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Dual-Polarized Probe with Full Octave Bandwidth and Minimum Scattering for Planar Near Field Measurements

Technical Publications
12/14/2017

 Dual-polarized probes with wide-bandwidth operational capabilities are highly desirable for time-efficient Planar Near-Field (PNF) measurements [1]-[3]. However, sometimes the performance tradeoffs necessary to achieve the desired operating bandwidth make such probes impractical for many applications.

Thermal Testing of Small Antennas in Multi-Probe Spherical Near-Field Systems

Technical Publications
12/14/2017

Temperature changes cause thermal expansion of antenna materials and will have an important impact on antenna performances. In some applications, it is sufficient to calculate the antenna deformation by mechanical analysis and determine the RF impact by EM analysis tools.

High Performance Dual Polarized Near-Field Probe at V-Band Provides Increased Performances for Millimeter Wave Spherical Near-Field Measurements

Technical Publications
12/14/2017

V-band (50-75GHz) applications such as 5G and myriad others are the catalyst for high performance near-field antenna measurement systems. For Spherical Near-Field (SNF), the traditional approaches at millimeter wave frequencies collect two full spheres of data in the near-field where each sphere samples one of two linear and orthogonal fields of the antenna under test (AUT).

Truncation Error Mitigation in Free-Space Automotive Partial Spherical Near Field Measurements

Technical Publications
12/14/2017

Antennas installed in modern cars are often highly integrated. In such cases, the entire vehicle is contributing to the radiated field, in particular at lower frequencies such as VHF. The complete characterization of the full vehicle is thus typically required.

Application of the Translated-SWE Algorithm for the Characterization of Antennas Installed on Cars Using a Minimum Number of Samples

Technical Publications
12/14/2017

Automotive antenna measurements are increasingly demanding. Modern cars are equipped with a large number of integrated antennas, spanning a wide frequency range for a large number of applications. Integrated antennas are strongly coupled with the structure, final testing are thus performed on the vehicle to accurately determine the performance.

Validation of Measured Source Antenna Representation in the Numerical Simulation of a GNSS Antenna on Sentinel Satellite

Technical Publications
12/14/2017

 The measured source or Huygens box antenna representation has become an increasing popular solution to create accurate computational models of measured source antennas for the numerical analysis of antenna placement on complex platforms such as satellites.

Measurements of Low Gain VHF Antennas in Spherical Multi-Probe NF System

Technical Publications
12/14/2017

 The accurate characterization of low-gain antennas at VHF frequencies is challenging. Such antennas can be tested outdoors for convenience or in very large and thus expensive indoor Far-Field (FF) ranges. Indoor Near-Field (NF) systems are often considered a better cost compromise for such measurements, mainly due to the relaxed requirements on chamber size.

A Novel and Innovative Near Field System for Testing Radomes of Commercial Aircrafts

Technical Publications
12/14/2017

Current techniques for testing of aircraft radomes are time consuming, not as precise as desired, and requires dedicated far field test range, compact test range, or anechoic chamber, or other specific systems for measuring one or other of the parameters.

International Facility Comparison Campaign at L/C Band Frequencies

Technical Publications
12/14/2017

Comparison activities in which a number of measurement facilities compare their measurements of the same antenna in a standard configuration have become important for documentation and validation of laboratory expertise and competence. It is also mandatory to have regular participation in such activities to obtain and maintain accreditations like ISO 17025.

Over the Air Calibration of Massive MIMO TDD Arrays for 5G Applications

Technical Publications
07/31/2017

This paper addresses the problem of how to accurately calibrate Massive MIMO systems using time-division duplexing (TDD). In practical MIMO array implementations the transmission and reception path are different and hence a calibration mechanism, linking optimum receive array coefficients to optimum transmit coefficients is needed.

Chip Reference Antennas: Improving Millimeter- Wave On-Chip Antenna Measurements

Technical Publications
07/31/2017

The adoption of millimeter wave phased arrays for a variety of applications has led to an increased need for on-chip antenna measurements. The antenna elements are tested via micro-probe connections due to their tiny dimensions. For typical wireless applications (e.g. 5G/NR or IEEE 802.11.ad) these phased arrays, are expected to provide near omni-directional coverage.

Measurement and Simulation Comparison using Measured Source Antenna Representation of GNSS Antenna on Sentinel Satellite

Technical Publications
07/31/2017

Recent publications have reported on an innovative technique in which measured antennas are represented as numerical sources in the accurate computation of antennas in complex environments [1-5]. The measured antenna is accurately characterized as a Huygens box in a format compatible with different Computational Electro-Magnetic (CEM) solvers.

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.

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).

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. 

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