scholarly journals Near-Field Characteristics of a TEM Horn Used for Radiated Immunity Tests

2021 ◽  
Author(s):  
Katsushige Harima ◽  
Takayuki Kubo ◽  
Kaoru Gotoh ◽  
Takeshi Ishida
Keyword(s):  
Near Field ◽  
Tem Horn

TEM horn antenna for near-field microwave imaging

2010 ◽  
Vol 52 (5) ◽  
pp. 1164-1170 ◽  
Author(s):  
Mark A. Campbell ◽  
Michal Okoniewski ◽  
Elise C. Fear
Keyword(s):  
Near Field ◽  
Horn Antenna ◽  
Microwave Imaging ◽  
Tem Horn

scholarly journals Three-Dimensional Near-Field Microwave Holography for Tissue Imaging

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Reza K. Amineh ◽  
Ali Khalatpour ◽  
Haohan Xu ◽  
Yona Baskharoun ◽  
Natalia K. Nikolova
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Near Field ◽  
Spherical Wave ◽  
Three Dimensional ◽  
Incident Field ◽  
Tissue Imaging ◽  
Imaging Results ◽  
Tem Horn ◽  
Imaging Algorithms

This paper reports the progress toward a fast and reliable microwave imaging setup for tissue imaging exploiting near-field holographic reconstruction. The setup consists of two wideband TEM horn antennas aligned along each other’s boresight and performing a rectangular aperture raster scan. The tissue sensing is performed without coupling liquids. At each scanning position, wideband data is acquired. Then, novel holographic imaging algorithms are implemented to provide three-dimensional images of the inspected domain. In these new algorithms, the required incident field and Green’s function are obtained from numerical simulations. They replace the plane (or spherical) wave assumption in the previous holographic methods and enable accurate near-field imaging results. Here, we prove that both the incident field and Green’s function can be obtained from a single numerical simulation. This eliminates the need for optimization-based deblurring which was previously employed to remove the effect of realistic non-point-wise antennas.

Near-Field Microwave Imaging Based on Aperture Raster Scanning With TEM Horn Antennas

2011 ◽  
Vol 59 (3) ◽  
pp. 928-940 ◽  
Author(s):  
Reza K. Amineh ◽  
Maryam Ravan ◽  
Aastha Trehan ◽  
Natalia K. Nikolova
Keyword(s):  
Near Field ◽  
Microwave Imaging ◽  
Horn Antennas ◽  
Raster Scanning ◽  
Tem Horn

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

Principles of Planar Near-Field Antenna Measurements

2007 ◽  
Author(s):  
Stuart Gregson ◽  
John McCormick ◽  
Clive Parini
Keyword(s):  
Near Field ◽  
Antenna Measurements

Immobilization of Radionuclides on Iron Canister Material at Simulated Near-field Conditions

2008 ◽  
Author(s):  
Daqing Cui ◽  
Ylva Ranebo ◽  
Jeanett Low ◽  
Vincenzo Rondinella ◽  
Jinshan Pan ◽  
...  
Keyword(s):  
Near Field ◽  
Field Conditions
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