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Metamaterial Loads Provide Compact Matches (.PDF Download)

A high-impedance tunable composite right/left-handed (CRLH) coplanar-waveguide (CPW)  transformer provides an effective means of matching a 200-Ω load to a 50-Ω line. By applying DC magnetic bias, it is possible to tune the bandwidth of the transformer, with the center frequency changing from 2.8 to 3.4 GHz.

With a length of 2.4 mm, this transformer represents about a 78% reduction compared to a conventional transformer in the same frequency band. The CRLH transformer’s CPW

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