Methodology for a sub-millimeter near-field beam pattern measurement system

2014 ◽  
Author(s):  
Kristina K. Davis ◽  
Chris Groppi ◽  
Hamdi Mani ◽  
Caleb Wheeler ◽  
Chris Walker
Keyword(s):  
Measurement System ◽  
Near Field ◽  
Beam Pattern

Reconfigurable Near-Field Beam Pattern Measurement System From 0.03 to 1.6 THz

2016 ◽  
Vol 6 (2) ◽  
pp. 300-305 ◽  
Author(s):  
Alvaro Gonzalez ◽  
Yasunori Fujii ◽  
Takafumi Kojima ◽  
Shin'ichiro Asayama
Keyword(s):  
Measurement System ◽  
Near Field ◽  
Beam Pattern

scholarly journals Multi-Probe Measurement System Based on Single-Cut Transformation for Fast Testing of Linear Arrays

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1744
Author(s):  
Fernando Rodríguez Varela ◽  
Manuel José López Morales ◽  
Rubén Tena Sánchez ◽  
Alfonso Tomás Muriel Barrado ◽  
Elena de la Fuente González ◽  
...  
Keyword(s):  
Measurement System ◽  
Near Field ◽  
Linear Measurement ◽  
Complete Characterization ◽  
Linear Arrays ◽  
Full Characterization ◽  
X Band ◽  
Measurement Results ◽  
The Many ◽  
3D Information

This paper introduces a near-field measurement system concept for the fast testing of linear arrays suited for mass production scenarios where a high number of nominally identical antennas needs to be measured. The proposed system can compute the radiation pattern, directivity and gain on the array plane, as well as the array complex feeding coefficients in a matter of seconds. The concept is based on a multi-probe antenna array arranged in a line which measures the near field of the antenna under test in its array plane. This linear measurement is postprocessed with state-of-the-art single-cut transformation techniques. To compensate the lack of full 3D information, a previous complete characterization of a “Gold Antenna” is performed. This antenna is nominally identical to the many ones that will be measured with the proposed system. Therefore, the data extracted from this full characterization can be used to complement the postprocessing steps of the single-cut measurements. An X-band 16-probe demonstrator of the proposed system is implemented and introduced in this paper, explaining all the details of its architecture and operation steps. Finally, some measurement results are given to compare the developed demonstrator with traditional anechoic measurements, and show the potential capabilities of the proposed concept to perform fast and reliable measurements.

scholarly journals New Measurement System of Magnetic Near-Field With Multipolar Expansion Approach

2016 ◽  
Vol 52 (3) ◽  
pp. 1-4 ◽  
Author(s):  
A. Breard ◽  
F. Tavernier ◽  
Z. Li ◽  
L. Krahenbuhl
Keyword(s):  
Measurement System ◽  
Near Field ◽  
Multipolar Expansion

scholarly journals Method to Determine the Far-Field Beam Pattern of A Long Array From Subarray Beam Pattern Measurements

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1236
Author(s):  
Donghwan Jung ◽  
Jeasoo Kim
Keyword(s):  
Conventional Method ◽  
Field Condition ◽  
Near Field ◽  
Plane Waves ◽  
Measurement Data ◽  
Beam Pattern ◽  
Far Field ◽  
Water Tank ◽  
Discrete Line ◽  
Line Array

Beam pattern measurement is essential to verifying the performance of an array sonar. However, common problems in beam pattern measurement of arrays include constraints on achieving the far-field condition and reaching plane waves mainly due to limited measurement space as in acoustic water tank. For this purpose, the conventional method of measuring beam patterns in limited spaces, which transform near-field measurement data into far-field results, is used. However, the conventional method is time-consuming because of the dense spatial sampling. Hence, we devised a method to measure the beam pattern of a discrete line array in limited space based on the subarray method. In this method, a discrete line array with a measurement space that does not satisfy the far-field condition is divided into several subarrays, and the beam pattern of the line array can then be determined from the subarray measurements by the spatial convolution that is equivalent to the multiplication of beam pattern. The proposed method was verified through simulation and experimental measurement on a line array with 256 elements of 16 subarrays.

Beam pattern formation and on‐/off‐axis pressure in the near field through elastic structures

2000 ◽  
Vol 108 (5) ◽  
pp. 2637-2637
Author(s):  
Fernando García‐Osuna ◽  
Elmer L. Hixson ◽  
Augusto L. Podio
Keyword(s):  
Pattern Formation ◽  
Near Field ◽  
Beam Pattern ◽  
Elastic Structures

scholarly journals Dual-Probe Near-Field Phaseless Antenna Measurement System on Board a UAV

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4663 ◽  
Author(s):  
María García Fernández ◽  
Yuri Álvarez López ◽  
Fernando Las-Heras
Keyword(s):  
Measurement System ◽  
Phase Retrieval ◽  
Near Field ◽  
Field Measurements ◽  
Dual Band ◽  
Antenna Measurement ◽  
Antenna Performance ◽  
Simultaneous Acquisition ◽  
Recent Developments ◽  
The One

On-site antenna measurement has been recently attracting an increasing interest in order to assess the antenna performance in real operational environments. The complexity and cost of these kind of measurements have been significantly cut down due to recent developments in unmanned aerial vehicles’ (UAVs) hardware and antenna measurement post-processing techniques. In particular, the introduction of positioning and geo-referring subsystems capable of providing centimeter-level accuracy together with the use of phase retrieval techniques and near-field to far-field transformation algorithms, have enabled near field measurements using UAVs. This contribution presents an improved UAV-based on-site antenna measurement system. On the one hand, the simultaneous acquisition on two measurement surfaces has been introduced and calibrated properly, thus reducing geo-referring uncertainties and flight time. On the other hand, the positioning and geo-referring subsystem has been enhanced by means of a dual-band real time kinematics (RTK) unit. The system capabilities were validated by measuring an offset reflector antenna, and the results were compared with the measurements at the spherical range in the anechoic chamber and with the measurements collected with a previous version of the implemented system.

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