Compact RF circuit with high common mode attenuation

Details Compact RF circuit with high common mode attenuation Compact RF circuit with high common mode attenuation

2006-04-05

2008-08-05

Jones, Stephen E (Department: 2817)

Wave transmission lines and networks

Transmission line inductive or radiation interference...

C333S08100R, C333S004000, C333S156000

Reexamination Certificate

active

07408424

ABSTRACT:
A compact RF differential circuit has a first differential I/O port comprising a first pair of signal carrying terminals which is connected to a source termination and a second differential I/O port comprising a second pair of signal carrying terminals which is connected to a load termination. The common mode impedance measured at either the first or second differential I/O port is zero. The differential mode impedance measured at the first differential I/O port is equal to the differential mode impedance of the source termination, and the differential mode impedance measured at the second differential I/O port of the circuit is equal to the differential mode impedance of the load termination. The circuit attenuates the common mode component of an RF signal which is incident on the first I/O port of the circuit so that a signal emitted from the second I/O port of the circuit has a differential mode component which is substantially greater than the common mode component and the circuit attenuates the common mode component of an RF signal which is incident on the second I/O port of the circuit so that a signal emitted from the first I/O port of the circuit has a differential mode component which is substantially greater than the common mode component.

REFERENCES:
patent: 2005/0140460 (2005-06-01), Poirier et al.

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