3
As with all engineering problems -- that depends.
If you had a nice well-mannered antenna that presents a 50-ohm impedance (or any known, controlled impedance) at its terminals, then you could make a controlled impedance trace with that impedance back to the tranceiver. Then the only thing you'd have to worry about is the leakage from the trace, and the ...
3
Power supplies mostly have these kind of holes. because, some times you need your enclosure to be grounded. So, there's need to sold extra wire on board and body to ground the enclosure.
And via in the hole gives strength to the hole coper so that it may not be peeled-off by screw head.
3
I believe this is a simple case of automatic copper pour following the preset parameters.
Every routing program has "minimal distance" that can be set for traces as well as copper pours. When these meet the pads they cannot just merge with them, because it will create very hard to solder pads due to thermal dissipation. So:
a) copper pour cannot ...
1
You should use flux and low melt solder alloy to make life easy for yourself. Add flux and solder first, clean excess with braid, and then apply hot air to finally solder the connector in place.
Low melt solder is expensive, but you need a very small quantity. Do not use lead free solder as is a high melting point unless you really care about being rohs ...
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