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86 Terms
Dielectrics in the line
What determines the velocity factor in transmission line?
100 W
.A transmission line has a capacitance of 25 pF / ft. and an inductance of 0.15 mH / ft. Determine the characteristic impedance of the line.
electric field is perpendicular to the direction of wave propagation
.In a waveguide, the TE mode means that the:
6 dB
Determine the dB gain of a receiving antenna which delivers a microvolt signal to a transmission line over that of an antenna that delivers a 2 microvolt signal under identical circumstances.
32.26 cycles
How many cycles of a 1- MHz wave can a 6-mile transmission line accommodate?
Skin Effect
Power loss in a conductor at microwave frequencies due to increased effective resistance.
Cut-off Wavelength
The wavelength at which a waveguide can no longer support a certain mode of operation.
S Parameter
The ratio of incident and reflected voltage waves used to characterize linear microwave devices.
Dominant Mode Wavelength
The longest wavelength a waveguide can support in the dominant mode.
Smith Chart
A graphical tool developed by Philip H. Smith for solving transmission line problems.
Standing Waves
Waves that result from interference on a transmission line, affecting power distribution.
Return Loss
A measure of the mismatch between a load and a transmission line.
Distributed Capacitance
The capacitance distributed along a coaxial transmission line affecting its characteristic impedance.
SWR (Standing Wave Ratio)
A measure of how well a load is matched to a transmission line.
Normalized Impedance
The impedance of a circuit normalized to a reference impedance.
Waveguide Impedance
The characteristic impedance commonly found in waveguides.
Conductor
The material through which electric current flows.
Coaxial transmission line
A type of electrical cable consisting of an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield.
Standing Wave Ratio (SWR)
A measure of how well a load is matched to a transmission line.
Reactance
The opposition of a circuit element to the flow of alternating current due to capacitance or inductance.
Reflectometer
An electronic equipment used to measure standing wave ratio.
Quarter-wave transformer
A short length of transmission line, shorted at one end and attached at a specific distance from the load to match a complex load to the transmission line.
Balun
A device used to connect a balanced transmission line to an unbalanced transmission line.
Characteristic Impedance
The ratio of voltage to current in a transmission line.
Waveguide
A structure that guides electromagnetic waves in a specific direction.
Smith Chart
A graphical tool used to solve transmission line problems.
Phase velocity
The speed at which the phase of a wave propagates in space.
Group velocity
The speed at which the envelope of a wave's amplitudes propagates.
Grounded line
A transmission line that uses ground return for the signal path.
Termination
The end of a transmission line where it is connected to a load.
Open-wire line
A transmission line consisting of two conductors with equal resistance per unit length.
Coaxial lines
Used in systems operating below 2 GHz.
Attenuation Constant
The transmission line parameter that represents the decrease in the signal strength.
Voltage Reflection Coefficient
The reflection coefficient for a specific transmission line with terminating impedance.
Velocity Factor
The meaning of the term velocity factor of a transmission line.
Waveguide
A waveguide can be considered as a specific type of filter.
Impedance Matching
The importance of matching the impedance of a transmission line to the antenna.
Coaxial Cable
A type of transmission line consisting of an inner conductor surrounded by an outer conductor.
Bolometer
A type of semiconductor device used for measuring radiation.
Quarter-Wave Transformer
A transformer used to match different impedances in transmission lines.
Standing Waves
The distance between a voltage maximum and adjacent current maximum on a transmission line.
SWR Measurement
The instrument used to measure Standing Wave Ratio (SWR) in a transmission line.
Guide Wavelength
The wavelength in a waveguide based on specific dimensions and frequency.
Characteristic Impedance
The impedance measured at a specific point on a transmission line when its length is infinite.
Dominant Mode
The primary mode of propagation in a rectangular waveguide.
Ideal Conductor
The best conductor material to use in an ideal transmission line.
Isolator
A ferrite device used in place of a duplexer to isolate a microwave transmitter and receiver when both are connected to the same antenna.
Input Impedance
The impedance of a shorted lossless line of length wavelength/4, which is typically denoted as Z0.
VSWR
Voltage Standing Wave Ratio, where minimum VSWR indicates the best matching of antenna to the transmission line.
Klystron
A type of vacuum tube where the main frequency determining element is the resonant cavity.
Waveguide Mode
The mode at which a waveguide operates is determined by factors like the shape, coupling method, length, and impedance of the waveguide.
SWR of 1
A transmission line has an SWR equal to 1 when the load impedance (ZL) is equal to the characteristic impedance (Z0) of the line.
Parallel-Resonant Circuit
A l / 4 stub in a parallel-resonant circuit must be open at the ends.
Current and Voltage Ratio
In a transmission line, if the maximum current to minimum current ratio is 2:1, the ratio of the maximum voltage to minimum voltage is 1:4.
Quarter-Wave Stub
A quarter-wave stub in free space at 4 GHz has a length of 19 cm.
Matching Stub Placement
A matching stub should be placed nearest to the load for effective matching.
Coaxial Transmission Line
A type of transmission line consisting of two conductors where the center conductor is surrounded by the outer conductor, commonly used for high-frequency signals.
Balanced Transmission Line
A type of transmission line where the two conductors carry equal current, ensuring balanced signal transmission.
Waveguide
A structure that guides electromagnetic waves, typically used at microwave frequencies.
Quarter-Wave Transformer
A type of transformer used to match impedances between different transmission lines.
Microwave Diodes
Electronic components suitable for specific functions in microwave circuits.
Voltage Node
A point in a circuit where the voltage is at a minimum or zero.
Microstrip
A type of microwave transmission line used with printed circuits.
Stub-Matching Network
A network used to eliminate standing waves in transmission lines.
Characteristic Impedance
The impedance seen by a transmission line when it is infinitely long.
Standing Waves
Waves that appear to be stationary, formed by the interference of incident and reflected waves in a transmission line.
Transmission Lines
Conductive pathways that carry electrical signals from one point to another.
Balanced
Transmission lines that have equal electrical characteristics with respect to ground.
Unbalanced
Transmission lines that have unequal electrical characteristics with respect to ground.
Skin Effect
The tendency of AC conductors to carry current on their surface.
Klystron
A device known for its high power and efficiency in signal transmission.
Coaxial Cable
A transmission line capable of handling high-powered signals.
Standing Wave Ratio (SWR)
The ratio of maximum to minimum voltage on a transmission line.
Dielectric Constant
Refers to the permittivity of a material in a transmission line.
Velocity Factor
The ratio of the velocity of a wave in a transmission line to the speed of light in a vacuum.
Waveguide
A type of transmission line used for guiding electromagnetic waves.
Circular Waveguide
A waveguide used in radar systems.
Smith Chart
A tool used for determining antenna impedance.
Helical Resonators
Components that use loop coupling for signal transmission.
Cut-off Frequency
The frequency at which a waveguide does not propagate signals effectively.
Aspect Ratio
The ratio of the longer side to the shorter side of a rectangular waveguide.
Gamma Match
A type of transmission line used for impedance matching.
Attenuation
The decrease in signal strength as it travels along a transmission line.
Dummy Load
An artificial load used to simulate an antenna for testing purposes.
Reflection Coefficient
The ratio of reflected to incident voltage on a transmission line.
Standing Waves
Waves that result from interference of incident and reflected waves on a