Hi guys

I am testing an LoRa module from Microchip(RN2903):
http://ww1.microchip.com/downloads/en/DeviceDoc/50002390C.pdf

On page 12, it says:
The supporting board must be 84 mm long and 53 mm wide in order to generate that impedance and the average gain of 1.3 dB

But I can only allow for 64mm x 48 mm, is there any tips and tricks to make the ground plane bigger within these restriction?

Thanks guys!

PS: it also doesn't mention where to attache the antenna. On the long edge or short edge? Please let me know if anyone knows, cheers

 

It also says:
Modular certification of the RN2903 module is
performed with the PCB trace antenna as shown in
Figure 5-3. The exact dimensions of the trace antenna
must be followed.