a dual mode ceramic filter has an enclosure with two cavities separated by a wall , and two tm dual - mode resonators , each tm dual - mode resonator positioned in a corresponding cavity . each tm dual - mode resonator has first and second modes , and a body having a central portion with a plurality of arms extending outwardly from the central portion . the filter also has two input conductive members , each input conductive members positioned in a corresponding cavity . each input conductive member is disposed proximate a corresponding tm dual - mode resonator for coupling between the input conductive member and the tm dual - mode resonator .