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Your search keyword '"Zhu, Qinglin"' showing total 16 results
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16 results on '"Zhu, Qinglin"'

3. Design of a new millimeter wave power combiner based on multi-way ridged waveguides

Author

Ning Yuemin, Zhu Qinglin, and Jiang Wanshun

Subjects
Physics, business.industry, Amplifier, Physics::Optics, Astrophysics::Cosmology and Extragalactic Astrophysics, Spatial power combiner, Optics, Broadband, Extremely high frequency, Return loss, Power dividers and directional couplers, Insertion loss, business, Electrical impedance, Astrophysics::Galaxy Astrophysics
Abstract

A new millimeter wave spatial power combiner based on broadband multi-way ridged waveguides is designed. The device is composed of a multi-step impedance transformer and eight ridged waveguides. Since the ridged waveguides provide a consistent impedance transformation and a broad band working frequency, a millimeter wave solid-state power amplifier based on the combiner demonstrates an output power of more than 5 W at 40 GHz and greater than 10 W over the 30 GHz to 34 GHz band. Measured results show that all the ridged waveguides have the high uniformity of amplitude and phase, and the combiner has demonstrated operation over a broadband of 30 GHz to 40 GHz with more than 10 dB return loss and less than 0.8 dB insertion loss.

Published
2013

4. A model for remote sensing sea level with GPS interferometric signals using RHCP antenna

Author

Kang Shifeng, Wang Hongguang, and Zhu Qinglin

Subjects
business.industry, Geodesy, Physics::Geophysics, Interferometry, Interference (communication), GNSS applications, Antenna height considerations, Physics::Space Physics, Global Positioning System, Tide gauge, Antenna (radio), business, Geology, Sea level, Computer Science::Information Theory, Remote sensing
Abstract

Determination of tides using reflected signals is an important aspect of GNSS application technique at the present. For the problem of remote sensing the tide heights, a method of retrieving the height of sea surface is proposed from the power of the interference signals obtained by a coastal GPS receiver with singular antenna. An experiment was carried out at the coast of Qingdao. Results of the receiving antenna height over the sea surface from observed interference signals are presented. Compared to tide gauges, the results show its validity of the method based on GPS interference measurements using right-hand circular polarization antenna.

Published
2012

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