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Appendix I Glossary - 14183_167
Appendix I - Continued - 14183_169

Neets Module 11-Microwave Principles
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AI-2 DOMINANT MODE—The easiest mode to produce in a waveguide, and also, the most efficient mode in terms of energy transfer. DRIFT SPACE—In an electron tube, a region free of external fields in which relative electron position depends on velocity. DUMMY LOAD—A device used at the end of a transmission line or waveguide to convert transmitted energy into heat so no energy is radiated outward or reflected back. E-FIELD—Electric field that exists when a difference in electrical potential causes a stress in the dielectric between two points. E-TYPE T-JUNCTION—A waveguide junction in which the junction arm extends from the main waveguide in the same direction as the E-field in the waveguide. ELECTRIC FIELD—See E-field. ELECTRONIC TUNING—In a reflex klystron, changing the frequency and output power of the tube by altering the repeller voltage. ELECTROLYSIS—Chemical changes produced by passing an electrical current from one substance (electrode) to another (electrolyte). ELECTRON ORBITAL MOVEMENT—The movement of an electron around the nucleus of an atom. ELECTRON SPIN—The movement of an electron around its axis. ELEVATION ANGLE—The angle between the line of sight to an object and the horizontal plane. FARADAY ROTATION—The rotation of the plane of polarization of electromagnetic energy when it passes through a substance influenced by a magnetic field that has a component in the direction of propagation. FERRITE—A powdered and compressed ferric oxide material that has both magnetic properties and resistance to current flow. FERRITE SWITCH—A ferrite device that blocks the flow of energy through a waveguide by rotating the electric field 90 degrees. The rotated energy is then reflected or absorbed. GRID-GAP TUNING—A method of changing the center frequency of a resonant cavity by physically changing the distance between the cavity grids. GROUP VELOCITY—The forward progress velocity of a wave front in a waveguide. H-FIELD—Any space or region in which a magnetic force is exerted. The magnetic field may be produced by a current-carrying coil or conductor, by a permanent magnet, or by the earth itself. H-TYPE T-JUNCTION—A waveguide junction in which the junction arm is parallel to the magnetic lines of force in the main waveguide.






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