Aspects on the Phase Delay and Phase Velocity in the Electromagnetic Near-Field

Stén, Johan C.-E.; Hujanen, Arto

doi:10.2528/pier05051201

Cited by 19 publications

(13 citation statements)

References 9 publications

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“…The next step of our work is the investigation of an influence of magnetic field fluctuations on the APS in turbulent magnetized ionospheric plasma. Study of the spatial spectrum of multiply scattered radiation emitted by cylindrical antenna in a magneto-plasma [23,24] is of a crucial importance under conditions of actual experiment.…”

Section: Resultsmentioning

confidence: 99%

Model Computations of Angular Power Spectra for Anisotropic Absorptive Turbulent Magnetized Plasma

Jandieri¹,

Ishimaru²,

Jandieri³

et al. 2007

PIER

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Abstract-Electromagnetic waves scattering in turbulent anisotropic collision magnetized ionospheric plasma is investigated using complex geometrical optics approximation.Correlation function of the phase fluctuations of scattered radiation is obtained taking into account both electron density and magnetic fields fluctuations. The features of the angular power spectrum of scattered radiation are investigated analytically and numerically. The expressions of broadening of the spatial spectrum have been obtained for both powerlaw and anisotropic Gaussian correlation functions of electron density fluctuations. Gaussian spectral function takes into account the axial ratio of the field-aligned irregularities and the angle of inclination of prolate irregularities with respect to the external magnetic field. The variance of the phase and scintillation level of scattered radiation are calculated numerically for F -region irregularities of the ionosphere. The conditions of non-fully and fully developed diffraction patterns have been determined.

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Section: Resultsmentioning

confidence: 99%

Model Computations of Angular Power Spectra for Anisotropic Absorptive Turbulent Magnetized Plasma

Jandieri¹,

Ishimaru²,

Jandieri³

et al. 2007

PIER

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“…As reported in [22][23][24], the definition of the dipole moment exhibited by a time-dependent electric dipole having a physical length d at the time t on the point M situated at the distance r of this source is expressed as:…”

Section: Description Of the Considered Transient Radiation Sourcementioning

confidence: 99%

E-Field Extraction From H-Near-Field in Time-Domain by Using PWS Method

Ravelo¹

2010

PIER B

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Abstract-A novel technique of the electric-or E-field extraction from the magnetic-or H-near-field in time-domain is reported.This technique is based on the use of the Maxwell-Ampere relation associated to the plane wave spectrum (PWS) transform. It is useful for the E-near-field computations and measurements which are practically complicated in time-domain in particular, for the EMC applications. The considered EM-field radiation is generated by a set of electric dipoles excited by an ultra-short duration current having frequency bandwidth of about 10-GHz. The presented EMfield calculation technique is carried out by taking into account the evanescent wave effects. In the first step, the time-dependent H-field data mapped in 2-D plan placed at the height z 0 above the radiating devices are transposed in frequency-dependent data through the fast Fourier transform. In order to respect the near-field approach, the arbitrary distance z 0 between the EM-field mapping plan and radiating source plan should be below one-sixth of the excitation signal minimal wavelength. In the second step, one applies the PWS transform to the obtained frequency-data. Then, through the Maxwell-Ampere relation, one can extract the E-field from the calculated PWS of the H-field. In the last step, the inverse fast Fourier transform of the obtained Efield gives the expected time-dependent results. The relevance of the proposed technique was confirmed by considering a set of five dipole sources placed arbitrarily in the horizontal plan equated by z = 0 and excited by a pulse current having amplitude of 50 mA and half-width of about 0.6 ns. As expected, by using the H x , H y and H z 2-D data calculated with Matlab in the rectangular plan placed at z 0 = 3 mm and z 0 = 5 mm above the radiating source, it was demonstrated that

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“…It can be seen that the first appearance of oscillation occur at time ∼6.5 ns. Conclusion is which 10 nanoseconds delay is come from 6.5 nanoseconds delay of propagation in waveguide [22] and another reason that cause the microwave to generate 3.5 nanoseconds after beam entrance to the waveguide. Figure 10 shows the electrons momentum versus their axial position just beginning the pulse.…”

Section: Rationalizing Of the Delaymentioning

confidence: 99%