Communication equipment and filter

Abstract

The invention discloses communication equipment and a filter. The filter includes a shell, a first common cavity, a second common cavity, a firstfiltering branch, a secondfiltering branch, a fourthfiltering branch and a fifthfiltering branch, wherein the first common cavity and the second common cavity are arranged on the shell in a spaced mode in the first direction of the shell; the first filtering branch consists of six filtering cavities which are sequentially coupled, and is coupled with the first common cavity to further form two first inductive cross coupling zero points; the second filtering branch consists of seven filtering cavities which are coupled in sequence, and is coupled with the first common cavity to further form two second inductive cross coupling zero points; the fourth filtering branch consists of six filtering cavities which are sequentially coupled, and is coupled with the second common cavity to further form two fourth inductive cross coupling zero points; and the fifth filtering branch consists of seven filtering cavities which are coupled in sequence, and is coupled with the second public cavity to further form two fifth inductive cross coupling zero points. By means of the mode, the two common cavities are arranged, the number of taps can be reduced, the size of the filter is reduced, and the production 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. 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 upper limit frequency and lower limit frequency. And if the transmit channel and the receive channel exist at the same time, it should also be considered to maintain high isolation betwee...

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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 the current filter includes multiple filtering branches, and the output and input ends of each filtering branch need to be provided with taps, which takes up the space of the filter, resulting in Big size

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