5G-A Co-site Network Construction
How FDD/TDD Duplexers Solve Base Station Transmit-Receive Coexistence & Co-frequency Interference Pain Points
An RF duplexer is a core multiplexing passive component for base station antenna ports, integrated with dual-channel filtering & isolation structure. It supports bidirectional transmit-receive signal sharing via one single antenna and separates TX/RX frequency bands without mutual crosstalk. A triplexer enables three-channel antenna multiplexing. Different from single-function filters, duplexers integrate TX & RX filtering circuits in one unit, featuring compact size and high compatibility, which are essential for 4G/5G FDD networking, indoor distribution and macro AAU modules.
1. Antenna Multiplexing: Realize TX&RX signal transmission via one antenna, reduce antenna deployment quantity and cut site construction cost; 2. Circuit Protection: Block high-power reflected TX signal to avoid breakdown of sensitive receiving chips and protect PA & receiver modules; 3. Frequency Isolation: Suppress adjacent frequency interference and inter-modulation signal to meet 3GPP telecom standard; 4. Network Stabilization: Reduce link coupling noise, improve downlink rate and uplink receiving sensitivity.
Current Most Widely Used Band: FDD Band n1 (1920MHz–2170MHz)
Band n1 is the world’s top FDD commercial band for 4G/5G co-construction. It covers urban, township and rural full scenarios, compatible with macro base stations, wall-mounted micro stations and indoor distribution systems. It is the most universal component for operator co-site projects, supporting 4G evolution and 5G large-area coverage simultaneously.
2. Existing Industry Pain Points
Multi-system co-site deployment brings prominent pain points: traditional duplexers own insufficient isolation and poor inter-modulation performance, raising uplink noise floor and causing terminal access failure & network lag; common products suffer frequency drift under extreme temperature, forcing base station power reduction; high insertion loss leads to extra power consumption and rising OPEX.
① High-performance cavity design, PIM ≤ -160dBc, suitable for multi-operator high-interference co-site scenarios; ② TX-RX isolation ≥85dB, completely block reflected transmitting signal; ③ Ultra-low insertion loss ≤0.6dB, reduce base station power consumption; ④ Wide temperature frequency stability from -40℃ to +75℃, no performance attenuation for outdoor deployment; ⑤ Standard DIN/N interface, compatible with Huawei, ZTE, Ericsson AAU equipment, spot stock & customized interface available.
Solve four core pain points including co-site interference, high noise floor, temperature drift and high power consumption. Ideal for stock base station renovation and new 5G FDD bulk procurement projects with stable delivery and high compatibility.
uture Cutting-edge Band For 2026 & Beyond: 5G-A/6G SBFD Band n104 (7125MHz–7425MHz)
Split-Band Full-Duplex (SBFD) technology will be massively commercialized globally in 2026. Band n104 high-frequency duplexer is the key component for 5G-A ultra-broadband & low-latency networking, and pre-research supporting part for 6G spectrum convergence. It serves high-density urban networking, smart factory communication, low-altitude UAV networking and autonomous vehicle low-latency connection, becoming the core upgrading track of base station RF industry.
2. Cutting-edge Technical Bottlenecks
① SBFD enables co-frequency TX&RX working simultaneously, traditional duplexers fail to provide enough isolation to eliminate self-interference; ② High dielectric loss at 7GHz leads to large in-band fluctuation and unqualified bandwidth; ③ Traditional bulky cavity structure cannot integrate with Giga-MIMO integrated antenna module; ④ Hard to control high-frequency inter-modulation, causing cross-cell spectrum crosstalk easily.
3. Our Exclusive SBFD Duplexer Advantages
① Self-developed multi-coupling isolation structure, co-frequency isolation ≥92dB, solve SBFD self-interference industry bottleneck; ② Special low-loss ceramic cavity, in-band ripple ≤0.3dB, guarantee full-bandwidth Giga-MIMO transmission; ③ Mini integrated structure, 52% smaller size, compatible with antenna-RF integrated module; ④ High-precision laser tuning technology, PIM ≤-165dBc for dense urban networking; ⑤ Supporting one-stop delivery with matched circulators, connectors and test cables for 6G pilot base stations.
Comply with 2026 SBFD commercial standard in advance, solve three cutting-edge bottlenecks including co-frequency self-interference, miniaturization difficulty and high-frequency inter-modulation, help OEMs finish 5G-A upgrading and 6G pilot construction, seize next-generation RF supply chain advantage.
We supply full-series base station duplexers & triplexers covering 4G/5G full bands and 6G SBFD pre-research bands, together with supporting filters, circulators, isolators, power dividers, couplers, RF connectors and test cables. We provide spot stock shipment and customized OEM/ODM service on power, frequency and interface, with complete factory RF test reports. Welcome telecom equipment manufacturers, operator integrators and base station renovation enterprises for sample test and bulk cooperation.