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Waveguide - attenuation of power

  • Thread starter Anabelle37
  • Start date
  • #1
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Homework Statement



Show from general considerations that the attenuation of power in the rectangular waveguide (TE10 mode propagating in z-direction) is:
P(z)=P(0)exp(-2k''z)
where k'' is the imaginary part of the wavevector in the phasor exp(j(wt-kz))

Homework Equations



power is proportional to the square of the amplitude


The Attempt at a Solution



tried squaring the phasor and setting k=k'+k''j but did not get right answer.
Please help!
 

Answers and Replies

  • #2
olivermsun
Science Advisor
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What happens when j and j meet in the exponential?
 
  • #3
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think there is a typo in the question it should be P(z)=P(0)exp(2k''z).

after squaring the phasor I get: P(z) = exp(2j(wt-k'z))exp(2k''z)

then i don't know what to do to get in right form.
 

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