In this paper, a bow-tie quasi-Yagi antenna with a modified ground plane structure is proposed for wideband characteristics. The ground plane structure of the proposed antenna improved the impedance-matching characteristics by inserting a parallel plate ground with a width equal to the parallel-coupled feed line width. This simply modified ground plane structure can lead to an improvement in impedance matching by additional inductance, capacitance, mutual inductance, and mutual capacitance components. The proposed antenna has a −10-dB reflection coefficient fractional bandwidth of 30 % and a realized gain of 7.7 dBi at the center frequency.
In this study, an electrically small 3-stage monocone antenna with wideband characteristics is proposed. The proposed antenna consists of a 3-stage monocone radiator, a circular disk located above the radiator, shorting pins connecting the circular disk and the ground plane, and parasitic structures. The impedance matching characteristics in the high-frequency band are improved by dividing the monocone radiator into three stages. The insertion of a slot in the circular disk improves the mid-frequency band performance. The low-frequency band is expanded by using shorting pins. In addition, by attaching parasitic structures to the ground plane, the impedance-matching characteristics in the mid-frequency band are further improved. The proposed antenna has a −10 dB impedance bandwidth ranging from 0.98 to 11.1 GHz and a monopole-like radiation pattern.
This study proposes a design of a wideband shark-fin antenna that operates in the sub-6 GHz band for 5G communication. A wideband shark-fin antenna is a multiple-input-multiple-output antenna consisting of two antenna elements. For operation in the 4G and 5G operation bands, wideband characteristics were implemented using a coupler and a half-lambda loop pattern. The manufactured wideband shark-fin antenna satisfied the condition VSWR<3.5:1 in the 4G and 5G operating bands. The average gains over the operating bandwidth were greater than −1.97 dBi, indicating that the shark-fin antenna had excellent radiation characteristics.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.