Title :
A spiral antenna backed by an electromagnetic band-gap material
Author :
Nakano, Hisamatsu ; Ikeda, M. ; Hitosugi, K. ; Yamauchi, J. ; Hirose, K.
Author_Institution :
Fac. of Eng., Hosei Univ., Koganei, Japan
Abstract :
A spiral antenna backed by an electromagnetic band-gap material, referred to as the EBG spiral antenna, has been analyzed using the finite-difference time domain method. The analysis shows that, even though the antenna height is less than one-quarter wavelength, the EBG spiral can radiate a CP wave. The spiral, which supports first mode radiation at 6 GHz, is found to have a frequency bandwidth of 11% for a 3-dB axial ratio criterion. Within this axial-ratio bandwidth, the gain variation is 4.1 dB.
Keywords :
antenna feeds; antenna radiation patterns; finite difference time-domain analysis; frequency response; microstrip antennas; periodic structures; photonic band gap; spiral antennas; circularly polarized component; electromagnetic band-gap material backing; finite-difference time domain method; frequency response; peripheral length; radiation characteristics; spiral antenna; Arm; Conducting materials; Electromagnetic radiation; Electromagnetic reflection; Frequency; Metamaterials; Optical reflection; Periodic structures; Reflector antennas; Spirals;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1220315
