Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Patent
1987-08-06
1988-08-23
Gensler, Paul
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
375 36, 379 93, H03H 742
Patent
active
047664029
ABSTRACT:
Impedance of each termination in a wiring environment, wherein unshielded twisted pair wires with a characteristic impedance at 10 MHz of about 85 to 130 ohms are used as a communication medium for a local area network where run lengths do not exceed about 250 feet between terminations, is matched at each termination by an impedance matching termination and line conditioning apparatus, hereinafter a matching device. The matching device matches impedance of twisted pair wiring to a nominal 50 termination over a bandwidth of d.c. to above about 10 MHz. The matching device comprises a low-pass filter coupled at a first port to a fifty-ohm standard BNC connector and at a second port to a tapped autotransformer means with a d.c. blocking capacitor for impedance matching and balanced to unbalanced conversion, which in turn is coupled to a common mode inductor, which in turn is coupled to terminals for each side of a twisted pair cable. The common mode inductor is for passing differential signals over the entire frequency spectrum while rejecting all common mode signals over substantially all of the frequency spectrum.
REFERENCES:
patent: 3812292 (1974-05-01), Tink et al.
patent: 4201962 (1980-05-01), Hosoya
patent: 4717896 (1988-01-01), Graham
3Com Corporation
Gensler Paul
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