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2007 IEEE Antennas and Propagation Society International Symposium最新文献

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Exact expressions of the orbit-curvature and curvature-radius of the Toroidal/Helical orbits. 环/螺旋轨道的轨道曲率和曲率半径的精确表达式。
Pub Date : 2007-06-09 DOI: 10.1109/APS.2007.4396173
R. Speciale
Quite recently, a number of multi-beam klystrons (MBK) have been developed experimentally, and at least three different MBK models are already commercially available. Multi-beam klystrons operate at reduced electron-gun voltage, and higher total beam-current than the single-beam designs, thus preventing occasional destructive gun- diode discharges, and increasing the power-efficiency up to ~ 75%. The power-efficiency (measured as the ratio of output microwave power to input DC power) is however still limited, even in MBK, as it is obviously impossible to extract all the microwave energy from a sharply-bunched electron-beam, without having the high space-charge-density of the slowing beam force it into uncontrollable defocusing.
最近,许多多波束速调管(MBK)已经在实验中开发出来,至少有三种不同的MBK型号已经商业化。与单束速调管相比,多束速调管在更低的电子枪电压和更高的总电子枪电流下工作,从而防止了偶发的破坏性电子枪二极管放电,并将功率效率提高了75%。然而,即使在MBK中,功率效率(以输出微波功率与输入直流功率的比率来衡量)仍然是有限的,因为显然不可能从一个急剧聚集的电子束中提取所有的微波能量,而没有高空间电荷密度的减速束迫使它进入不可控的散焦。
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引用次数: 0
High performance normal mode helical antennas for RFID tags 用于RFID标签的高性能正常模式螺旋天线
Pub Date : 2007-06-09 DOI: 10.1109/APS.2007.4396926
W. Hong, W. H. Jung, Y. Yamada, N. Michishita
A 0.035 wavelength very small normal mode helical antenna is designed to achieve high antenna efficiency. Antenna gain of -3.72dBd is achieved. When this antenna is attached on a metal plate, antenna gain is increased to -0.4dBd. Communication distances of current RFID tags and NMHA tags are measured. In the case of NMHA tags, communication distances comparable to current RFID tags are ensured.
为提高天线效率,设计了一种波长为0.035的极小正模螺旋天线。天线增益达到-3.72dBd。当此天线连接在金属板上时,天线增益增加到-0.4dBd。测量了当前RFID标签和NMHA标签的通信距离。在NMHA标签的情况下,可以确保与当前RFID标签相当的通信距离。
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引用次数: 18
Reflector antenna diagnosis using nearfield data 利用近场数据进行反射天线诊断
Pub Date : 2007-06-09 DOI: 10.1109/APS.2007.4395521
J. Martinez-Lorenzo, C. Rappaport, A. Pino
A new diagnosis method for reflector antennas using nearfield data have been presented. The application of the method for the surface profile reconstruction of a reflector antenna distorted by discrete bumps has been applied successfully.
提出了一种利用近场数据诊断反射面天线的新方法。该方法已成功地应用于被离散碰撞变形的反射面天线的表面轮廓重建。
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引用次数: 1
Substrate integrated waveguide radial power divider for Ka-band satellite applications 用于ka波段卫星的基板集成波导径向功率分配器
Pub Date : 2007-06-09 DOI: 10.1109/APS.2007.4396478
D. Busuioc, G. Shaker, M. Shahabadi, S. Safavi-Naeini
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引用次数: 1
Wideband antenna using non-foster loading elements 采用非培养加载元件的宽带天线
Pub Date : 2007-06-09 DOI: 10.1109/APS.2007.4396543
C. Di Nallo, G. Bit‐Babik, A. Faraone
This paper proposes a different approach to non-Foster or active matching. An antenna structure with two ports is considered. One port is used to couple the signal, while the other one is connected to a non-Foster network. The advantage of this configuration is that the antenna can be designed to have real input impedance, as seen from the feeding port, fairly constant across a very broad band when the active load is applied. The input reactance compensation is essentially performed by the non-Foster network, typically behaving as a negative inductor.
本文提出了一种不同的非福斯特匹配或主动匹配方法。考虑了一种双端口的天线结构。一个端口用于耦合信号,而另一个端口连接到非福斯特网络。这种配置的优点是,天线可以设计成具有真实的输入阻抗,从馈电端口可以看出,当施加主动负载时,在非常宽的频带内相当恒定。输入电抗补偿基本上由非福斯特网络执行,通常表现为负电感。
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引用次数: 15
A mode-based supergain approach with closely coupled monopole pair 一种基于模式的紧密耦合单极子对超增益方法
Pub Date : 2007-06-09 DOI: 10.1109/APS.2007.4396895
Tzung-I Lee, Y.E. Wang
This paper focuses on a mode-based approach that can obtain the maximum gain from closely coupled antennas. Because of the small separation between the coupled dipole antennas, the antenna gain can potentially surpass the physical aperture limit and thus be called supergain. Traditional supergain antennas are actually superdirective only as the directivity can not be translated into real antenna gain because of severe impedance mismatching in those systems.
本文研究了一种基于模式的方法,可以从紧密耦合的天线中获得最大增益。由于偶极子天线之间的距离很小,因此天线增益有可能超过物理孔径限制,因此称为超增益。传统的超增益天线实际上只是超指向性,因为在这些系统中存在严重的阻抗失匹配,指向性不能转化为实际的天线增益。
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引用次数: 7
mm-wave phased arrays in silicon with integrated antennas 带有集成天线的硅毫米波相控阵
Pub Date : 2007-06-09 DOI: 10.1109/APS.2007.4396510
A. Babakhani, D. Rutledge, A. Hajimiri
This work demonstrates W-band integrated dipole antennas and a four channel phased transceiver implemented in IBM 130 nm silicon germanium BiCMOS process. The chip includes the complete receiver, transmitter, signal generation blocks, phase shifters, and on-chip dipole antennas. A hemispherical silicon lens with diameter of about one inch is also used to remove the substrate modes. Measurement results show a maximum antenna gain of about +8 dB.
本研究展示了w波段集成偶极子天线和采用IBM 130纳米硅锗BiCMOS工艺实现的四通道相控收发器。该芯片包括完整的接收器、发射器、信号产生模块、移相器和片上偶极天线。直径约为1英寸的半球形硅透镜也用于去除基板模式。测量结果表明,最大天线增益约为+8 dB。
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引用次数: 23
A sensitivity study of ray-tracing based wireless channel simulators using field measurements 射线追踪无线信道模拟器的灵敏度研究
Pub Date : 2007-06-09 DOI: 10.1109/APS.2007.4395919
F. Aryanfar, F.B. Turney, L. Malek, N. Buris
Toward the goal of achieving robust ray tracing based channel models this paper compares simulation results using a 3D ray-tracing tool [F. Aryanfar and S. Safavi-Naeini, 1998] vs. field measurements in different environments. The tool has been validated for many outdoor and indoor scenes at different frequency bands and is capable of accurate prediction of wireless channel parameters. To test model robustness, we also examine the sensitivity of the predicted results on inputs such as angular resolution, material properties and detail of geometry.
为了实现基于光线追踪的鲁棒通道模型,本文比较了使用3D光线追踪工具的仿真结果[F]。Aryanfar和S. Safavi-Naeini, 1998]对比不同环境下的野外测量。该工具已在不同频段的许多室外和室内场景中进行了验证,能够准确预测无线信道参数。为了测试模型的鲁棒性,我们还检查了预测结果对输入(如角分辨率,材料特性和几何细节)的敏感性。
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引用次数: 0
Novel non planar ultra wide band quasi self-complementary antenna 一种新型非平面超宽带准自互补天线
Pub Date : 2007-06-09 DOI: 10.1109/APS.2007.4396853
Germán Cortés
In this paper we are presenting a novel compact, low profile, non-planar ultra wide band feed that has an input matching better than -11 dB over a decade of frequency bandwidth. In addition, the phase center location of this feed is also invariant over the frequency band.
在本文中,我们提出了一种新颖的紧凑,低轮廓,非平面超宽带馈电,其输入匹配优于-11 dB,超过十年的频率带宽。此外,该馈电的相位中心位置在整个频带内也是不变的。
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引用次数: 31
A dielectric-loaded broadband antenna with frequency-insensitive E-plane radiation pattern 具有频率不敏感e平面辐射方向图的介质负载宽带天线
Pub Date : 2007-06-09 DOI: 10.1109/APS.2007.4395670
F. Hoshi, S. Sugawara, T. Minewaki
In this paper, a dielectric-loaded broadband antenna with frequency-insensitive E-plane radiation pattern has been designed. The optimized antenna with a dielectric has more constant and higher gain than the antenna without a dielectric and also has low return loss over wideband. Consequently, it is found that loading a dielectric and designing antenna shape is effective to improve E-plane radiation pattern and return loss simultaneously.
本文设计了一种具有频率不敏感e平面辐射方向图的介质负载宽带天线。优化后的带介质天线比无介质天线具有更高的恒定增益和更低的宽带回波损耗。结果表明,加载介质和设计天线形状可以有效地同时改善e面辐射方向图和回波损耗。
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引用次数: 1
期刊
2007 IEEE Antennas and Propagation Society International Symposium
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