Double-layer filter and harmonic improvement method

Abstract

The embodiment of the invention provides a double-layer filter and a harmonic improvement method. The double-layer filter comprises an upper-layer dielectric block and a lower-layer dielectric block.Each of the upper dielectric block and the lower dielectric block comprises a resonant cavity or a plurality of resonant cavities in coupled connection; one or more resonant cavities of the upper dielectric block and the lower dielectric block are connected through an interlayer coupling connection structure; the resonant cavities of the upper-layer dielectric block and the lower-layer dielectricblock form a coupling channel; and, under the condition of ensuring that the main coupling coefficient of the interlayer coupling connection structure is basically unchanged, a cavity area is formed in at least one interlayer coupling connection structure, so that the frequency of the interlayer coupling connection structure is far away from a passband, harmonic waves are pushed away, the harmonicwaves meet the requirements, and processing is easy.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of filters, and in particular to a double-layer filter and a method for improving harmonics. Background technique [0002] In a base station system for mobile communications, a communication signal carrying communication data within a specific frequency range is usually transmitted through a transmitting antenna, and the communication signal is received through a receiving antenna. The signal received by the receiving antenna includes not only communication signals carrying communication data within the above-mentioned specific frequency range, but also many clutter or interference signals outside the above-mentioned specific frequency range. In order to obtain a communication signal carrying communication data within a specific frequency range transmitted by the transmitting antenna from the signal received by the receiving antenna, it is usually necessary to filter the signal rece...

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Problems solved by technology

[0004] The embodiment of the present invention provides a double-layer filter and a method for improving harmonics, which is used to solve the problem of poor suppression of near-end harmonics in the passband due to the shortened wavelength of the medium-high frequency dielectric filter in the prior art after reaching the millimeter wave frequency band , so as to reduce the clutter or interference signal in the communication system

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