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US 2003/0156806 A1Published application
Filter
AssigneeNEC Corporation
InventorsKenichi Maruhashi, Masaharu Ito, Keiichi Ohata
Life of this patent
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AssigneeNEC Corporation
InventorsKenichi Maruhashi, Masaharu Ito, Keiichi Ohata
Estimating the term…
The present invention provides a filter exhibiting excellent filter characteristics and having less number of stages. A dielectric substrate (1) has one surface connected to a top conductor (2) and an opposite surface connected to a bottom conductor (3). A pair of rows of via-holes connecting together the top conductor (2) and the bottom conductor (3) are formed along the signal transfer direction. A slit (6) is formed in a portion of the top conductor (2) overlying the central resonator among a plurality of resonators. The slit (6) extends in a direction perpendicular to the signal transfer direction. Slits (7, 8) are formed in each of portions of the top conductor (2) overlying resonators disposed at both ends. A coplanar waveguide (9) mounted on the top conductor (2) is connected to the slit (7).
A filter comprising a rectangular waveguide tube structure filled with dielectric, wherein said rectangular waveguide structure configures therein at least one resonator, characterized in that:
A filter comprising a rectangular waveguide tube structure including a pair of first conductor planes formed on top and bottom surfaces of a dielectric substrate, and a pair of second conductor planes formed on side surfaces of said dielectric substrate, wherein said first conductor planes constitute longer-side conductor planes, and said rectangular waveguide tube structure configures therein at least one resonator, characterized in that:
A filter comprising a rectangular waveguide tube structure including a pair of conductor planes formed on top and bottom surfaces of a dielectric substrate, conductor via-holes formed in said dielectric substrate, wherein said conductor planes constitute longer-side conductor panes, and said rectangular waveguide tube structure configures therein at least one resonator, characterized in that:
Dependencies are inferred from the claim text.