RF filter

Abstract

The invention relates to an RF filter, particularly a stripline type RF filter, comprising a casing (C) and two or more strip-conductor-type resonators (110, 112, 114, 1 16 and 140, 142, 144, 146) in the casing. At a distance from the ends of the resonator, between the resonator sides, there are one or more coupling lines (120, 122, 124 and 152, 154, 156) forming an integral piece with the resonators.

Description

[0001] Background of the invention [0002] The present invention relates to RF (Radio Frequency) filters. [0003] RF filters, ie radio frequency filters, are used in conjunction with RF equipment, such as transmitters, receivers or transceivers, used eg in base stations of mobile telephone networks. [0004] Resonator-type filters include a housing structure with one or more compartments, the shape of which is defined by the wall structure of the housing. [0005] Typically, a compartment of a housing structure may include an inner conductor attached to the bottom of the compartment or chamber, called a resonator or resonator pin (pin, foot / pin), a common structure is where the inner conductor or resonator A coaxial resonator that shares a common axis (ie, coaxial) with surrounding compartments or chambers. The compartments in the metal housing together with the metal inner conductor form a resonant circuit. In more complex high-frequency filters, especially housing structu...

AI Technical Summary

Problems solved by technology

[0008] In prior art solutions, the integral nature of the structure has not been advanced enough and the part that changes the frequency response of the filter is a separate part that must be attached to the resonator

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