基于HFSS的圆极化微带天线的设计和仿真

设计了一种圆极化微带天线,采用表面开槽的方法来减小天线的尺寸和提高天线的整体性能,介质基板采用高介电常数的材料,通过选择适当的馈电位置和切角实现圆极化工作方式,利用HFSS软件对天线进行了电磁仿真和物理建模,优化了天线的各项参数,得出了驻波比、增益、轴比等仿真曲线。仿真结果表明,天线的增益和方向图特性良好,天线的尺寸明显减小,满足工程需要。     

多用途超宽带印刷单极子天线

提出了一种共面波导馈电的印刷单极子超宽带(UWB)天线.该天线通过在印刷三角形单极子天线上加载圆形结构,同时采用圆弧形渐变结构地板来获得天线的宽频带特性.实验结果表明:该天线在1.7-13 GHz的范围内其VSWR<2;工作频率范围内具有良好的全向辐射特性;传输函数幅度平坦、相位近似呈线性关系、传输时延较为平坦,有利于UWB信号的传输.这种天线可用于UWB、无线局域网、1800GSM和IMT2000等多种无线通信系统中.     

EAST装置离子回旋加热天线电流带热结构分析

介绍了EAST装置新型离子回旋加热(ICRH)天线电流带的设计结构。通过对电流带实际工况的计算得出电流带的工作温度分布,以此来模拟实际工作条件下电流带的热载荷承受能力以及对电流带结构的影响。论证了在实际工况热载荷条件(0.2MW)下,电流带辐射面温度及电流带整体结构强度满足设计要求。     

卟啉超分子化合物在分子器件中的应用

分子电子器件已成为近年来的一个研究热点，卟啉类化合物因为光敏性好、性能稳定、易于修饰等优点成为分子器件研究的理想模型化合物。本文着重介绍了它在分子器件中的最新应用进展。     

Flexible antenna design on PDMS substrate for implantable bioelectronics applications

In the current field of biomedical engineering, the research on implanted antennas has attracted more and more attention. This paper presents a flexible terrestrial radiating antenna with circular polarization characteristics that satisfy various requirements for biomedical implantable antennas. The new type of flexible material is adopted and a novel model is proposed. The square ground with small gap is implemented in the proposed antenna. The passive components can match the impedance and meet the requirements of the circular polarization wave. Simulation is carried out in a single layer tissue model to estimate the performance of the antenna and compared with multilayer tissue model. In addition, the flexible circularly polarized antenna has low profile characteristics and a wide axial ratio bandwidth of 250 MHz, ranging from 2.28 to 2.53 GHz. This paper uses pork to simulate single‐layer and multi‐layer tissue model. The flexible circular polarized antenna prototype is placed in the organization model for performance simulation test, and the measurement impedance bandwidth of 500 MHz is realized in the industrial scientific medical frequency band of 2.4–2.48 GHz.     

Artificial,molecular-based light-harvesting antenna systems made of metal dendrimers and multibodipy species

Artificial photosynthesis is expected to include the development of light-harvesting antenna systems, similarly to what Natural Photosynthesis does. Here some basic requirements for designing synthetic light-harvesting antennae are presented, together with the results obtained by our team in the last few decades on light-harvesting antennae based on metal dendrimers or made of multibodipy species.     

DESIGN AND PHOTOFUNCTIONS OF DENDRIMER-ENCAPSULATED POLY(PHENYLENEETHYNYLENE)S

A series of dendrimer-encapsulated poly(phenyleneethynylene)s 4～6 were Synthesize d. The light-harvesting antenna functions of dendrimer frameworks together with the blue-light emitting activities of 4～6 were highlighted.     

化学计量及其进展

扼要介绍了化学计量主要研究内容和量传方法。并从化学计量技术机构,基准、标准装置,标准物质,检定规程和化学计量学等方面,叙述了化学计量的进展概况。     

Design of Microstrip Antennas with Composite Laminates Considering Their Structural Rigidity

Two types of conformal load-bearing antenna structures (CLAS) were designed with microwave composite laminates and Nomex honeycomb cores to secure both the structural rigidity and a good electrical performance. One was a 4 × 8 array for the synthetic-aperture radar (SAR) system and the other was a 5 × 2 array for the wireless local-area network (LAN) system. The design was based on a wide bandwidth, high polarization purity, low losses, and high structural rigidity. The design, fabrication, and structural/electrical performances of the antenna structures were studied. Their flexural behavior was examined by three-point bending, impact, and buckling tests. The electrical measurements were in a good agreement with simulation results. The complex antenna structures obtained have good flexural characteristics. The design of this antenna structure is extended to give a useful guide for sandwich panel manufacturers as well as antenna designers.     

强爆炸冲击波作用下天线结构的离散变量优化设计

首先建立了强爆炸冲击波作用下天线结构受精度和应力约束的连续变量优化设计数学模型 ;其次 ,根据材料特点 ,将设计变量取为离散变量 ,提出了天线结构在强爆炸冲击波作用下受精度和应力约束的离散变量优化设计数学模型。采用离散变量优化算法离散复合形法 ,对强爆炸冲击波作用下的 8m天线进行了优化计算。结果表明 ,经优化设计后 ,天线重量仅为初始重量的 4 0 %。