The evolution of 5G technology has enabled massive IoT communications. 3GPP Release 17 introduced the RedCap (Reduced Capability) protocol to supplement medium-to-high-speed IoT capabilities, achieving an ideal balance between cost and performance. Release 18 further simplified it to eRedCap (enhanced RedCap) for easier deployment in medium-speed IoT. After Release 19 proposed the improvement of Passive IoT technology, the full-scenario IoT capabilities of cellular networks began to take shape.
Covering full-scenario and multi-requirement needs has intensified the challenges in device design. Today's IoT devices must support multiple RF channels, sometimes requiring larger bandwidths, while maintaining low power consumption. Meanwhile, all standards and the data they send or receive must avoid interference as much as possible. Thus, the introduction of filters becomes imperative. By promoting the development of integrated modules, smaller filters help design engineers integrate increasingly complex IoT communication modules into miniature devices, addressing coexistence, capacity, and range issues in RF systems.
