Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Reexamination Certificate
2007-04-10
2007-04-10
Takaoka, Dean (Department: 2817)
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
C333S116000
Reexamination Certificate
active
11138317
ABSTRACT:
A balancing/unbalancing (balun) structure includes two input ports are coupled to a differential signal. An isolated port is connected to ground through a matched resistance. An output port is coupled to a single-ended signal corresponding to the differential signal. A plurality of traces connect the two input ports, the load connection port and a tap point to the output port. A f2rejection filter is wrapped around the balun and includes a first folded element with a transmission length of λ2/4 and connected to the output port. A second folded element has a transmission length of λ2/4 and connected to the tap point. A third folded element connects the tap point to the output port and has a transmission length of λ2/4.
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Broadcom Corporation
Sterne Kessler Goldstein & Fox PLLC
Takaoka Dean
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