Improvement on characteristics of Spiral Slot Antenna formed on PCB

Abstract

A lot of planar antennas are used for various electronic equipments made smaller, thinner and lighter. We have proposed to use a spiral slot antenna formed on a printed circuit board. This paper reports on improvements on the gain and side-lobe characteristics of the antenna. TLM method was used for analysis. From the analyses, we found that the maximum gain increased by about 3dB, and the side-lobe level was improved under −20dB, and as the thickness of the substrate decreased, the peak frequency of the gain increased.