Let’s try this again. I find that calling other people names doesn’t actually improve me as an engineer and doesn’t help me to learn something new. So, I will make an attempt to consider actual data. If you choose to add to the discussion, do so with data, not just by speaking in generalities and regurgitating stuff from other forums and websites.
I personally don’t like to generalize. In many cases (see how I didn’t say always )there will be an exception to most of the rules. Or the rule might not be applicable. I think the case about right angle RF tracks follows the suite. There is a camp that will argue that having a right angle track turn makes absolutely no difference. I’m sure there are many cases when that is true. Is it a universal rule? Are there cases when having a right angle track would completely change your circuit tuning? Let’s see if we can come up with one.
Ok, suppose you have an RF device with an output impedance of 50-j415 Ohms and we need to match it to a 50 Ohm load. Let’s say it is a RF amplifier connected to an antenna. And let’s say we are operating at 10Ghz.
To match that you would simply need to connect a 6.6nH inductor in series to have a pretty decent match.
Now, suppose we make a single right angle turn in the trace after the matching inductor. According to the formula discussed in the article, parasitic shunt capacitance would be 0.012fF that’s 12 *10^-18! That’s a really small number! Let’s see how it affects our impedance with the same matching.
That doesn’t look like a perfect match to me. Not even close! Our final impedance is 28.9 + j98 Ohms. What does it mean? It means that your VSWR in that circuit will be around 8.8:1 and you return loss around 1.98dB. That means that 63% of the RF power is going to be reflected from the antenna instead of being radiated! That seems like a big problem to me.
Now I can just as easily come up with a case when by varying initial conditions a single right angle turn will have absolutely negligible effect.
What does it all mean? It means that more often than not the right answer to a complex problem would be “It depends” . Things pertaining to science are not established by a majority vote or by the size of the camp that supports your point of view.