Some of our customers have asked for an example on how it intergrate the Johanson Chip antenna diretly into their own PCB designs, now that we have moved away from a integrated chip antenna on the SRF (it's all because the overall performance is related to how well the host PCB is impedance matched, some people got great range others got poor range)....ever wished the laws of physics would bend? :)
I have just updated the Eagle Cad design for the SRF Shield and the XinoRF with our latest version, which shows using the SRF and chip antenna in one pcb.
I've also produced a very baisc example of the new RFµ footprint using the same chip antenna, you'll notice the few parts before the chip antenna, these are to impedance match the antenna to the SRF, I'll publish the parts values once I get a PCB to test out from Ragworm.
We are currently working on the documentation to accompany this so there'll be much more data to come but I wanted to help those who wanted an example footprint as soon as possible.
I always start with a single 0 ohm resistor and then use the VNA (posh test kit) to help me tune the design to it's optimum performance, I suggest you start with a 0 ohm also
BTW: An 8.2cm wire connected to pad 1 usually gives good dependable performance and is a good thing to compare a chip design against using the RSSI test modes of ATNT3 & 4.