HD-12: Recent Progress in Low-profile Natural and Metamaterial-based Antennas

Hisamatsu Nakano

Sunday, July 19, 08:00 - 12:00


This short course presents recent progress in low-profile antennas. The inherent characteristics of compactness, low aerodynamic resistance, and durability make low-profile antennas attractive for use in modern communication systems, particularly mobile systems and earth-satellite communication systems. Designing a low-profile antenna brings with it a unique challenge – overcoming the inherent tendency for antenna performance to decrease as the height is decreased. Traditionally, this hurdle has been overcome using variations on common antenna elements, such as the loop, patch, spiral and helix. This short course describes the next generation of low-profile antennas; antennas which use novel elements and take advantage of new concepts in antenna implementation, such as metamaterials.

The short course is composed of three chapters. Chapter 1 summarizes the analysis methods for lowprofile natural and metamaterial-based antennas. The N1, N2, N3, N4, and N5 integral equations, their analysis using the method of moments, and the locally one-dimensional FDTD method are briefly described. In addition, an equivalent-circuit representation for metamaterial-based antennas is presented. Chapter 2 presents the following natural antennas: (N1) Tri-band inverted LFL card antenna, (N2) Planar monopole UWB card antenna, (N3) Crossed wire and plate antennas as a wideband base station antenna, (N4) Reconfigurable two- and four-leaf antennas, (N5) Reconfigurable eight-beam antenna, and (N6) Tilted single- and dual-beam antenna systems with an inhomogeneous plate. Chapter 3 discusses the following metamaterial-based antennas: (M1) Advanced line antenna, (M2) Loop antennas excited in balanced- and unbalanced mode for linearly polarized radiation, (M3) Loop antennas with and without dielectric slabs for counter circularly polarized dual-band radiation, (M4) Two-arm spiral antennas excited from inner- and outer-terminals for counter circularly polarized dual-band radiation, and (M5) Helical antenna for counter circularly polarized dual-band radiation. Note that chapter 3 includes the radiation characteristics when the antenna height is approximately 1/100 of the wavelength at the lowest operating frequency.


Hisamatsu NAKANO (IEEE Life Fellow) has been a faculty member of Hosei University since 1973, where he is now a Professor in the Electrical and Electronics Engineering Department. His research topics include numerical methods for low- and high-frequency antennas and optical waveguides. He has published over 300 articles in major refereed journals and is the author or co-author of eight books.

In 1994, he received the IEEE Transactions on Antennas and Propagation Best Application Paper Award (H. A. Wheeler Award). He also received the IEEE Antennas and Propagation Society Chen-To Tai Distinguished Educator Award, in 2006. More recently, in 2010, he received the Prize for Science and Technology from Japan’s Minister of Education, Culture, Sports, Science, and Technology.

Prof. Nakano has served as a member of AdCom (2000-2002) and a Region 10 representative (2004-2010) of the IEEE Antennas and Propagation Society. He is an associate editor of several journals and magazines, such as Electromagnetics, IEEE Antennas and Propagation Society Magazine, and IEEE Antennas and Wireless Propagation Letters.