Quan-yuan Feng

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This paper presents a method that allows a conventional dual-camera structured light system to directly acquire the three-dimensional shape of the whole surface of an object with high dynamic range of surface reflectivity. To reduce the degradation in area-based correlation caused by specular highlights and diffused darkness, we first disregard these highly(More)
A coplanar waveguide (CPW)-fed metamaterial (MTM) antenna using an epsilon negative transmission line (ENG-TL) is presented. The bandwidth characteristics of zeroth-order resonance (ZOR) and first-order resonance (FOR) are analyzed and described using circuit elements based on the ENG-TL theory. The bandwidth enhancement of the MTM antenna can be achieved(More)
This paper presents a new method to extend the bandwidth of metamaterial (MTM) antennas using an epsilon negative transmission line (ENG-TL). The bandwidth characteristics of zeroth-order resonance (ZOR) and first-order resonance (FOR) are analyzed and described using circuit parameters based on the ENG-TL theory. An equivalent circuit model for the FOR is(More)
A novel wideband antenna based on composite right/left-handed transmission line (CRLH-TL) is presented. The bandwidth enhancement of the antenna can be achieved when the zeroth-order and first-positive-order modes are closely spaced and merged together. The uniplanar asymmetric coplanar waveguide (ACPW) is adopted as the host transmission line. The ACPW(More)
In this paper, we propose a multi-beam model for antenna array pattern synthesis (AAPS) problem. The model uses a conic trust region algorithm (CTRA) similarly proposed in this paper to optimize its cost function. Undoubtedly, whole algorithm efficiency ultimately lies on the CTRA, thereof, we propose a method to improve the iterative algorithm’s(More)
A CMOS capacitor-free low-dropout (LDO) voltage regulator with 0.65–1.8V power supply is presented. Positive feedback is used to build the differential computation of the error amplifier and the positive feedback gain is less than unity to ensure the stability. The LDO is designed in TSMC 0.18µm CMOS processes. The maximum output current of(More)
Acquiring a high-accuracy three-dimensional (3D) shape of a large-scale object from multiple uncalibrated camera views remains a big challenge, since a considerable number of images is required to cover the entire surface; the use of multiple images could, however, result in accumulative errors from each processed image. Here error propagation rules in the(More)
A broadband zeroth-order resonant (ZOR) antenna based on asymmetric coplanar waveguide (ACPW) is presented. By adopting the epsilon negative transmission line (ENG-TL), a zeroth-order resonance mode can be achieved. We employ an asymmetric coplanar waveguide structure which offers the design freedom to realize the broadband ZOR antenna, where the antenna’s(More)
In this paper , the problem of excursion in center frequency of Half-Wavelength parallel- coupled line band-pass filter in traditional design is discussed.First  of all , the basic principle of Half-Wavelength parallel- coupled –sesonator filter is introduced,and the reasons for the deviation of center frequency are(More)
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