Microwave balun

Details Microwave balun Microwave balun

1988-09-21

1989-11-21

Gensler, Paul

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

333246, H01P 510

Patent

active

048825530

ABSTRACT:
A broadband balun, suitable for feeding a spiral antenna, has a balanced port (20) comprising two adjacent strip conductors (16,17; 36,37) which are coupled to the unbalanced port (6) by respective paths of the same effective electrical lengths. The paths comprise respective strip transmission lines (9,10) having a common ground conductor (3; 44) which terminates in a transition to the balanced line (19), and further comprise slot line means (11; 21) and strip transmission line-to-slot line coupling means (14,15) so arranged as in operation to provide in the two strip conductors (16,17; 36,37) from an RF signal at the unbalanced port (6) signals of mutually opposite phases with respect to the common ground conductor (3; 44).
The two strip conductors (16,17) may be disposed on the outer surfaces of two substrates (1,2) with a ground plane (3) between the substrates, or may be coplanar (36,37) with a transition to an unbalanced line comprising strip conductors (45, 46) on opposite sides of a central ground conductor (44) in the same plane.

REFERENCES:
patent: 4135170 (1979-01-01), Baril et al.
patent: 4460877 (1984-07-01), Sterns
patent: 4485488 (1984-11-01), Houdart

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