Showing papers on "Guided wave testing published in 1966"
TL;DR: In this article, a theoretical analysis on the propagation of whistler radio waves along an enhanced or depressed magnetoplasma slab imbedded in an infinite magnetoplasmas is extended to include the general case of an arbitrary thickness of the slab.
Abstract: The previous theoretical analysis by the present author on the propagation of whistler radio waves along an enhanced or depressed magnetoplasma slab imbedded in an infinite magnetoplasma is extended to include the general case of an arbitrary thickness of the slab. As a result, two different types of completely guided waves are found to exist in general. The one guided wave is essentially a surface wave trapped along an interface between two semi-infinite plasmas of different plasma densities, while the other guided wave is a duct type of surface wave in which the whistler plane wave is predominantly propagated inside the slab by the successive total reflections at the walls of the slab and is propagated along the depressed plasma slab only. Dispersion properties of these completely guided waves are studied in detail.
12 citations
TL;DR: In this article, the tilt deformation of a confocal Fabry-Perot resonator is treated by the use of a perturbation method in solving the resonant integral equation based on the interferometer picture.
Abstract: A tilt deformation of a confocal Fabry-Perot resonator is treated by the use of a perturbation method in solving the resonant integral equation based on the interferometer picture. The tilt of the confocal mirrors is considered as the off-axial shift of mirrors along the spherical surfaces. The diffraction loss in the presence of the tilt deformation is computed numerically for some values of the Fresnel number and the deformation parameter. It is shown that the loss of a confocal resonator is not so sensitive to the tilt of the mirror as a plane resonator is. The diffraction losses of some modes of the guided wave beams calculated by Gouban et al. are again obtained as our specific case of no deformation, which can be compared favorably with theirs.
7 citations
TL;DR: In this paper, a self-consistent method was proposed to estimate the leakage of VLF energy into the ionosphere at large distances from the transmitter by assuming that the wave polarization of a modal field is preserved upon reflection at the waveguide boundaries.
Abstract: The penetration of VLF waves into the ionosphere is calculated from the mode representation of the fields in the earth-ionosphere waveguide. This calculation is more appropriate for evaluation of leakage of VLF energy into the ionosphere at large distances from the transmitter than is the calculation based on a ray theory representation of the fields. The ratio of the amplitude of the field excited in the ionosphere to that observed on the earth is found to agree with the observations of the LOFTI I experiment.
In carrying out the analysis of the leakage of energy from the waveguide modes, it is necessary to reevaluate the modal propagation constants, employing a self-consistent calculation requiring that the wave polarization of a modal field be preserved upon reflection at the waveguide boundaries. Upon imposing these conditions, it is found that two sets of modes result, having different polarizations. These sets of modes have been designated as quasi-TE and quasi-TM.by Budden, but both sets tire no1 usually used in VLF field strength calculations. Under nighttime conditions, both types of modes will be of importance, while in daytime only the quasi-TM modes will be excited by a vertical monopole antenna on the earth. These results predict a nonreciprocal attenuation over a north-south propagation path.
3 citations
16 May 1966
TL;DR: In this article, a finite-difference technique for the determination of the propagation coefficient of rectangualr waveguide containing longitudinally-magnetized ferrite was described, the technique being applied to ferrite phase-shifter configurations.
Abstract: Following a brief resume of general microwave research in British Universities, topics in guided wave propagation will be discussed. These will include studies of both uniform and periodic inhomogeneously-filled waveguides containing either dielectric or ferrite, and homogeneously-filled waveguides of arbitrary cross-section. Recent theoretical and experimental results obtained for backward-wave uniform inhomogeneous structures will be presented, together with a description of their applications in delay lines for pulse-compression RADAR. A finite-difference technique for the determination of the propagation coefficient of rectangualr waveguide containing longitudinally-magnetized ferrite will be described, the technique being applied to ferrite phase-shifter configurations. Another finite-difference technique developed by J. B. Davies of Sheffield treats waveguides of arbitrary cross-section; this technique and its applications will also be discussed.
2 citations