| 摘要 |
A band-pass filter (11) includes a metal film (13) provided on a dielectric body (12). The shape and size of the metal film (13) and the coupling points of input-output coupling circuits (15,16) are selected such that first and second resonance modes are generated. The metal film (13) has protruding portions (13e,13f) or concavities (13h,13g) provided thereon such that resonance electric field strength in the first or second resonance mode is controlled to couple the first and second resonance modes to each other. <IMAGE> <IMAGE>
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