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Technical
Glossary - W, X, Y, Z
| A
| B | C
| D | E
| F | G
| H |I
| J,K | L
| M | N
| O | P
| Q | R
| S | T
| U,V | W,X,Y,Z
| Spec. Char.,
Number |
W
(see "watt")
Wafer
A thin, right cylindrical section slice of a semiconductor
ingot or boule, from which discrete semiconductors
or integrated circuits are manufactured. For RF/microwave
devices, a wafer is typically 4 - 6 inches or
100 - 200 mm in diameter, and from 0.005 to 0.030
inches thick.
WAN
Wide area network.
Watt
The unit for power, abbreviated as "W,"
equal to 1 joule per second.
Wave
A disturbance that is a function of time, space
or both.
Waveform
The geometric shape of one period of an electric
signal when it is plotted or displayed versus
time or some other variable.
Waveguide
A system of material boundaries that direct electromagnetic
energy waves. There are many different waveguide
configurations, the most popular of which is constructed
from hollow rectangular, elliptical or circular
cross sections of metal. Some waveguides are filled
with materials whose dielectric constants are
higher than that of air, such as Teflon".
Waveguides can also be implemented on the surface
of a printed circuit board, as is the case for
coplanar waveguide.
Wavelength
The physical distance between two points of identical
phase on consecutive cycles of a wave. The symbol
for wavelength is lambda, "l". Wavelength
is related to frequency according to the equation
l=c/f, where c is the speed of light (3*108 m/s)
f is frequency in Hz.
WCDMA
Wideband code division multiple access. Wideband
CDMA, developed by Ericsson and others, provides
higher data rates than present CDMA systems, and
has been selected for the third generation of
mobile telephone systems in Europe, Japan and
the United States.
White
Noise
Noise with constant energy per unit bandwidth
that is independent of the central frequency.
Wideband
A loosely used term that indicates a large bandwidth
to center frequency ratio. A system is considered
to be wideband if this ratio is greater than approximately
10 percent.
Wilkinson
Splitter
A transmission line structure that splits power
incident on the input port into two or more output
ports. In most implementations, the power is divided
equally. A Wilkinson splitter can also be used
to combine two or more signals.
Wire
Bonding
(See "bonding")
WLAN
Wireless local area network
WLL
Wireless local loop.
X
(See "reactance")
X-Axis
The abscissa or horizontal axis in a cartesian
plane.
Xistor
(See "transistor")
Xstr
(See "transistor")
Y
(See "admittance")
Y-Axis
The ordinate or vertical axis in a cartesian plane
y-Parameter
The set of parameters for a two port device that
relates the input and output currents to the input
and output voltages.
Z
(See "impedance")
Z0
The characteristic impedance of a device or system.
z-Parameter
The set of parameters for a two port device that
relates the input and output voltages to the input
and output currents.
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