Communications: radio wave antennas – Antennas – Plural diverse-type antennas using same active element
Patent
1981-05-11
1983-05-03
Lieberman, Eli
Communications: radio wave antennas
Antennas
Plural diverse-type antennas using same active element
343740, 343844, 343846, H01Q 501
Patent
active
043822606
ABSTRACT:
The two channel transmit only antenna includes a balanced antenna and a ground plane disposed between the two radiators of the balanced antenna. The two radiators are fed by a three wire arrangement having one conductor connected to ground and the ground plane and two conductors each connected to a different one of the two radiators. A first channel filter is coupled between a first source providing a first transmit signal in a first frequency channel and one of the two conductors and a second filter is coupled between a second source providing a second transmit signal in a second frequency channel and the other of the two conductors. At least one resistor is connected between the two radiators. The two radiators are excited by an associated one of the two transmit signals having the same potential and the two radiators and the ground plane provide two monopole antennas back to back for independent transmission of the first and second transmit signals while the two radiators operate in a dipole mode in response to received signals to isolate the first and second sources from the received signals. The channel filters also assist in the isolation of the received signals from the source of transmitted signals, suppress transmitter current flow in the resistor, and block the transmitter current flow between the first and second channels.
REFERENCES:
patent: 3789412 (1974-01-01), Keenan et al.
Hill Alfred C.
International Telephone and Telegraph Corporation
Lieberman Eli
O'Halloran John T.
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