Below is a list of a few helpful RF and Microwave links, if you have any more that should be added to the list, let me know in the comments and I'll add it to the list!
IET RF and Microwave Linkedin page - https://www.linkedin.com/groups/3333046
Our Linkedin page for the community
Rohde and Schwartz - https://www.rohde-schwarz.com/uk/home_48230.html
Innovators in all fields of wireless communications
Microwave Journal - http://www.microwavejournal.com/
Source for RF and Microwave technology news, events and educational information
RF GlobalNet - https://www.rfglobalnet.com/
Source of technical information for the RF/microwave design community