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Q 1. The figure of merit of a capacitor, inductor, or
inductance-capacitance (LC) circuit, equal to the
reactance divided by the resistance. 2. Symbol for
electrical charge. 3. Occasional symbol for SE-
LECTIVITY. 4. See Q BAND. 5. See Q OUTPUT.
q 1. Symbol for quantity of electricity (in
coulombs). 2. Symbol for the charge carried by an
electron (the charge carried by a hole is represented
by –q). 3. Symbol for the value of a quantum.
QA Abbreviation of QUALITY ASSURANCE.
Q adjustment The separate null adjustment for
the Q value of a component being tested in an
impedance bridge having separate resistive and
reactive balances.
Q-antenna An antenna in which the transmission
line (feeder) is matched in impedance to the center
of the radiator by means of a Q-matching section.
QAVC Abbreviation of QUIET AUTOMATIC VOL-
UME CONTROL.
Q band The radio-frequency band 36 to 46 GHz. It
is subdivided as follows: Q a , 36 to 38 GHz; Q b , 38
to 40 GHz; Q c , 40 to 42 GHz, Q d , 42 to 44 GHz;
and Q e , 44 to 46 GHz.
Q bar One of the parallel metal tubes in a
Q-matching section. Also see Q ANTENNA.
Q booster See Q MULTIPLIER.
Q bridge An alternating-current bridge used principally
to determine the Q of capacitors and
inductors. Bridges are usually used for
audio-frequency Q determinations; resonant-type
Q meters are generally used for measurement of
radio-frequency Q.
Feeder
Radiating element
Q-antenna
Q-matching
section
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