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A waveguide of rectangular cross-section

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A waveguide of rectangular cross-section
width a=4 cm length b=5 cm
in which microwave signals of frequency f propagate solely in the TE10 mode.

There are limits on the frequencies of microwaves that can propagate. For very high frequencies in which landa (?) is much smaller than both a and b, many modes exist that can carry energy. Such modes do not exist when lamda(?) exceeds twice the dimension which is orthogonal to the field E.

i.e. no mode when (lamda)?> 2b (the short direction)
or when (lamda) ? >2a

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A waveguide of rectangular cross section is examined.

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