Reconstructed Wavefronts and Communication Theory*

Leith, Emmett N.; Upatnieks, Juris

doi:10.1364/josa.52.001123

Cited by 1,494 publications

(518 citation statements)

References 2 publications

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“…In comparison, post-detector noise power density, for example from thermal noise, is proportional to the variance σ 2 2 of the equivalent instantaneous noise voltage source.…”

Section: Noise Modelmentioning

confidence: 99%

“…Figure 3. Sensitivity of the near-field solution to independent calibration errors in one of the two phase-shifter constants, τ 1,2 . Magnitude variations in τ 1,2 are ±0.1 dB.…”

Section: Verification With a 372 Ghz Antenna Feko Simulationmentioning

confidence: 99%

“…Off-axis near-field holography requiring the entire hologram pattern was experimentally demonstrated at 94 GHz in [1]. The method was adapted from the well known Fourier transform version of holography by Leith & Upatnieks [2], but requires relatively large scan distances. Additionally, sampling requirements are greater than those of conventional near-field methods.…”

Section: Introductionmentioning

confidence: 99%

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Phase Shifting Holography for THZ Near-Field/Far-Field Prediction

Junkin¹

2014

PIER Letters

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Abstract-With a view to extending techniques for THz antenna near-field/far-field prediction, this communication derives general analytic expressions for calibrated phase shifting holography (PSH) and introduces a new 120 • three-step PSH method that avoids switching off the reference field and has symmetrical performance over the entire complex plane, providing spurious free far-field prediction. Numerical tests with simulated near-field patterns at 372 GHz confirm the convenience of the method and give an indication of the precision required for the phase shifts.

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“…In comparison, post-detector noise power density, for example from thermal noise, is proportional to the variance σ 2 2 of the equivalent instantaneous noise voltage source.…”

Section: Noise Modelmentioning

confidence: 99%

“…Figure 3. Sensitivity of the near-field solution to independent calibration errors in one of the two phase-shifter constants, τ 1,2 . Magnitude variations in τ 1,2 are ±0.1 dB.…”

Section: Verification With a 372 Ghz Antenna Feko Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase Shifting Holography for THZ Near-Field/Far-Field Prediction

Junkin¹

2014

PIER Letters

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“…This incomplete measurement yields to a virtual image (order = 1) of the object that is superposed [4] with a ghost twin image (order = −1) and with the remaining part of the reference field (order = 0). A solution to this problem (see Fig.1.1) is to tilt the reference beam in respect to the signal beam [5] in order to separate physically the three images and to select the wanted image. This off-axis method reduces the useful angular field of view and restricts measurement to the far field region where the 3 images are spatially separated.…”

Section: Heterodyne Holographymentioning

confidence: 99%

Imagery of Diffusing Media by Heterodyne Holography

Gross

Clerc

Collot³

2001

Waves and Imaging Through Complex Media

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“…Indirect off-axis holography, also known as Leith-Upatnieks holography [24], is an interferometric technique adapted from optical holography to amplitude-only antenna metrology in the early 1970s [25,26]. 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].…”

Section: Introductionmentioning

confidence: 99%

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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Reconstructed Wavefronts and Communication Theory*

Cited by 1,494 publications

References 2 publications

Phase Shifting Holography for THZ Near-Field/Far-Field Prediction

Phase Shifting Holography for THZ Near-Field/Far-Field Prediction

Imagery of Diffusing Media by Heterodyne Holography

Indirect Off-Axis Holography for Antenna Metrology

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