Question

Which of the following is the disadvantage of Microstrip line feeding?

(a) Spurious feed radiation increases with increase in substrate thickness

(b) Spurious feed radiation decreases with increase in substrate thickness

(c) There is no Bandwidth limit

(d) Low spurious radiation

The question was posed to me in a job interview.

My question comes from Feed Methods topic in division Slot & Microstrip Antenna of Antennas

Answer 1

Correct choice is (a) Spurious feed radiation increases with increase in substrate thickness

For explanation: Microstrip line feed acts as an extent to patch and is connected to patch just like a conducting strip. So the substrate thickness may increases leading to the increase in spurious radiation and this limits the bandwidth.