Hi everyone!
Not being a specialist in RF design, I'm turning to you for a small question. I'm designing a board with a 2.4Ghz chip (MKW41Z from NXP), and an amplifier. I respected the schematic of the reference design to do so:
I decided to use an antenna, namely, the one in this paper:
https://www.eeweb.com/app-notes/small-form-factor-2-4-ghz-pcb-antennaThis is all well, except that I plan to use OSH park to fab the card, and the stack up is not the same: I've got a 0.17mm dielectric between top and 2nd layer with OSHPark, while the reference design is 0.25mm. FR4 of OSH park is e=3.5, while the reference is 4.5.
So I guess I need to adjust the length and width of the tracks of the antenna, but I don't know how...
Here is the component placement I was settling for, with the routing:
(yellowish plane is the DGND plane right bellow, and don't pay attention to the vias as they are not yet correctly connected)
What do you think? I'm also afraid that the 0402 pads are too big in regards with my track width (12mil for 50R)
Thanks in advance!