Qualcomm Microwave Engineering Quiz-1

Circuit theory assumes physical dimensions of the network smaller than electrical wavelength, while transmission lines may be considerable fraction of wavelength

Since no lumped elements like resistors, capacitors are used at microwave frequencies, only transmission lines are used. Hence they are called distributed parameter network.

Explanation: With a single conductor, transverse electromagnetic wave propagation is not possible. Hence we need a minimum of 2 conductors.

Explanation: In the lumped element circuit model of a transmission line, we use only resistor, capacitor and inductor. Hence no transistor is used.

Z=R+jωL. Hence, both resistor and inductor contribute to the impedance of the transmission line.

Characteristic impedance is defined as that impedance of a line which is a constant when measured at any point on the line, Hence B.

Since propagation constant is a complex value, containing attenuation constant α, phase constant β respectively as their real and imaginary parts.

α is the real value of propagation constant, also signifies the loss that the transmission line causes and hence the total amount of energy transmitted. Hence all the mentioned.

Propagation constant is a complex sum of α and β, α being the real value and β being the complex part.

Characteristic impedance Zₒ is the square root of ratio of impedance and admittance of the transmission line.