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Plenary Speaker - Prof. Hisamatsu Nakano



Prof. Hisamatsu Nakano

Hosei University

Title

Recent Progress in Circularly Polarized Meta Antennas

Abstract

Antennas are categorized as either natural or metamaterial (MTM) antennas. The former have an electromagnetic property found in nature, i.e., a right-handed property, and the latter have an electromagnetic property not existing in nature, i.e., a left-handed property or a composite (right- and left-handed) property. This talk presents recent progress in MTM antennas: a metaline antenna, a metaloop antenna, a metaspiral antenna, and a metacurl antenna. Note that these MTM antennas have a low-profile structure on the order of l/100 wavelength.

Firstly, a characteristic of the metaline antenna is described, where circularly polarized (CP) beam-scanning with change in frequency is realized. An array of bent metalines that realizes CP beam scanning is also described. Secondly, an analysis of the metaloop antenna is presented, revealing that it possesses a counter CP dual band characteristic, i.e., left-handed CP radiation across a specific frequency band and right-handed CP radiation across a different frequency band. Thirdly, the metaspiral antenna is discussed, focusing on its CP beam-scanning capability in both the azimuth and elevation planes. Fourthly, the metacurl antenna is explored, showing that the antenna can radiate both a left-handed CP wave and a right-handed CP wave, each with the same maximum gain.

Biography

Prof. Hisamatsu Nakano has been with Hosei University since 1973, where he is currently an Honorary Professor and a Special-appointment Researcher with the Electromagnetic Wave Engineering Research Institute attached to the graduate school. He has published over 370 articles in peer-reviewed journals and 12 books/book chapters, including "Low-profile Natural and Metamaterial Antennas (IEEE Press-Wiley, 2016)." His significant contributions are the development of five integral equations for line antennas in free space and printed on a dielectric substrate, the invention of an L-shaped wire/strip antenna feeding method, and the realization of numerous wideband antennas, including curl, metaspiral, metahelical, and Body of Revolution antennas. His other accomplishments include design of antennas for GPS, personal handy phones, space radio, electronic toll collection, RFID, UWB, and radar. He received the H. A. Wheeler Award in 1994, the Chen-To Tai Distinguished Educator Award in 2006, and the Distinguished Achievement Award in 2016, all from the IEEE Antennas and Propagation Society. He was also a recipient of The Prize for Science and Technology from Japan's Minister of Education, Culture, Sports, Science and Technology in 2010. Recently, he was selected as a recipient of the Antenna Award of the European Association on Antennas and Propagation (EurAAP) in 2020. Most recently, he was selected by the Japanese government as a recipient of The Order of the Sacred Treasure, Gold Rays with Neck Ribbon on November 3 (Japan Culture Day), 2023.


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