As Wi-Fi and wireless IoT technology spreads throughout multiple industries, including automotive, communications, industrial, and healthcare markets, a number of challenges arise concerning the large numbers of nodes and their eventual competition for bandwidth and signal integrity.
Key challenges to Wi-Fi and IoT systems include, sensitivity. minimizing front-end losses, harmonic interference, other “service” interference (e.g. cell phone, 5G, LTE).
SAW/BAW filters are frequency filters that are suited from sub-GHz to 7.0 GHz, and they are needed to protect the service or signal from interferers and ensure that wanted signal will be forwarded to the receiver input or the antenna. Acoustic wave (SAW) filters and bulk acoustic wave (BAW) filters provide a filtering function for RF signals at defined frequencies. By using SAW and BAW filters, interferers can be suppressed, and the sensitivity and reliability of receivers can be enhanced. In transmitting systems, SAW and BAW filters provide suppression of unwanted emissions and help fulfilling international standards such as FCC or ETSI
A SAW/BAW filter offers better protection of the service compared to other frequency filters such as LC or ceramic filters because of the higher selectivity. The signal is more efficiently transmitted to the receiver input or the antenna due to the lower insertion loss. In transmit RF systems SAW/BAW filters suppress the radiation of undesired harmonics. In receive paths SAW/BAW filters improve the selectivity of the front-end. Image frequencies are rejected, and powerful out-of-band interfering signals are blocked.
- Learn about RF interference and coexistence issues and solutions
- Identify power handling and band edge solutions
- Discover diplexing and integration options