Title :
A small size circularly polarized annular microstrip antenna
Author :
Tamakuma, K. ; Iwasaki, H.
Author_Institution :
Fac. of Syst. Eng., Shibaura Inst. of Technol., Saitama, Japan
Abstract :
A circularly polarized antenna with a low profile, small size, and light weight is required in mobile communication and wireless LAN systems. The purpose of this paper is to propose a small size circularly polarized annular microstrip antenna with a strip line in the inner circle. The proposed annular patch antenna can achieve circular polarization without the need for a 90/spl deg/ hybrid coupler. The calculated results using an electromagnetic simulator are described to demonstrate the usefulness of the proposed antenna configuration. Good impedance and axial ratio characteristics are realized.
Keywords :
electromagnetic wave polarisation; microstrip antennas; microstrip lines; mobile communication; wireless LAN; annular microstrip antenna; circular polarization; circularly polarized antenna; inner circle strip line; mobile communications; patch antenna; small size microstrip antenna; wireless LAN systems; Antenna feeds; Bandwidth; Broadband antennas; Finite element methods; Impedance; Microstrip antennas; Mobile antennas; Patch antennas; Polarization; Slot antennas;
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.2003.1219336
