scholarly journals WAVEGUIDE AS A NEAR-FIELD MEASURING PROBE OF THE TWO-ELEMENT ARRAY RADIATOR

2008 ◽  
Vol 7 ◽  
pp. 245-255 ◽  
Author(s):  
Sri Paramesha ◽  
Ajay Chakraborty
Keyword(s):  
Near Field ◽  
Measuring Probe ◽  
Field Measuring ◽  
Element Array

scholarly journals RATAN-600 as a MM-Array

1994 ◽  
Vol 140 ◽  
pp. 392-397
Author(s):  
Yu.N. Parijskij ◽  
G.A. Pinchuk ◽  
O.V. Verkhodanov ◽  
V.B. Khaikin ◽  
Yu.K. Zverev ◽  
...  
Keyword(s):  
Focal Plane ◽  
Near Field ◽  
Field Of View ◽  
Dimensional Synthesis ◽  
Present Stage ◽  
Feed System ◽  
Field Zone ◽  
3 Dimensional ◽  
Element Array ◽  
Selection Of

AbstractIt is shown that multi-elements surface of the Russian biggest reflector may be considered as a 1000-element array with limited freedom of motions of each element. This limitation may be compensated by selection of the proper “virtual sub-array” of elements at any given direction of observations. This approach is especially effective for mm-waves where field of view of 600-meter reflector in usual mode is less than 1 arcsec. The present stage of realization of that project is shortly discussed, including requirements for multi-feed system near the focal plane of the radio telescope, wavelength limitations and error budget, and near field zone 3-dimensional synthesis mode of observation.

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
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