It depends upon the directionality of the antenna. A long-wire will pull in a bucket-full of signals at all frequencies from 2MHz to 6GHz, though there will be nulls in its response at frequencies that correspond to certain multiples of its length. Further, most antennae will be directional, favouring signals in one direction to the detriment of others.
So it's asking a lot of one antenna to do the full range of frequencies.
It sounds as though a textbook on antenna design theory and practical applications would be a good investment.
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"It sounds as though a textbook on antenna design theory and practical applications would be a good investment."
Indeed - I suggest you read a few such books (and design, build, test, and USE some antennas) before attempting to answer questions like this one.
Secondly, for a practical antenna with this bandwidth to be capable of measuring anything useful, you'll need a lot more than one (intro) textbook to figure out how to design & implement it.
the reason you're getting such answers is that the bandwidth you're proposing is extremely wide.
You need to clarify why you need such an antenna:
- what are you trying to measure & why (if that can be made public)
- at what distance
- at what (expected) signal strength
- any other constraining factors
They have one (AA7C) that may pull in all these frequencies but not all at the same time. It may not make your upper end. You have to go thru an adjustment range. If you are willing to use three set ups you can watch this extreme range of frequencies all at once.
They also have a several Pc board antennas (up to 11 gig) but none have anywhere near this range. The PC board antenna are directional. Their part number AA7C is non directional. It is a $40 kit in a 2 1/2 year old catalog. I have bought several kits from them, they were all well made.
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Closed biased minds are utterly impervious to any factual evidence which contradicts their beliefs
Feed each into a MMIC amp selected for that frequency range. (kits available and easy to build...contact me if you need help, but try searching it on your own first)
Now you could basically build three separate detectors or use a mixer to convert them to the scanning portion of your circuit.
Cool ic's developed for cellphone and satellite receiver applications are great for this type of application.
Rf Signal Measurement
Re: Rf Signal Measurement
