EM Waveguiding Overview • Waveguide may refer to any structure that conveys electromagnetic waves between its endpoints • Most common meaning is a hollow metal pipe used to carry radio waves • May be used to transport radiation of a single frequency • Transverse Electric (TE) modes have E ┴ k g (propagation wavevector) • Transverse Magnetic (TM) modes have B ┴ k g • Transverse Electric-Magnetic modes (TEM) have E, B ┴ k g • A cutoff frequency exists, below which no radiation propagates
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EM Waveguiding Overview Waveguide may refer to any structure that conveys electromagnetic waves between its endpoints Most common meaning is a hollow metal.
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EM WaveguidingOverview
• Waveguide may refer to any structure that conveys electromagnetic waves between its endpoints
• Most common meaning is a hollow metal pipe used to carry radio waves• May be used to transport radiation of a single frequency• Transverse Electric (TE) modes have E ┴ kg (propagation wavevector)
• Transverse Magnetic (TM) modes have B ┴ kg
• Transverse Electric-Magnetic modes (TEM) have E, B ┴ kg
• A cutoff frequency exists, below which no radiation propagates
EM WaveguidingElectromagnetic wave reflection by perfect conductor
E┴ can be finite just outside
conducting surface
E|| vanishes just outside and
inside conducting surface
qi qr
EI
ER
z
y
EI||
EI┴
ER┴
ER||
z
y
EI┴ ER┴
- - - - - - -
D┴2 = eoeE ┴2
D┴1 = eo E ┴1
D┴1 = D┴2
z
y
EoI + EoR = 0
E||1 = E||2
EI|| ER||EI|| ER|| EI|| ER||
EoT = 0
EM WaveguidingElectromagnetic wave propagation between conducting plates