Cylindrical near‐to‐far‐field transformation system for radar antennas: Design, validation, and application

Burgos, S.; Alonso-Martín, Fernándo; Silva, Manuel; Besada, Juan A.

doi:10.1002/mop.23709

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…In [Burgos, 2008], the description of the cylindrical near-to-far-field transformation, considering probe correction, its validation and its application is explained. By using Reciprocity Theorem, the electric field can be expressed as a combination of the four weighting functions (for AUT and probe), obtaining the expression proposed by Leach and Paris in [Leach & Paris, 1973]:…”

Section: Near-to-far-field Transformation Algorithm and Its Validationmentioning

confidence: 99%

Error Analysis and Simulator in Cylindrical Near-Field Antenna Measurement Systems

Sara¹,

Silva²,

Fernando³

et al. 2010

Advances in Measurement Systems

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Large antennas need special measurement systems because of their considerable dimensions. Typically, cylindrical near-field systems are appropriate measurement systems for omnidirectional antennas due to the characteristics of their radiation patterns. Furthermore, these systems are also appropriate for sizeable RADAR antennas, since they can be measured on their azimuthal positioner and the probe can be easily translated through a vertical linear slide. Thus, mechanical aspects of measurement systems are rather important since errors in the mechanical set-up can directly affect far-field radiation patterns. This chapter presents an error estimation tool to analyze the most important errors for large L-band RADAR antennas in an outdoor cylindrical acquisition system and the effect of these errors in the calculated far-field radiation pattern. This analysis can be very convenient to evaluate the error budget of the Antenna Under Test (AUT). The simulator computes the far-field with an array of vertical dipoles over a ground plane and compares an ideal infinite far-field with the electric field obtained using the cylindrical near-to-far-field (NF-FF) transformation algorithm. The influence of the inaccuracies on the final results is evaluated by introducing random and systematic sources of errors and then, analyzing the variations produced in the principal far-field patterns, antenna parameters and in the side lobe levels (SLL). Finally, this simulator can be employed to analyze the errors for L-band RADAR antennas. One of the objectives of this investigation is thus to analyse how mechanical and electrical inaccuracies could affect the results of a cylindrical antenna measurement system, in order to minimize them as much as possible. This is highly important not only to meet the specifications, but also to reach high accurate results. There are several error sources studies for near-field patterns: the most complete are the ones developed by Joy and Newell in [Joy,

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Section: Near-to-far-field Transformation Algorithm and Its Validationmentioning

confidence: 99%

Error Analysis and Simulator in Cylindrical Near-Field Antenna Measurement Systems

Sara¹,

Silva²,

Fernando³

et al. 2010

Advances in Measurement Systems

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“…Using these data and accordingly with Eq. , far‐field distance should be 36 m. The latter is a limitation when measurement is made in an anechoic chamber, under these conditions is necessary to transform near‐field measurement into far‐field calculations . Thus, we propose a method for near‐field to far‐field transformation by using Pocklington equation .…”

Section: Introductionmentioning

confidence: 99%

A new proposal to convertnear-field into far-field for parabolic reflectors

Pedroza

Enciso-Aguilar

Peña-Ruiz

et al. 2016

Microw. Opt. Technol. Lett.

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A modeling of a 1.5‐m diameter parabolic reflector using the discrete Pocklington equation working at a frequency of 2.45 GHz has been presented; the proposal allows to obtain far‐field radiation pattern from the reflected field close to the surface plate which has been first modeled in CST MWS and then it was converted into a current vector using the discrete Pocklington equation. Finally, the far‐field pattern using antennas array theory was obtained. To validate the results, they compared them with the measurements of a real parabolic reflector. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1595–1599, 2016

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“…In [59], the description of the cylindrical near-to-far-field transformation, considering probe correction applied in this study, its validation and its application is explained. By using the Reciprocity Theorem, the electric field can be expressed as a combination of the four weighting functions (for AUT and probe), obtaining the expression proposed by Leach in [58]: The model developed for this application introduces the probe compensation method proposed by Hansen in [55], and usually applied to the spherical near-to-far-field transformation algorithms.…”

Section: 3-near-to-far-field Transformation Algorithmmentioning

confidence: 99%

“…With this change, the far-field in the final coordinate system could be achieved without needing an interpolation of the radiation pattern results. The previous tool has been validated using both simulations and measurements [59], using as simulated AUT, i.e. the AUT employed for the system validation, an array of 28x16 λ/2 dipoles vertically displaced over a ground plane at a distance equal to λ/4.…”

Section: 3-near-to-far-field Transformation Algorithmmentioning

confidence: 99%

Contribution to the uncertainty evaluation in the measurement of the main antenna parameters = Contribución a la evaluación de la incertidumbre en la medida de los principales parámetros de antena

Martínez¹

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Je voudrais remercier également mes amis de Rennes Julien, Tian, Nicolas, Brahim et Franziska pour être si sympas dépuis le début et pour faire si agréable et amusant mon séjour à Rennes. A Yomaira, Ali y Alex, gracias por el tiempo que pasamos juntos en Rennes y por hacerme sentir como en casa. A todos, muchísimas gracias por estar ahí cuando lo necesité, por vuestro tiempo y vuestro afecto. Aquí acaba una de las etapas más importantes de mi vida y no sé si la próxima será tan buena como la que estoy a punto de cerrar pero, sobre todo, espero que podáis seguir a mi lado.

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Cylindrical near‐to‐far‐field transformation system for radar antennas: Design, validation, and application

Cited by 5 publications

References 12 publications

Error Analysis and Simulator in Cylindrical Near-Field Antenna Measurement Systems

Error Analysis and Simulator in Cylindrical Near-Field Antenna Measurement Systems

A new proposal to convertnear-field into far-field for parabolic reflectors

Contribution to the uncertainty evaluation in the measurement of the main antenna parameters = Contribución a la evaluación de la incertidumbre en la medida de los principales parámetros de antena

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