Broadband Circularly Polarized Antenna Design with arasitic U-slot and Rectangular Aperture
Date Issued
2009
Date
2009
Author(s)
Yu, Ming-Je
Abstract
This thesis presents the design of broadband circularly polarized antenna with parasitic U-slot and rectangular aperture in PCB structure. The antenna configuration consists of a U-slot, a rectangular aperture, and a backed reflector fed by a microstrip transmission line. The parasitic U-slot determines the upper band resonance while the rectangular aperture dominates the lower frequency band. Combining the U-slot and rectangular aperture with closed resonant bands, we can achieve the wideband CP operation. We describe the design details through the parametric study. In addition, a reflector is placed under the radiating element to achieve unidirectional radiation pattern. At last, we propose a two-element structure as a dual version of the proposed antenna that may further improve the bandwidth and stability of radiation patterns. By the symmetry of antenna geometry, the dual magnetic currents may generate more symmetric radiation patterns than the single element. The proposed antennas are successfully designed, implemented, and measured. Promising antenna performances are achieved, including 10-dB return loss bandwidth of 23.8% and 3-dB axial ratio bandwidth of 21.8%, covering the entire band of 5~6GHz for IEEE 802.11a WLAN System.
Subjects
Circularly polarized antenna
reflector
slot antenna
Type
thesis
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