Summary
International Symposium on Antennas and Propagation
2012
Session Number:4A3
Session:
Number:4A3-5
A Comparison of Feed Methods for Electrically Small and Low-profile Meander Line Antennas
Yoshiya Saito, Takeshi Fukusako,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
Electrically small and low-profile antennas (ESLA) have been widely studied in recent years. An antenna which is close to a back conductor can reduce the electrical effects from the backing material when installed on IC chips, human body or any metallic or lossy material. However, typical electrically small and low-profile antennas have low radiation efficiency resulting in between difficulty of impedance matching to 50 �?. For designing ESLA, a capacitive feed (C-feed) technique has been proposed by the authors' group previously. Using the C-feed structure, the imaginary part of the input impedance of the antenna can be easily controlled by varying the size of the feed plate which is installed in between the radiating element and ground plane. A modified quarter-wavelength capacitive-feed meander line antenna (QCFMA) has been proposed for gain improvement satisfying ka = 0.435 < 0.5, k: wave number, a: radious of a sphere surrounding the antenna. In this presentation, the QCFMA is compared with the same dimension of meander line antenna with an inverted-F antenna structure (IFMA) in order to evaluate the performance of C-feed structure. As a result, QCFMA shows better radiation characteristics than IFMA.