Pilot signal-based real-time measurement correction of phase errors caused by microwave cable flexing in planar near-field tests

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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“…Finally, Figure 14(c) depicts the error computed as in Eq. (16). Mean value of the error in the complete frequency band is 2:24%.…”

Section: Numerical Validation For the Characterization Of A Horn Antementioning

confidence: 90%

“…Nevertheless, phase acquisition, particularly at mm-and submm-wave bands, is a challenging task that requires sophisticated and expensive equipment due to the high thermal stability requirements and the effect of the errors, mostly resulting from thermal drift and cable flexing [1,[13][14][15][16].…”

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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“…At high frequencies, even a small relative change in the dimensions of the cable may cause a huge phase change to the transmitted signal, because the cable can be electrically very long. Although the error compensation techniques have been introduced [4], the measurement errors due to bending cables may be significant especially in the planar near-field scanning at high frequencies. Another limitation with far-field and compact ranges is that they require a relatively large space.…”

Section: Introductionmentioning

confidence: 99%

Antenna Pattern Retrieval From Reflection Coefficient Measurements With Reflective Loads

Du¹,

Viikari²,

Ala‐Laurinaho³

et al. 2014

PIER

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Abstract-This paper presents a new method for antenna pattern retrieval from reflection coefficient measurements. A reflective load with known reflective properties is placed close to the aperture of the antenna under test. The reflection coefficient of the antenna is measured at the antenna feed with multiple different reflective loads. The antenna pattern is then solved from the measurements with an inversion method. This paper derives and verifies the analytical foundations needed to implement the method, and demonstrates the method both by simulations and experiments for a pyramidal horn antenna at 30 GHz.

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“…Traditionally, focus has been set either over the cables' electrical performance or in the instrumentation drift [4,5], with diverse compensation scheme implementations. This paper contributes the literature performing analysis and correction in the radiating stage of the CATR, through its collimation optics.…”

Section: Introductionmentioning

confidence: 99%

Influence of atmospheric conditions on mmWave CATR facilities: Formulation and compensation scheme

Muñoz‐Acevedo

Rolo

Silva

et al. 2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

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Abstract-The performance of a CATR relies on the planarity of the synthesized test wave, which is generated within a bounded volume for which specifications are drawn. Millimetre-wave facilities deal with the classical limitations of this frequency band, among which two become critical in our analysis: time-extensive acquisition campaigns and impact of environmental variables. Both features become more evident when increasing the frequency of operation. The variation in atmospheric variables, such as humidity, temperature and pressure has an influence over the performance of all the elements of the facility. The instrumentation behavior is influenced both by the warming up process, and the ambience conditions that surround the equipment. On the changes of the atmosphere itself, they affect the electromagnetic wave propagation, given the physical link between the conditions of the atmosphere and its electric properties as an electromagnetic waves propagation medium.

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Pilot signal-based real-time measurement correction of phase errors caused by microwave cable flexing in planar near-field tests

Cited by 34 publications

References 6 publications

Indirect Off-Axis Holography for Antenna Metrology

Indirect Off-Axis Holography for Antenna Metrology

Antenna Pattern Retrieval From Reflection Coefficient Measurements With Reflective Loads

Influence of atmospheric conditions on mmWave CATR facilities: Formulation and compensation scheme

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