I have long had the idea to make a microwave radiation indicator, and I finally got down to business.
This is still a declaration of intent.
Of course, portable indicators are made by anyone who is not too lazy.
Unfortunately, marketing tricks do not allow the device to have a wide functionality (connection to a PC, logging) and at the same time be cheap.
The project provides for an easily removable detector part, which can be used autonomously.
In addition, the detector part produces an analog signal of 4-20 mA, which is recorded by many PLC ACS.
How to choose an antenna design? This is a long and painful question. Fortunately, industrial products can provide answers.
I propose to use in the first iteration the logarithmic detector MS2351M of Chinese manufacture, from 0.05-4 GHz. Its parameters are not record-breaking, but with the factory selling price of about $0.3-0.4, you can close your eyes to this... Let me remind you that the detector boards are replaceable...