Neets Master Glossary

1-33 HORIZONTALLY POLARIZED—Waves radiated with their E field component parallel to the earth's surface [10]. HORIZONTAL PATTERN—The part of a radiation pattern that is radiated in all directions along the horizontal plane [10]. HORIZONTAL PLANE—An imaginary plane that is tangent (or parallel) to the earth's surface at a given location [11] [18]. HORN—A funnel-shaped section of waveguide used as a termination device and as a radiating antenna [11]. HORN ANTENNA—See HORN RADIATOR [18]. HORN RADIATOR—A tapered, tubular or rectangular microwave antenna that is widest at the open end [18]. HORSEPOWER—The English unit of power equal to work done at the rate of 550 foot-pounds per second; equal to 746 watts of electrical power [1]. HORSESHOE MAGNET—A permanent magnet or electromagnet bent into the shape of a horseshoe or having a U-shape to bring the two poles near each other [1]. HOT CARRIER—A carrier, which may be either a hole or an electron, that has relatively high energy with respect to the carriers normally found in majority-carrier devices [11]. HOT-CARRIER DIODE—A semiconductor diode in which hot carriers are emitted from a semiconductor layer into the metal base. Also called HOT-ELECTRON DIODE. An example is the Schottky barrier diode [11]. HOT-WIRE METER MOVEMENT—A meter movement that uses the expansion of a heated wire to move the pointer of a meter; measures dc or ac [3]. H-TYPE T-JUNCTION—A waveguide junction in which the junction arm is parallel to the magnetic lines of force in the main waveguide [11]. HYBRID CIRCUIT—A circuit where passive components (resistors, capacitors) are deposited onto a substrate made of glass, ceramic, or other insulating material. Then the active components (diodes, transistors) are attached to the substrate and connected to the passive components on the substrate with a very fine wire [7]. HYBRID ICs—Two or more integrated circuit types, or one or more integrated circuit types and discrete components on a single substrate [14]. HYBRID JUNCTION—A waveguide junction that combines two or more basic T-junctions [11]. HYBRID MIXER—See BALANCED MIXER [18]. HYBRID RING—A hybrid-waveguide junction that combines a series of E-type T-junctions in a ring configuration. When properly terminated, energy is transferred from any one branch into any two of the remaining three branches [11] [18]. HYDROMETER—An instrument used to measure specific gravity. In batteries hydrometers are used to indicate the state of charge by the specific gravity of the electrolyte [1].