提出了一种采用基片集成同轴线(SICL)馈电的双馈点圆极化微带贴片天线.具体通过多馈点法实现圆极化,并通过背腔加载提高增益,增加带宽,减小后瓣,降低互耦,提高天线性能.经过仿真验证,该天线能够在42.42～56.69 GHz之间实现S11

In this article, a novel printed dipole antenna is proposed with gain enhancement by using the newly emerging substrate-integrated double line (SIDL) technology for potential 5G millimeter-wave (mm-wave) applications. As a three-wire transmission line, the SIDL incorporates two parallel inner strips and one grounded outer conductor. The inner strip pair protrudes and is bent bilaterally to form the dipole’s arms. The outer conductor is stretched out and splits into four strips in a fourfold symmetry along the longitudinal axis to boost the gain. A bilateral slotline technology is used to couple the energy from the feed to the SIDL structure, providing a broadband transition. The shaped SIDL and the transition contribute to the proposed dipole element and then are expanded to a $1\times 2$ array, both of which are designed and fabricated by using the standard printed circuit board (PCB) process. The measurement discloses that the element has an actual −10 dB impedance bandwidth from 33.5 to 47.4 GHz (34.4%@40.4 GHz) with a practical peak gain of 7.00 dBi, which for the array are 32.0–45.1 GHz (34.0%@38.6 GHz) and 8.88 dBi, respectively. Good agreement between the simulated and experimental results demonstrates the feasibility of SIDL’s utilization in designing the printed dipole antenna for high-gain and wideband mm-wave applications.

In this paper, an SICL-based diplexer operated at 7.2 GHz and 10.8 GHz is proposed. It has a simple structure, high isolation, and low insertion loss. And then, a dual-frequency antenna is designed with the proposed diplexer. The elements of SICL-based slot antenna and monopole antenna are used in the design of the antenna. The -10-dB impedance bandwidths are 7.10-7.26 GHz and 9.78-11.48 GHz, and the peak gains corresponding to the center frequency of 7.2 and 10.8 GHz are 5.1 and 6.0 dBi, respectively. The simulated results demonstrate the advantages of SICL technology in the design of low insertion loss and high isolation diplexer.

This study proposes a novel radiating element to enhance the bandwidth of a substrate-integrated waveguide-based resonant slot array antenna. Unlike the conventional scheme, the proposed element has two parallel slots of unequal length. The long slot dominates the radiation, while the short one deals with the matching. An amplitude-tapering power divider was integrated into a 5 × 4 element array to restrain the E-plane sidelobe level (SLL). The measured − 10 -dB bandwidth is 23.14–25.4 GHz (9.42% @24 GHz). The E-plane and H-plane SLLs are − 22.04 and − 30.34 dB, respectively. The cross-polarised levels in the operating band are < − 30 dB and a peak gain of 17.77 dBi was measured at 24.2 GHz. A good agreement is observed between the simulated and measured results and then validates the feasibility of the bandwidth-enhanced slot pair proposed herein.

锂离子电池的荷电状态(SOC)是电池管理系统中的一个重要参数,准确的荷电状态估计对于确保锂离子电池安全可靠的运行十分重要.从估算原理和优缺点等方面出发,综述了国内外各种基于人工神经网络的SOC估算方法的研究进展,并提出了今后的研究展望.

In this communication, a novel transverse slot array with standing-wave excitation using substrate-integrated coaxial line (SICL) technique is proposed. The transverse series slots are arranged with a uniform spacing of one guided wavelength and centered over the inner strip of the SICL. A 5 x 1 element linear subarray is designed with suppressed sidelobe levels (SLLs). A tapering power divider is then adopted to feed eight such subarrays and finally a 5 x 8 2-D array is fabricated and tested for demonstration. A - 10 dB impedance bandwidth (BW) from 33.87 to 35.10 GHz (3.57% at 34.5 GHz) is measured out with a peak broadside gain of 18.82 dBi. The E-plane and H-plane SLLs are -18.4 and -19.2 dB, respectively. Agreement between theory and experiment has been found to be good for both the linear array and the proposed antenna.

This document describes an IoT scenario where ACP and GRASP is suitable to act as a network management channel and a lightweight and extensible network management protocol. Relevent GRASP extention and options are also specified to fulfill the requirements of the scenario.

目前航空工业多采用铝合金部件,由于航空工业的量轻化等需求导致对铝合金件强度保持有较高的要求,因此对结构材料缺陷的检测尤为重要;为此文章设计了一种基于隧道磁电阻(Tunnel magnetoresistance,TMR)传感器的脉冲涡流无损检测系统方案,对铝合金缺陷参数与被测信号波形的关系进行了研究;首先使用有限元仿真软件COMSOL建模并获取仿真实验数据,证明了脉冲涡流无损检测应用于铝合金材料的可行性;其次,应用仿真结果指导探头设计,进而设计出检测系统,采取实物实验结果与仿真建模分析结果进行对比的方法,实验验证了检测系统的准确性、可靠性和在工程应用中的可行性;最后分析和讨论了缺陷宽度和缺陷深度的无损检测结果;为TMR传感器工程应用确立了实验基础。

The growing interest in collision avoidance automotive radar systems in Ka-band necessitates the development of dedicated antenna systems with a 45 degrees inclined linear polarization (LP). In this letter, a 45 degrees inclined LP slot array antenna with the substrate integrated coaxial line (SICL) technique is presented. The proposed antenna is composed of an amplitude-tapering corporate-feed structure and a 5 x 6 inclined-slot array that radiates the 45 degrees linear polarization. In addition, a blind via bridging the inner conductor and the ground of the SICL is adopted beneath each radiating slot for impedance matching. The proposed planar slot array antenna occupies an aperture area of 33.24 mm x 41.13 mm. Measured results indicate that the holistic sidelobe levels in xoz plane and yoz plane are -19.6 and -18.0 dB, and the corresponding cross-polarization levels are -29.5 and -26.8 dB, respectively. A measured peak gain of 17.09 dBi is observed at 34.5 GHz with a -10 dB impedance bandwidth of 910 MHz. The measured results are in good agreement with the theoretical calculations and have demonstrated the validity of the design methodology for the proposed antenna.

In this paper, a quad-band bandpass filter (BPF) with compact size and high skirt selectivity is proposed by using j both stub-loaded resonators (SLRs) and λ/4 resonators. One set of SLRs is utilized not only to generate the lower passbands but also to feed the λ/4 resonators. Three extra transmission zeros (TZs) are created in the stopband by using a zero feed structure. For demonstration, a exemplary filter has been designed and fabricated. Good agreement is observed between the simulated and measured results.

In dense wavelength division multiplexing (DWDM) systems, the dense signals should be broken into two groups with large channel spacing firstly in the demultiplexing process. Therefore, the cost of the whole system can be reduced without upgrading the existing filter. The key device to realize this function of DWDM system is interleaver. In this paper, basing on the analysis of the working principle of micro-ring resonator filters and Mach-Zehnder (M-Z) interferometer, the effects of essential parameter changes on the output waveforms (amplitude and phase property) have been deeply discussed. On the basis of the phase properties of micro-ring resonator filters, we proposed a nested ring resonator (NRR) which has a unique phase characteristic. Through our research, we found that the clever combination of NRR and M-Z interferomert can achieve wideband filtering. In this paper, we proposed a new bandpass filter and an interleaver that consists of MZI side-coupled with a NRR. The output function of the nested ring resonator coupled to M-Z interferometer has been deduced. The output of the NRR coupled to M-Z interferometer is simulated using the output function, The influence of key parameters on the bandwidth, center wavelength, ultra-narrow bandwidth, passband flatness, sidelobe depression and bandwidth ratio of the filter has been analyzed in this paper.

A low profile aperture-coupled patch antenna array with high front-to-back-ratio (FTBR) is designed at Q-band by using substrate integrated coaxial line technique, the intrinsic shielded enclosure of which is capable of constructing an equal-phase and amplitude-tapering feeding network with backlobe suppression. An illustrative example of a 6 × 6 patch antenna array is designed and fabricated with a 2 × 2 prior verification module by using multilayer liquid crystal polymer process. Measured results indicate that the array can achieve a gain of 17.6 dBi at 41.5 GHz and the first sidelobe levels is -24.1 dB in the E-plane and -20.4 dB in the H-plane. The holistic FTBR is better than 27 dB in both planes.

A quad-band microstrip bandpass filter (BPF) based on stub-loaded resonators (SLRs) with improved skirt selectivity is presented. A single metallic via hole in microstrip is utilised to introduce a compact inductive source–load coupling, with which two pairs of SLRs generate eight controllable transmission zeros at each side of all the quadruple passbands. As an example, a quad-band BPF with measured centre frequencies of 1.88, 2.55, 3.55 and 5.15 GHz as well as insertion losses of 1.53, 1.64, 1.79 and 2.55 dB, and respective fractional bandwidths of 4.38, 3.84, 3.44 and 2.9% is designed and fabricated. The measured response shows a good concordance with the simulated one.

In this letter, a novel slot array antenna with a substrate-integrated coaxial line (SICL) technique is proposed. The proposed antenna has radiation slots etched homolaterally along the mean line in the top metallic layer of SICL and achieves a compact transverse dimension. A prototype with 5 × 10 longitudinal slots is designed and fabricated with a multilayer liquid crystal polymer (LCP) process. A maximum gain of 15.0 dBi is measured at 35.25 GHz with sidelobe levels of -28.2 dB (E-plane) and -33.1 dB (H-plane). The close correspondence between experimental results and designed predictions on radiation patterns has validated the proposed excogitation in the end.

This paper focuses on the high frequency current injection method for sensorless control of surface mounted permanent magnet synchronous machines (SPMSM) at low speed. In sensorless control of injection method, a PI close loop is needed to estimate the rotor position. However, constant PI parameters are unable to achieve optimal control effect in both process of dynamic and steady-state. In this paper, fuzzy PI position observer is proposed to realize the real-time parameter adjustment. Simulation and experimental results show that fuzzy PI position observer improves the precision of rotor position estimation and ensures the quickness of the rotor position estimation simultaneously.

In high-frequency (HF) pulsating voltage injection-based sensor-less surface-mounted permanent magnet synchronous motor (SPMSM) control, inverter nonlinearities and motor parameter asymmetries lead to harmonic errors in the estimated position. To eliminate these errors, the second-order generalized integrator (SOGI) is applied. An enhanced position observer with a selective harmonic error eliminator (SHEE) consisting of several SOGIs and an error feed-forward compensator (EFC) are proposed. The harmonic errors in the estimated position are effectively removed. The proposed strategy is verified by experimental results at a 1.5-kW SPMSM sensorless drive.

For the purpose of avoiding the drawbacks of large volume, heavy weight, complex wiring, and low reliability caused by the mechanical position sensors in aeronautic power drives, the self-sensing control of permanent magnet synchronous machines (PMSMs) has been getting increasing attention. High-frequency (HF) pulsating current injection is an efficient method to obtain the rotor position at low speeds. However, in this method, the rotor position is extracted from the command voltage instead of the actual measurement due to the lack of voltage sensors, and the control performance of the HF current is nonideal because of the proportional- integral controller (PI) current regulators. Both these shortcomings give rise to position estimation error. To avoid the aforementioned problems, a novel current regulator consisting of the PI and second-order generalized integrator (SOGI) is presented. The different combinations of the PI and SOGI in the d-q axes current regulators are studied. The system stabilities of the proposed and existing HF pulsating current injection-based selfsensing control strategies are comparatively analyzed considering the current control error and some other aspects. The experimental results demonstrate the feasibility of the proposed strategy by a surface-mounted PMSM vector controlled system.

本文针对视频监控系统实时处理速度瓶颈和视频监控图像失真等问题,提出一种基于FPGA和gamma校正的视频监控系统解决方案,充分利用FPGA并行数据处理的优势,很好地满足了视频监控系统实时性和高清晰度的要求;并采用查找表(LUT)的方法实现快速gamma校正,解决了由显示器亮度非线性输出所导致的视频失真问题.实验结果显示视频监控系统运行稳定,图像清晰度高,且经gamma校正后,暗场灰阶的显示明显改善,细节分明,很好地解决了失真的问题.

This paper proposes a novel method for magnetic polarity detection in pulsating current injection based self-sensing control of surface-mounted permanent-magnet synchronous motors (SPMSM). When a proper high frequency current is superimposed in d-axis, the flux linkage saturates which can lead to the distortion of the resulting voltage. With the Fourier analysis, the 2nd harmonic of the resulting voltage in estimated d-axis includes the magnetic polarity information. A demodulation mechanism is designed to detect the magnetic polarity. This method can achieve fast and accurate initial position estimation and is verified by the simulations and experiments.