A wideband triangular shaped patch antenna with folded shorting wall

Microstrip antennas offer a number of attractive advantages and some designs enhancing the bandwidth were proposed in the literature, such as adding parasitic patches, or using L-shaped probe coupling. Techniques of shorting pin and shorting wall are used to reduce the patch size or to get good matching in the structures. In this paper, a folded shorting wall is introduced to the antenna structure to take the place of the pair of shorting pin and shorting wall and achieve bandwidth enhancement. Furthermore, by modifying the shape of the patch, a very wideband patch antenna has been achieved. 30.5% bandwidth of simulated result and 28. 1% bandwidth of measured result have been achieved, which represents an enhancement of 54.5% compared to the design in W.C. Mok et al (IEE Proc. Microwave, Antennas & Propag., vol. 150, no. 1, pp. 56-60). The main parameters that affect the antenna bandwidth performance are given in detail. The effect of the shorting technique for a quarter-wave patch is studied and a modified patch shape and shorting wall is presented. With the folded shorting wall, a stable gain of 5.5 dBi is obtained over the matching bandwidth. Radiation patterns are presented Thus the folded shorting wall as a suitable patch geometry appears to be a better bandwidth enhancement technique than the previous method of utilizing the pair of shorting wall and shorting pin.