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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.

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. The physical and

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.

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.

使用校准或模拟探头进行全面和一阶探头校正的球形近场测量的比较研究

Technical Publications
03/29/2017

通常,在近场到远场变换期间,准确的球面近场天线测量补偿了探测图案。 根据探头模态内容的复杂性和所需的精度,可以应用不同的探头校正(PC)技术。 通常的做法是在考虑到整个探测光谱的情况下,区分仅补偿探针的μ| = 1个球面模式的一阶PC和全PC。 应用PC时要考虑的另一个关键因素是探针表征。 为了获得非常准确的结果,通常的做法是在专门的测量活动中校准探头,不幸的是,它常常是耗时且昂贵的。 或者,可以使用模拟探头性能来执行PC。 本文介绍了使用校准或模拟探针进行的全序列和一阶PC之间的比较调查。

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).

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.

测量和模拟之间的链接应用于天线散射和放置问题

Technical Publications
03/29/2017

近来在计算电磁(CEM)工具中使用测量数据作为近场源,即使在天线特性和几何形状未知而不能将其纳入全波模型[1- 4]的情况下,也可以在数值模拟中代表天线。 近场源由天线的等效电流代表组成,通过来自测量辐射图的逆源方法[5-9]制备。 这个将数值模拟和天线测量结合在一起的链接已经通过一个活动的验证,这其中涉及了MVG和不同的软件(SW)供应商[10-15]。 在本文的第一部分,验证的最新结果完成了[1-3]中描述的活动。 在本文的第二部分,测量和模拟之间的关联应用于更复杂和/或现实的问题,包括散射问题。

Microwave Vision:从射频安全到医学影像

Technical Publications
03/29/2017

本文概述了Microwave Vision公司(以前称为Satimo),与健康医学相关应用的商业活动范畴。 对现有产品在比吸收率(SAR)测量和射频安全方面进行了详细描述并对使用微波进行乳腺病理检测的新成像模式的发展进展给以简短的描述。

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.

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