Radio frequency front-end circuit for 5G NR-U frequency band and circuit board

The invention discloses a communication circuit for a 5G NR-U frequency band. The communication circuit comprises a radio frequency balun, a downlink radio frequency communication module and an uplink radio frequency communication module, the radio frequency balun is used for converting impedance matching between a differential balance end signal and a single-end signal output by the radio frequency transceiver to generate an impedance matching signal; the downlink radio frequency communication module is used for performing power detection on the impedance matching signal based on an integrated circulator, a first radio frequency switch and a second radio frequency switch to output a radio frequency modulation signal of a gain; and the uplink radio frequency communication module is used for suppressing the received out-of-band signal and amplifying the received in-band signal based on the integrated circulator and the second radio frequency switch to generate an amplified signal and sending the amplified sign