1. ????: distance from the inne
作者: 炸壞 時(shí)間: 2025-3-27 12:35
作者: eucalyptus 時(shí)間: 2025-3-27 16:41
Ismail Jounyre valuable tools in nuclear medicinal diagnosis (for an overview see [.]). The development of the adequate selective tracers, which will allow deeper insight to tumor biochemistry from outside the human body using PET, is one of the most active areas in current radiopharmaceutical research.
作者: 難理解 時(shí)間: 2025-3-27 19:57
作者: 駕駛 時(shí)間: 2025-3-27 23:14
Broadband Tuning Limits on UWB Antennas Based on Fano’s Formulationnd matching of arbitrary impedances does provide a rigorous solution, and has been previously applied to the lowest-order (TM. or TE.) mode. In this paper we apply Fano’s theory to higher-order spherical modes. Graphs of numerical limits on high-pass and band-pass tuning versus size are presented.
作者: 排他 時(shí)間: 2025-3-28 03:25
Producing Large Transient Electromagnetic Fields in a Small Region: An Electromagnetic Implosiononic beam steering is not required. Basic physical considerations are discussed in [2].What if, instead, one has a target which is relatively close to the antenna so that focusing at infinity may not be appropriate. Focusing at the target can then be used to increase the field strengths there [3, 4]. Such is the subject of the present paper.
作者: 沒(méi)有貧窮 時(shí)間: 2025-3-28 07:45
n supporting mathematical and numerical methods and describeThe eighth conference on Ultra-Wideband, Short-Pulse Electromagnetics (UWBSP8) was held at the Convention Center of Albuquerque, New Mexico, USA, on 9-14 July 2006. This was part of AMEREM 2006. This in turn was part of a Joint Symposium in
作者: 大方一點(diǎn) 時(shí)間: 2025-3-28 11:18
作者: Enthralling 時(shí)間: 2025-3-28 16:23
作者: legislate 時(shí)間: 2025-3-28 20:20
Broadband Self-Complementary Antenna Arraysround plane and hence be used to design broadband antenna arrays. The dielectric slabs act as filters and transform the impedance of the antenna elements. The slabs are chosen to be of equal optical thickness, and, hence, resembling the use of quarter-wavelength transformers in broadband matching re
作者: Hiatal-Hernia 時(shí)間: 2025-3-28 23:43
A Quasi-Planar Wide Band Conical Antennacial property makes it irreplaceable in some modern applications, for instance, in portable or mobile communications requiring very wide-bandwidth channels or where continuous frequency coverage is needed. The prototype of the conical antenna has a threedimensional structure. It is mechanically diff
作者: embolus 時(shí)間: 2025-3-29 04:06
作者: antipsychotic 時(shí)間: 2025-3-29 07:25
An Omnidirectional and Low-VSWR Ultra Wideband Antenna for a Frequency Band of 6 to 40 GHz Omnidirectional and low-VSWR requirements are essential for applications such as UWB channel sounding. The proposed antenna consists of a circular ground plane and a teardrop that is defined as a combination of a finite cone and a sphere inscribed inside the cone at the cone’s base. This antenna ca
作者: 階層 時(shí)間: 2025-3-29 13:17
作者: Arbitrary 時(shí)間: 2025-3-29 16:11
作者: Optic-Disk 時(shí)間: 2025-3-29 20:12
作者: 奴才 時(shí)間: 2025-3-30 01:37
An Approach to the Determination of the Phase Center of Vivaldi-Based UWB Antennabout several hundreds of nanoseconds, so even fine phase center drift will influence the phase of far field much and lead to the waveform dispersion in the time domain [2-3].if we recognize the far field which is radiated by the antenna as a sphere, then the phase center of antenna should be the cen
作者: 創(chuàng)新 時(shí)間: 2025-3-30 07:08
Application of UWB Antenna Descriptors to Antenna Performance Assessment defined by Federal Communications Commission (FCC). Several antenna performance descriptors, such as input impedance bandwidth, gain, beamwidth or effective antenna length, can face strong frequency dependence. In this context, the traditional narrowband approach to antenna design is no more approp
作者: GULLY 時(shí)間: 2025-3-30 08:51
作者: CAND 時(shí)間: 2025-3-30 14:38
作者: 無(wú)能的人 時(shí)間: 2025-3-30 20:00
Producing Large Transient Electromagnetic Fields in a Small Region: An Electromagnetic Implosiony. While there are several ways to realize an IRA (reflector, lens, array), the reflector type is very practical, especially for large ones, if electronic beam steering is not required. Basic physical considerations are discussed in [2].What if, instead, one has a target which is relatively close to
作者: 使閉塞 時(shí)間: 2025-3-30 20:49
作者: Fibroid 時(shí)間: 2025-3-31 04:15
Correction of Time-Domain Data in Special Cases Where the Inverse Transfer Functions are Analytic Tiata by the radar antenna(s), the characteristics of the incident pulse, and other electronic equipment (such as directional couplers). One approach to this problem is to construct, transfer functions (frequency domain) corresponding to these various factors. Then by use of numerical Fourier transfor
作者: 收到 時(shí)間: 2025-3-31 06:09
作者: Optic-Disk 時(shí)間: 2025-3-31 09:34
作者: indoctrinate 時(shí)間: 2025-3-31 13:40
Extended Approaches for Integrated M-Sequence Based UWB Sensorspplications. UWB sensors may be used for imaging and localization systems, ground–penetrating radars, non-destructive testing and radio channel investigation (e.g. channel sounding) and many more. This has resulted in a diversity of requirements concerning the measurement system – touching both its
作者: ENDOW 時(shí)間: 2025-3-31 20:15
Book 2007-14 July 2006. This was part of AMEREM 2006. This in turn was part of a Joint Symposium including IEEE Antennas and Propagation Society International Symposium and USNC (US National Committee)/URSI (International Union of Radio Science) National Radio Science Meeting. This continues the tradition ex
作者: cushion 時(shí)間: 2025-3-31 21:43
Planar Tapered Loop Antennas for Ultra-Wideband Radio Systemsring the design of UWB antennas, not only the usual specifications over the entire frequency range, such as input impedance, gain, polarization, and radiation pattern, etc., but also a good time-domain performance, i.e. the impulse response with minimal distortion, are required.
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