Low cost butler matrix modeformer circuit

Details Low cost butler matrix modeformer circuit Low cost butler matrix modeformer circuit

1997-02-13

1998-07-07

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

H01Q 322, H01Q 324, H01Q 326

Patent

active

057775796

ABSTRACT:
An implementation of a Butler matrix transformation used to process antenna signals and, in particular, to transform signals obtained from an N-port antenna into mode signals used for direction finding and other purposes. A reverse transformation is used when the antenna is operating in a transmit mode. Instead of using a single Nth order transformation matrix, the circuit of the invention employs a decomposed form of the transformation matrix, thereby reducing the complexity of the transformation by using lower-order matrices. In an example of the invention for an 8.times.8 transformation, the circuit complexity is further reduced by using an additional level of decomposition, in which phase shifting is effected by a circuit implementation of a single 8.times.8 diagonal phase shift matrix requiring only three phase shift circuits. Reduction in circuit complexity, particularly in the number of phase shift circuits, reduces bias errors in the overall transformation and reduces fabrication cost.

REFERENCES:
patent: 4231040 (1980-10-01), Walker
patent: 4633259 (1986-12-01), Hrycak
patent: 4638317 (1987-01-01), Evans
patent: 5373299 (1994-12-01), Ozaki et al.
patent: 5561667 (1996-10-01), Gerlach

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