Title :
A New Coupling Mechanism for Circularly Polarized Annular-Ring Patch Antenna
Author :
Lin, Yi-Fang ; Chen, Hua-Ming ; Lin, Shih-Chieh
Author_Institution :
Nat. Kaohsiung Univ. of Appl. Sci., Kaohsiung
Abstract :
A novel coupling technique for circularly polarized annular-ring patch antenna is developed and discussed. The circular polarization (CP) radiation of the annular-ring patch antenna is achieved by a simple microstrip feed line through the coupling of a fan-shaped patch on the same plane of the antenna. Proper positioning of the coupling fan-shaped patch excites two orthogonal resonant modes with 90 phase difference, and a pure circular polarization is obtained. The dielectric material is a cylindrical block of ceramic with a permittivity of 25 and that reduces the size of the antenna. The prototype has been designed and fabricated and found to have an impedance bandwidth of 2.3% and a 3 dB axial-ratio bandwidth of about 0.6% at the center frequency of 2700 MHz. The characteristics of the proposed antenna have been by simulation software HFSS and experiment. The measured and simulated results are in good agreement.
Keywords :
antenna feeds; dielectric materials; electrical engineering computing; microstrip antennas; microstrip lines; permittivity; polarisation; HFSS; circular polarization radiation; circularly polarized annular-ring patch antenna; dielectric material; impedance bandwidth; microstrip feed line; permittivity; simulation software; Antenna feeds; Bandwidth; Ceramics; Dielectric materials; Microstrip antennas; Patch antennas; Permittivity; Polarization; Resonance; Software prototyping; Annular-ring patch antenna; ceramic dielectric material; circular polarization (CP); patch coupling;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2007.912961
