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.
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.
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.
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.
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.
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.
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.
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.
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.
Accurate electromagnetic models of measured antennas are available from the expansion of the measured field using equivalent currents. The constructed model is importable in commercial Computational Electromagnetic (CEM) solvers in the form of a Huygens Box.
In antenna measurement, well-established procedures are consolidated to determine the associated measurement, uncertainty for a given antenna and measurements scenario. Similar criteria for establishing uncertainties in numerical modeling of the same antenna are still to be established.
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 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.
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 .
Performing on-chip antenna measurements at 60 GHz presents new challenges and magnifies legacy challenges. Testing on-chip antennas uses a micro-probe to interface the RF measurement system to the antenna under test (AUT). The small features of the antenna, the micro-probe, and the wavelength are among these challenges.