Ubiquiti airFiber 11 Low-Band Duplexer (AF-11-DUP-L)

The Ubiquiti airFiber 11 Low-Band Duplexer (AF-11-DUP-L) is a purpose-built accessory designed to enable full-duplex operation of Ubiquiti’s airFiber 11FX radios in the licensed low-band 11 GHz spectrum. As a key component in the modular airFiber 11 system, the AF-11-DUP-L allows network operators to configure their radios for high-capacity, long-range, point-to-point wireless backhaul while staying compliant with regional frequency licensing and regulatory requirements.

Specifically, the AF-11-DUP-L supports operation in the 10.7–11.2 GHz frequency range. This low-band configuration is particularly important for service providers and organizations deploying wireless links in regions where this portion of the 11 GHz spectrum is licensed and approved for use. By isolating the transmit and receive frequencies within this range, the duplexer ensures optimal full-duplex RF performance, enabling simultaneous upstream and downstream data transmission without interference.

The duplexer is an essential part of Ubiquiti’s modular design philosophy for the airFiber 11FX system. Rather than integrating a duplexer directly into the radio, Ubiquiti offers separately sold duplexers like the AF-11-DUP-L (for low-band) and AF-11-DUP-H (for high-band), allowing users to configure their radios based on deployment needs. This modular approach gives network designers increased flexibility and scalability while minimizing hardware costs and complexity.

Physically, the AF-11-DUP-L is engineered for direct installation into the airFiber 11FX radio unit. The duplexer features high-quality RF connectors that ensure secure, low-loss signal paths between the radio and the antenna system. Once installed, the duplexer becomes part of the radio's integrated RF chain, enabling precise frequency control and stable performance across long-distance wireless links.

In dual-polarity (MIMO) configurations, two AF-11-DUP-L units can be used in a single deployment—one for each AF-11FX radio. This setup enables 2x2 MIMO operation, effectively doubling throughput and improving link reliability. When paired with the airFiber AF-11G35 antenna and optional accessories like the AF-MPx4 multiplexer, the complete system is capable of delivering over 1.2 Gbps of throughput over many kilometers.

Durability and environmental resilience are also key attributes of the AF-11-DUP-L. Designed for outdoor deployment, the duplexer maintains performance under harsh weather conditions including extreme temperatures and moisture. Its sealed connectors and rugged design make it a reliable choice for installations on towers, rooftops, or remote relay stations.

In summary, the Ubiquiti airFiber 11 Low-Band Duplexer (AF-11-DUP-L) is a vital component for deploying high-performance, licensed 11 GHz wireless links. Its modularity, low-band support, and robust engineering make it an essential accessory for scalable and reliable point-to-point backhaul deployments using Ubiquiti’s airFiber 11FX system.