Abracon has introduced the AFII-LC series of low-pass LTCC ceramic filters designed to improve harmonic suppression and signal integrity in Sub-GHz and 2.4 GHz wireless systems. Housed in an ultra-compact package, the new filter lineup targets space-constrained RF designs used in IoT devices, wireless sensors, and consumer electronics. It also ensures low insertion loss and strong rejection performance to help engineers meet global regulatory standards quickly, enabling faster time-to- approval.
Low-pass LTCC ceramic filters play an important role in RF system design by allowing desired low-frequency signals to pass while attenuating higher-order harmonics and unwanted spectral components. This helps reduce electromagnetic interference and improves signal purity while supporting compliance with global certification requirements from organizations such as the Federal Communications Commission (FCC), European Telecommunications Standards Institute (ETSI), and Association of Radio Industries and Businesses (ARIB). In wireless, IoT, and 2.4 GHz systems, harmonic emissions can lead to out-of-band interference or certification failures if not properly filtered.
Key Low Pass LTCC Ceramic Filters Models Released by Abracon
The AFII-LC series includes four models designed to support both 2.4 GHz and Sub-GHz wireless applications.
For 2.45 GHz systems, the AFII-LC-0083 and AFII-LC-0084 offer approximately 100 MHz bandwidth with insertion loss as low as 0.27–0.38 dB and rejection levels up to 47 dB. For Sub-GHz designs, the AFII-LC-0085 (868 MHz) and AFII-LC-0086 (911.5 MHz) provide passband bandwidth ranging from 20 MHz to 97 MHz, insertion loss down to 0.27 dB, and rejection performance of up to 53 dB. This helps in strongly blocking unwanted interference signals.
All filters are built using multilayer low-temperature co-fired ceramic (LTCC) technology, which enables stable electrical performance and high-Q characteristics across the supported frequency bands. This construction helps minimize signal degradation while maintaining low insertion loss and strong harmonic suppression. By effectively attenuating unwanted spectral components, the filters help improve signal purity and support reliable RF performance in modern wireless systems.
The filters are offered in surface-mount packages for use in PCBs. The 2.4 GHz models are available in 6-SMD no-lead packages measuring as small as 1.0 mm × 0.5 mm, while the Sub-GHz versions use compact 8-SMD no-lead formats. The small footprints allow engineers to integrate harmonic filtering into high-density PCB layouts without significantly increasing board space, making the devices well suited for IoT nodes, wireless sensors, and other compact RF systems.
Click here to learn more about the new AFII-LC series from Abracon.