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In an example in Pozar's Microwave Engineering, a conjugate matching circuit for maximum gain is designed using Smith chart. In the shown Smith chart, the matching circuit for input is designed. We locate \$\Gamma_{source}\$ on the Smith chart, convert it to admittance, then move backwards (towards the load) till we reach 1+jb circle. My question is why do we move backwards ? Thanks in advance.
Consider microwave amplifier basic design,
and compare this with your cicuit,
If you look from the transistor input port towards left then Z0 it will be treated as load side. Then you convert Γsource to admittance and use open circuit stub.
You rotate backwards because you move away from the impedance mismatch. You will rotate until the admittance is 1 and the stub is used to cancel the complex component.
Actually, you move towards source, not load.
