INTERDIGITAL CAPACITOR, INDUCTOR, AND TRANSMISSION LINE AND COUPLER USING THEM

摘要

An interdigital capacitor, an inductor, a transmission line, and a coupler using the same are provided to reduce the size of the inductor without a cutoff frequency and to reduce the size of the coupler by using the small LH(Left-Handed) transmission line with a wide transmission band. An interdigital capacitor(1) includes a first finger set(10) and a second finger set(20). The first finger set has at least two fingers(12,14) which are spaced apart from each other and connected to each other at one end. The second finger set has at least two fingers(22,24) which are spaced apart from each other and connected to each other at one end. The second finger set is spaced apart from the first finger set to be substantially in parallel with the first finger set. The interdigital capacitor further includes a dielectric interposed between the first and second finger sets. A width of the fingers of the first finger set is larger than an interval between the fingers of the second finger set so that the fingers of the first finger set are partially overlapped with the fingers of the second finger set.