Hi
I had both research and industrial experience of more than 6 years in antenna, RF & Microwave circuits and PCB design using Ansys HFSS, CST Microwave Studio, Keysight ADS and AWR Microwave Office, KiCAD and Altium Designer. I have designed various antennas like Microstrip Patch, Rectenna, Vivaldi, Anti-Podal, Printed Monopole, DRAs, Horn, RF & Microwave circuits like Power Amplifiers, LNAs, Mixers, Oscillators, Power Dividers, Oscillators and PCB designs like Buck Boost converters, Power Supplies, nRF boards with integrated PCB antennas.
As I have gone through your description and understood that a phased array antenna or an active antenna must be designed in 868 MHz and 915 MHz ISM frequency band.
You need either
1. Either to find the suitable pre-existing antenna system
2. Or help to design a system.
If you are interested let’s have discussion on freelancer chat box such that I can explain you better about the work and I can also know in depth requirements of the work.
Thanks