CAD CAD Antenna Designer Feed Networks and Impedance Matching 2

Question 1

On a Smith Chart, where is a perfect impedance match (Z = Z0) located?

Accepted Answer

At the center of the chart

Answer

At the far right edge of the chart

Answer

At the far left edge of the chart

Answer

At the top of the chart

Question 2

What is the input impedance of a lossless transmission line terminated in a short circuit (Z_L = 0) and exactly λ/4 long?

Accepted Answer

Infinite (open circuit)

Answer

Zero (short circuit)

Answer

Equal to the characteristic impedance Z0

Answer

Equal to twice Z0

Question 3

What is the approximate return loss for a system with a VSWR of 2:1?

Accepted Answer

−9.5 dB

Answer

−3.0 dB

Answer

−6.0 dB

Answer

−20.0 dB

Question 4

What is a Wilkinson power divider primarily designed to achieve?

Accepted Answer

Equal power splitting with high isolation between output ports

Answer

Unequal power splitting for beam steering applications

Answer

Impedance transformation between balanced and unbalanced lines

Answer

Frequency diplexing for dual-band operation

Question 5

What happens to the electrical length of a transmission line when the operating frequency is doubled?

Accepted Answer

The electrical length is doubled

Answer

The electrical length is halved

Answer

The electrical length remains the same

Answer

The electrical length quadruples

Question 6

In a T-junction power divider, what is the primary disadvantage compared to a Wilkinson divider?

Accepted Answer

T-junctions provide no isolation between output ports

Answer

T-junctions cannot split power equally

Answer

T-junctions require resistive terminations that dissipate signal power

Answer

T-junctions can only be used below 1 GHz

Question 7

What does the outermost scale of a Smith Chart typically represent?

Accepted Answer

Wavelengths toward generator or toward load

Answer

Reflection coefficient magnitude

Answer

Normalized resistance values

Answer

Frequency in GHz