A low profile stepped wideband monocone antenna

A novel low profile wideband monocone antenna with low cost printed circuit board (PCB) fabrication technology is proposed. Step structures are proposed to simulate the cone structure of traditional monocone antennas, based on three stacked layers of PCB with equal height. The monopole-like radiation patterns and the input reflection coefficients below −10dB are achieved from 2.06GHz to 7.36GHz. Techniques like applying the shorting pins and the annular ring are used to decrease the lowest working frequency. The thickness of the proposed antenna is reduced to only about 0.06λ0 at the lowest frequency. The ripples in the H-plane pattern is always below 0.5dB.