QUESTION THREE (a) Outline the main constructional differences between microstrip and stripline transmission lines used at microwave frequencies. Explain why these devices are preferred in microwave integrated circuits over coaxial transmission lines. What is the most common dielectric used in constructing microstrip and stripline devices What is its relative dielectric constant? A single-conductor microstrip has the following parameters: Width of the Conducting strip, b=0.25 cm Thickness of the conducting strip, c= 0.15 cm Height of the conducting strip above the bottom ground plane, h= 0.35 cm If this microstrip is to be fabricated into a transmission line with capacitance of 12 pF, what is the value of the inductance? Use a diagram to show how a microstrip could be used to simulate a series LC circuit. QUESTION FOUR (a) Explain a common problem that usually occurs at joints or flanges between two waveguide sections. (b) With the aid of sketched diagrams explain how a VSWR test could be performed to locate faults on a microwave link using a power meter, and power couplers connected to a signal generator and a dummy load ZL. (c) State the precautions taken to ensure accuracy of the results. (d) If the measured VSWR is 6.56 and the reflected power is 0.75 W, what is the incident power?