To meet the miniaturization requirements of duplexers in RF front-end applications, this paper employs a comprehensive approach, incorporating techniques such as topology design, matching network design, chip layout design, and package design. Consequently, a miniaturized high-performance film bulk acoustic wave resonator (FBAR) duplexer was developed. The duplexer operates in the receive band frequency range of 1 805-1 880 MHz and the transmit band frequency range of 1 710-1 785 MHz. The insertion loss in both the RX and TX bands is less than 3.0 dB，with RX rejection in the TX band and TX rejection in the RX band exceeding 50 dB. Additionally, the isolation is greater than 50 dB. The product dimensions are 2.0 mm×1.6 mm×0.9 mm. The duplexer demonstrates characteristics of miniaturization, low insertion loss, high rejection, and high isolation, meeting system performance requirements.