Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Reexamination Certificate
2000-03-07
2002-03-19
Pascal, Robert (Department: 2817)
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
C333S202000, C333S206000, C333S207000
Reexamination Certificate
active
06359533
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention pertains to combline filters and, in particular, to radio frequency band pass filters.
2. Description of the Related Art
Various filter designs have been proposed to allow certain frequencies to be transmitted to the output load while rejecting the remaining frequencies. Such filters designed for use in the frequency range of several hundred megahertz to one gigahertz include as an important example, combline strip line filters fixed to a design frequency. These types of filters are sometimes termed “mechanical” filters, a reference to their physical construction. Combline filters of this type, especially when designed for high Q, low insertion loss applications, require demanding high tolerance O-ring and bushing components and correspondingly intricate assembly techniques, requiring substantial labor investment.
It is not uncommon, due to the long lead time sometimes required for fabrication and delivery, that the design frequency characteristics of an earlier fabricated filter may no longer precisely match requirements needed at the time of installation. In order to alter the center frequency of the filter, for example, the filter must be returned to the manufacturer for rebuilding. Time delays can be reduced by maintaining an inventory at the manufacturer's site, although warehousing and storage costs incurred by the manufacturer are substantial and ultimately the purchaser incurs additional charges for the replacement service.
REFERENCES:
patent: 3408599 (1968-10-01), Horton et al.
patent: 3539953 (1970-11-01), Jones
patent: 4488130 (1984-12-01), Young et al.
patent: 5151670 (1992-09-01), Blair et al.
Adam Julie A.
Alms Gregory A.
Merlock Alan J.
Jacobs Jeffrey K.
Motorola Inc.
Nguyen Patricia T.
Pascal Robert
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