scholarly journals Near-Field to Far-Field Transformation Techniques with Spiral Scannings: A Comprehensive Review

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Renato Cicchetti ◽  
Francesco D’Agostino ◽  
Flaminio Ferrara ◽  
Claudio Gennarelli ◽  
Rocco Guerriero ◽  
...  
Keyword(s):  
Communication Systems ◽  
Near Field ◽  
Theoretical Background ◽  
Wireless Communication Systems ◽  
Far Field ◽  
Unified Theory ◽  
Transformation Techniques ◽  
Positioning Systems ◽  
Rotational Surface ◽  
Spiral Scanning

An overview of the near-field-far-field (NF-FF) transformation techniques with innovative spiral scannings, useful to derive the radiation patterns of the antennas commonly employed in the modern wireless communication systems, is provided in this paper. The theoretical background and the development of a unified theory of the spiral scannings for quasi-spherical and nonspherical antennas are described, and an optimal sampling interpolation expansion to evaluate the probe response on a quite arbitrary rotational surface from a nonredundant number of its samples, collected along a proper spiral wrapping it, is presented. This unified theory can be applied to spirals wrapping the conventional scanning surfaces and makes it possible to accurately reconstruct the NF data required by the NF-FF transformation employing the corresponding classical scanning. A remarkable reduction of the measurement time is so achieved, due to the use of continuous and synchronized movements of the positioning systems and to the reduced number of needed NF measurements. Some numerical and experimental results relevant to the spherical spiral scanning case when dealing with quasi-planar and electrically long antennas are shown.

Experimental Testing on an Effective Technique to Reconstruct the Far- Field Pattern of a Long Antenna from Near-Field Measurements Acquired via Spherical Spiral Scan

2014 ◽  
Vol 8 (1) ◽  
pp. 1-9 ◽  
Author(s):  
F. D’Agostino ◽  
F. Ferrara ◽  
C. Gennarelli ◽  
R. Guerriero ◽  
M. Migliozzi
Keyword(s):  
Experimental Testing ◽  
Near Field ◽  
Field Measurements ◽  
Field Pattern ◽  
Far Field ◽  
Positioning Systems ◽  
Spiral Scanning ◽  
The University ◽  
Far Field Pattern ◽  
Spiral Scan

In this paper, the experimental validation of a fast and accurate near-field – far-field (NF–FF) transformation with spherical spiral scanning for elongated antennas is provided. Such a transformation relies on a nonredundant sampling representation of the voltage measured by the probe, obtained by using the unified theory of spiral scans for nonspherical antennas and adopting a cylinder ended in two half-spheres to model long antennas. It allows a remarkable reduction of the measurement time due to the use of continuous and synchronized movements of the positioning systems and to the reduced number of needed NF measurements. In fact, the NF data required by the classical spherical NF–FF transformation are efficiently and accurately recovered from those collected along the spiral, by using an optimal sampling interpolation expansion. Experimental results, obtained at the Antenna Characterization Lab of the University of Salerno and assessing the effectiveness of such a NF–FF transformation, are shown.

scholarly journals THE UNIFIED THEORY OF NEAR-FIELD-FAR-FIELD TRANSFORMATIONS WITH SPIRAL SCANNINGS FOR NONSPHERICAL ANTENNAS

2009 ◽  
Vol 14 ◽  
pp. 449-477 ◽  
Author(s):  
Francesco D'Agostino ◽  
Flaminio Ferrara ◽  
Claudio Gennarelli ◽  
Rocco Guerriero ◽  
Massimo Migliozzi
Keyword(s):  
Near Field ◽  
Far Field ◽  
Unified Theory

scholarly journals A Nonredundant Near-Field to Far-Field Transformation with Spherical Spiral Scanning for Nonspherical Antennas

2009 ◽  
Vol 3 (1) ◽  
pp. 1-8 ◽  
Author(s):  
F. D'Agostino ◽  
F. Ferrara ◽  
C. Gennarelli ◽  
R. Guerriero ◽  
M. Migliozzi ◽  
...  
Keyword(s):  
Near Field ◽  
Far Field ◽  
Spiral Scanning ◽  
Field Transformation

scholarly journals Recent Advances in Near-Field to Far-Field Transformation Techniques

2012 ◽  
Vol 2012 ◽  
pp. 1-3 ◽  
Author(s):  
Claudio Gennarelli ◽  
Amedeo Capozzoli ◽  
Lars J. Foged ◽  
Jeff Fordham ◽  
Daniël Janse van Rensburg
Keyword(s):  
Near Field ◽  
Far Field ◽  
Transformation Techniques ◽  
Recent Advances ◽  
Field Transformation

scholarly journals Stand for measuring the directional characteristics of antennas of satellite communication systems

2020 ◽  
Vol 4 (4) ◽  
pp. 201-208
Author(s):  
A. B. Gladyshev ◽  
D. D. Dmitriev ◽  
V. N. Ratushnyak ◽  
A. V. Zhgun ◽  
O. B. Gritsan
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Block Diagram ◽  
Near Field ◽  
The Arctic ◽  
Spiral Scanning ◽  
Measurement Results ◽  
Directional Characteristics ◽  
Promising Solution ◽  
Telecommunications Services

The development of network based on satellite communication systems is a promising solution for providing telecommunications services in the Arctic. Therefore, the task of developing and creating earth stations for advanced satellite communication systems that have characteristics significantly higher than their world counterparts is actual. Characteristics of such stations depend on antenna’s systems characteristics that determine the energy characteristics of the communication channel. The aim of this work is a stand developing for measuring directional characteristics of antennas of satellite communication systems based on the spherical scanner (TS8991). Spiral scanning is an alternative measurement method aimed at reducing measurement time with saving necessary accuracy. As a result of this work, the spiral scanning algorithm based on the near-field scanner Rohde & Schwarz TS8991 was implemented. Moreover, the stand for monitoring and configuring the parameters of satellite earth station antennas was built. Block diagram of this stand is presented in article. An antenna with 1,2 m diameter of reflector was tested on the developed stand. The measurement results showed deviations of the measured values from the calculated values, which related by design disadvantages of the antenna. The stand using time was 35 minutes for measurements and conversions to the far field, for an antenna with 1,2 m diameter of reflector.

scholarly journals Faulty antenna detection in a linear array using simulated annealing optimization

2020 ◽  
Vol 19 (3) ◽  
pp. 1340
Author(s):  
Navaamsini Boopalan ◽  
Agileswari K. Ramasamy ◽  
Farrukh Hafiz Nagi
Keyword(s):  
Simulated Annealing ◽  
Radiation Pattern ◽  
Antenna Arrays ◽  
Communication Systems ◽  
Linear Array ◽  
Near Field ◽  
Optimization Method ◽  
Random Permutation ◽  
Far Field ◽  
Planar Array

<span lang="EN-US">Sonar, radar and communication systems solely depend on antenna arrays for signal attainment. These arrays are capable of producing directional signals which can be steered in a certain direction. Faulty elements in an array will result in distorted radiation pattern with increased sidelobe levels.  Far-field faulty antenna detection is necessary due to the near field repairing at complex systems like spacecraft. This paper proposes simulated annealing (SA) optimizing method to find the faulty element’s location in a linear array. In this study, a Chebyshev array is presented with the SA optimization method to detect faulty element location with a random permutation of failure locations tested. This method can successfully detect faulty antenna in a linear array. Even though, this method is developed for linear array it can easily be adapted to a planar array.</span>

Near-field-far-field transformation with spherical spiral scanning

2003 ◽  
Vol 2 ◽  
pp. 263-266 ◽  
Author(s):  
O.M. Bucci ◽  
F. D'Agostino ◽  
C. Gennarelli ◽  
G. Riccio ◽  
C. Savarese
Keyword(s):  
Near Field ◽  
Far Field ◽  
Spiral Scanning ◽  
Field Transformation

Probe compensated far-field reconstruction by near-field planar spiral scanning

2002 ◽  
Vol 149 (2) ◽  
pp. 119-123 ◽  
Author(s):  
O.M. Bucci ◽  
F. D'Agostino ◽  
C. Gennarelli ◽  
C. Savarese ◽  
G. Riccio
Keyword(s):  
Near Field ◽  
Far Field ◽  
Field Reconstruction ◽  
Spiral Scanning

scholarly journals Application of Nonredundant Sampling Representations of Electromagnetic Fields to NF-FF Transformation Techniques

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Ovidio M. Bucci ◽  
Claudio Gennarelli
Keyword(s):  
Electromagnetic Fields ◽  
Experimental Results ◽  
Measurement Time ◽  
Optimal Sampling ◽  
Unified Theory ◽  
Transformation Techniques ◽  
Rotational Surface ◽  
Probe Response ◽  
Remarkable Reduction

An overview of the application of the band-limitation properties and nonredundant sampling representations of electromagnetic fields to NF-FF transformations is presented. The progresses achieved by applying them to data acquired on conventional NF scanning surfaces are discussed, outlining the remarkable reduction in the number of needed NF samples and measurement time. An optimal sampling interpolation expansion for reconstructing the probe response on a rotational scanning surface from a non-redundant number of its samples is also discussed. A unified theory of the NF-FF transformations with spiral scannings, which allow a remarkable reduction of the measurement time, is then reviewed by describing a sampling representation of the voltage on a quite arbitrary rotational surface from its nonredundant samples collected on a proper spiral wrapping it. Some numerical and experimental results assessing the effectiveness of the considered NF-FF transformations are shown too.

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