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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.

Insight- Analysis of Coupling Phenomena between Spacecraft Antennas based on Equivalent Current Technique

Technical Publications
05/19/2016

In this paper an advanced analysis regarding the interaction between antennas installed on a spacecraft is presented. In particular, data coming from a GNSS satellite near field measurement campaign have been considered and the MV-INSIGHT software has been used to perform the analysis.

Insight- Measured Antenna Representation of Flush Mounted

Technical Publications
05/19/2016

In this paper is demonstrated the accurate representative electromagnetic models of measured antennas based on the MVG software INSIGHT processing, implementing the inverse source technique. The measurement processing is based on the expansion of the measured field using equivalent currents.

Insight- Bringing Numerical Simulation and Antenna Measurements Together

Technical Publications
05/19/2016

This paper describes a new procedure allowing the use of measured antenna sources in commercially-available numerical computational environments. The procedure is fully general and can be used with common antennas in complex environments of arbitrary shape and complexity.

Insight- Measurements as Enhancement of Numerical Simulation for Challenging Antennas

Technical Publications
05/19/2016

In this paper, applications of measured sources in complex scenarios are reported using commercial CEM solvers. Both free-standing and flush mounted antennas are investigated. The accuracy of the method is investigated by comparison with measurements and/or full-wave simulation of the full structure.

Electrically thin VHF Array Elements for Satellite Applications Using Artificial Magnetic Material

Technical Publications
01/06/2016

This  paper  describes  the design,  manufacturing  and  testing  of  a  dual  polarized  array element  considering  application  in  a  low  orbit  Automatic Identification System (AIS) mission.

Antenna Measurement Systems Using Multi-Probe Technlogy

Technical Publications
01/06/2016

This  paper  reviews  recent  developments  in  multi-probe antenna  measurements  technology  and  show  new  application examples. In particular, the results of a challenging measurement of  a  VHF  low-directive  antenna  performed  in  a  hemispherical multi-probe system are reported.

Multi-Probe Spherical Near-Field Antenna Test System for an Aircraft Rotodome

Technical Publications
12/16/2015
A multi-probe array (MPA) spherical near-field antenna measurement system, comprised of OTS equipment, has been developed for testing UHF antennas mounted of an aircraft rotodome. The spherical probe radius is 5 meters, which accommodates a 24 ft. diameter rotodome.

Near-Field (NF) Measurements and Statistical Analysis of Random Electromagnetic (EM) Fields of Antennas and Other Emitters to Predict Far-Field (FF) Pattern Statistics

Technical Publications
12/16/2015
This paper discusses the application of modern NF measurements and statistical analysis techniques to efficiently characterize the FF radiation pattern statistics of antennas and other EM emitters whose radiated EM fields vary erratically in a seemingly random manner.

Time and Spatial Filtering for Echo Reduction in Antenna Measurements

Technical Publications
12/16/2015
During the last years, new algorithms, based on time filtering, spatial or modal filtering, have been designed for echo reduction techniques applied to antenna measurements. These algorithms have been used for different applications where the effect of the echoes is important, as far field system, VHF or UHF applications, automotive systems, small antennas, etc.

Using Measured Fields as Field Sources in Computational EMC

Technical Publications
12/16/2015
The source reconstruction or equivalent source method allows to represent each type of radiating device as nearfield equivalent source in form of equivalent electric and magnetic currents (EQC). The equivalent currents can be evaluated from measured data (near-field and far-field) through a post-processing step involving the solution of an integral equation.

Reduction of the Cross Polarization Component in the Quiet Zone of a Single Reflector CATR

Technical Publications
12/16/2015

A novel conjugate matched feed for standard single reflector Compact Antenna Test Ranges (CATR) has recently been presented.

Mitigating Effects of Interference in On-Chip Antenna Measurements

Technical Publications
08/06/2015
Coupling a Chip Antenna to an Antenna Measurement System is typically achieved using a coplanar micro-probe. This micro-probe is attached to a probe positioner that is used to maneuver the micro-probe into position and land it on the chip. Through this process, the chip antenna is supported by a dielectric chuck.

Experimental Near-Field Method for Validating Simulation Antenna Models

Technical Publications
08/06/2015

—Experimental validation of numerical antenna models are performed to verify the model accuracy before their use in larger scale simulations. Model validation is usually performed by comparing to measurements of the antenna or device under test.

Using Spherical Near Field Measurements in Computational EMC

Technical Publications
08/06/2015

Inverse source or equivalent current/source method (EQC) provides an accurate near-field representation of any radiating device in terms of equivalent electric and magnetic currents [1-4].

2x2 MIMO Downlink OTA Measurement based on CTIA Guidelines

Technical Publications
08/06/2015

Wireless industry through 3G Partnership Project (3GPP), and CTIA The Wireless Association has been studying, validating, and standardizing the 2x2 MIMO Downlink OTA tests since 2009. Especially, CTIA has already provided the guidelines for the MIMO OTA tests in both the Spatial Multiplexing, and Transmit Diversity scenarios [1].

Accurate Measurement of Transmit and Receive Performance of AAS Antennas in a Multi-Probe Spherical NF System

Technical Publications
08/06/2015

The Active Antenna System (AAS) is receiving an increased attention for the upcoming 5G cellular networks. The actual measurement AAS antennas require new thinking in active antenna measurement.

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