Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Reexamination Certificate
2007-03-30
2008-09-02
Takaoka, Dean O (Department: 2817)
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
C333S116000
Reexamination Certificate
active
07420437
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: 4375699 (1983-03-01), Hallford
patent: 5455545 (1995-10-01), Garcia
patent: 5936594 (1999-08-01), Yu et al.
patent: 6018277 (2000-01-01), Vaisanen
patent: 6300919 (2001-10-01), Mehen et al.
patent: 6515556 (2003-02-01), Kato et al.
patent: 6791431 (2004-09-01), De Flaviis
patent: 6891448 (2005-05-01), De Flaviis
patent: 6900706 (2005-05-01), De Flaviis
patent: 7202757 (2007-04-01), De Flaviis
patent: 2144985 (1973-03-01), None
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).
Settaluri Raghu K. et al., “Compact Folded Line Rat-Race Hybrid Couplers”, IEEE Microwave Guided Wave Lett; IEEE Translations on Microwave and Guided Wave Letters, Feb. 2000, IEEE, vol. 10, No. 2, pp. 61-63.
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).
Matsuura, H. et al., “Monolithic Rat-Race Mixers for Millimeter Waves”, IEEE, pp. 101-104 (Jul. 2004).
Johnson, K.M., “X-Band Integrated Circuit Mixer with Reactively Terminated Image”, Transactions on Microwave Theory and Techniques, IEEE, vol. 16, No. 7, pp. 388-397 (Jul. 1968).
European Search Report issued Jan. 13, 2004 for Appl. No. EP/03019915.2 4 pages.
European Search Report Issued Jan. 13, 2004 for Appl. No. EP/03019914.5, 4 pages.
Broadcom Corporation
Sterne Kessler Goldstein & Fox PLLC
Takaoka Dean O
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