Page 216 - Satellite Communications, Fourth Edition

196 Chapter Six

(see Chang, 1989). Calculate the characteristic impedance for a microstrip line
of width 0.7 mm, on an alumina dielectric of thickness 0.7 mm. The dielectric
constant is 9.7.
6.37. For the microstripline of Prob. 6.36, calculate (a) the line wavelength (b)
the phase shift coefficient in rad/m, and in degrees/cm. The frequency of
operation is 10 GHz.

6.38. The dielectric constant of polyguide dielectric is 2.32. Calculate the
characteristic impedance and phase shift coefficient for a microstrip line of
width 2.45 mm, and dielectric thickness 1.58 mm.

6.39. The effective dielectric constant for a microstripline is 1.91. Design a
switched-line phase shifter (see Fig. 6.35) to produce a phase shift of 22.5° at
a frequency of 12 GHz. Show how switching might be achieved using PIN
diodes.
6.40. Calculate the power required to drive a MEM switch, which has to
operate at a frequency of 8 kHz. The switch capacitance is 0.5 pF, and the drive
voltage needed for switching is 75 V. (Hint: The energy stored in a capacitor is
2
1/2 CV and power is J/s.)

References

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