Exact amplitudes and intensities of evanescent E_(ev) and propagating E_p fields, including interference terms, are presented both in near and far field regions. It is shown that the amplitude of E_(ev) decays as exp(-r/w_a) in near-field region and evanescent waves do not contribute ...
A half-wave dipole antenna is used as a standard of comparison. Two important properties of the finite-length, center-fed dipole antenna are the radiation pattern and the input impedance. The radiated electric field is found through Maxwell’s equations, and i...
Fig. 2: Comparative analysis of path gain and wave impedance in near-field and far-field regions of radar antenna. a Investigation of the path gain versus radar range variations for the near-field in comparison to the far-field. b Variations of the free-space wave impedance in the near-fi...
Experimental and Modelling studies have been used to investigate the biogeochemical processes occurring at the interface zone between the near-field and far-field of the Drigg Low-Level radioactive Waste (LLW) trenches. These have led to a conceptual model of interface biogeochemistry, which has su...
INDUCTION ZONE STATIC OR QUASISTATIC FIELD FAR FIELD FRAUNHOFER ZONE FAR FIELD RADIATION ZONE FAR FIELD 1 r 1 r 2 r 3 1 r 2 1 r 3 1 1 r DOMINANT TERMS IN THE REGION , THREE-REGION MODEL TWO-REGION MODEL Two- and three-region models describe the regions around an electromagnetic ...
This letter presents the design of a switchable near-field (NF) and far-field (FF) reader antenna for ultra-high frequency (UHF) radio frequency identification (RFID) applications. Current distribution of an antenna array comprised of four dipoles can be switched via reconfigurable feeding network...
Based on this, we conceive a phase-delay focusing method for mitigating the near-field beam-split effect. Moreover, we introduce a new metric, termed the effective Rayleigh distance, which is more accurate in distinguishing the far-field and near-field regions than the classical Rayleigh ...
regions23. Although it is highly unlikely that air pollution can be eliminated completely, it is realistic to imagine that air pollution can be reduced substantially through effective public policy, and indeed it already has been in various parts of the world. It is therefore an important ...
Experiments indicate the presence of three regions: a region close to the burner surface where plume entrainment rates are independent of the fuel flow (or heat release) rates; a far field region above the flame top, where a simple point source model correlates the data reasonably well; and ...
fourth largest city, the provincial capital of Sichuan Province, Chengdu is at the centre of southwestern economy and technology. The city's significance increased when the Vietnam War began escalating in 1964, and the Chinese government responded by investing heavily in regions far from the ...