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Your search keyword '"Ji, Lu‐Yang"' showing total 31 results
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31 results on '"Ji, Lu‐Yang"'

3. Multiband Modified Yagi Antenna in a Shared Transverse Aperture

Author

Huang, Wuyi, Ji, Lu-Yang, and Zhou, Shi-Gang

Abstract

This letter presents a multiband modified Yagi antenna, which can operate at four individual frequency bands (0.87 GHz, 1.53 GHz, 2.32 GHz, and 5.55 GHz). The proposed antenna consists of four groups of Yagi elements cascading in a shared transverse aperture. Each Yagi element has one dipole as the radiator, one or two directors, and one reflector corresponding to one resonant frequency. In order to realize independent control of each frequency band, a high-impedance structure is employed between two adjacent Yagi elements, which can be used to reduce the mutual coupling as well. Therefore, the four groups of Yagi elements can work individually or in combination to achieve single-band, dual-band, tri-band and quad-band Yagi antennas. The measured results show that the proposed antenna can achieve a −10 dB impedance bandwidths of 11.5% [(0.82 to 0.92) GHz], 10.5% [(1.45 to 1.61) GHz], 17.7% [(2.11 to 2.52) GHz], and 16.2% [(5.1 to 6) GHz] for the four operating bands. The maximum realized gains for each band are 5.8 dB, 7.9 dB, 6.7 dB, and 4.8 dB.

Published
2024
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17. One-dimensional beam-steering Fabry–Perot cavity (FPC) antenna with a reconfigurable superstrate.

Author

Ji, Lu-Yang, Fu, Shuai, Zhang, Lin-Xi, and Li, Jian-Ying

Abstract

In this work, a new reconfigurable discrete 1D beam-steering Fabry–Perot cavity antenna with enhanced radiation performance is presented. It consists of a probe-fed patch antenna printed on the ground plane and a reconfigurable metasurface acting as the upper partially reflective surface to realize beam steering. By utilizing 6 × 6 proposed reconfigurable unit cells on the superstrate, the beam-steering angle can be effectively enhanced from ±7° to ±17° with fewer active elements and a much simpler biasing network. The proposed antenna was fabricated to validate the feasibility. Good agreement between the simulated and measured results is achieved. Moreover, the measured realized gains are over 11 dBi with a gain variation from the boresight direction to the tilted direction <0.2 dBi. [ABSTRACT FROM AUTHOR]

Published
2020
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31. A compact monopolar patch antenna with bandwidth‐enhancement under dual‐mode resonance.

Author

Liu, Neng‐Wu, Sun, Mei‐Jiao, Zhu, Lei, Jia, Zhi‐Hui, Ji, Lu‐Yang, Fu, Guang, and Zheng, Hui‐Li

Subjects
MICROSTRIP antennas, MICROSTRIP transmission lines, ANTENNAS (Electronics), RESONANCE
Abstract

A compact monopolar microstrip patch antenna (MPA) with enhanced‐bandwidth is proposed. In order to achieve the miniaturized patch, the zeroth‐order mode of the MPA instead of its higher‐order modes is employed at first by loading the shorting pin around the center of the patch. After that, a L‐shaped microstrip line with a shorting pin is introduced at the periphery of the patch radiator to excite an additional non‐radiative mode for bandwidth enhancement. In final, the proposed MPA is fabricated and measured. The results illustrate that the antenna generates an enhanced‐bandwidth of about 4.1% ranging from 2.39 to 2.49 GHz, which is significantly larger than that of the traditional MPA around 1%. Meanwhile, the dimensions of the radiating patch are obviously decreased down due to the employment of zeroth‐order mode, which are kept as small as about 0.17 λ0 × 0.22 λ0 × 0.026 λ0 (λ0 is the free‐space wavelength). [ABSTRACT FROM AUTHOR]

Published
2020
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