Antenna RF track width
Posted: Mon Dec 14, 2015 4:17 pm
Hello,
I have seen the track for the RF in the EVB is pretty thick for being surrounded by copper on th top layer. Let me explain this in detail:
- The RF Track width (calculated as a microstrip line) in a standard PCB should be about 2,57 mm thick for maintaining the 50 ohm at these frequencies. This thicknessis more or less the thickness you use in the EVB, but I have seen you also have coper around the track, which, I think, affects the impedance.
- Then, I have used a CoPlanar Waveguide (CPW) strucutre with ground, which is more similar to the real structure in the EVB and the calculted thickness is smaller.
My question is: which structure should I use for the calculation of the RF track width? simple microstrip line or CPW with bottom ground?
Do you have any application note/guide Line about the PCB layout of the RF pin and track?
Regards, Ramon.
I have seen the track for the RF in the EVB is pretty thick for being surrounded by copper on th top layer. Let me explain this in detail:
- The RF Track width (calculated as a microstrip line) in a standard PCB should be about 2,57 mm thick for maintaining the 50 ohm at these frequencies. This thicknessis more or less the thickness you use in the EVB, but I have seen you also have coper around the track, which, I think, affects the impedance.
- Then, I have used a CoPlanar Waveguide (CPW) strucutre with ground, which is more similar to the real structure in the EVB and the calculted thickness is smaller.
My question is: which structure should I use for the calculation of the RF track width? simple microstrip line or CPW with bottom ground?
Do you have any application note/guide Line about the PCB layout of the RF pin and track?
Regards, Ramon.