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Filter and communication system

A filter and filter cavity technology, applied in the field of communication, can solve the problems of poor transmission band performance, irregular arrangement of filter branches, large filter volume, etc., to achieve the effect of improving out-of-band suppression, satisfying high isolation and reducing volume

Inactive Publication Date: 2021-06-29
ANHUI TATFOOK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The inventors of the present application have found in long-term research and development work that in order to reduce the size of the filter, two or more sets of filtering branches with different frequencies are usually formed into a filter, but due to the irregular arrangement of the filtering branches , and there is no setting without a common cavity, resulting in a larger volume of the existing filter
Moreover, the out-of-band suppression performance of the transmission frequency band and the reception frequency band is poor, and it is difficult to achieve a high degree of isolation between the received signal and the transmitted signal

Method used

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  • Filter and communication system
  • Filter and communication system
  • Filter and communication system

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Embodiment Construction

[0022] The application will be described in further detail below in conjunction with the accompanying drawings and embodiments. In particular, the following examples are only used to illustrate the present application, but not to limit the scope of the present application. Likewise, the following embodiments are only some of the embodiments of the present application but not all of them, and all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0023] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein, for example, can be practi...

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Abstract

The invention discloses a filter. The filter comprises a shell, a common cavity, a transmitting filter branch and a receiving filter branch, wherein the shell has a first direction and a second direction, and the public cavity is arranged on the shell; the transmitting filter branch is coupled with the common cavity and is composed of six filtering cavities which are sequentially coupled along a main transmitting coupling path, and the six filtering cavities further form two cross coupling zero points; and the receiving filter branch is coupled with the common cavity and consists of six filtering cavities which are sequentially coupled along the main receiving coupling path, and the six filtering cavities further form two cross coupling zero points. In this way, the size of the filter can be reduced, and the out-of-band rejection performance and the like of the filter can be improved.

Description

technical field [0001] The present application relates to the technical field of communication, in particular to a filter and a communication system. Background technique [0002] In the mobile communication system, the required signal is modulated to form a modulated signal, which is carried on a 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. And if the transmit channel and the receive channel exist at the same time, it should also be considered to maintain high isolation between the passbands of the channels. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/208H01P1/209
CPCH01P1/208H01P1/209
Inventor 钟志波张海峰韩军平李佳琦
Owner ANHUI TATFOOK TECH CO LTD