Posted by: G. L. Charvat | on November 3, 2012
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any suggestions on the ideal material of the can? would wrapping the inside of the can with aluminum foil or another metal be helpful? thanks
Good question, it should not matter if you are operating at 2.4 GHz.
Greg is correct that the type of metal is not important for the antenna operation (pattern, gain, and polarization). But it is important when decided on how to connect the coaxial cable. Here is one design that uses a Pringles can. http://www.oreillynet.com/etel/blog/2001/07/antenna_on_the_cheap_er_chip.html
I think Greg’s design calls for a bulkhead SMA connector and a Tin plated can. So you just solder the connector to the can which makes a good electrical and mechanical connection. Larger connectors and other metals can be connected with fasteners. But if you use a cardboard can that has an aluminum foil lining then it will be difficult to make a good connection. The above site ignores the electrical connection and uses epoxy to strengthen the joint. This may be “good enough” for a communications type application, but the reduced isolation may be noticeable in the radar application.
Digi-Key no longer carries the MAX414CPD opamp. Neither does Mouser or Jameco. Is there a substitute or other source?
I found the chip at alibi.
I ordered some at ebay from the UK, http://www.ebay.co.uk/itm/MAX414-Maxim-28MHz-Quad-Low-Noise-Precision-Op-Amps-/120714035522
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