<p>PURPOSE: The band-stop filter obtains the pass band of broadband by effectively controlling the generation of different parasitism the resonance mode. CONSTITUTION: A resonance rod(30) is located in the accommodation space(14) of the inside of the housing(10). At least a part of the top end portion in the forming process of the accommodation space in the inside width of the accommodation space is more composed than the bottom part in the form of the narrow multi-stage.</p>
