Quantic PMI Model BPF-3R55G-500M-SFF is a bandpass filter with a center frequency of 3.55 GHz with a bandwidth of 0.5 GHz; rejection @ 3 GHz of 40 dBc minimum; maximum insertion loss of 1.9 dB and a maximum VSWR of 1.5:1. Package size is 0.99" x 0.47" x 0.35" and is outfitted with SMA connectors.  https://www.quanticpmi.com/product-details/bpf-3r55g-500m-sff