how many types of liquid which used to remove copper which is unused area from pcb? (what is the best liquid and how much does it cost?)
What are the material you use to attached to copper for use area which can be seen as transmission line , open stub, short stub, etc.
If you're laying out microwave PCB structures like transmission lines, microstrip caps, stubs, etc, manual etching may not get good accuracy in the final dimensions. At higher frequencies, dimensional differences of a couple of mils (under-etch or over-etch) can give significant impact on the signal response.
Mr Emad Alnasser has nicely depicted the process. I strongly recommend not to go for manual process. At microwave frequency, micro level accuracy is essential which is not possible through manual process
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