation properties of low gain antennas at VHF frequency is in many cases a challenging task. Measurements performed in shielded anechoic chambers are usually preferred to outdoor ranges because they are not subject to the electromagnetic pollution and less affected by the scattering of the environment.

Link Between Measurement and Simulation Applied to Antenna Scattering and Placement Problems

Technical Publications
03/29/2017

Recent use of measured data as near field sources in Computational Electro Magnetic (CEM) tools has opened the possibility to represent antennas in numerical simulations, even when the antenna characteristics and geometry are unknown and therefore cannot be included in a full wave model [1-4].

Microwave Vision: From RF Safety to Medical Imaging

Technical Publications
03/29/2017

This article gives an overview of the activities of the company Microwave Vision, formerly Satimo, oriented to health-related applications. The existing products in terms of Specific Absorption Rate (SAR) measurement and RF safety are described in detail. The progress of the development of a new imaging modality for breast pathology detection using microwaves is shortly reported. 

Comparative Investigation of Spherical NF Measurements with Full and First Order Probe Correction Using Calibrated or Simulated Probe

Technical Publications
03/29/2017

Accurate spherical Near-Field antenna measurements are typically performed compensating for the probe pattern during the Near-Field to Far-Field transformation. Depending on the complexity of the probe modal content and on the required accuracy, different Probe Correction (PC) techniques can be applied.

Telemetry X-band Antenna Payload for Nano-satellites

Technical Publications
03/29/2017

This paper presents a compact X-band antenna with an isoflux radiation pattern and circular polarization. It consists of a miniaturized helix antenna connected to a stripline circuit that provides a sequential rotation feeding. The antenna is arranged over a vertically corrugated ground plane and it has been optimized for a CubeSat 3U nanosatellite platform.

Measurement Uncertainties in Millimeter Wave “On-Chip” Antenna Measurements

Technical Publications
11/29/2016

This  paper  will  outline  design  requirements and  present  test results  of  60  GHz  Chip Reference  antennas.    Several  dozen antennas have been tested.  The related uncertainties in the micro-probed antenna measurements will be evaluated with particular emphasis on the gain calibration uncertainty.

Echo Reduction with Minimum Sampling in Spherical Near Field Measurements using Translated- SWE Algorithm

Technical Publications
11/29/2016

An  innovative  spherical  NF/FF  transformation algorithm  for  offset  measurements  based  on  a Translated Spherical  Wave Expansion (TSWE) has been recently proposed. In this paper we investigate by experiment the echo reduction properties of offset AUT measurements using TSWE.

Measurements and Numerical Simulations to Enhance the assessment of Antenna Coupling

Technical Publications
11/29/2016

In  this  paper,  a  wide-band  numerical  model of the measured  antenna  is  presented, improving  the accuracy  of  the coupling assessment. The finding are supported by radiated and  conducted measurement  on  the  single  element  and  the array configuration. 

Probe Correction Technique of Arbitrary Order for High Accuracy Spherical Near Field Antenna Measurements

Technical Publications
11/29/2016

Probe  correction  in  standard  spherical  near field measurements are typically limited to probes with |μ|=1 spherical wave spectrum when performing spherical wave expansion. The design of such probes is often a trade-off between achievable performance,  modal  purity  and bandwidth. Compensation techniques for probes with higher or full order modal spectrum have  recently  been  proposed.

Gain Antenna Measurement using Single Cut Near Field Measurements

Technical Publications
11/29/2016

This  paper  presents  a  near-field  antenna  test procedure providing  single  or  double  main plane  patterns  including  the gain.  The procedure  is  applicable  to  antennas,  with separable excitation in the two main planes. The test set-up is based on an azimuth positioner and near to far-field transformation based on expansion in cylindrical modes.

Improving the Cross-Polar Discrimination of Compact Antenna Test Range using the CXR Feed

Technical Publications
11/29/2016

In this paper, the QZ cross-polar reduction properties of the  CXR  feed  is  measured  in  a standard  corner-fed  CATR  in both orthogonal polarization over the full 1.6:1 bandwidth. The advantages of the CXR  in  general measurement  scenarios  are investigated  by measurement  of  an  antenna  with  low  cross-polarization level at different QZ positions and frequencies.

Implementation of a VHF Spherical Near-Field Measurement Facility at CNES

Technical Publications
11/29/2016

This paper presents last implementation of a complete near-field  system  including  probe positioner  upgrades  to  reach positioning repeatability  and  ergonomy,  an  optical  alignment 

tool, a specific reference antenna and a post processing tool.

Minimum Scattering Probe for High Accuracy Planar NF Measurements

Technical Publications
11/29/2016

Dual  polarized  wideband  probes  are convenient for accurate  and  time  efficient Planar  Near Field  (PNF)  antenna testing  [1]-[2].  Traditional probe  designs  are  often bandwidth limited and electrically large leading to high scattering [3]-[4] in PNF  measurements with  short  probe-AUT distances.

60 GHz Reference Chip Antenna for Gain Verification of Millimeter Wave Test Chambers

Technical Publications
11/29/2016

We have developed a 60 GHz chip antenna designed for use as a gain and pattern verification tool in the calibration process of a millimeter wave antenna test chamber. The antenna is designed to interface with ground-signal-ground (GSG) micro-probes that have a probe pitch of 150 um to 250 um.

Analysis of Measurement Probe Spherical Higher Order Modes based on Equivalent Currents

Technical Publications
07/18/2016

Probe correction in Spherical Near Field (SNF) measurements is typically performed during the NF/FF transformation. This requirement leads to challenging probe designs, especially if the required bandwidth is wide. For this reason, in many practical cases, higher order spherical modes can be radiated.

Numerical Investigation of Cross Polar Reduction CATR Feed in Dual Linar Polarisation

Technical Publications
07/18/2016

The polarization purity of an antenna system is an important performance parameter, particularly in dual-polarized systems, where depolarization can prevent operating objectives from being achieved. Accurate polarisation testing requires a significantly higher polarisation purity of the test system than of the test object.

Evaluation of Antenna Coupling based on Measurements and Numerical Simulations

Technical Publications
07/18/2016

Integration of antenna measurements in numerical simulations, based on the equivalent current technique, has been validated in previous activities. A link, enabling the export of an accurate numerical model, derived from the measured antenna pattern, to a number of commercial Computational Electromagnetic (CEM) solvers has been created and validated.

Measured Antenna Models for Numerical Simulations of Antenna Placement Scenarios

Technical Publications
07/18/2016

 Accurate numerical models of a given antenna can be derived from measurements using the inverse source technique. Using this technique, measured antenna patterns can currently be imported and used as numerical sources in a number of commercial Computational Electromagnetic (CEM) solvers.

Insight- Using Measured Sources in Installed Performance Analysis

Technical Publications
05/20/2016

Electromagnetic simulation allows engineers to investigate the performance of antennas in a wide range of different environments which may be inaccessible or infeasible to measure. However, it is often the case that a suitable model of the antenna is not available for the simulation, especially for off-the-shelf antennas with geometries that are protected by intellectual property.

Pages