Compact balun for 802.11a applications

Details Compact balun for 802.11a applications Compact balun for 802.11a applications

2005-05-10

2005-05-10

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

C333S116000

Reexamination Certificate

active

06891448

ABSTRACT:
A balancing/unbalancing (balun) structure includes a microstrip line printed circuit board (PCB). Two input ports are coupled to a differential signal. An isolated port is connected to ground through a 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 the output port, wherein distance between adjacent traces is approximately twice PCB thickness.

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Piernas B. et al., “Improvement of the Design of 180 DEG Rat-Race Hybrid”, Electronics Letters, GB, vol. 36, No. 12, pp. 1035-1036 (Jun. 2000).
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Settaluri R. K. et al., “Design of Compact Multi-Level Folded-Line RF Couplers”, 1999 IEEE MTT-S International Microwave Symposium Digest, IEEE Transactions on Microwave Theory and Techniques, vol. 47, No. 12, pp. 2331-2339 (Dec. 1999).
Copy of European Search Report issued Jan. 13, 2004 for Appl. No. EP/03019915, 4 pages.

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