A very high low noise antenna
Posted: Mon Jul 22, 2019 2:41 pm
I have been following this forum for some time because I am interested in noise and antenna noise reduction technical and have found many interesting articles here. Especially the miniwhip and the special low noise whip described here are very interesting because they give good performance in small size so big antennas requiring a lot of space are not required any more. This is important because with sdr or other pencil type receivers it is possible to have miniature systems that can go anywhere. I think that all the posts here do not consider capacitance tap antennas that have been researched intensively in the last times. Yes, the conventional PA0rdt can be conceived like a capacitive tap capturing the electric field of the free space, but following the recent works of many scientists I have found it is possible to capture signals with general capacitive coupling, see for example the works of prof. Y.Zrhforooshand A.Siahcheshm of Azad University, Iran: one of the articles is: ULTRA WIDEBAND MONOPOLE ANTENNA BY A CAPACJTIVE COUPLING FEED WITH DOUBLE BAND NOTCH FUNCTION.
Here we have the concepts of small size, low noise, ULTRA wide bandwidth all obtained by the novel idea of the capacitive coupling conception. In fact it is very strange that, since the invention of the radio, attention was always concentrated on very big antennas, therefore mostly inductive, and little or no attention was concentrated on its analogue, or capacitive. As far as I know, only a German Scientist, during the second world war, Dr. Von Blumenthal (see "directory of deported German scientific personnel" - Springer & Verlach - Berlin - 1981) was pioneering this novel concept. He was an assistant, in early years, of distinguished Russian Dr. Popoff, by many believed to be the real inventor of radio. I could now mention Tesla, the genius, but we would digress too far.
I now wish to describe here my experiments and results with integrated Capacitive coupling in the course of next articles, but I invite others to share they experience if they also read and thought about novel antenna tecnics.
Here we have the concepts of small size, low noise, ULTRA wide bandwidth all obtained by the novel idea of the capacitive coupling conception. In fact it is very strange that, since the invention of the radio, attention was always concentrated on very big antennas, therefore mostly inductive, and little or no attention was concentrated on its analogue, or capacitive. As far as I know, only a German Scientist, during the second world war, Dr. Von Blumenthal (see "directory of deported German scientific personnel" - Springer & Verlach - Berlin - 1981) was pioneering this novel concept. He was an assistant, in early years, of distinguished Russian Dr. Popoff, by many believed to be the real inventor of radio. I could now mention Tesla, the genius, but we would digress too far.
I now wish to describe here my experiments and results with integrated Capacitive coupling in the course of next articles, but I invite others to share they experience if they also read and thought about novel antenna tecnics.