Balanced-to-unbalanced converting circuit

Details Balanced-to-unbalanced converting circuit Balanced-to-unbalanced converting circuit

1997-03-06

1998-01-06

Gensler, Paul

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

333246, 455327, H01P 510

Patent

active

057059608

ABSTRACT:
A balanced-to-unbalanced converting circuit in which balanced-to-unbalanced converters are formed by a stripline in such a manner as to include a copper foil pattern which is formed on an inner or surface printed circuit layer of a multi-layer substrate and are connected to a double balanced mixer serving as a surface-mounted component provided on a first printed circuit. In the case of this converting circuit, a part of conventional surface-mounted components are eliminated from the multi-layer substrate. Thereby, the high density packaging of other surface-mounted components can be achieved. This contributes to the miniaturization, thickness reduction, weight reduction and price reduction of an entire portable telephone. Further, the balanced-to-unbalanced converters are formed by placing the copper foil pattern on a printed circuit layer which is sandwiched between grounded conductor layers of the multi-layer substrate. Thereby, the electrical connection between the balanced-to-unbalanced converters and the interference therebetween can be reduced. Consequently, the performance of the circuit can be improved.

REFERENCES:
patent: 4758922 (1988-07-01), Ishigaki et al.
patent: 4949398 (1990-08-01), Maas
patent: 5387888 (1995-02-01), Eda et al.

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