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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].
