Design and Implementation of Conductor-Backed CPW Fed Planar Log-Periodic Antennas
Date Issued
2007
Date
2007
Author(s)
Yang, Yi-Cheng
DOI
zh-TW
Abstract
Theoretically, the log-periodic dipole antenna is a linearly polarized frequency independent antenna type with stable gain patterns. In this thesis, we investigate and propose a new design of the planar log-periodic dipole antenna. The planar PCB log-periodic dipole antenna was proposed recently, however the cross-polarization isolation performance is not sufficient. In this study, we conquer this problem by using a stripline type feeding structure with shielding ground plane to improve the cross polarization isolation performance. In addition, we extend the design with a conductor-backed coplanar waveguide transmission line to realize the fully planar feeding structure. The proposed antenna is successfully simulated, built, and tested with the broadside gain about 1dBi and cross polarization isolation about 20dB around broadside in the 1~5GHz band. A good agreement is achieved between the measured performances and the simulated results. At last, we employ a slanted reflector to improve the antenna gain performance up to 4dBi with a preferred unidirectional pattern.
Subjects
覆背式共面波導
對數週期天線
Conductor-Backed CPW
Log-Periodic Antennas
Type
thesis
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