Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Reexamination Certificate
2007-05-08
2007-05-08
Lee, Benny (Department: 2817)
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
C333S032000
Reexamination Certificate
active
10984771
ABSTRACT:
The invention is a balun transformer that converts a single-ended (or unbalanced) signal to a differential (or balanced) signal. The balun is a printed metal pattern on a circuit board in conjunction with several low cost chip capacitors and a low cost chip inductor. The balun transformer is a modified Marchand balun that is implemented using printed transmission lines. The balun has a plurality of coupled transmission lines to improve tolerances to variations in PC board fabrication. To make the balun compact, it is electrically lengthened through the use of capacitive loading, which reduces the required physical size. Additionally, the capacitors increase the bandwidth due to the resonant interaction between the short inductive balun and the capacitors that are placed in series with the input and the output.
REFERENCES:
patent: 5644272 (1997-07-01), Dabrowski
patent: 5697088 (1997-12-01), Gu
patent: 6018277 (2000-01-01), Vaisanen
patent: 6483415 (2002-11-01), Tang
patent: 6535077 (2003-03-01), Hiroshima et al.
patent: 6714094 (2004-03-01), Gill
patent: 0 866 513 (1998-09-01), None
patent: 1 045 469 (2000-10-01), None
Nishikawa Kenjiro et al., “Compact and Broad-Band Three-Dimensional MMIC Balun,” IEEE Transactions on Microwave Theory and Techniques, IEEE, vol. 47, No. 1, Jan. 1999, pp. 96-98.
Gokdemir T. et al., “Design and Performance of GaAs MMIC CPW Baluns Using Overlaid and Spiral Couplers,” Department of Electronic and Electrical Engineering, King's College, Strand, London, 1997 IEEE MTT-S Digest, pp. 401-404.
Tsai M.C., “A New Compact Wideband Balun,” Raytheon Company, Research Division, 1993 IEEE MTT-S Digest, pp. 141-143.
Prieto, D. et al., CPS Structure Potentialities For MMICS: A CPS/CPW Transition And A Bias Network, IEEE MTT-S Digest, MTT-S, International, Baltimore, MD, Jun. 7-12, 1998; pp. 111-114.
Schellenberg, J. et al., “Low-Loss, Planar monolithic Baluns For K/Ka-Band Applications”, IEEE MTT-S Digest, MTT-S International, Anaheim, CA, Jun. 13-19, 1999, pp. 1733-1736.
European Patent Office Communication, dated Mar. 12, 2003 with attached Partial European Search Report.
Burns Lawrence M.
Pobanz Carl W.
Broadcom Corporation
Lee Benny
Sterne Kessler Goldstein & Fox P.L.L.C.
LandOfFree
Balun transformer with means for reducing a physical... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Balun transformer with means for reducing a physical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Balun transformer with means for reducing a physical... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3822994