Journal of Xidian University

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Design of a novel miniaturized broadband microstrip antenna

ZHENG Gengqi;SUN Baohua   

  1. (Science and Technology on Antennas and Microwave Lab., Xidian Univ., Xi'an 710071, China)
  • Received:2016-09-02 Online:2017-08-20 Published:2017-09-29


The method of broadening the bandwidth of the low-profile single patch antenna is studied. A novel rectangle-shape broadband signal patch antenna using the dumbbell-shape Defect Ground Structure (DGS) is proposed in this paper. The antenna consists mainly of the rectangle patch and two surrounding parasitic patches with a C-shaped slot. The resonance characteristics of the parasitic patches are analyzed to determine the dimension of the parasitic patches, and then taking advantage of the gap in etching and DGS, the bandwidth of the antenna is widened. This patch antenna is calculated by Ansoft HFSS. The results validate the proposed approach, which helps the improvement of the bandwidth of the antenna from 500MHz to 1000MHz. Compared with the typical microstrip antenna, the proposed antenna is compact in size, light in weight, and low in longitudinal dimension. The designed antenna is suitable for the design of an array to reduce the coupling among array elements. The substrate of the antenna is the signal layer RF4, and it can be applied in industrial production expediently.

Key words: microstrip antenna, parasitic patch, defect ground structure, miniaturized broadband