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What is difference between Rectangular Waveguide and Circular Waveguide?
circular is easy to manufacture than rectangular As the name indicates the circular is circular in shape and rectangular is rectangular in shape its uses same modes that is Te and Tm I know this much only hope this helped u little bit atleast A: In principle waveguides act as the equivalent of wires for high frequency circuits. For such applications, it is desired to operate waveguides with only one mode propagating inside of the waveguide. With rectangular waveguides, it is possible to design the waveguide such that the frequency band over which only one mode propagates is as high as 2:1 (i.e. the ratio of the upper band edge to lower band edge is 2). With circular waveguides, the highest possible band width allowing only a single mode to propagate is only 1.3601:1. I found it on Wikileaks.
Why TEM waves cannot propagate in a wavwguide?
In a waveguide, transverse electromagnetic (TEM) waves cannot propagate because they require both electric and magnetic field components to be present and perpendicular to the direction of propagation. In a waveguide, the fields are constrained to be transverse to the direction of propagation, which is not possible for a pure TEM wave.
Why TEM wave is not supported by hollow waveguide?
Arif Ullah khan utman kheel this is because for conductor E parallel is zero this means that the surface of the wave guide is at equipotential and this potential follow the laplace equation .it means that there is no maxima and minima inside the wave guide . this means that the electric field inside zero . hence the TEM do not exist in wave guide only TE and TM can be exist . if we place some conductor in the wave guide then the conductor inside will not be equipotential and the TEM waves can be exist . like in Coaxial cables
What is TE and TM modes?
Transverse electromagnetic (TEM) is a mode of propagation where the electric and magnetic field lines are all restricted to directions normal (transverse) to the direction of propagation. Plane waves are TEM, however, we are more interested in what types of transmission lines can support TEM.
The waves which cannot be transmitted in waveguide are?
The waves that cannot be transmitted in a waveguide are those that have a wavelength longer than the cutoff wavelength of the waveguide. These waves are unable to propagate efficiently within the waveguide due to the cutoff phenomenon which restricts their transmission.
What is the dominant mode of microstrip line?
The line will not support a true TEM wave; at non-zero frequencies, both the E and H fields will have longitudinal components (a hybrid mode).The longitudinal components are small however, and so the dominant mode is referred to as quasi-TEM. kuldeep jaimini
Why TEM wave cannot propagate thorough a rectangular waveguide?
TEM modes (Transverse ElectroMagnetic) have no electric nor magnetic field in the direction of propagation. In hollow waveguides (single conductor), TEM waves are not possible, since Maxwell's Equations will give that the electric field must then have zero divergence and zero curl and be equal to zero at boundaries, resulting in a zero field. BY JITONJA GOGO at THE UNIVERSITY OF DODOMA
What is the dissimilarity between waveguide and transmission line?
i am kuldeep b. shukla.this is my ans: Comparison of Waveguide and Transmission Line Characteristics Transmission line • Two or more conductors s eparated by some insulating medium (two-wi r e, coaxi al , microstrip, etc.). • Normal ope rating mode is the TEM or quasi-TEM mode (can support TE and TM modes but the s e mode s a r e ty pic a l l y undesirable). • No cutoff frequency for the TEM mode. Transmission lines can transmit signals from DC up to high frequency. • Significant signal attenuation at h i g h f re q u e n cies d u e t o conductor and dielectric losses. • Small cross-section transmission lines (like coaxial cables) can only transmit low power levels due to the relatively high fields concentrated at specific locations within the device (field levels are limited by dielectric breakdown). • Large cross-section transmission lines (like power transmission lines) can transmit high power levels. Waveguide 1. Metal waveguides are typically one enclosed conductor filled with an insulating medium (rectangular, circular) while a dielectric waveguide consists of multiple dielectrics. 2.Ope rating modes are TE or TM modes (cannot support a TEM mode). 3. Must operate the waveguide at a frequency above the respective TE or TM mode cutoff frequency for that mode to propagate. 4. Lowe r signal attenuation a t high frequencies than transmission lines. 5. Metal waveguides can transmit high powe r levels. The fields of the propagating wave are spread more uniformly over a larger cross-se ctional area than the small cross-section transmission line. 6. L arg e cro ss-sectio n (lo w f r e quency) wavegui de s a r e impractical due to large size and high cost.
Why microemulsions are analyzed by TEM not by SEM?
Microemulsions are analysed in SEM in cryogenic mode. In that mode it is difficult to get a resolution of order of 40-50 nm(which is the typical domain size of microemulsions). So TEM is a better option
Which wave cannot exist inside wave guide?
TEM TE modes (Transverse Electric) have no electric field in the direction of propagation. * TM modes (Transverse Magnetic) have no magnetic field in the direction of propagation. * TEM modes (Transverse ElectroMagnetic) have no electric nor magnetic field in the direction of propagation. * Hybrid modes are those which have both electric and magnetic field components in the direction of propagation
Why TEM mode does not exist in waveguide?
for TEM u need to a magnetic field (H) linked to an electric field .for this u need to a J relative to E (E=sigma J). because [curl H = J] but optical fiber is dielectric wave guide and sigma is zero and u only have dD/dt so there isn't H linked to E.
What is the dominant mode of propagation in microstrip line in low frequency approximation?
quasi-TEM
