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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.

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Why tem mode is not support in rectangular waveguide?

The transverse electromagnetic (TEM) mode cannot propagate in a rectangular waveguide because it requires both electric and magnetic fields to have no component in the direction of propagation. In a rectangular waveguide, the boundary conditions imposed by the walls necessitate that at least one field component must be longitudinal (along the direction of propagation) for any mode to exist. Thus, only transverse modes (TE and TM) can propagate, as they support fields that are entirely transverse to the direction of wave travel.


Does tm10 mode of waveguide exist?

No it does not. The least mode for TM modes is the TM11 mode.


Why TM01 mode does not exist in rectangular waveguide?

if any of the m or n in case of TM MODE becomes zero then all the field components vanishes. Hence the waveguide has no relevence with TM01, TM10 or TM00 modes. Therefore TM11 is the lowest order mode of all TMmn modes. For similer reasons TE00 mode can not propagate through the waveguide.


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


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.


What is the dominant mode in rectangular waveguide?

Rectangular Waveguide - TE10; (TM11 in case of TM waves) Circular Waveguide - TE11;


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


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


What mode is less attenuation in circular waveguide?

TE10


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 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


What is ratio of area of circular waveguide to rectangular waveguide having same dominant mode cutoff frequency?

The ratio of the area of a circular waveguide to that of a rectangular waveguide with the same dominant mode cutoff frequency can be derived from the relationship between their dimensions and the cutoff frequency. For the dominant mode (TE11 for circular and TE10 for rectangular), the cutoff frequency depends on the waveguide's geometry. Generally, the area of the circular waveguide is greater than that of the rectangular waveguide when both are designed to support the same cutoff frequency. Specifically, the area ratio can be expressed as ( A_{\text{circle}} / A_{\text{rectangle}} = \frac{\pi a^2}{ab} ) where ( a ) is the radius of the circular waveguide and ( b ) is the width of the rectangular waveguide, leading to a ratio dependent on their respective dimensions.