Radio frequency isolation circuit and double-frequency network equipment

Abstract

The invention discloses a radio frequency isolation circuit and double-frequency network equipment. The circuit comprises a control module, a first filtering module, a first switch module, a second switch module, a second filtering module, a third switch module and a fourth switch module; the control module is used for generating a first control signal and a second control signal; the first filtering module is connected between the first switch module and the second switch module and comprises M low-pass filters which are connected in parallel and have different cut-off frequencies; the firstswitch module and the second switch module are used for gating one low-pass filter in the first filter module by the first control signal; the second filtering module is connected between the third switch module and the fourth switch module and comprises N high-pass filters which are connected in parallel and have different cut-off frequencies; and the third switch module and the fourth switch module are used for gating one high-pass filter in the second filter module according to the second control signal. According to the invention, the in-band insertion loss of the radio frequency link canbe reduced, and the interference suppression capability is improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a radio frequency isolation circuit and dual-frequency network equipment. Background technique [0002] With the opening of the 6-7GHz frequency band (hereinafter referred to as the 6GHz frequency band), more and more network products will be designed to support the 6GHz frequency band. The isolation bandwidth is relatively narrow (about 100MHz). If it is necessary to simultaneously implement 5GHz frequency band and 6GHz frequency band operation on the network equipment, considering that the network equipment is generally small in size, the isolation between antennas cannot be too high, resulting in network equipment simultaneously. When working in the 5GHz frequency band and the 6GHz frequency band, there will be a lot of mutual interference. [0003] In response to the above problems, the general design is to use an isolation filter with large attenuation. Howev...

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Problems solved by technology

[0002] With the opening of the 6-7GHz frequency band (hereinafter referred to as the 6GHz frequency band), more and more network products will be designed to support the 6GHz frequency band. The isolation bandwidth is relatively narrow (about 100MHz). If it is necessary to simultaneously implement 5GHz frequency band and 6GHz frequency band operation on the network equipment, considering that the network equipment is generally small in size, the isolation between antennas cannot be too high, resulting in network equipment simultaneously. When working in the 5GHz frequency band and the 6GHz frequency band, there will be a lot of mutual interference

[0003] In response to the above problems, the general design is to use an isolation filter with large attenuation. However, the frequency interval between the 5GHz frequency band and the 6GHz frequency band is too narrow. There are two problems in the existing 5GHz and 6GHz isolation filters. One is that the 5GHz high The in-band insertion loss of the frequency band is too large, and the second is that the attenuation of the out-of-band 6GHz low frequency band is too small, which does not meet the isolation requirements, resulting in poor interference suppression capabilities

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