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The sharp gradient in the intensity of a surface wave over a simiconductor-vacuum interface gives rise to a strong ponderomotive force on electrons and thus generates a second harmonic wave. The power of the second harmonic shows a resonance at (ω and ωp being the wave and plasma frequencies) and tends to a saturation value at very high values of ωp. 相似文献
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This paper presents an investigation of the effect of collisionless plasma on the equatorial gain of a high power dipole antenna.
The plasma experiences a ponderomotive force in the non-uniform radiation field and the electron density gets redistributed;
the plasma gets depleted in the centre and the near equatorial zone of the antenna. This nonuniformity in the electron density
(hence in the dielectric constant) tends to converge the electromagnetic power to the equatorial zone. For typical parameters
a 20% (i.e., ∼1 dB) enhancement in the gain of the antenna has been predicted within the limits of the perturbation theory.
Work partially supported by NSF (USA) 相似文献
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M. S. Sodha Prayag Chandra V. K. Tripathi 《Applied Physics A: Materials Science & Processing》1976,11(3):299-301
Using an appropriate expression for the field-dependent dielectric constant of a collisionless plasma, we have studied the
field distribution of the TM01 mode in a cylindrical waveguide. The wave equation has been solved by a Runge Kutta technique. It is seen that on account
of redistribution of carriers from the high-field regions to low-field regions a beam of frequency lower than the average
plasma frequency can be transmitted if its power is high.
Work supported by NSF 相似文献
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