HORIZONTALLY POLARIZEDWaves radiated with their E field component parallel to the earth's
HORIZONTAL PATTERNThe part of a radiation pattern that is radiated in all directions along the
horizontal plane .
HORIZONTAL PLANEAn imaginary plane that is tangent (or parallel) to the earth's surface at a given
location  .
HORNA funnel-shaped section of waveguide used as a termination device and as a radiating antenna
HORN ANTENNASee HORN RADIATOR .
HORN RADIATORA tapered, tubular or rectangular microwave antenna that is widest at the open end
HORSEPOWERThe English unit of power equal to work done at the rate of 550 foot-pounds per
second; equal to 746 watts of electrical power .
HORSESHOE MAGNETA permanent magnet or electromagnet bent into the shape of a horseshoe or
having a U-shape to bring the two poles near each other .
HOT CARRIERA 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 .
HOT-CARRIER DIODEA 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
HOT-WIRE METER MOVEMENTA meter movement that uses the expansion of a heated wire to
move the pointer of a meter; measures dc or ac .
H-TYPE T-JUNCTIONA waveguide junction in which the junction arm is parallel to the magnetic lines
of force in the main waveguide .
HYBRID CIRCUITA 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 .
HYBRID ICsTwo or more integrated circuit types, or one or more integrated circuit types and discrete
components on a single substrate .
HYBRID JUNCTIONA waveguide junction that combines two or more basic T-junctions .
HYBRID MIXERSee BALANCED MIXER .
HYBRID RINGA 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  .
HYDROMETERAn instrument used to measure specific gravity. In batteries hydrometers are used to
indicate the state of charge by the specific gravity of the electrolyte .