A co-siting combiner is a passive RF device that combines or separates defined frequency bands so radios or services can share part of an antenna-feeder system while maintaining the required insertion loss, isolation, rejection, power handling, and PIM performance.
They are used at BTS and rooftop sites, tower-sharing systems, neutral-host infrastructure, multi-band antenna systems, and network upgrades where several frequency bands need to coexist on shared feeders or antennas.
RFCOM supplies diplexers, triplexers, quadplexers, pentaplexers, hexaplexers, and custom multi-band combiners. The number in the product family describes the number of separated or combined band paths; it does not by itself define the bands or port arrangement.
A diplexer separates or combines two frequency paths, a triplexer handles three, and higher-order units handle additional defined paths. As the number of bands increases, the band plan, guard space, filter rejection, insertion loss, isolation, power, size, and intermodulation analysis become more important.
Not automatically. A practical design needs enough separation for the required filter transition, rejection, and isolation. RFCOM must review the exact uplink and downlink band edges, duplex mode, carrier bandwidth, transmit power, and required port arrangement. Overlapping bands may require a different architecture and cannot be solved by naming a standard diplexer or multiplexer.
Co-siting systems may carry several high-power signals through the same passive assembly. Intermodulation products can fall into a receive band and affect uplink performance. Low-PIM design and testing reduce this risk, but the complete installation, connectors, jumpers, corrosion, power combination, and band plan must also be reviewed.
Yes, when the bands, duplex modes, power levels, isolation, rejection, PIM requirements, antenna system, and regulatory conditions are compatible. Multi-operator support is a system-design conclusion, not a universal feature of every combiner.
Provide every uplink and downlink band edge, carrier bandwidth, duplex mode, number and direction of ports, transmit power per band, combined power, connector type, insertion-loss target, return loss, isolation, rejection, PIM requirement and test condition, IP rating, mounting, and outline constraints.
RFCOM can review custom band combinations, port arrangements, connector interfaces, power handling, isolation, rejection, PIM targets, environmental ratings, and mechanical layouts. A custom design is confirmed only after the full band plan and system requirements have been reviewed.
