Compact balun with rejection filter for 802.11a and 802.11b...

Details Compact balun with rejection filter for 802.11a and 802.11b... Compact balun with rejection filter for 802.11a and 802.11b...

2005-05-31

2005-05-31

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

C333S116000

Reexamination Certificate

active

06900706

ABSTRACT:
A balancing/unbalancing (balun) structure for operating at frequency f1includes a microstrip printed circuit board (PCB). A balun on the PCB 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 on the PCB connect the two input ports, the load connection port and a tap point to the output port. A f2rejection filter on the PCB 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.

REFERENCES:
patent: 5455545 (1995-10-01), Garcia

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