Circuit including a phase shifter for generating signals for ele

Details Circuit including a phase shifter for generating signals for ele Circuit including a phase shifter for generating signals for ele

1993-05-05

1994-10-04

Blum, Theodore M.

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

Directive

Including a steerable array

342372, H01Q 322, H01Q 324, H01Q 326

Patent

active

053530322

ABSTRACT:
A circuit generates RF signals for electronically scanned antennas and in particular for TACAN systems. The circuit includes a phase shifter that is particularly suitable for use in generating these RF signals. Instead of using circuits including a large Butler-matrix, a small Butler-matrix having only a few outputs is used for combining a limited number of outputs of a power divider. By further combining the remaining outputs of the power divider with the few outputs of the Butler-matrix by the use of electromagnetic combiners, a plurality of RF signals that are suitable for use by electronically scanned antennas are obtained from the circuit which is comparatively simple in structure yet produces very accurately controlled RF signals.

REFERENCES:
patent: 3568105 (1971-03-01), Felsenheld
patent: 3747102 (1973-07-01), Cooper
patent: 4905012 (1990-02-01), Foti
patent: 5208564 (1993-05-01), Burns et al.
19th European Microwave Conference, Sep. 1989, London, GB pp. 959-965, Foti et al "An Intelligent Electronically Spinning Tacan Antenna".
AP-S International Symposium on Antennas and Propagation Jun. 1985, Vancouver, Canada, pp. 115-119 Greving et al, "An Optimized Circular Array-Application to the Tacan System".
Microwaves & RF, May 1989, pp. 194, 196, 199, and 201-203, MacNamara et al, "Stripline Network Drives 32 Elements to Wide Bandwidths".
K. H. Hering, "The Design of Hybrid Multiple Beam Forming Networks", pp. 240-268, Phased-Array Antennas, TRW Systems Group.
Barry K. Watson, "Product Range, RF Products", Aug. 1987, p. 29, ERA Technology Limited.

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