The prediction of aerial radiation patterns from near-field measurements

Brown, J.; Jull, E.V.

doi:10.1049/pi-b-2.1961.0109

Cited by 77 publications

(41 citation statements)

References 6 publications

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“…A technique to overcome this problem has been described [27,28]. The basis of this technique is to replace the offset radiated reference wave by an electronically synthesized reference wave.…”

Section: Formation Of Holographic Intensity Patternmentioning

confidence: 99%

Early Stage Breast Cancer Detection Using Indirect Microwave Holography

Elsdon¹,

Yurduseven²,

Smith³

2013

PIER

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Abstract-A novel microwave imaging approach for early stage breast cancer detection is described. The proposed technique involves the use of an Indirect Microwave Holographic technique employing a patented synthetic reference wave. This approach offers benefits in terms of simplicity, expense, comfort and safety when compared to current mammography techniques. Experimental results using a simulated breast phantom are included to demonstrate the validity of this technique to obtain 2D images. The technique is then extended to demonstrate the possibility of obtaining 3D images by using indirect stereoscopic holographic imaging.

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Section: Formation Of Holographic Intensity Patternmentioning

confidence: 99%

Early Stage Breast Cancer Detection Using Indirect Microwave Holography

Elsdon¹,

Yurduseven²,

Smith³

2013

PIER

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“…Near-field radiation patterns are useful in diagnosing antenna arrays defects [1], measuring far-field antenna patterns where the far-field is prohibitively far [2], and locating field concentrations in high power microwave applications [3], which could lead to material breakdown. There are two categories of near-field measurements: direct and indirect.…”

Section: Introductionmentioning

confidence: 99%

Development of an Optically Modulated Scatterer Probe for a Near-Field Measurement System

Patrick¹,

Hutchinson²,

Boos³

2016

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Standard Form 298 (Rev. 8-98)Prescribed by ANSI Std. Z39.18Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S ACRONYM(S) 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S REPORT NUMBER(S) Near-field measurement PhotodiodesIn high-fidelity, near-field measurements, the measurement probe must minimally impact the near-field of the antenna-under-test. To accomplish this, we developed an optically modulated, near-field probe which consists of a rectangular dipole antenna loaded with a photodiode. The modulation scheme separates scattering off of the probe from background reflections. We present the design and performance of an optically modulated scatterer (OMS) probe for use in a near-field measurement system.

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“…In this case, the scattering matrix formulation is employed to derive the coupling equation. A third approach, introduced by Brown and Jull in [Brown & Jull, 1961] and Leach and Paris in [Leach & Paris, 1973], is based on the three-dimensional vector cylindrical wave expansion of an electromagnetic field which applies the Lorentz reciprocity theorem formulation to attain the complete vector farfield pattern of an arbitrary antenna. In addition to the procedure proposed by Leach, Bucci in [Bucci, 1988] and Hussein and Rahmat-Samii in [Hussein & Rahmat-Samii, 1993] studied some improvements in efficiency of this method.…”

Section: Introductionmentioning

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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The prediction of aerial radiation patterns from near-field measurements

Cited by 77 publications

References 6 publications

Early Stage Breast Cancer Detection Using Indirect Microwave Holography

Early Stage Breast Cancer Detection Using Indirect Microwave Holography

Development of an Optically Modulated Scatterer Probe for a Near-Field Measurement System

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

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