CFA Antenna
I have obtained a copy of the patent spec for this invention. From a patent
spec someone skilled in the art ought to be able to make a CFA without
assistance from the inventor.
You might think so. I was recently engaged as an expert witness in a
case of a patent infringment involving a radio circuit involving
filters. The patent write up was, in the main, technical gibberish.
Most of my efforts went into trying to make sense of it.
It rather dented my faith in the patent procedures
Having read the spec I have come to two conclusions:
1) I am not skilled in the art
2) the First Law of Engineering applies (any useful advance has at least one
major disadvantage). In this case I wonder if, as we make the CFA a smaller and
smaller fraction of a wavelength, it becomes more and more difficult to
maintain the correct relative phasing and amplitude of the two feeds?
Try to get hold of the Wireless World article "CFA-RIP"
The best patent I have read is the one by James F Corum on his toroid
antenna, which appears to have been written very skillfully. It
covers almost every concevable configuration of the antenna but
leaves out something essential, which in this case is the feedline
impedance matching network. This means that you cannot easily
reproduce it from the patent write-up.
--
Regards, Peter, G3LDO
<[email protected]>
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