Planar Monolithics (PMI) Model JTIDS-0002 is an ultra-small band reject filter centered at 1.09 GHz that rejects frequencies from 0.96 to 1.22 GHz and was specifically designed for Military JTIDS applications. Package size is 1.5" x 0.5" x 0.5" with SMA female connectors.  https://www.pmi-rf.com/product-details/jtids-0002