A High-gain Wideband Sinuous Antenna Loaded with Lens and Cone-shaped Reflective Backplate

Zhang, Xiaolin; Chen, Kun; Liang, Zhi-Yi; Liu, Lei; Wang, Zhengbin

doi:10.1109/icmmt55580.2022.10022783

Cited by 1 publication

(1 citation statement)

References 7 publications

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“…Notably, previous studies have explored sinuous antennas with wide bandwidth characteristics [22][23][24]27,28,37]. Other research groups have used lenses to achieve high gain [38,39] or improved the cross-polarization isolation of the antenna [40]. However, they all obtained narrower bandwidths than our proposed antenna or still required large electrical lengths.…”

Section: Experiments and Discussionmentioning

confidence: 88%

Miniaturization and Bandwidth Enhancement of Fractal-Structured Two-Arm Sinuous Antenna Using Gap Loading with Meandering

Kim,

Keun,

Yoo

et al. 2023

Fractal Fract

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A sinuous antenna is a frequency-independent antenna known for its wide bandwidth and consistent gain, which makes it valuable in broadband applications such as ultrawideband (UWB) radar and ground-penetrating radar (GPR). However, sinuous antennas tend to be rather large. Consequently, numerous studies have explored miniaturization methods, with the gap-loading method emerging as a prominent approach. Unfortunately, it is still difficult to achieve broad bandwidths for conventional miniaturized sinuous antennas. In this paper, we use a novel approach incorporating a meander shape into the sinuous curve and employing gap loading with meandering. This innovative technique results in the development of a fractal-structured two-arm sinuous antenna characterized by an ultra-compact size and significantly expanded bandwidth. Adding a meander line in the outermost part maximizes the capacitance, thereby enhancing the gap-loading effect and minimizing the overall size of the sinuous antenna. In addition, the introduction of an inner meander line increases the inductance, contributing to a further expansion of the antenna’s bandwidth. For example, the electrical length of the antenna without the meander line is 0.552 × 0.552 × 0.052 λg3, while the electrical length of the antenna with the meander line is only 0.445 × 0.445 × 0.036 λg3, i.e., 19.4% smaller. The antenna lacking the outermost meander line exhibits a 10 dB impedance bandwidth, spanning from 0.74 to 10.53 GHz. In contrast, the antenna featuring the outermost meander line has a 10 dB impedance bandwidth, extending from 0.51 to 10.72 GHz, which results in a remarkable enhancement in the fractional bandwidth (by 8.1%). Hence, the proposed antenna design is a good candidate for broadband applications that require miniaturization.

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