The 700MHz and 800MHz dual-band RF duplexer is a frequency-specific customized duplex component developed for low-frequency communication systems covering 700MHz and 800MHz frequency bands, targeting FDD LTE communication, public security emergency communication, railway dedicated communication, and IoT low-frequency wide coverage systems. The 700MHz and 800MHz frequency bands have the advantages of low signal attenuation, strong penetration, and wide coverage, and are widely used in rural network coverage, remote area communication, and dedicated industry communication scenarios. This professional duplexer is precisely designed for the frequency characteristics of these two low-frequency bands, realizing efficient transceiving signal separation, low-loss transmission, and high-isolation anti-interference, making up for the poor matching performance of universal duplexers in low-frequency bands.

In terms of performance optimization, the 700MHz/800MHz RF duplexer adopts a targeted low-frequency resonant cavity design and impedance matching circuit, fully adapting to the electromagnetic propagation characteristics of low-frequency RF signals. For the 700MHz and 800MHz FDD frequency division intervals, the product achieves accurate passband positioning, with flat in-band frequency response and insertion loss controlled below 1.0dB, ensuring long-distance stable transmission of low-frequency signals. The inter-channel isolation of the two frequency bands is higher than 38dB, which can effectively isolate mutual interference between 700MHz and 800MHz transceiving signals, and avoid signal crosstalk between adjacent low-frequency bands. In addition, it has excellent anti-fading performance and environmental stability, can resist signal fading caused by complex terrain and building occlusion, and maintains stable working performance in high and low temperature, humid, and windy and sandy environments.

This dual-band RF duplexer has extremely high practical value in low-frequency wide-coverage communication engineering. In 700MHz 4G/5G base station construction, it supports FDD duplex communication of low-frequency base stations, helps operators realize wide-area network coverage with fewer base stations, and reduces communication construction costs. In public security, fire protection, and emergency communication systems based on 800MHz frequency band, it ensures stable and unobstructed emergency command communication, improving the reliability of emergency rescue communication. In railway and urban rail transit dedicated communication systems, it guarantees the anti-interference capability of low-frequency communication signals and ensures the safety and stability of train operation communication. With the continuous promotion of low-frequency network coverage and dedicated industry communication construction, 700MHz and 800MHz RF duplexers have become key supporting components for low-frequency wide-coverage communication systems, providing reliable duplex protection for various professional low-frequency communication scenarios.