I am trying to build a Butterworth bandpass from 130MHz to 140MHz (approx.). As I have already worked with microstrip lines of transmision, I wanted to give coplanar waveguides a try, as in the future I plan to work with higher frequencies (>10GHz) and I have been told that in those cases they behave more efficiently.
My coplanar waveguide is a feed line of 2mm spaced 0.49mm to ground. The board will be 1.6mm thick and use FR4 dielectric (relative permitivity of around 4.6). The expected impedance is 50 ohms.
As of now, I have finished designing my PCB, but I have two main doubts:
Can those soft curves on the upper ground plane, that KiCad adds automatically around the pads of the capacitors, affect the behavior of the waveguide?
Have I added too many vias around the signal line? And are there enough vias all over the rest of the board? I am a bit lost about vias.
Thank you in advance!
Edit 1: Thank you for the comments and answer, I have edited my design to this new PCB:
Edit 2: Thank you again for the information. This is the latest design. As I read here, it is necessary to add lots of small vias nexT to the main trace very close together. However, there is very little information about this on the internet, I cannot find any exact number/density of vias, their size or how far from the trace should thEy be.