During wave propagation in an air-filled rectangular waveguide:1) Wave impedance is never less than the free-space impedance2) Propagation constant is an imaginary number3) TEM mode is possible if the dimensions of the waveguide are properly chosenWhich of the above are correct?

During wave propagation in an air-filled rectangular waveguide:1) Wave

1.	During wave propagation in an air-filled rectangular waveguide:1) Wave impedance is never less than the free-space impedance2) Propagation constant is an imaginary number3) TEM mode is possible if the dimensions of the waveguide are properly chosenWhich of the above are correct?
A.	1 and 2 only
B.	1 and 3 only
C.	2 and 3 only
D.	1, 2, and 3
Answer» B. 1 and 3 only

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During wave propagation in an air-filled rectangular waveguide:1) Wave impedance is never less than the free-space impedance2) Propagation constant is an imaginary number3) TEM mode is possible if the dimensions of the waveguide are properly chosenWhich of the above are correct?

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