Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2006-07-04
2006-07-04
Le, Dinh T. (Department: 2816)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
C333S202000, C505S210000
Reexamination Certificate
active
07071797
ABSTRACT:
A method and apparatus to control intermodulation in a circuit for filtering over the air signals by creating an asymmetric resonator is disclosed. By creating the asymmetric resonator, the intermodulation from out of band signals is reduced while keeping the filter size relatively unchanged. In general, the intermodulation is reduced by lowering the current density in the resonator (e.g., so as to maintain the linearity of the electrical characteristics of the resonator), and more specifically by utilizing the principle that the inductive elements in a resonator experience the largest current changes. Therefore, the size of the inductor is changed in order to accommodate the larger power. An additional feature of the present invention is that not every inductive element of the filter needs to be enlarged. Generally only the first (or alternatively the first and second) resonators need to be increased in size. Another feature of the present invention is the physical order in which the filters are laid out. Laying out the components with the bandpass filter first can prevent (or significantly reduce) intermodulation generated by those components due to out-of-band interference signals.
REFERENCES:
patent: 4981838 (1991-01-01), Whitehead
patent: 5760667 (1998-06-01), Young et al.
patent: 5888942 (1999-03-01), Matthaei
patent: 5914296 (1999-06-01), Shen
patent: 5922650 (1999-07-01), Ye
patent: 6026311 (2000-02-01), Willemsen Cortés et al.
patent: 6041245 (2000-03-01), Mansour
patent: 6075427 (2000-06-01), Tai et al.
patent: 6222429 (2001-04-01), Satoh et al.
patent: 6370404 (2002-04-01), Shen
patent: 6424846 (2002-07-01), Cortés et al.
patent: 6529750 (2003-03-01), Zhang et al.
patent: 6633208 (2003-10-01), Salkola et al.
patent: 6653917 (2003-11-01), Kang et al.
patent: 2001/0025013 (2001-09-01), Abdelmonem
patent: 2001/0038320 (2001-11-01), Abdelmonem
patent: 11068404 (1999-03-01), None
patent: 99/52208 (1999-10-01), None
Chaloupka, H. et al., “Superconducting planar disk resonators and filters with high power handling capability,”Electronics Letters, vol. 32, No. 18, pp. 1735-1737 (Aug. 29, 1996).
Dahm, T. et al., “Analysis and Optimization of Intermodulation in High-TcSuperconducting Microwave Filter Design,”IEEE Transactions On Applied Superconductivity, vol. 8, No. 4, pp. 149-157 (Dec. 1998).
Liang, G. et al., “High-Power HTS Microstrip Filters for Wireless Communication,”IEEE Transactions On Microwave Theory And Techniques, vol. 43, No. 12, pp. 3020-3029 (Dec. 1995).
Dahm, T. et al., “Theory of intermodulation in a superconducting microstrip resonator,”J. Appl. Phys., vol. 81, No. 4, pp. 2002-2009 (Feb. 15, 1997).
Maas, S., “Chapter 4: Volterra-Series And Power-Series Analysis,”Nonlinear Microwave Circuits, pp. 155-207 (1988).
International Search Report for Application No. PCT/US02/16776 dated Sep. 23, 2002.
Conductus, Inc.
Le Dinh T.
Merchant & Gould P.C.
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