The 75um trace it will work fine at +10dBm RF power, but I think this width is very unusual for a normal PCB trace.
The parasitic inductance of the 20mm trace will be pretty high (about 20nH), and you have to compensate somehow using a matching capacitors. Have to put all the inputs in a CAD simulator and see what you get.
If it's actually 50 ohm impedance (80 µm FR4 substrate?), it has no parasitic inductance. Just higher resistive losses according to the small width, but no problem with 20 mm length.
In fact this is the problem. For a 75um microstrip line put on a very thin substrate, will be very hard to keep the 50 ohms impedance. I understand this is a normal PCB design, and not an LTCC or IC project.
The microstrip line with a length that is 285 times longer than its width, for sure will have some parasitic inductance that needs to be compensated.
A properly terminated (with a resistor) signal line does not need a capacitor. There is nothing to compensate.Read my first post about "matching capacitors".
I agree.that this single-ended microstrip line doesn't have the desired impedance of 50 ohms
I agree, too. But antenna is something different...matching capacitors could be integrated into antenna matching network.
If happen that this single-ended microstrip line doesn't have the desired impedance of 50 ohms (most likely at given data), the easiest way to bring the circuit to 50 ohms is to use matching capacitors at the ends of the line.
Yes, compensation elements may be used.
There's however no reason why the designed impedance would be "most likely" missed. Particularly it's not systematically too inductive, as suggested in previous posts.
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