Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1974-02-27
1976-03-02
Libman, George H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325383, 325385, 343852, H04B 118, H01Q 150
Patent
active
039421198
ABSTRACT:
An antenna has two output terminals and is operative for receiving electromagnetic radiation and converting the same into electrical signals appearing across the two antenna output terminals. There are provided a first and a second transmission channel, each having a respective input comprised of a pair of input terminals, and respectively operative for transmitting electrical signals having frequencies lying in a predetermined first frequency range and in a predetermined higher second frequency range, one of the input terminals of the first channel being connected to one of the two antenna output terminals. A transformer includes a primary winding connecting the other of the input terminals of the first channel to the other of the two antenna output terminals. The transformer further includes a secondary winding connected across the two input terminals of the second transmission channel. The transformer is operative when the frequency of the electrical signal across the antenna output terminals is in the aforementioned first range for stepping down the input impedance of the second channel as reflected into the circuit of the primary winding to a value lower than the value of the input impedance of said first transmission channel at such frequency.
REFERENCES:
patent: 1976909 (1934-10-01), Amy
patent: 2280461 (1942-04-01), Whisk
patent: 3465344 (1969-09-01), Scott et al.
patent: 3582791 (1971-06-01), Slavin et al.
patent: 3633109 (1972-01-01), Schulz
Flachenecker Gerhard
Landstorfer Fritz
Lindenmeier Heinz
Meinke Hans Heinrich
Hans Kolbe & Co.
Libman George H.
Striker Michael J.
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