Question

Let's consider a rectangular wave guide with dimensions of ? = 1.58 cm and ? = 0.79 cm, filled with air inside and copper outside.

a) Calculate the cutoff frequency for the first three advancing modes. Specify the name of the

dominant (basic) mode.

b) Draw roughly the electric field and magnetic field lines in the waveguide sections (sections taken from the xy, yz and xz planes) for the basic mode. For drawing, consider that the waveguide extends in the z direction, its long edge on the x axis and its short edge on the y axis.

c) When a signal with a frequency of 7 GHz enters this waveguide,

explain its behavior by considering its propagation constant.

d) ? = number of waves (calculate for the frequency of 10 GHz.)

e) (?) phase constant (Calculate for the frequency of 10 GHz.)

f) (??) wavelength in the guide (Calculate for the frequency of 10 GHz.)

g) (??) phase speed (Calculate for the frequency of 10 GHz.)

i) Find the weakening of 1m in Np/m and dB/m. (In the calculations, you can get the surface resistance of the copper element Rs = 0.026(ohm) for 10 GHz.) (Calculate for the frequency of 10 GHz.)

Answer 1