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Group velocity in a waveguide is speed at which EM energy travels in the guide.It will always be less then speed light.
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What is the dominant mode in rectangular waveguide?
Rectangular Waveguide - TE10; (TM11 in case of TM waves) Circular Waveguide - TE11;
Why must the air inside a waveguide be dehumidified?
Moisture in the air in a waveguide can scatter the microwave energy the waveguide is designed to transport. This translates into signal loss or attenuation. The VSWR drops, and that is not a good thing.
What are the Differences between horn antenna and waveguide?
waveguide is a metal pipe that contains and guides microwaves from place to place in a microwave system (e.g. oscillators, amplifiers, mixers, modulators, filters, antennas)horn antenna has a waveguide connected at its focus, in transmit mode the waveguide feeds the horn which then emits a microwave beam, in receive mode the horn collects a microwave beam and concentrates it int the waveguide
Which antenna is best excited by a wave guide?
Horn Antenna is best exited by waveguide
What is function of waveguide in microwave devices?
It replaces a coax cable, which won't work at those frequencies.
When a wave travelling in air enters into a waveguide The phase velocity will increase?
increases
Why wavelength in guide is greaterthan free space wavelength?
Because the propagation velocity in the waveguide is less than in free space.
What is the dominant mode in rectangular waveguide?
Rectangular Waveguide - TE10; (TM11 in case of TM waves) Circular Waveguide - TE11;
Why the phase velocity in a waveguide can exceed the velocity of light?
Guide wavelength is defined as the distance between two equal phase planes along the waveguide. The guide wavelength is a function of operating wavelength (or frequency) and the lower cutoff wavelength, and is always longer than the wavelength would be in free-space. Here's the equation for guide wavelength:Guide wavelength is used when you design distributed structures in waveguide. For example, if you are making a PIN diode switch with two shunt diodes spaces 3/4 wavelength apart, use the 3/4 of a guide wavelength in your design. The guide wavelength in waveguide is longer than wavelength in free space. This isn't intuitive, it seems like the dielectric constant in waveguide must be less than unity for this to happen... don't think about this too hard you will get a headache. === ===
What is group velocity and phase velocity?
yes
What is the difference between group velocity and phase velocity in a stationary wave on a string?
The velocity of a wave which maintains consatnt phase at all successive positions during propogation is known as wave velocity or phase velocity. The velocity of a group of waves which maintains constant poditions during the propogation is known as group velocity.
What is group velocity?
The official definition for the word group velocity is "the speed at which the energy of a wave travels."
When is it advantageous to use a circular waveguide?
Circular waveguides offer implementation advantages over rectangular waveguide in Calculations for circular waveguide requires the application of Bessel.
What is variable attenuator?
A variable attenuator is a device used to adjust the signal strength of a radio frequency or optical signal. It can be used to reduce the intensity of the signal by an adjustable amount to prevent overloading or distortion in the receiving equipment. Variable attenuators are commonly used in communication systems, test and measurement equipment, and audio systems to control signal levels.
When is an object said to have uniform velocity?
It isn't. Constant velocity? Uniform velocity across a group of objects?
Why must the air inside a waveguide be dehumidified?
Moisture in the air in a waveguide can scatter the microwave energy the waveguide is designed to transport. This translates into signal loss or attenuation. The VSWR drops, and that is not a good thing.
What are the Differences between horn antenna and waveguide?
waveguide is a metal pipe that contains and guides microwaves from place to place in a microwave system (e.g. oscillators, amplifiers, mixers, modulators, filters, antennas)horn antenna has a waveguide connected at its focus, in transmit mode the waveguide feeds the horn which then emits a microwave beam, in receive mode the horn collects a microwave beam and concentrates it int the waveguide
