A　new　type　of　broadband　piezoelectric　ceramic　transducer　is　developed　and　analyzed.　The　transducer　is　composed　of　two　radial　enhanced　composite　vibrators　with　different　resonance　frequencies　stacked　along　the　axial　direction.　Each　vibrator　consists　of　a　piezoelectric　ceramic　stack　polarized　in　the　thickness　direction　and　a　metal　tube,　and　they　are　connected　and　excited　to　vibrate　in　the　radial　direction.　On　the　basis　of　the　radial　vibrations　of　the　piezoelectric　ceramic　thin　ring　and　the　metal　tube,　the　electromechanical　equivalent　circuit　of　the　transducer　is　derived　and　the　input　impedance　of　the　transducer　is　obtained.　The　relationship　between　the　resonance　frequency　and　the　geometrical　dimensions　of　the　transducer　is　analyzed.　The　new　type　of　transducer　is　simulated　using　the　ANSYS　software.　The　simulated　resonance　frequencies　of　the　transducer　are　in　good　agreement　with　the　theoretical　results.　The　transducer　exhibits　broadband　characteristics　because　of　the　double　stacking　of　vibrators　with　different　resonance　frequencies,　and　the　transducer　can　be　driven　under　high　power　because　of　its　radial　enhanced　composite　structure.　©　2018