I'm borrowing the RF design from the MICRF114 Development Kit.
Here's user guide- http://ww1.microchip.com/downloads/en/DeviceDoc/50002433A.pdf
The circuit I'm using is on p. 35 and the antenna layout is on p. 21.
The issue I'm facing is that my board can only be 0.8" wide, but the antenna is 25mm (0.98") wide. I don't know enough about antenna theory to know what changes I can make to the antenna dimensions to shrink the width down, but still maintain the correct impedance.
Correct me if I'm wrong, but I think the primary consideration for resizing the antenna should be ensuring that the matching network is dimensioned properly to prevent reflections/losses in power transmission via the antenna.