Due to the close proximity of many newly allocated frequency bands to existing ones, managing temperature drift becomes particularly important. At the same time, Carrier aggregation (CA) is also developing rapidly. Cellular service providers can combine up to five carrier channels to improve network performance, of which accurate filtering is a prerequisite.
To address temperature issues, the RF industry is developing low drift and drift free filter technologies. Surface acoustic wave (SAW) and bulk acoustic wave (BAW) filters can still maintain a highly stable performance when the temperature changes, which can meet the stringent performance requirements of emerging equipment.
As mentioned earlier, the next generation of high-end smartphones also needs to be equipped with more filters. Similar to all other components of RF, the space left for the filter is very limited. Engineers must be able to integrate multiple filters into smaller spaces in order to achieve higher performance.
Duplexers, triplers, quadruplers, and even hexamers are collectively referred to as multiplexers. Multiplexers can integrate multiple filters into one device, helping designers save space, simplify design, meet performance requirements, and avoid interference.
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