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2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)最新文献

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Tunable dual-frequency immittance inverters on dual-composite right/left-handed transmission line 双复合左右传输线上的可调谐双频阻抗逆变器
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369138
D. Kholodnyak, E. Zameshaeva, V. Turgaliev, E. Vorobev
Advanced lumped-element immittance inverters supporting dual-frequency operation and tunability of operational frequencies are the key enablers to design small-size tunable dual-bandpass filters. The paper presents a design concept of tunable dual-frequency immittance inverters based on the dual-composite right/left-handed transmission line (D-CRLH TL) unit cells with variable capacitors. Tunability of such an immittance inverter is limited by a tolerable variation of the inverter parameter which changes when tuning the operational frequencies. At least ±10% tuning of the both operational frequencies is shown feasible theoretically and experimentally.
支持双频工作和工作频率可调性的先进集总元阻抗逆变器是设计小尺寸可调谐双带通滤波器的关键。本文提出了一种基于可变电容双复合左右传输线(D-CRLH - TL)单元电池的可调谐双频阻抗逆变器的设计思想。这种抗阻逆变器的可调性受逆变器参数的可容忍变化的限制,该参数在调谐工作频率时发生变化。在理论上和实验上,两个工作频率至少±10%的调谐是可行的。
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引用次数: 0
Analysis of latency and packet loss in OPS/OBS Metro-access networks using Store-Forward and Deflection-Routing protocols 使用存储转发和偏转路由协议的OPS/OBS城域接入网中的延迟和丢包分析
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369074
I. Bertoldi Martins, F. Rudge Barbosa, Y. Martins, E. Moschim
A new model for wide-metropolitan area optical networks in mesh topology, operating in OPS/OBS modes is analyzed through computer simulation. This model is based on a photonic switching lossless optical node. Basic network parameters such as latency (delay), average number of hops (ANH) and packet loss fraction (PLF) are evaluated with variable link loads to quantify network performance. Store-Forward (SF) and Deflection Routing (DR) transport protocols are compared and demonstrate that inter-node connectivity is more critical than network size (number of nodes) for network throughput and flexibility. This model offers the network planner choice of size (number of nodes), of node connectivity grades, and of routing protocol. This should be helpful for design and planning of cost-effective optical networks.
通过计算机仿真,分析了一种运行在OPS/OBS模式下的网状拓扑的广域光网络新模型。该模型基于光子开关无损光节点。基本的网络参数,如延迟(delay),平均跳数(ANH)和丢包率(PLF)在可变链路负载下进行评估,以量化网络性能。通过对存储转发(SF)和偏移路由(DR)传输协议的比较,我们发现对于网络吞吐量和灵活性而言,节点间的连通性比网络规模(节点数量)更为重要。该模型为网络规划者提供了大小(节点数量)、节点连接等级和路由协议的选择。这将有助于设计和规划高性价比的光网络。
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引用次数: 0
Particle Swarm Optimization for antenna arrays synthesis 天线阵列合成的粒子群优化
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369120
E. Schlosser, S. M. Tolfo, M. Heckler
This paper presents the application of optimization methods to synthesize the radiation pattern of linear antenna arrays. The performance comparison between Particle Swarm Optimization (PSO) and Genetic Algorithm (GA) to obtain different pattern shapes is realized. The techniques are applied for a linear array of isotropic elements, and, subsequently, for a microstrip array.
本文介绍了优化方法在线性天线阵辐射方向图合成中的应用。对粒子群算法(PSO)和遗传算法(GA)在获取不同图案形状时的性能进行了比较。该技术应用于各向同性元件的线性阵列,并随后应用于微带阵列。
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引用次数: 13
S-parameters analysis of waveguide bend with metamaterial 超材料波导弯曲的s参数分析
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369210
D. L. Pinheiro, R. Batalha, Kassiane S. Medeiros, F. Severgnini, Elson J. Silva
Metamaterials are materials built in laboratories that have a negative refractive index. They have been applied in many different areas, such as antennas, super lenses, sensors and cloak of invisibility. In this paper a metamaterial is applied in waveguides, in order to achieve better transmission rates for the electromagnetic waves propagating in those devices. The metamaterial is obtained using split-ring resonators printed on dielectric substrates, and the waveguide's simulation was performed using CST Studio Suite simulator. The effects of those metamaterial structures on the reflection and transmission of the bend waveguide are evaluated by scattering parameters. This article proposes the application of metamaterials in two different scenarios, defined by the position of the metamaterial inside the bend waveguide. Through simulations, the power flow behavior, the loss reduction and increase in the transmission rate inside the waveguide were observed. The insertion of SRR metamaterials allowed the structure to efficiently operate on frequencies above 8 GHz, which is unfeasible for the conventional waveguide.
超材料是指在实验室中制造的具有负折射率的材料。它们已被应用于许多不同的领域,如天线、超级透镜、传感器和隐形斗篷。为了提高电磁波在波导中的传输速率,本文将一种超材料应用于波导中。利用介质基板上印刷的分环谐振器获得了该超材料,并利用CST Studio Suite模拟器对该波导进行了仿真。利用散射参数评价了这些超材料结构对弯曲波导反射和透射的影响。本文提出了超材料在两种不同情况下的应用,由超材料在弯曲波导内的位置来定义。通过仿真,观察了波导内的功率流特性、损耗的降低和传输速率的提高。SRR超材料的插入使得该结构能够有效地工作在8ghz以上的频率上,这对于传统波导来说是不可行的。
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引用次数: 1
Bubbles and clots optical sensor prototype: A system for use in hemodialysis 气泡和凝块光学传感器原型:用于血液透析的系统
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369221
J. Alves, D. Carvalho, S. C. Oliveira, R. Cassia-Moura
Renal failure is a condition characterized by the progressive loss of the renal function of blood clearance. One of the treatment options is by hemodialysis sessions, where a machine performs the kidneys' functions such as filtering and cleaning the blood. In the machine, there are air bubbles ultrasonic sensors, as also as optical sensors for detect blood leakage and presence. Many times the ultrasonic sensor detects false positives causing the procedure to pause. These pauses stops patient's blood circulation and can cause blood coagulation. Moreover, the abrupt restart of the blood external circulation can cause the appearance of air bubbles not detected by the ultrasonic sensor causing air embolism. The use of more efficient sensors might result in decrease of the number of complications during hemodialysis and thus, improve the patients' quality of life. This work presents the development of an optical sensor prototype for air bubbles and additionally for clots detection. The sensor could be applied in the blood circuit of hemodialysis machines.
肾功能衰竭是一种以血液清除功能逐渐丧失为特征的疾病。其中一种治疗方法是血液透析,在透析过程中,机器执行肾脏的功能,如过滤和清洁血液。在机器中,有气泡超声波传感器,也有用于检测血液泄漏和存在的光学传感器。很多时候,超声波传感器检测到误报导致程序暂停。这些停顿会阻止病人的血液循环,导致血液凝固。此外,血液外循环的突然重启会导致超声波传感器检测不到的气泡出现,从而导致空气栓塞。使用更高效的传感器可能会减少血液透析过程中的并发症,从而提高患者的生活质量。这项工作提出了一种用于气泡和血块检测的光学传感器原型的发展。该传感器可应用于血液透析机的血液回路中。
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引用次数: 4
Parameterization strategy for anisotropy reduction in the carpet cloak 减小地毯斗篷各向异性的参数化策略
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369076
Mateus A. F. C. Junqueira, L. Gabrielli, D. Spadoti
In this paper a transformation optical design with anisotropy reduction via parametrization and Least Squares Method is applied to develop a reflectionless quasi-isotropic carpet cloak. We present a coordinate transformation function for the carpet cloak geometry that includes a variable number of degrees of freedom to minimize the anisotropy of the transformed media without interfering with the device boundary conditions. Effects of anisotropy reduction in the coordinate transformation and the effectiveness of our method is verified when different numbers of degrees of freedom for the parameterization function is used. The results appointing that the anisotropy can be very close to zero at cost to use an elevated number of degrees of freedom.
采用参数化和最小二乘法减少各向异性的变换光学设计,研制了一种无反射准各向同性地毯斗篷。我们提出了一个地毯斗篷几何的坐标变换函数,其中包括可变数量的自由度,以最小化转换介质的各向异性,而不干扰器件边界条件。当参数化函数使用不同的自由度数时,验证了各向异性减小对坐标变换的影响和方法的有效性。结果表明,各向异性可以非常接近于零,而代价是使用更高的自由度。
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引用次数: 0
Electrothermal analysis of modified OPGW cables using Multiphysics Model 基于多物理场模型的改型OPGW电缆电热分析
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369208
L. Gonzalez, V. Dmitriev
In this paper we investigate electrical and thermal characteristics of modifications of existing optical ground wire cables - OPGW. The modifications consist of changing geometrical and physical parameters of armor wires. The simulations are carried out by a Multiphysics Model with coupled equations, i.e., the electrical and thermal effects are considered simultaneously in order to increase accuracy of the results. We calculate current density distribution and temperature variation in some points of the cables during short-circuit regime and analyze the influence of the modifications on these characteristics by the software COMSOL.
本文研究了现有光接地电缆OPGW改型的电学和热特性。修改包括改变装甲导线的几何和物理参数。采用耦合方程的多物理场模型进行模拟,即同时考虑电效应和热效应,以提高结果的准确性。利用COMSOL软件计算了短路状态下电缆部分点的电流密度分布和温度变化,并分析了修改对这些特性的影响。
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引用次数: 1
A photonic BPSK modulation with 2.5 GHz RF signal from a microwave optoelectronic oscillator 利用微波光电振荡器的2.5 GHz射频信号进行光子BPSK调制
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369209
J. Panasiewicz, Gefeson Mendes Pacheco
This article presents a photonic circuit that achieves direct carrier BPSK modulation of a RF signal from an opto-electronic oscillator suitable for satellite telemetry and control. The circuit was implemented with two Mach-Zehnder optical modulators. The optical wavelength is 1550 nm. One modulator was used to construct an optoelectronic oscillator to generate a carrier with frequency equal to 2.5 GHz. The second modulator was used to perform the BPSK direct modulation of the carrier signal. A bit rate of 1 Mbps was used and an EVM of 9.6% was obtained. The diagrams of the optoelectronic circuits and the modulation measurements are displayed.
本文提出了一种适用于卫星遥测与控制的光电振荡器的射频信号直接载波BPSK调制的光子电路。该电路由两个马赫-曾德尔光调制器实现。光波长为1550nm。利用一个调制器构造一个光电振荡器,产生频率为2.5 GHz的载流子。第二个调制器用于对载波信号进行BPSK直接调制。采用1 Mbps的比特率,得到9.6%的EVM。给出了光电电路图和调制测量图。
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引用次数: 1
Development of a localized surface plasmon resonance platform for Candida albicans antigen identification 白色念珠菌抗原鉴定的局部表面等离子体共振平台的建立
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369224
W. Neves, R. F. Dutra, R. D. de Araujo, O. Pandoli, T. Del Rosso, Cecilia G. Siqueira, Leonardo M. de Lima, J. Pinheiro
The incidence of hospital infections caused by the fungus Candida albicans has increased substantially in the past decades. Specific tests for the diagnosis of sepsis due to Candida albicans have high cost and require a long time to obtain results. Given this situation and considering the need for constant search for alternatives in the diagnosis of septicemia by Candida albicans, in this work was developed and evaluated a new sensing platform for an optical immunosensor based on localized surface plasmon resonance. The sensing platform corresponds to a glass slide with nanoparticles of silver adhered on its surface and functionalized with monoclonal anti-candida antibodies of the immunoglobulins class. Cysteine molecules were used as ligand in the antibodies functionalization process and glycine as blockers of non-functionalized sites of the platform. On the preparation of the sensing platform, different concentrations of antibodies were explored. In the evaluation of the platform as a Candida albicans antigens sensor, the identification of different antigen concentrations was demonstrated. The results show the system ability to identify Candida albicans antigen concentrations greater than 50ng/mL, indicating the possibility of the use of the platform as immunosensor for Candida.
在过去的几十年里,由真菌白色念珠菌引起的医院感染的发生率大幅增加。诊断白色念珠菌脓毒症的特异性检测费用高,且需要较长时间才能获得结果。鉴于这种情况,并考虑到需要不断寻找替代诊断白色念珠菌败血症的方法,本工作开发并评估了一种基于局部表面等离子体共振的光学免疫传感器的新传感平台。传感平台对应于一个玻璃载玻片,其表面粘附有纳米银,并用免疫球蛋白类单克隆抗念珠菌抗体功能化。在抗体功能化过程中使用半胱氨酸分子作为配体,甘氨酸作为平台非功能化位点的阻滞剂。在传感平台的制备过程中,对不同浓度的抗体进行了探索。在评价该平台作为白色念珠菌抗原传感器时,证明了不同抗原浓度的识别。结果表明,该系统能够识别浓度大于50ng/mL的白色念珠菌抗原,表明该平台可作为念珠菌的免疫传感器。
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引用次数: 0
Dual control of high-frequency chaotic excitations in active ring oscillators based on artificial multiferroics 基于人工多铁性的有源环振高频混沌激励的双重控制
Pub Date : 2015-11-01 DOI: 10.1109/IMOC.2015.7369097
A. Ustinov, A. Kondrashov, B. Kalinikos, A. Nikitin, O. Pakhomov
Properties of the high-frequency spin-electromagnetic wave chaos developed in active ring oscillators have been investigated. A multiferroic structure composed of yttrium iron garnet film and barium strontium titanate (BST) slab served as a nonlinear dispersive medium of the oscillator. Dual control of the fractal dimension of the chaotic signal attractor was realized by variation of the ring gain and dielectric permittivity of the BST slab.
研究了有源环形振荡器中高频自旋电磁波混沌的性质。由钇铁石榴石薄膜和钛酸锶钡(BST)板组成的多铁结构作为振荡器的非线性色散介质。通过改变BST板的环增益和介电常数,实现了混沌信号吸引子分形维数的双重控制。
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引用次数: 0
期刊
2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)
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