In the era of 3G and 4G, metal cavity filters have become the mainstream choice in the market due to their lower cost and more mature technology. However, in the 5G era, as the number of base station channels increases and the frequency of communication radio waves increases, traditional antenna solutions cannot achieve the spectrum efficiency of 5G, and 5G base stations rely on Massive MIMO technology to require more antenna support, and miniaturized filters will become a rigid demand. . Dielectric 4G/5G communication filter
will have a broader market prospect than metal coaxial cavity filters. At present, ZTE and Nokia mainly use small metal cavity filters, while Huawei and Ericsson mainly use ceramic dielectric filters.
The filter has always been an important part of radio frequency signal processing, and it has been increasing with the increasing usage of the communication era. There are 5 communication frequency bands for 3G networks, and 52 bands are added to 4G LTE. In the 5G era, this number will increase to more than 60.
In electronic equipment that operates at high frequencies, radio frequency filters include surface acoustic filters (SAW), bulk acoustic wave filters (BAW), MEMS filters, IPD, and so on. At present, SAW filters and BAW filters are the mainstream filters for mobile phone applications.
SAW filters are widely used in 2G and 3G receiver front ends, duplexers and receiver filters. SAW 4G/5G communication filter
have the characteristics of low insertion loss, high rejection and broadband, and are also very small compared to traditional cavity filters and ceramic filters. The SAW 4G/5G communication filter
is made on a wafer and has the advantage of low cost in mass production.