Lk Products Oy

Jari Pelkonen

Erkki O Niiranen

Panu Hagstr&ouml;m

Filter construction and oscillator for frequencies of several gigahertz

A coaxial resonator filter (1', 50, 50', 50') comprises a dielectric boardlike element (11, 51, 51') and on its surface at least one electrically conductive element (17, 19, 20, 21, 52) to provide an electromagnetic coupling to at least one coaxial resonator (3, 53). The dielectric boardlike element may be the same as the filter's base plate, in which case its outer surface comprises a continuous earth plane (55), or it may be parallel to a separate electrically conductive base plate (56). Link (17), tap (19) and capacitive (20) coupling elements can be realized on the surface of the dielectric board.

High frequency filter with a dielectric board element to provide

The invention relates to a radio frequency filter comprising at least two helix resonators (HX1-HX2) placed at a distance from each other, each of which is wound of a metal wire into a cylindrical coil. A conductor (MLIN2), preferably a microstrip line, runs between two neighboring resonators and is provided at a distance (d1, d2) from each of the resonator coils so that one part (3) of it is electromagnetically connected to one resonator (HX 1) and the other part (4) is electromagnetically connected to another resonator (HX2).

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Tuomioja, Finland

Jari Pelkonen