111 results about "Coaxial resonators" patented technology

A band-stop filter (300) implemented by a coaxial resonator for filtering antenna signals in a base station of a mobile communication network. The starting point is a structure with a transmission line and coaxial resonators electromagnetically coupled parallel to it, the natural frequencies of which are slightly different from each other. The resonators (R1, R2, R3) form an integral conductive resonator housing (310), the inner space of which is divided into a resonator cavity by conductive partitions. In the present invention, the center conductor (321) of the transmission line is placed inside the resonator housing such that it passes through all resonator cavities and the housing simultaneously acts as the outer conductor of the transmission line. The resonator cavity is thus part of the cavity of the transmission line. When an electromagnetic field of the same frequency as the resonator's natural frequency is present on the transmission line, the resonator in question starts to oscillate, causing the electromagnetic field to reflect back into the power supply. The strength of the resonance and the width of its area of ​​influence are simultaneously set eg by appropriate selection of the distance of the inner conductor (301) of the resonator from the center conductor (321) of the transmission line. The number of structural components and metal joints in the stopband filter is relatively small. Consequently, less intermodulation occurs in the filter than in corresponding known filters. Other functional units can also be easily incorporated into the structure of the band-stop filter.

A mixed-mode cavity filter is disclosed. The disclosed cavity filter includes: at least one first cavity configured to hold a metal coaxial resonator; and at least one second cavity configured to hold a dielectric resonator, where a first coupling window is formed in a wall formed between the first cavity and the second cavity, the first coupling window includes a horizontal window formed parallel to a bottom portion and a vertical window formed perpendicularly to the bottom portion, and the horizontal window and the vertical window overlap each other in at least a partial area. A mixed-mode filter according to an embodiment of the invention can achieve a small size and a light weight while providing low losses.

A synthesizer module / oscillator assembly includes a voltage controlled oscillator with a coaxial resonator. In one embodiment, the module measures 20.3 mm×14.8 mm×3.9 mm and the coaxial resonator is positioned on the circuit board of the module between a phase locked loop integrated circuit and a main section of the voltage controlled oscillator. The phase locked loop circuit includes a loop filter and is adapted to receive the frequency signal generated by the voltage controlled oscillator and generate an adjusted frequency signal.

A coaxial resonator according to an embodiment of the invention includes a tubular dielectric block, an inner conductor having a thin-film, multi-layer electrode structure, which is formed on an outer surface of a cylindrical shaft received in the hole of the tubular dielectric block, and an outer conductor formed on an outer surface of the tubular dielectric block. The cylindrical shaft is inserted into the hole in the dielectric block, and is held by a holding member and an outer frame.