Question
What matching system uses a short length of transmission line connected in parallel with the feed line at or near the feed point?
Answer Options
- A) Gamma match
- B) Delta match
- C) T-match
- D) Stub match
Correct Answer: D
Explanation
Impedance matching often requires canceling out the reactive component of the antenna’s impedance to achieve a purely resistive load. This reactive cancellation can be achieved using a small length of transmission line that is either open or short-circuited at the end.
A Stub match is the matching system that uses a short length of transmission line connected in parallel with the feed line at or near the feed point. The stub’s length and termination (open or short) are chosen to provide a net shunt reactance that is equal and opposite to the antenna’s feed point reactance, effectively cancelling it and making the impedance resistive.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!