Accession Number : AD0288694

Title :   INVESTIGATION OF MICROWAVE DUPLEXER SWITCHING MECHANISMS

Corporate Author : ILLINOIS UNIV URBANA ELECTRICAL ENGINEERING RESEARCH LAB

Report Date : 15 SEP 1962

Pagination or Media Count : 1

Abstract : Further information regarding the nature of longitudinal waves produced in low pressure gases by a high intensity electromagnetic field of microwave frequency is reported. The waves are set up in a gas which is contained within a glass tube, the end of which extends into an S Band waveguide through a hole cut in the E plane of the waveguide. A magnetron produces high power 1 micron sec pulses which travel down the waveguide and set up a plasma within the tube for some distance outside of the waveguide. After a short time delay (tau > 10 microns sec) two distinct perturbations are observed to travel in this plasma down the tube away from the waveguide. It is observed that the velocity of these waves is increased when the electrons are heated in the region through which they are passing, but, if the neutral gas itself is heated, the velocity is unchanged, although the time delay between the microwave pulse and the appearance of the waves is shortened. It is also demonstrated that the waves will propagate through a region of the discharge tube from which no light is being emitted. (Author)

Descriptors :   *MICROWAVE EQUIPMENT, *MICROWAVES, *PLASMAS(PHYSICS), *RADAR DUPLEXERS, *SWITCHING CIRCUITS, *WAVE PROPAGATION, GASES, MOLECULES, NITROGEN, S BAND, SOUND, TEMPERATURE

Distribution Statement : APPROVED FOR PUBLIC RELEASE