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468 results on '"Ran, Lixin"'

61. Experimental realization of a one-dimensional LHM-RHM resonator

Author

Li, Yan, Ran, Lixin, Chen, Hongsheng, Huangfu, Jiangtao, Zhang, Xianmin, Chen, Kangsheng, Grzegorczyk, Tomasz M., and Kong, Jin Au

Subjects
Resonators -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

We present the experimental realization of a one-dimensional left-handed/right-handed resonator. The left-handed (LH) part of the resonator is formed by a solid-state-like metamaterial composed of [OMEGA] metallic structures, while the right-handed part is just air. The resonant behavior is successfully observed and an acceptable Q value is obtained. Through phase measurement, we verify that the LH metamaterial layer acts as a phase compensator. Further proof is given by varying the thicknesses of both layers simultaneously to achieve the same resonant frequency under the limitation of total phase difference less than 2 [pi], which is a criterion dramatically different from traditional cavity resonators. Index Terms--Left-handed metamaterials (LHMs), resonator.

Published
2005

94. Orientation and cancellation of directional interfering signals based on a radio frequency beamforming array

Author

Ran Lixin, Jiangtao Hangfu, Changzhi Li, Dexin Ye, and Jialong Chen

Subjects
Beamforming, Engineering, business.industry, 020206 networking & telecommunications, 02 engineering and technology, Linear array, Sensor array, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Signal processing algorithms, 020201 artificial intelligence & image processing, Multiple signal classification, Radio frequency, business, Adaptive beamformer
Abstract

In this work, a cost-effective radio frequency (RF) beamforming array is used to orient and suppress directional interfering signals. With this frontend, both the multiple signal classification (MUSIC) algorithm used in direction-of-arrival (DOA) estimation and the optimizaoion based power inversion (PI) algorithm used to suppress the interfering signal can be significantly simplified. With a RF output, the proposed frontend can be directly connected to existing receivers with RF inputs. Simulations and experiments of a 5-element linear array verified the effectiveness of the proposed approach, showing the potential in practical applications.

Published
2017

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