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Dive into the research topics where Wing-Le Chan is active.

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Featured researches published by Wing-Le Chan.


asia-pacific microwave conference | 2008

Broadband parallel stubs phase shifter using defected ground structure

S.Y. Zheng; Wing-Le Chan; Kit-Sang Tang; K.F. Man

In this paper, a broadband phase shifter is presented and employs a defected ground structure (DGS) under parallel stubs. Compared with the one without DGS, the proposed design has a wider bandwidth, smaller size and with the very high impedance microstrip lines eliminated. For demonstration purposes, a novel broadband phase shifter using H shaped DGS was designed to operate over a frequency range from 2.2 GHz to 6.1 GHz. It was measured to have insertion loss and phase variation within 2.2 dB and 3.3deg over the desired frequency band.


international conference on industrial technology | 2008

Broadband Butler Matrix optimized using Jumping Genes Evolutionary Algorithm

S.Y. Zheng; S. H. Yeung; Wing-Le Chan; K.F. Man

A broadband Butler matrix with simple structure is presented, consisting of broad band rectangular patch hybrid couplers and novel broad band phase shifters using lambda/8 open and short stubs. Jumping genes evolutionary algorithm is employed to obtain the optimum design. It is measured to have a wide bandwidth of 35.6% centered at 3.65 GHz.


international conference on industrial technology | 2008

Broad band CBCPW phase shifter optimized with Jumping Genes Evolutionary Algorithm

S. H. Yeung; S.Y. Zheng; K.F. Man; Wing-Le Chan

A 45deg microwave phase shifter is optimized for broad band application using jumping genes evolutionary algorithm. The simple structure based on conductor backed coplanar waveguide structure eliminates the air bridges and via holes. The measured insertion loss and phase difference for the two paths are within 0.5 dB and 45degplusmn5deg, respectively, over the frequency band from 3.21 to 4.62 GHz. The measured return loss is found to be better than -10 dB over the operating frequency band.


vehicular technology conference | 2000

Linearised 2 GHz amplifier for IMT-2000

Chi Sun Yu; Wing Shing Chan; Wing-Le Chan

Under large signal conditions, amplifiers using GaAs FETs have high input non-linearity due to the non-linear gate-to-source capacitance C/sub gs/ which will result in AM-PM distortion. The method presented uses a parallel connected varactor diode to linearise a GaAs FET amplifier. A reduction of 10 dB in spectral regrowth at 2 GHz is achieved with a low loss. This method is suitable for circuit miniaturisation and can be applied to amplifiers for IMT-2000.


asia pacific microwave conference | 1997

Spectral regrowth of digital signal through an amplifier using a new linearity method

D. Jing; Wing-Le Chan; C.W. Li

The AM/AM and AM/PM distortion are the dominate nonlinear behaviour of linear power amplifiers. The nonlinear transfer function of the amplifier is expressed as a power series to model the small nonlinear behaviour. Fourier transformation is used to analyse and interpret the origin of the spectral regrowth of digital signals. The amount of spectral growth is analysed using convolution and a new method is proposed which can reduce the spectral regrowth of the digital signal.


Electronics Letters | 2007

Broadband butler matrix with flat coupling

Shao Yong Zheng; Wing-Le Chan; Shu Hung Leung; Quan Xue


Electronics Letters | 2008

Improved broadband dumb-bell-shaped phase shifter using multi-section stubs

S.Y. Zheng; S. H. Yeung; Wing-Le Chan; K.F. Man; Shu Hung Leung


Electronics Letters | 1999

1.9 GHz low loss varactor diode pre-distorter

Chi Sun Yu; Wing Shing Chan; Wing-Le Chan


Microwave and Optical Technology Letters | 2007

Genetic algorithm optimized printed UWB sickle-shape dipolar antenna with stable radiation pattern

Cheong-Fat Chan; S. H. Yeung; Wing-Le Chan; K.F. Man


Microwave and Optical Technology Letters | 2000

2 GHz parallel diode linearized amplifier

Chi Sun Yu; Wing Shing Chan; Wing-Le Chan

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K.F. Man

City University of Hong Kong

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Wing Shing Chan

City University of Hong Kong

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S. H. Yeung

City University of Hong Kong

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Chi Sun Yu

City University of Hong Kong

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S.Y. Zheng

City University of Hong Kong

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Chi Chung Yang

City University of Hong Kong

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Cheong-Fat Chan

The Chinese University of Hong Kong

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Shu Hung Leung

City University of Hong Kong

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D. Jing

City University of Hong Kong

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Kit-Sang Tang

City University of Hong Kong

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