An antenna system using a plasma column having a central conductor and excited by a co-axial line†

Ram, Dhani; Verma, J. S.

doi:10.1080/00207217308938588

Cited by 2 publications

(2 citation statements)

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“…radiation peak was found but the variation of the peak amplitude and its half-power beam width (HPBW) with the change in plasma density was noted as large. Ram and Verma [1972] also studied the radiation pattern of an open-ended coaxial line in a plasma column having a central conductor. In this case a radiation peak near and before the critical angle was found.…”

Section: Introductionmentioning

confidence: 99%

“…The radiation pattern is obtained as a vector sum of field components due to individual rings of current. By using the usual technique of integral transforms and saddle point integration, Ram and Verma [1972] have found the expression for the radiation field of a magnetic ring source in a plasma column having a central conductor along its axis. On the same lines, the expression for the radiation pattern of an electric ring source in a plasma column having a central conductor along its axis can be derived.…”

Section: Introductionmentioning

confidence: 99%

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An antenna system using a plasma column having a central conductor and excited by a waveguide

Ram¹,

Verma²

1974

Radio Science

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The radiation pattern of an open‐ended circular cylindrical waveguide (excited in the circular symmetric TE01 or TM01 modes) in a plasma column having a central conductor is studied. The field distribution at the open‐end cross section of the waveguide is assumed to be equivalent to the vector sum of current rings of various radii ranging from the outer radius of the central conductor to the inner radius of the circular waveguide at the open end. The radiation pattern is obtained as a vector sum of field components due to individual rings of current. This type of configuration gives rise to an enhanced radiation peak near and before the critical angle. The amplitude and sharpness of the radiation peak depends upon the dimensions of the plasma column, central conductor and the waveguide. The direction of the radiation peak can be changed by changing the plasma density. These results suggest development of an electronically scannable plasma antenna system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%