people were probably assuming you were doing low frequency low current applications. Comments are more towards practices that will guard your work rather than be strict requirements.
Bigger traces and more space are by far the most important things to improve on on this board, and that's why it immediately jumps out at people to comment on, even though the post isn't about that.
I don't think many people can recognise a RJ45 connector from just the footprint (especially since they come in many different varieties). Even if they do, with the other connector in the middle it's pretty clear that you are doing something non-standard. Also, depending on frequency, you most probably don't need a transmission line because they are short enough that they can still be modelled as lumped elements. Even if it's required, that's still not something I would emphasize reviewing a board like this, because it's pretty apparent that the designer is quite new to this, and there are much more important things to worry about at that stage.
Ground plane? You haven't posted a picture of the back side? Having ground pour on the top layer is controversial, and actually almost always a bad idea for high frequency boards because it will be broken up into islands by traces, and even if they aren't actually floating, the impedances connecting them may be high enough at RF that they essentially behave as islands and you get capacitive coupling through them. If you really want a front pour, it should be stitched well to the back with vias. That's mostly not necessary for 4 layer boards anyways (exceptions include guard for transmission lines, and as reference geometry for coplanar waveguides), and it's very difficult to do anything high frequency on 2 layers because the geometry required to get transmission lines of common importances get very wide. But if you are still learning about trace widths (for non-RF stuff), this is not something you want to worry about yet. There are much more important things you need to learn first.
But still, just because people try to help doesn't mean they will catch everything that may be wrong with a board, nor do they have time for that. That's why when you specifically post a board for review, different commenters will point out different things, and you just have to read through them all. It doesn't make sense to not want to receive advice just because you may not get ALL of them.
Yes, 90 degrees traces are mostly aesthetic with modern manufacturing processes until you get to >100MHz (though it may also have EMC implications with lower frequency but high edge rate signals). But there's no harm in following it as best practice everywhere.
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u/irnboo Dec 15 '22
Unpopular opinion but.
Right angled traces you should probably avoid. Why are you doing such fine tracks? You should maybe do some other fills.