Hybrid coupler and UHF television channel mixer comprising...

Details Hybrid coupler and UHF television channel mixer comprising... Hybrid coupler and UHF television channel mixer comprising...

2004-09-10

2011-10-25

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S109000

Reexamination Certificate

active

08044748

ABSTRACT:
A hybrid coupler for UHF-band television transmission has a box containing two lines, each of which is insulated from the box and from the other line, is connected to the other line in a “tandem” configuration, and has a first, a second, and a third portion separate from one another and connected respectively to the third, second, and first portion of the other line to define a first, a second, and a third coupling section to achieve a constant connection over the whole UHF band.

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patent: 7429903 (2008-09-01), Antkowiak
patent: 1 519 254 (1978-07-01), None
patent: 1519254 (1978-07-01), None
Chang, Tien-Yu et al. “Coplanar-Waveguide Tandem Couplers with Backside Conductor”,IEEE Microwave and Wireless Components Letters, vol. 13, No. 6, Jun. 2003, pp. 214-216.
Lange, J. “Interdigitated stripline quadrature hybrid”,IEEE Transactions on Microwave Theory and Techniques, Dec. 1969, pp. 1150-1151.
Tresselt, C.P. “The Design and Construction of Broadband, High-Directivity, 90-Degree Couplers Using Nonuniform Line Techniques”,IEE Transactions on Microwave Theory and Techniques, vol. MTT-14, No. 12, Dec. 1966, pp. 647-656.
Search Report issued by European Patent Office on Oct. 10, 2008 for corresponding European application 04787587.7.

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