Deformed spherical waveguide resonator and filter based on it and its processing method

Abstract

The invention discloses a deformed spherical waveguide resonator, a filter based on the deformed spherical waveguide resonator and a processing method of the filter. The wide stopband suppressed filter structure based on the deformed spherical waveguide resonator comprises a waveguide flange plate, a second waveguide flange plate and five directly coupled deformed spherical waveguide resonant cavities. Through changing the arrangement mode of the five deformed spherical waveguide resonant cavities, a coupling direction between the adjacent resonant cavities is rotated for 90 degrees, so that the coupling component of a high-order mode is reduced; through processing depressions in the top surface and bottom surface of the spherical waveguide resonator to increase the frequency interval of the high-order mode and a base mode, the wider spurious-free stopband is achieved, the resonant cavities have the different high-order modes due to the depressions with different depth of the resonantcavities, and thus spurious passband is damaged; cross slots are formed in the centers of the top and bottom of the third resonator, so that radiation of the high-order mode is lost, and thus the spurious suppression capacity more than 34dB within the wide stopband is achieved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a deformed spherical waveguide resonator, a filter based thereon and a processing method thereof. Background technique [0002] With the development of wireless communication technology, modern advanced radio communication systems require high-performance and multi-functional microwave and millimeter-wave devices to adapt to complex and changeable electromagnetic environments. In these radio communication systems, especially the RF front-end transceiver systems, traditional microwave and millimeter wave passive waveguide devices, such as waveguide filters, have the advantages of strong spurious suppression capability, low RF loss and large power capacity, and are of great concern to researchers. one of the key points. [0003] In general, a high quality factor (Q) resonator is chosen whenever possible to achieve low RF losses. Air-filled metal cavity ...

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Problems solved by technology

But in particular, the upper surface of the device realized by the metal SLM printing process has the characteristics of high surface roughness and serious distortion, which will lead to a decrease in the quality factor of the device and deterioration of performance

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