Horsham, United States
Horsham, United States

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McKinzie W.E.,WEMTEC , Inc. | Iversen P.,Orbit FR Inc. | Szpindor E.,Orbit FR Inc. | Smith M.A.,DuPont Company | Thrasher B.A.,DuPont Company
AMTA 2016 Proceedings | Year: 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. This low temperature cofired ceramic (LTCC) chip antenna is fabricated using DuPont's 9K7 GreenTape™ material system with gold conductors. Features include a wafer-probe transition, a shielded stripline corporate feed network, aperture coupled patch elements, and an integrated Sievenpiper electromagnetic bandgap (EBG) structure for surface wave mode suppression. The use of the EBG structure enables main beam gain enhancement and side lobe level suppression. This 2×2 antenna array is directive such that it offers a nominal gain of 12 dBi at broadside over 58-62 GHz with an antenna efficiency of at least 60%. The entire antenna package has a nominal size of only 10.9 mm × 12.2 mm × 0.71 mm. Since this antenna package material is hermetic, it has stable performance under varying humidity and temperature which is highly desirable as a reference antenna. © 2016 AMTA.

Campbell D.,EM Software and Systems Inc. | Gampala G.,EM Software and Systems Inc. | Reddy C.J.,EM Software and Systems Inc. | Winebrand M.,ORBIT FR Inc. | Aubin J.,ORBIT FR Inc.
Applied Computational Electromagnetics Society Journal | Year: 2013

Advances in computational resources facilitate anechoic chamber modeling and analysis at VHF/UHF frequencies using full-wave solvers available in commercial software such as FEKO. The measurement community has a substantial and increasing interest in utilizing computational electromagnetic (CEM) tools to minimize the financial and real estate resources required to design and construct a custom anechoic chamber without sacrificing performance. A full-wave simulation analysis such as the finite element method (FEM) provides a more accurate solution than the approximations inherent to asymptotic ray-tracing techniques such as physical optics (PO), which have traditionally been exploited to overcome computational resource limitations. An anechoic chamber is simulated with a rectangular down-range cross-section (in contrast with the traditional square cross-section) to utilize the software's capability to assess polarization performance. The absorber layout within the anechoic chamber can be optimized using FEKO for minimal reflections and an acceptable axial ratio in the quiet zone. Numerical results of quiet zone disturbances and axial ratios are included for both low- and medium-gain source antennas over a broad frequency range. © 2013 ACES.

Foged L.J.,Microwave Vision Italy MVI | Scialacqua L.,Microwave Vision Italy MVI | Mioc F.,Microwave Vision Italy MVI | Saccardi F.,Microwave Vision Italy MVI | And 5 more authors.
IEEE Antennas and Propagation Magazine | Year: 2013

This paper presents a comparative investigation of two versatile error-mitigation techniques, applicable to general antenna near-field measurement scenarios with echo signals of unknown origin. Both techniques are based on spatial filtering of the measured field, taking advantage of a priori knowledge of the antenna's size. The first approach takes advantage of the spatial-filtering properties of the spherical-wave expansion of the measured field. The second approach is based on the reconstruction of equivalent currents, and implements the spatial filtering as a direct consequence of the selected size and shape of the reconstruction surface. The investigation was performed using measured data on two different horns in both planar and spherical near-field scanning geometries. The presence and levels of echo pollution in the measurements were controlled by introducing known scattering objects in the anechoic chambers, and comparing with reference situations without disturbance. © 1990-2011 IEEE.

Foged L.J.,SATIMO | Scialacqua L.,SATIMO | Saccardi F.,SATIMO | Mioc F.,SATIMO | And 5 more authors.
2013 7th European Conference on Antennas and Propagation, EuCAP 2013 | Year: 2013

This paper reports the findings of a comparative investigation of two versatile echo suppression techniques applicable to general antenna near field measurement scenarios with echoes of unknown origin. Both techniques are based on spatial filtering of the measured field taking advantage of the apriori knowledge of the antenna size and can be applied to near field measurements in any canonical scan configuration. The first technique takes advantages of the spatial filtering properties of the spherical waves expansion of the measured field. The second method is based on the reconstruction of equivalent currents and implements the spatial filtering as a direct consequence of the selected size and shape of the reconstruction surface. The benefit of using redundant data in both techniques as a mean to achieve further echo reduction in spherical near field scan geometry is examined with particular attention. The investigation has been accomplished with measured data on a SATIMO wideband horn using different sampling of the full sphere. © 2013 EurAAP.

Soerens R.,ORBIT FR Inc. | Aubin J.,ORBIT FR Inc. | Winebrand M.,ORBIT FR Inc. | Foged L.J.,SATIMO | Miller J.J.,Penn State Applied Research Laboratory
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2011

This paper describes joint efforts undertaken by Penn State University Applied Research Laboratory, the National Institute of Standards, and the Microwave Vision Group, which includes ORBIT/FR Inc. and Satimo. The purpose of this research was to characterize a selected certification method for the performance of the test zone in a large anechoic chamber. The Applied Research Laboratory's chamber in Warminster, PA was selected for this research. © 2011 IEEE.

Burgos S.,ORBIT FR Europe GmbH | Iversen P.O.,ORBIT FR Inc. | Andersson T.,ORBIT FR Europe GmbH | Wagner U.,ORBIT FR Europe GmbH | And 7 more authors.
8th European Conference on Antennas and Propagation, EuCAP 2014 | Year: 2014

This paper deals with the upgrade of the ESTEC Compact Payload Test Range (CPTR) [1] to ensure that its capability in terms of measurement accuracy and frequency domain is adequate for complementing the ESTEC test centre facilities with state of the art antenna testing as requested by space projects. A near-field scanner has been incorporated in the existing ESA CPTR to establish a Hybrid Test Range in the frequency range from 400 MHz to 50 GHz. The main goals of this RF system upgrade are to increase the operational frequency range, to easy exchange the DUT transmit and receive modes and to improve the dynamic range. The system features are presented in this paper. © 2014 European Association on Antennas and Propagation.

Foged L.J.,Microwave Vision Italy MVI | Saccardi F.,Microwave Vision Italy MVI | Mioc F.,Microwave Vision Italy MVI | Iversen P.O.,Orbit FR Inc.
2016 10th European Conference on Antennas and Propagation, EuCAP 2016 | Year: 2016

Spherical Near Field (NF) measurements are widely used in order to accurately characterize the radiating performance of antennas. The main drawback of this type of measurement is the acquisition time that, depending on the electrical size of the Antenna Under Test (AUT), could be very long. This is due to the fact that, in order to correctly evaluate the Far Field (FF) with the NF/FF transformation [1]-[3], the NF has to be sampled over the full sphere with a sampling density that increases with the dimension of the so called AUT minimum sphere [3]. In many spherical NF measurement scenario, it is not possible to locate the AUT in the origin of the measurement sphere resulting in a larger minimum sphere, which implies a denser sampling and a longer acquisition time. An innovative NF/FF technique that allows to drastically reduce the samples density in offset spherical NF measurement is presented in this paper. © 2016 European Association of Antennas and Propagation.

Aubin J.,ORBIT FR Inc. | Winebrand M.,ORBIT FR Inc. | Vinogradov V.,ORBIT FR Inc.
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2011

Anechoic chambers utilized for far-field antenna measurements at VHF/UHF frequencies typically comprise rectangular and tapered designs. The primary purpose of conventional far-field chambers is to illuminate a test zone surrounding the Antenna Under Test (AUT) with an electric field that is as uniform as possible, while multiple reflections from the side wall absorber assemblies are kept to a minimum. The Two - Level GTD method has been offered in [1,2] to reduce the reflectivity and improve overall performance for anechoic chambers operating at frequencies 1 GHz, where the characteristic dimensions of the side-walls are normally more than 30. It includes the shaping of the side walls of the anechoic chamber along with application of a fish - bone absorber layout [3] - both are designed based on GTD principles. The cross section dimensions of far field chambers at VHF/UHF frequencies can be electrically small, often as little as 3. In this paper the Two - Level GTD method is applied to improve the reflectivity in an anechoic chamber with external dimensions as small as 18(H) 18(W) 33(L) operating from as low a frequency as 100 MHz. The simulations are performed first to compare the reflectivity results achieved with a Two-Level GTD with the reflectivity achieved in a conventional anechoic chamber. The anechoic chamber has been built and tested. The reflectivity results are obtained thru test zone probing and confirm the reflectivity improvement and overall outstanding performance of the chamber. © 2011 IEEE.

Iversen P.,ORBIT FR Inc. | Boumans M.,ORBIT FR Europe GmbH | Burgos S.,ORBIT FR Europe GmbH
Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012 | Year: 2012

The overall physical dimensions of an antenna measurement facility depend on the largest expected test antenna, typically in the lower frequency band. On the other hand, dimensional tolerances are driven by the high frequencies, where antennas tend to be small. Thus, combining such requirements leads to choose a large and mechanically very accurate test facility in order to meet the electrical and mechanical requirements, which normally is a costly solution. Another approach could be to consider multiple test facilities, each dedicated to a certain category of antennas. For instance, the mini compact ranges proposed by ORBIT/FR offer a complete, self-contained compact range test system targeting smaller aperture antennas. The system's small size, portability and characteristics make it well-suited for automotive radar. In this paper, a mini compact range for automotive radars is proposed as an alternative to the far-field or near-field measurement system. The compact ranges offer higher measurement speed, no need for building a separate anechoic chamber, easy operation, mobility and ruggedness. © 2012 IEEE.

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