A stub of length 0.12 is used to match a 60- lossless line to a load. If

Question:

A stub of length 0.12λ is used to match a 60-Ω lossless line to a load. If the stub is located at 0.3λ from the load, calculate
(a) The load impedance ZL
(b) The length of an alternative stub and its location with respect to the load
(c) The standing wave ratio between the stub and the load