Build your Own Cantenna

Cantennas make good reference antennas. Their gain is always close to 8.5dBi.

The can must be exactly the right size
for it to work properly. (117 x 100) This is a very
common size and was originally full
of peaches!



Note: You’ll also need a patch lead.

A further extension can be used but we’d recommend a maximum of 5 mtrs and use low loss LMR195 cable.
N30N80-195/200-5000 or N30N85-195/200-5000

For wireless use (802.11 b,g, n) with Netgear, D-Link , which use RP-SMA connectorsN30A60-JBY195-2000  (2 mtres) or N30A60-JBY195-5000  (5 mtres)
(Just type N30A60 into search box) 

For Linksys (who mainly use  RP-TNC connectors)
N30T60-195/200-2000  (2 mtrs) or N30T60-195/200-5000  (5 mtrs)
Just type N30T60 into search box) 

See blog on  connector identification.



Mounting the cantena can be done by screwing the base to a suitable bracket, or drilling a couple of holes
in the base to take a cable tie which can be wrapped around a pole. You can paint the outside and tape cling film or plastic, preferably UV resistant,  over the opening to keep out water. Injecting  foam, such as for use in cavity walls or used in packaging depts into the inner is OK too.


Customer feedbackafter a slight initial hiccup !

I wrote back to Peter say the Cantenna decreased my signal strength. I took it apart as I had noticed that the can was in contact with the “pickup” probe. I widened the hole and now have a constant 10 db impovement over the signal strength without the Cantenna.  Thanks for a cheap, practicle solution, Regards,  Peter Robinson

Note: If you are using the RFShop cantenna kit, the probe is already soldered to the correct length. You’ll just need to drill the holes in a can as in the diagram below:








Field Plot of 2.45GHz Cantenna

The above design was analysed by CST’s MWS program. Plot below is courtesy of CST.





3.5 GHz Cantennas











5.8 GHz Cantennas



Typical VSWR Plot of 5.8 GHz Cantenna














Posted By

Peter Martin