Suspended dielectric combline cavity filter

Abstract

A combline filter has a ceramic resonator disposed inside at least one cavitywall. Because the resonator is implemented as a hollow rod, a tuning element may be inserted into an opening on 5 the top ofthe rod to tune its frequency. A mounting element, inserted into an opening on the bottomofthe rod secures its position inside a cavity resonator. Instead of soldering the resonator to the filter's walls, the resonator is supported above a bottom or side wall of the cavityresonator.

Description

technical field [0001] The present invention relates generally to combline filters for microwave and radio frequency signals, and more particularly to structures for suspending ceramic resonators on cavities. Background technique [0002] Coaxial combline filters are widely used in wireless communication systems. More specifically, these devices are often used to filter out unwanted frequencies. When implemented as a bandpass filter, the user can tune the combline filter to select a desired frequency range, called the passband, and discard signals from frequency ranges above or below the desired range. Such filters are often referred to as combline filters because they comprise a series of parallel structures similar to the teeth on a comb. [0003] Cavity resonators confine electromagnetic radiation within a solid structure, usually formed as a cuboid. Since this cavity acts as a waveguide, the pattern of electromagnetic waves is limited to those waves that can fit withi...

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Problems solved by technology

Unfortunately, both the plating and welding steps involve the use of complex metallurgical techniques which are expensive and time consuming

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