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 specular and dark pixels. Then, to solve this problem and further obtain unmatched area data, this binocular vision system was also used as two camera-projector monocular systems operated from different viewing angles at the same time to fill in missing data of the binocular reconstruction. This method involves producing measurable images by integrating such techniques as multiple exposures and high dynamic range imaging to ensure the capture of high-quality phase of each point. An image-segmentation technique was also introduced to distinguish which monocular system is suitable to reconstruct a certain lost point accurately. Our experiments demonstrate that these techniques extended the measurable areas on the high dynamic range of surface reflectivity such as specular objects or scenes with high contrast to the whole projector-illuminated field.

In this letter, a dual-band magnetoelectric (ME) dipole antenna with wide operation bands is proposed for WiMAX and WLAN applications. A full-metal rectangular director is loaded right above the ME dipole antenna and it resonates at around 3.6 GHz due to the excitation of the long electric dipole (LE-dipole). Then, the lower operation bandwidth is extended significantly. This added director also allows our antenna to work as a quasi-Yagi antenna at specific frequencies, and thus, the proposed antenna is capable to achieve better unidirectional radiation performance and higher gain. In order to satisfy WLAN communication, a short trapezoid electric dipole is designed beneath the LE-dipole, which maintains the overall antenna dimensions as unchanged. Besides, such design strategy avoids the distortion of the radiation pattern at 5 GHz as well. As for the ground, a hornlike reflector is adopted instead of traditional planar structures. The measured results show that our proposed antenna achieves two wide bandwidths, 2.3-3.7 GHz (46.7%) and 5-6.25 GHz (22.2%), and high stable gain (8.5 ± 0.9 and 9 ± 1 dB) within these two operation bands.

Continuous developments in the electronics industry have led to constantly changing career roles and graduate skills requirements. Students in the University of Electronic Science and Technology of China (UESTC) have complained that numerous courses in electronic engineering are heavily focused on theoretical knowledge that is disconnected from the needs of the industry. Thus, in an effort toward delivering student-centered educational programmes that meet the needs of the industry, this article introduces an innovative course that was developed using the project-based learning (PBL) method and situated in the electronic engineering undergraduate programme at UESTC. Since real-world engineering projects require teams to collaborate on ill-defined problems, we focused this innovative course on developing professional and technical skills, drawing from a range of more typical electronic engineering courses. We provide full details of two projects that were created for this PBL approach and evaluate them as practice examples that demonstrate the impact of this practical pedagogic innovation in UESTC. According to our evaluation, completed by all 40 of our enrolled students, our innovative course based on interdisciplinary PBL exercises demonstrated a significant improvement in student satisfaction and 65% of students preferred the interdisciplinary PBL course in comparison to traditional lecture-based courses.

In this paper, a novel wideband Magneto-electric (ME) dipole antenna with flat gain is proposed. The proposed antenna consists of a normal ME dipole antenna element, a substrate-printed director and a horn-like reflector (HLR). The combination of the director and ME dipole antenna element allows the proposed antenna to work as a quasi-Yagi antenna at high frequencies, which enhances its gain and front-to-back ratio (F/B ratio). The director also improves the impedance matching of the antenna, allowing a wide operation bandwidth. Using the degrees of freedom of the HLR one is able to tune the antenna gain in separate frequency bands, opening the possibility to reach the most important characteristic: a very stable gain in a wide frequency range. A prototype was fabricated and measured. The measured -10 dB bandwidth is from 1.6 to 3.8 GHz. Within the designated frequency range (1.7-3.7 GHz, incorporating the operational frequencies for 2G, 3G, 4G, Wi-Fi and WiMax), the measured gain variation is only 0.45 dB.

This paper presents a circuit design and an implementation of a four-channel 12-bit digital-to-analog converter (DAC) with high-voltage operation and radiation-tolerant attribute using a specific CSMC H8312 0.5-μm Bi-CMOS technology to achieve the functionality across a wide-temperature range from -55 °C to 125 °C. In this paper, an R-2R resistor network is adopted in the DAC to provide necessary resistors matching which improves the DAC precision and linearity with both the global common centroid and local common centroid layout. Therefore, no additional, complicated digital calibration or laser-trimming are needed in this design. The experimental and measurement results show that the maximum frequency of the single-chip four-channel 12-bit R-2R ladder high-voltage radiation-tolerant DAC is 100 kHz, and the designed DAC achieves the maximum value of differential non-linearity of 0.18 LSB, and the maximum value of integral non-linearity of -0.53 LSB at 125 °C, which is close to the optimal DAC performance. The performance of the proposed DAC keeps constant over the whole temperature range from -55 °C to 125 °C. Furthermore, an enhanced radiation-hardened design has been demonstrated by utilizing a radiation chamber experimental setup. The fabricated radiation-tolerant DAC chipset occupies a die area of 7 mm × 7 mm in total including pads (core active area of 4 mm × 5 mm excluding pads) and consumes less than 525 mW, output voltage ranges from -10 to +10 V.

In this paper, a dual-band dual-sense circularly polarized (CP) magnetoelectric dipole antenna is proposed. The antenna consists of a cavity reflector, two pairs of vertical and horizontal copper plates, and a crossed Γ-shaped feeding structure. The shorted vertical plates work as quasi-magnetic dipoles (M-dipoles), while the connected horizontal plates work as electric dipoles (E-dipoles). Two M-dipoles and E-dipoles are designed to possess different heights and lengths, and thus they are able to achieve separate operation bands. To generate dualsense CP performance, the M-dipoles and E-dipoles are placed in parallel and the adjacent E-dipoles extend along the opposite directions. Benefiting from the intrinsic 90° phase difference between the M-dipole and E-dipole, the left-hand CP is achieved within the lower operation band (2.15-3.4 GHz) and the righthand CP is achieved within the upper band (4-6.3 GHz). The proposed antenna possesses a unidirectional radiation pattern with high front-to-back ratio (≥22 dB). Furthermore, high gain (≥8 dBi) and radiation efficiency (≥90%) are also achieved.