CTS Electronic Components has introduced a surface-mount RF Bandpass Filter for use in LTE-U (unlicensed) and LTE-LAA (licensed assisted access). The CTS UPB550A Bandpass Filter has an insertion loss below 1 dB (0.7 dB typical), while providing over 50 dB rejection across all the major FDD bands. This would enable it to meet the receive sensitivity requirements when co-located with any basestation power class. It is rated for 2W average and 20W peak input power, thereby supporting the full 1W at the antenna allowed for LTE-U/LTE-LAA.
As the most recent member of the universal-footprint family of bandpass filters and duplexers, the UPB family, in a common PCB layout, supports all of the major TDD bands including bands 40, 41, 42, 43 in a compact footprint of 10.2mm long ceramic monoblock. In addition to the UPB550A, CTS has other filters and variants which support UNII sub-bands, 5GHz ISM, or 802.11p including support for systems requiring multiple co-located 5GHz sub-bands.
