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.