Passive Indoor DAS: Hotels, airports, shopping malls, and stadiums require multi-band coverage from a single cable run. SYMAIR triplexers and quadplexers allow 900/1800/2100/2600 MHz signals to share one feeder, reducing installation complexity.
Outdoor Macro Sites: Tower-mount diplexers and triplexers combine RRU outputs at different bands before they reach a shared antenna, cutting the number of jumper cables and improving site aesthetics.
Multi-Operator POI Applications: In shared neutral-host DAS, multi-band combiners at the Point of Interface allow multiple carriers to inject traffic into a common passive network without mutual interference.
5G NR Sub-6G Deployments: Quadplexers covering 700–900 MHz and 3300–3800 MHz enable simultaneous 4G/5G signal distribution over existing passive infrastructure.
Key performance parameters for a multi-band combiner include insertion loss, isolation, return loss, band pass characteristics, Passive Intermodulation (PIM), and power handling capacity. PIM is crucial because high PIM levels can cause signal interference and degrade performance. Power handling capacity is important to ensure the combiner can handle the maximum power levels without damage or loss of signal quality.
In a MIMO (Multiple Input Multiple Output) system, a double unit multi-band combiner can be crucial because it allows for the simultaneous handling of multiple signals across different frequency bands. This setup ensures effective combining and isolation of signals from various antennas, which is essential for maximizing data throughput and maintaining signal integrity in complex MIMO systems. By using double unit (or called twin unit), each band can be processed independently, enhancing overall system performance and reducing interference between different MIMO channels.
1. Low PIM: Typical third-order PIM of –153 dBc or better, meeting the demands of multi-carrier base station environments.
2. High Band Isolation: ≥ 50 dB isolation between adjacent frequency bands to prevent signal leakage and interference.
3. Low Insertion Loss: ≤ 0.5 dB per band path, preserving signal strength across all combined frequencies.
4. DC Bypass Support: Available on all ports, enabling remote electrical tilt (RET) and AISG compatibility for tower-mount applications.
5. Wide Frequency Coverage: Supports bands from 380 MHz up to 5925 MHz, covering GSM, LTE, NR Sub-6G, and C-Band.
6. Weatherproof Construction: IP67-rated enclosures for outdoor tower and rooftop installations.