Wideband monopole antenna tightly aligned to the ground plate

Wideband strip antenna surrounding a ground plate

“…The width W and length L of this proposed antenna are 0.11 λ Low and 0.32 λ Low , and those of the antenna in [23] are 0.08 λ Low and 0.38 λ Low , thus the proposed antenna becomes wider whereas shorter as indicated in the table. The fractional bandwidth of [23] is approximately 93%, and the bandwidth of this proposed antenna is more than 130%. Impedance matching is achieved from 0.2 GHz to 0.6 GHz by both antennas, but matching range from 0.6 GHz to 3.2 GHz is extended by this antenna.…”

“…Table 1 shows the size with which a wideband impedance matching is achieved. The parameters of designs were initially set to the values referring the antennas in [23] and optimized for the infinite dielectric substrate model by using the optimization function of the method of moments software IE3D, and the parameters were adjusted to reproduce the optimized performance for the finite dielectric substrate model by the finite element software Ansys HFSS. Three kinds of antenna designs were compared to investigate the effect of the thickness of the dielectric substrate ( ε r = 2.17, tan δ = 0.0008) with respect to the wavelength.…”

“…Figure 1b shows the geometrical configuration of antennas proposed in [23]. The antenna proposed in this paper is geometrically equivalent to bend the strip of the antenna in [23] twice and extending the tip length l 4 . The stepped section 23 of the antenna proposed in this paper is formed by bending the strip of the antenna in [23] at the feed side of the point where the distance between the strip and the ground plate changes stepwise.…”

“…The feeding side of an L‐shaped strip is located close and parallel to a ground plate to form a stepped slot line in [22]. Instead of L‐shaped strip, a straight strip is employed to make the antenna slim in [23]. The width W and length L of this proposed antenna are 0.11 λ Low and 0.32 λ Low , and those of the antenna in [23] are 0.08 λ Low and 0.38 λ Low , thus the proposed antenna becomes wider whereas shorter as indicated in the table.…”

“…Instead of L‐shaped strip, a straight strip is employed to make the antenna slim in [23]. The width W and length L of this proposed antenna are 0.11 λ Low and 0.32 λ Low , and those of the antenna in [23] are 0.08 λ Low and 0.38 λ Low , thus the proposed antenna becomes wider whereas shorter as indicated in the table. The fractional bandwidth of [23] is approximately 93%, and the bandwidth of this proposed antenna is more than 130%.…”