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Microwave Communication - Engineering

Q1:

In high frequency circuits impedance matching can be done by
  1. open circuited stubs
  2. short circuited stubs
  3. transformer
Which of the above correct?

A 1, 2 and 3

B 1 and 2 only

C 1 and 3 only

D 2 and 3 only

ANS:A - 1, 2 and 3

All the three can be used for impedance matching in high frequency circuits.