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14 results on '"Ruan Cheng-li"'

1. A planar folded ultrawideband antenna with gap-loading

Author

Qu, Shi-Wei, Ruan, Cheng-Li, and Xue, Quan

Subjects
Antennas (Electronics) -- Design and construction, Antennas (Electronics) -- Analysis, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A novel ultrawideband planar gap-loaded folded antenna is proposed in this paper, which is derived from an ordinary three-wire folded antenna with the gap-loading technique. The fabricated monopole antenna has a small electrical size and a measured bandwidth of 8.8:1 ranging from 1.48 to 13 GHz. The operating principles of the proposed antenna, including the excitation of three main resonant modes and their effects on the return loss, are analyzed. The proposed antenna exhibits a relatively stable radiation pattern, as proved experimentally in the paper. In the end, the parametric studies are performed for practical applications. Index Terms--Broadband antenna, folded antenna, gap loading, planar antenna.

Published
2007

2. Development of photoconductive switch and its applications

Author

Lin Weigan, Ruan Cheng-li, and Yuan Nai-chang

Subjects
Optics, Materials science, Photoconductive switch, business.industry, law, Photoconductivity, Picosecond, Waveform, Optoelectronics, Electrical and Electronic Engineering, Radar, business, law.invention
Abstract

The picosecond photoconductive switches are developed and used to detect the pulse laser waveform. By using the photoconductive switches, an novel lab model of ultra-wide band(UWB) radar is also developed. The experimental results are given to show the performances of the switches and the UWB radar.

Published
1995

13. PROPAGATION PROPERTIES OF A PLASMA WAVEGUIDE IN A FINITE MAGNETIC FIELD

Author

Lin Weigan, Ruan Cheng-li, and Hu Bin-Jie

Subjects
Physics, Optics, Condensed matter physics, Physics::Plasma Physics, business.industry, Plasma parameters, Physics::Space Physics, General Physics and Astronomy, Waveguide (acoustics), Plasma, business, Magnetic field
Abstract

The propagation properties of a plasma waveguide in a lossy material under a finite magnetic field are analyzed,particularly for the variations of their propagation constants with plasma parameters,surrounding material and external magnetic field.The analysis show that the propagation properties of such a magnetized plasma-filled waveguide are easy to be controlled compared with those of plasma waveguide to which no external magnetic field or an infinite external magnetic field is applied.

Published
1998

14. BACKSCATTERING OF ELECTROMAGNETIC MISSILES BY A PERFECTLY CONDUCTING CYLINDER WITH ARBITRARY CROSS SECTION

Author

Wen Gb-Yi, Lin Weigan, and Ruan Cheng-li

Subjects
Cross section (physics), Engineering, Missile, Optics, business.industry, Mathematical analysis, General Physics and Astronomy, Cylinder, Point (geometry), Specular reflection, business, Curvature, Energy (signal processing)
Abstract

In this paper, we present a general study on backscattering of electromagnetic (EM) missile by a perfectly conducting cylinder of arbitrary cross section. We find that, when an EM missile with energy decreasing as r-ε(0 -εR/(2r + R), where R is the radii of curvature at tie specular point of the target.

Published
1992

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