uhf reception antenna calculations
uhf reception antenna calculations
(OP)
Hi all,
I am working on uhf transmission antenna and I have to modelize a transmission chain.
My problem is as follows:
How can I calculate the intensity variations in the reception antenna with the expressions of electrics and magnetics fields.
The only thing I have found is the relation between captation area and directivity of emission antenna (lambda^2/(4*pi)) which is a power approach.
Thanks
I am working on uhf transmission antenna and I have to modelize a transmission chain.
My problem is as follows:
How can I calculate the intensity variations in the reception antenna with the expressions of electrics and magnetics fields.
The only thing I have found is the relation between captation area and directivity of emission antenna (lambda^2/(4*pi)) which is a power approach.
Thanks
RE: uhf reception antenna calculations
This breaks down if you are not in the far field.
Watch out for the difference between 'directivity' and 'gain'. The difference is loss.
Another answer might be to use NEC software.
Personally, I dislike the idea of "capture area". Although it makes sense for reflectors, it doesn't seem to have any conceptual basis for high gain antennas with small frontal area (such as a long Yagi).
RE: uhf reception antenna calculations
Look at:
http://www.proxim.com/support/all/stratum/technotes/tn2001-08-13a.html
http://rf.rfglobalnet.com/software_modeling/categories/14.htm
RE: uhf reception antenna calculations
Ham radio guys (and women) can help you get a feel of transmission problems if you are working down low in frequency between 1 and 100 Mhz. They have alot of great experience.
kch