Method and apparatus for combining carrier signals

Details Method and apparatus for combining carrier signals Method and apparatus for combining carrier signals

1997-11-25

2000-07-04

Vu, Huy D.

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via frequency channels

455103, H04J 100

Patent

active

060848901

ABSTRACT:
A method and apparatus of combining carrier signals (110, 111) includes in a coupler (125) phase shifting signals (110, 111) by substantially 90 degrees to produce phase shifted signals (120, 121), coupling signals (110, 121) to produce a coupled signal (130) and the signals (111, 120) to produce a coupled signal (140). In phase shifters (450, 460), the coupled signals (130, 140) are independently phase shifted according to two independent frequency selective phase shifting functions (150, 160) to produce phase shifted coupled signals (170, 180) which are combined at combiner (190) to produce a combined carrier signal (199). A phase shifting attribute of functions (150, 160) is divided over predetermined frequency bands (210, 220, 230). Over the frequency bands (210) phase shift (260) leads phase shift (250) and lags over the frequency band (230) by substantially 90 degrees.

REFERENCES:
patent: 4558283 (1985-12-01), Yamagiwa
patent: 5148128 (1992-09-01), Mazumder
patent: 5355101 (1994-10-01), Ichihara et al.
patent: 5708399 (1998-01-01), Fujii et al.
patent: 5912975 (1985-12-01), Schott

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