Summary
International Symposium on Antennas and Propagation
2009
Session Number:2A3
Session:
Number:2A3-2
Novel Antenna Feeder with Cylindrical Magneto-Material for Antenna Miniaturization
Ji-Chul Lee, Kyeong-Sik Min,
pp.309-312
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
With the advance of wireless communication systems and the appearance of various wireless applications in recent years, the broadband antenna with small size is strongly demanded [l]. The service channels of handy terminal are going to extend toward low frequency band such as the FM radio band (88 MHz ~ 108 W2) and the terrestrial digital multimedia broadcasting band (174.512 MHz ~ 215.504 MHZ). Since it has long wavelength to compare handy terminal size, it is physically difficult to miniaturize the antenna size. In order to solve the above problems, the researches of the miniaturized antenna operated at low frequency have been widely studied. There are some representative examples for antenna miniaturization by special materials such as meta-material substrate [2][3] and Magneto-Dielectric Material (MDM) [4]-[6]. According to the work of R.C. Hansen and M. Burke, it has been proposed the basic concept of antenna operated at low frequency band by application of the magneto-dielectric material as substrate of plate antenna[4][5]. For antenna miniaturization, the research on arti?cial magneto-dielectric loading for improving the impedance bandwidth properties of microstrip antennas has been proposed by Sergei A. Tretyakov team [6]. However, it was appeared the decrease of bandwidth, gain and ef?ciency at above research even though it had been used for the ideal MDM without tangential loss. It is natural phenomena that the MDM antenna has narrow bandwidth and low gain because of high permeability and high permittivity even the antenna size can reduce physically. In order to solve the problem of narrow bandwidth and low gain of the MDM antenna, this paper presents novel antenna feeder with a cylindrical magneto-material (CMM) for antenna miniaturization. Antenna feeder is closed by the CMM assumed the ideal material with tangential lossless. A role of the CMM is to generate a strong current induced by the electro-magnetic field around the feeding metal pin. The generated current is transmitted to antenna radiator.