Surface-Wave Green's Tensors in the Near Field

2014 ◽  
Vol 104 (3) ◽  
pp. 1578-1586 ◽  
Author(s):  
M. M. Haney ◽  
H. Nakahara
Keyword(s):  
Surface Wave ◽  
Near Field

scholarly journals Surface Wave Multipath Signals in Near-Field Microwave Imaging

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Paul M. Meaney ◽  
Fridon Shubitidze ◽  
Margaret W. Fanning ◽  
Maciej Kmiec ◽  
Neil R. Epstein ◽  
...  
Keyword(s):  
Surface Wave ◽  
Surface Waves ◽  
Antenna Arrays ◽  
Imaging Techniques ◽  
Near Field ◽  
Microwave Imaging ◽  
Feed Line ◽  
Receiving Antenna ◽  
Wave Effects ◽  
Multipath Signals

Microwave imaging techniques are prone to signal corruption from unwanted multipath signals. Near-field systems are especially vulnerable because signals can scatter and reflect from structural objects within or on the boundary of the imaging zone. These issues are further exacerbated when surface waves are generated with the potential of propagating along the transmitting and receiving antenna feed lines and other low-loss paths. In this paper, we analyze the contributions of multi-path signals arising from surface wave effects. Specifically, experiments were conducted with a near-field microwave imaging array positioned at variable heights from the floor of a coupling fluid tank. Antenna arrays with different feed line lengths in the fluid were also evaluated. The results show that surface waves corrupt the received signals over the longest transmission distances across the measurement array. However, the surface wave effects can be eliminated provided the feed line lengths are sufficiently long independently of the distance of the transmitting/receiving antenna tips from the imaging tank floor. Theoretical predictions confirm the experimental observations.

scholarly journals Near-field investigation of THz surface-wave emission from optically excited graphite flakes

2011 ◽  
Vol 19 (5) ◽  
pp. 4667 ◽  
Author(s):  
M. Nagel ◽  
A. Michalski ◽  
T. Botzem ◽  
H. Kurz
Keyword(s):  
Surface Wave ◽  
Near Field ◽  
Field Investigation ◽  
Wave Emission
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