Telecommunications – Carrier wave repeater or relay system – Two separate way transmission
Patent
1993-07-15
1994-11-29
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
Two separate way transmission
455 17, 455 24, 455 79, H04B 714
Patent
active
053697820
ABSTRACT:
A radio relay system including a water-proof conductor housing on which is located a pair of antennas, one antenna being used for transmitting and receiving radio carrier wave signals of a first and a second frequency, respectively, while the other antenna is used for transmitting and receiving radio carrier wave signals of a third and a fourth frequency, respectively. A skirt for each of the antennas is located adjacent the antennas on the housing, one skirt has a length equal to a quarter of the wavelength of the first frequency while the other skirt has a length equal to a quarter wavelength of the third frequency. A relay circuit is located in the housing which includes circuitry for extracting and combining a portion of the radio carrier wave signals of the first and the third frequencies respectively radiated from the two antennas with the radio carrier wave signals of the first and third frequencies respectively received by the opposite antenna of the pair of antennas for cancelling unwanted local interference therebetween.
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Ishizaki Yasuhiro
Kawano Minori
Komatsu Fumiaki
Kuroda Eiichi
Kuroiwa Hiroyuki
Eisenzopf Reinhard J.
Faile Andrew
Mitsubishi Denki & Kabushiki Kaisha
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