Radio frequency front-end frequency selection circuit and signal receiving method thereof

Abstract

The invention discloses a radio frequency front-end frequency selection circuit and a signal receiving method thereof. The circuit comprises: an antenna used for coupling and receiving a radio frequency signal; a first multipath switch used for selecting the radio frequency signal to a microstrip filter of a corresponding frequency band; the microstrip filter used for filtering an out-of-band interference signal; a low noise amplifier used for amplifying the useful radio frequency signal; and a filter group used for filtering the amplified signal; a second multipath switch used for switching the radio frequency signal obtained by the filter group to a subsequent link of a receiver to be processed. The method comprises the steps that: the radio frequency signal is coupled to a radio frequency link by the antenna, the first multipath switch switches the radio frequency signal to the microstrip filter of the corresponding frequency band, the microstrip filter filters the out-of-band interference signal and amplifies and filters the useful signal for the second time, and finally the signal is switched to the subsequent link of the receiver to be processed. The radio frequency front-end frequency selection circuit disclosed by the invention has the advantages of miniaturization, integration and strong expansibility.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a radio frequency front-end frequency selection circuit and a signal receiving method thereof. The circuit can be applied to occasions where multi-frequency bands and multi-standard communication networks coexist and are applied simultaneously. Background technique [0002] With the rapid development of wireless mobile communication, communication networks of various standards have been rapidly applied and developed, and 2G, 3G and LTE protocol standards and their networks have also appeared and been applied one after another. At present, communication networks with multiple standards and different frequency bands coexist and apply simultaneously in the market. In order to meet the diversified needs of users, the receiver needs to support more and more multi-mode and multi-band application scenarios, which brings challenges to the design of the RF frequency selec...

AI Technical Summary

Problems solved by technology

These two solutions both focus on the RF front-end circuit architecture integrating multi-mode and multi-band transceivers in home micro base stations or handheld devices. With the increase of frequency bands, the difficulty of designing front-end multiplexers will gradually increase. The volume scale will also continue to increase with the expansion of the frequency band, so the volume of the equipment is relatively large

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