Radio frequency filter comprising helix resonators
AssigneeLK-Products Oy
InventorsErkki Niiranen, Jari Pelkonen
Life of this patent
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Abstract
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).
Claims8
A radio frequency filter comprising at least two discrete helix resonators placed at a distance from each other, each of which is wound of metal wire into a cylindrical coil, the radio frequency filter comprising:
- at least one microstrip line conductor having first and second ends, the at least one microstrip line extending between the at least two resonators whereby the first end extends within an inner portion of one of the resonators and the second end extends within an inner portion of another one of the resonators such that the first end of the microstrip line conductor is connected electromagnetically to one resonator and the second end of the microstrip line conductor is connected electromagnetically to the other resonator.
A radio frequency filter according to one of the previous claims, wherein the at least one microstrip line conductor is capacitively coupled to the at least two discrete helix resonators.
Dependencies are inferred from the claim text.