Automatic antenna switching circuit using RF switch

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Hi all,
I am very new to the field of RF so excuse me if my post is not the most detailed.

I am tasked with creating a circuit which automatically switches between two antennas. In this case Antenna 1 has precedence, if it is plugged in it should be the priority, Antenna 2 is a back up and should only be switched to when Antenna 2 is not connected. Ideally the circuit should be fully analog.
I was provided with this switch https://www.mouser.co.uk/ProductDetail/Qorvo/QPC7512TR13?qs=GedFDFLaBXGSmuRUCJmdeQ==
But I can ask for another one if it is not the most suitable.

Honestly, I have no idea where to start so any help is appreciated.
Thanks
 

Google "Amateur Radio antenna switch circuit", lots of hits.


Regards, Dana.
 

danadakk said:
Google "Amateur Radio antenna switch circuit", lots of hits.


Regards, Dana.
Click to expand...
Thanks! What I'm finding though seem to be designs for the switch itself whereas I need to automate the switching as I mentioned in the original post.
 

If the decision of switching between the two antennas is taken only at the level of the RF switches, is practically impossible to decide which antenna should be connected. You need extra information, which can be obtain if using mechanical or optical sensors.
If the antennas are used only in TX mode, may be a chance to build a VSWR detector, which can give the information if one of the antenna is not connected, and give the command to switch the RF signal path to the other antenna.
 

If your use a directional coupler to Antenna-1 and if this antenna is not connected, all waves will be reflected so you can use this information to switch between two antennas.If that reflected waves is processed by aid of detector or anyhow, another circuit will activate Anetnna-2.
If the delivered waves' magnitude is too high in case of High Power RF Amplifier, a circulator can be used to protect th PA but if the switching time is too short, it won't be a trouble.
 

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