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J Electromagn Eng Sci > Volume 13(4); 2013 > Article
Journal of Electromagnetic Engineering and Science 2013;13(4):214-223.
DOI: https://doi.org/10.5515/JKIEES.2013.13.4.214   
Design for Triple Band Patch Array Antenna with High Detection Ability
In-Hwan Kim, Kyeong-Sik Min
Department of Radio Communication Engineering, Korea Maritime University
Abstract
This paper proposes a theoretical analysis of hidden device detection and a design of multiband circular polarization patch array antenna for non-linear junction detector system application. A good axial ratio of circular polarization patch antenna is realized by a new approach that employs inclined slots, two rectangular grooves and a truncated ground for the conventional antenna. A good axial ratio of the 1.5 dB lower is measured by having an asymmetric gap distance between the ground planes of the coplanar waveguide feeding structure. The common ground plane of the linear array has an optimum trapezoidal slot array to reduce the mutual coupling without increasing the distance between the radiators. The higher gain of about 1 dBi is realized by using the novel common ground structure. The measured return loss, gain, and axial ratio of the proposed single radiator, as well as the proposed array antennas, showed a good agreement with the simulated results.
Key words: Circular Polarization, Multiband Antenna, Non-linear Junction Detector, Patch Array Antenna, Trapezoidal Slot Array

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