Communication equipment and filter thereof

Abstract

The invention discloses communication equipment and a filter thereof. The filter comprises: a shell provided with a first direction and a second direction which are perpendicular to each other and comprising a first surface and a second surface which are arranged oppositely; a first common cavity arranged on the first surface of the shell; a first filtering branch coupled with the first common cavity and comprising ten filtering cavities which are coupled in sequence, wherein four cross coupling zero points are formed; a second filtering branch coupled with the first common cavity and comprising eight filtering cavities which are coupled in sequence, wherein two cross coupling zero points are formed; a second common cavity arranged on the second surface of the shell; a third filtering branch coupled with the second common cavity and comprising ten filtering cavities which are coupled in sequence, wherein four cross coupling zero points are formed; and a fourth filtering branch coupled with the second common cavity and comprising eight filtering cavities which are coupled in sequence, wherein two cross coupling zero points are formed. According to the invention, the four filtering branches are respectively arranged on the front and back surfaces of the shell, so that the volume of the filtering cavity can be reduced, and the cost is reduced.

Description

technical field [0001] The present application relates to the technical field of communication, in particular to a communication device and a filter thereof. Background technique [0002] In the mobile communication system, the required signal is modulated to form a modulated signal, and carried on the high-frequency carrier signal, transmitted to the air through the transmitting antenna, and the signal in the air is received through the receiving antenna. Among the signals received by the receiving antenna, not only Include the desired signal, but also include other frequency harmonics, noise signals. For the signal received by the receiving antenna, it is necessary to use a filter to filter out unnecessary harmonics and noise signals. Therefore, the designed filter must precisely control its bandwidth. [0003] The inventors of the present application have discovered during long-term research and development work that the filter cavities of the current filter are arrange...

AI Technical Summary

Problems solved by technology

[0003] The inventors of the present application found in long-term research and development work that the filter cavities of the current filter are arranged on the same side, and the volume of the filter is relatively large and the cost is relatively high

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