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2 results on '"Zhong-Liang Lu"'

1. Study on Millimeter-Wave Vivaldi Rectenna and Arrays with High Conversion Efficiency

Author

Guan-Nan Tan, Xue-Xia Yang, Huan Mei, and Zhong-Liang Lu

Subjects
Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Cellular telephone services industry. Wireless telephone industry, HE9713-9715
Abstract

A novel Vivaldi rectenna operated at 35 GHz with high millimeter wave to direct current (MMW-to-DC) conversion efficiency is presented and the arrays are investigated. The measured conversion efficiency is 51.6% at 35 GHz and the efficiency higher than 30% is from 33.2 GHz to 36.6 GHz when the input MMW power is 79.4 mW. The receiving Vivaldi antenna loaded with metamaterial units has a high gain of 10.4 dBi at 35 GHz. A SIW- (substrate integrated waveguide-) to-microstrip transition is designed not only to integrate the antenna with the rectifying circuit directly but also to provide the DC bypass for the rectifying circuit. When the power density is 8.7 mW/cm2, the received MMW power of the antenna is 5.6 mW, and the maximum conversion efficiency of the rectenna element is 31.5%. The output DC voltage of the element is nearly the same as that of the parallel array and is about half of the series array. The DC power obtained by the 1 × 2 rectenna arrays is about two times as much as that of the element. The conversion efficiencies of the arrays are very close to that of the element. Large scale arrays could be expended for collecting more DC power.

Published
2016
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2. Metamaterial loaded vivaldi antenna with high gain and equal beamwidths at KA band

Author

Xin-Sheng Jiang, Zhong-Liang Lu, Xue-Xia Yang, and Guan-Nan Tan

Subjects
Materials science, business.industry, 020208 electrical & electronic engineering, 020206 networking & telecommunications, 02 engineering and technology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Microstrip, Electronic, Optical and Magnetic Materials, Radiation pattern, law.invention, Split-ring resonator, Beamwidth, Optics, law, 0202 electrical engineering, electronic engineering, information engineering, Ka band, Electrical and Electronic Engineering, Antenna gain, Reflection coefficient, business, Vivaldi antenna
Abstract

A high gain and broadband Vivaldi antenna with end-fire and equal beamwidth radiation pattern at Ka band is presented in this paper. The Vivaldi slot is fed by the microstrip line-to-substrate integrated waveguide (SIW) transformer. The SIW transmission performance is enhanced by another row of metal vias beside the original one. On both sides of the Vivaldi conductor planes, 8 parallel slots with gradually increasing length are etched to improve the front-to-back ratios. Under the microstrip feed line, three pairs of split ring resonators (SRRs) are etched on the ground to suppress the secondary harmonic. In order to improve the antenna gain and obtain the equal E- and H-plane beamwidths, the special designed zero-epsilon metamaterial (ZEM) units are loaded on the Vivaldi slot with a maximum gain increment of 3.4dB being obtained. The antenna exhibits a broad bandwidth of 38.5% at 35GHz ranging from 26.5GHz to 40GHz with the reflection coefficient less than −10dB, and the gain varying between 9.7dBi and 12.2dBi. The proposed antenna is fabricated and measured to validate the design. The measured results are in good agreement with the simulated ones. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2337–2341, 2016

Published
2016

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