| 摘要 |
PURPOSE: A differential mode balanced band pass filter is provided to appropriately control the length of a short-circuit stub or an interval of an inter-digital capacitor, thereby providing the balanced band pass filter which has cut-off improvement properties. CONSTITUTION: A balanced CRLH(Composite Right/Left-Handed) transmission line unit cell structure is comprised by interconnecting two short-circuit stubs of a CRLH transmission line unit cell. A balanced CRLH transmission line unit cell(210) of a differential mode is arranged using the two unit cells of an existing CRLH transmission line. A plurality of the differential mode balanced CRLH transmission line unit cells is connected to each other in order to acquire broadband band-pass properties. A series capacitor(CL) and a series inductor(LR) of the unit cell are arranged with an inter-digital capacitor. A parallel inductor(LL) and a parallel capacitor(CR) are arranged with the short-circuit stub.
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