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Transmission line approach of left-handed (LH) materials and microstrip implementation of an artificial LH transmission line

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2 Author(s)
Caloz, C. ; Electr. Eng. Dept., Univ. of California, Los Angeles, CA, USA ; Itoh, T.

A transmission line (TL) approach of left-handed (LH) materials is proposed. The transmission characteristics of an ideal LH-TL are presented, the constitutive parameters of an equivalent LH material are derived and shown to be negative, and some LH-transmission paradoxes are explained. Next, a method to design an artificial LH-TL in the form of an ideal lumped-elements ladder network is described and illustrated with simulation results. It is shown that, in this line, left-handedness can be achieved without losses over an unlimited bandwidth, from the cutoff of the resulting high-pass filter to infinity, with excellent agreement with theory. Finally, a microstrip implementation of the LH line for microwaves, using interdigital capacitors and stub inductors, is demonstrated, with moderate insertion loss and a broad bandwidth of the order of 100%.

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Antennas and Propagation, IEEE Transactions on  (Volume:52 ,  Issue: 5 )