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TEM wave vs quasi TEM wave

This page compares TEM wave vs quasi TEM wave and describes difference between TEM wave and quasi TEM wave.


TEM wave referred as Transverse electromagnetic wave. In this mode, electric field and magnetic field are perpendicular to each other and perpendicular to the direction of propagation. This mode exists in a structure having two excited conductors surrounded by dielectric material. One of the example is coaxial cable as shown in the figure below. In which E field is in radial direction, H field is around in the form of concentric circles and direction of propagation is in the length of the cable.


TEM wave in coaxial cable

Quasi TEM wave mode exist in a microstrip line. The term quasi refers that this wave is resembling to TEM wave. As we know in microstrip top and bottom is conductor part and middle one is dielectric. Hence in microstrip, wave propagates through the air above the top pattern and through the dielectric substrate. Due to this two different mediums having different resistivities wave propagates with different speeds in both the regions. This is referred as quasi TEM mode.

WAVEGUIDE RELATED LINKS

RF Switch basics and applications along with manufacturers of RF switch refer following link:
RF Switch

For types of waveguide viz. rectangular & circular, waveguide propagation modes, impedance matching of waveguide read following waveguide tutorial.
waveguide basics tutorial

Manufacturers of waveguide components such as waveguide to coaxial adapter, coupler, flanges, gasket, tees, termination, shorts, isolator, circulator, horn antenna, attenuator, feed-thrus, bends, loads, twists, straights, pressure windows, transformers, sliding short circuits, fixed short circuits, sliding mismatches etc. visit following link.
Waveguide components manufacturer

Rectangular waveguide dimensions as per USA standard including frequency, broad dimension and narrow dimensions, visit following link.
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This article describes microstrip line basics and mention types of microstrip lines and their advantages. READ MORE.

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