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Since the discovery of carbon nanotubes (CNT) in 1991 by Iijima (Iijima, 1991), the intensive investigations on CNT have shown that CNT has a series of unique mechanical, electrical, magnetic, optical and thermal properties (Poncharal et al, 1999; Mintmire et al, 1992; Wang, et al, 2005; Xu et al, 2006; Zhao et al, 2006). For a completely pure, defect-free state CNT, it is diamagnetic with a large diamagnetic susceptibility spanning more than two orders of magnitude. Generally, there are two categories of CNTs available for various applications: single wall carbon nanotubes (SWCNT) and multiwalled carbon nanotubes (MWCNT). MWCNT consists of two or more concentric cylindrical shells of graphene sheets coaxially arranged around a central hollow core. SWCNT comprises a single graphene cylinder. Such a tube configuration has a so-called electronic conjugate -structure which is responsible for its unique electronic transport behaviors. CNTs have been reported to find new applications in bolometers (Lu et al, 2010); gas pressure sensors (Tooski et al, 2011), nanometer resolution optical probes (Nakata et al, 2011), etc. Recently, there is an increasing interest in the developing materials for electromagnetic engineering applications, such as electromagnetic wave absorbers, antennae, circulators, etc. Especially, as telecommunication systems and electronic devices such as wireless local area networks and antenna system are ushered into the GHz arena, electromagnetic interference (EMI) problems that degrade the performance of electric circuits and communication systems are becoming more and more serious. One solution to these problems is to absorb the unwanted electromagnetic wave using microwave absorbing materials (Han et al, 2010a, 2010b, 2009a, 2009b; Xie et al, 2007; Chen et al, 2010). Since the application of conventional microwave absorbers such as spinel ferrites is restricted in the MHz region due to their Snoek’s limit (Snoek, 1948), researches are urged to explore new types of microwave absorbers that can meet requirements like light weight and strong absorption in a wide frequency range, such as ferrites, metallic nanostructured magnetic materials (such as Fe, Co, Ni and alloys made from them), magnetic microwire, etc. The significant drawback of these materials is their large density, especially for ferrites, which are the most widely used materials for electromagnetic wave absorbers. For instance, the density of ferrites is usually around 45 g/cm3. A CNT/epoxy resin composite is considered a good candidate material for microwave applications due to its lower density

High Frequency Properties of Carbon Nanotubes and Their Electromagnetic Wave Absorption Properties