Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Patent
1990-08-27
1991-10-29
Gensler, Paul
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
336200, 330275, H01P 510
Patent
active
050619101
ABSTRACT:
A balun is formed by printed tracks (20,22) on a printed circuit board. A first conductor to one side of the board extends between ground (13) and single ended signal port 11. A second conductor to the other side of the board extends between ground 21 and a balanced signal port (12) in electrical symmetry. The arrangement provides a construction wherein the balanced side of the balun is entirely on one side of the board, resulting in symmetrical parasitic effects in the balanced limbs. Also cross board connections are not required. The balun allows a printed circuit form to be used where parasitic effects are likely, such as high frequency power amplifiers with their associated large heat sink, replacing other forms, such as coaxial cable types.
REFERENCES:
patent: 3656071 (1972-04-01), Woodward
patent: 3991390 (1976-11-01), Conroy
patent: 4857869 (1989-08-01), Terakawa et al.
patent: 4980654 (1990-12-01), Moulton
Gensler Paul
Handy Robert M.
Motorola Inc.
Parsons Eugene A.
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