Abstract

In this chapter, we discuss the situation of general wire structures consisting of more than a single wire. There are many examples of this type of systems. A classic example is the Yagi, or fishbone antenna, which consists of parallel wires of different lengths and separations. Another example is a fractal structure of wires of different lengths which was studied as broadband absorbers. Recent foci are on wires of much smaller dimensions. A collection of straight wires can often mimic the physical properties of rings and helixes and exhibit strong magnetic responses. They are much easier to make on a nanoscale. A recent example is the fishnet structure. Actually, the Yagi antenna also exhibits magnetic responses. A small scale Yagi antenna has recently studied.

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