An improved holographic technique for medium-gain antenna near field measurements

Leach, Mark; Smith, D.; Skobelev, Sergei P.; Elsdon, Michael

doi:10.1049/ic.2007.1091

Cited by 2 publications

(10 citation statements)

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“…[1], the maximum spatial bandwidth 3 of a radiated field in a planar acquisition is W k ¼ k 0 . On the other hand, since the autocorrelation terms are the FT of a squared field, their bandwidth doubles the bandwidth of the original field [21,28,38] and, thus, the no overlapping condition is given by…”

Section: Overlapping Control: Off-axis Reference and Sampling Requirementioning

confidence: 99%

“…Furthermore, overlapping degree varies depending on the type of reference antenna and the measured AUT. Directive antennas have narrower spectra [28] and the part of the spectrum associated to the squared signals often decays faster as it is computed for the convolution of two signals of bandwidth k 0 [5].…”

Section: Overlapping Control: Off-axis Reference and Sampling Requirementioning

confidence: 99%

“…[21,38] and successively adapted for synthesized reference fields (see Section 2.3) in Refs. [27][28][29]. The technique consists in the removal of the autocorrelation terms of the hologram prior to the filtering process and can be implemented by means of two different approaches.…”

Section: Modified Hologrammentioning

confidence: 99%

“…First of them requires an extra measurement to characterize the amplitude of E aut (the amplitude of E ref is a priori known) [21,23,29,30,39]. Second approach, commonly known as opposite-phase holography [28,40], introduces a hybrid-T component in the setup, which provides simultaneously the complete hologram in the sum port and the autocorrelation terms in the difference port. Another approach, used in imaging applications, is to increase the reference level several times above the level of the AUT's field in order to reduce the autocorrelation terms of the hologram [41,42].…”

Section: Modified Hologrammentioning

confidence: 99%

“…During the last years, great efforts have been made to improve aspects such as sampling [22] and overlapping reduction [27] or reference signal calibration [28,29]. The rest of the chapter is divided as follows: Section 2 contains an introduction to conventional off-axis holography techniques applied to antenna metrology.…”

Section: Introductionmentioning

confidence: 99%

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Indirect Off-Axis Holography for Antenna Metrology

Arboleya

Laviada

Ala‐Laurinaho³

et al. 2017

Holographic Materials and Optical Systems

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Phase acquisition in antenna measurement, especially at millimeter-and submillimeterwave frequencies, is an expensive and challenging task. The need of a steady phase reference demands not only a very stable source but unvarying temperature conditions and strong positioning accuracy requirements. Indirect off-axis holography is an interferometric technique that allows for characterization of an unknown field by means of a simple filtering process of the hologram or intensity interference pattern in the spectral domain, provided that the reference field, employed to interfere with the unknown field, is known in amplitude and phase. This technique can be used to avoid the effect of the errors related to the phase acquisition and to further develop new efficient and robust techniques capable of phase retrieval from amplitude-only acquisitions allowing for cost and complexity reduction of the measurement setup. A short review of the state-of-theart in antenna metrology is presented in this chapter, as well as a description of conventional indirect off-axis techniques applied to this field. Last sections are devoted to the description of novel measurement techniques developed by the authors in order to overcome the main limitations of the conventional methods.

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Section: Overlapping Control: Off-axis Reference and Sampling Requirementioning

confidence: 99%

Section: Overlapping Control: Off-axis Reference and Sampling Requirementioning

confidence: 99%

Section: Modified Hologrammentioning

confidence: 99%

Section: Modified Hologrammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Indirect Off-Axis Holography for Antenna Metrology

Arboleya

Laviada

Ala‐Laurinaho³

et al. 2017

Holographic Materials and Optical Systems

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Use of Software Defined Radio Receivers for Antenna Measurements

Sanchez

Castañer

Foged³

2019

2019 PhotonIcs &Amp; Electromagnetics Research Symposium - Spring (PIERS-Spring)

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This paper presents a time domain antenna measurement technique that aims to measure antennas in referenceless scenarios. The technique resolves measurement challenges derived from antennas where the reference signal is not accessible, for intance in EMC or active antennas. The algorithm implemented in this work is based on the the Fast Fourier Transform of the time domain signal to estimate the power spectrum and the relative phase between measurement points. In order to do that a reference antenna is used to retrieve the phase, providing a full characterization in amplitude and phase of the electric field and allowing source reconstruction. The results demonstrate the potential of this technique for new antenna measurement systems and reveal some of the limitations of the technique to be optimized, like the undesired reflections due to the interactions between the probe and the reference antenna.

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An improved holographic technique for medium-gain antenna near field measurements

Cited by 2 publications

References 0 publications

Indirect Off-Axis Holography for Antenna Metrology

Indirect Off-Axis Holography for Antenna Metrology

Use of Software Defined Radio Receivers for Antenna Measurements

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