IEEE Transactions on Antennas and Propagation

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A vector neural network for emitter identification
IEEE Transactions on Antennas and Propagation - Tập 50 Số 8 - Trang 1120-1127 - 2002
Ching-Sung Shieh, Chin-Teng Lin
This paper proposes a three-layer vector neural network (VNN) with a supervised learning algorithm suitable for signal classification in general, and for emitter identification (EID) in particular. The VNN can accept interval-value input data as well as scalar input data. The input features of the EID problems include the radio frequency, pulse width, and pulse repetition interval of a received em... hiện toàn bộ
#Neural networks #Space vector pulse width modulation #Backpropagation algorithms #Supervised learning #Pattern classification #Radiofrequency identification #Radio frequency #RF signals #Radar #Error correction
Generalized soft-and-hard surface
IEEE Transactions on Antennas and Propagation - Tập 50 Số 7 - Trang 926-929 - 2002
I.V. Lindell
Soft-and-hard surface (SHS) is a mathematical idealization of the tuned corrugated boundary. The boundary conditions are defined by a single real vector parallel to the corrugations. The SHS boundary was recently generalized by replacing the real vector by a complex vector and its conjugate (see Lindell, I.V., Proc. Inst. Elect. Eng. Microw. Antenna Propagat., vol.147, p.495-9, 2000). The SHS boun... hiện toàn bộ
#Corrugated surfaces #Boundary conditions #Conductors #Tellurium #Electromagnetic wave polarization #Magnetic anisotropy #Perpendicular magnetic anisotropy #Surface waves #Electromagnetic reflection
A broadband planar quasi-Yagi antenna
IEEE Transactions on Antennas and Propagation - Tập 50 Số 8 - Trang 1158-1160 - 2002
N. Kaneda, W.R. Deal, Yongxi Qian, R. Waterhouse, T. Itoh
A novel broadband planar antenna based on the classic Yagi-Uda dipole array is presented. This "quasi-Yagi" antenna achieves a measured 48% bandwidth for VSWR <2, better than 12 dB front-to-back ratio, smaller than -15 dB cross polarization, 3-5 dB absolute gain and a nominal efficiency of 93% across the operating bandwidth. Finite-difference time-domain simulation is used for optimization of the ... hiện toàn bộ
#Broadband antennas #Phased arrays #Antenna arrays #Dipole antennas #Bandwidth #Microstrip antenna arrays #Antenna measurements #Microstrip antennas #Planar arrays #Gain measurement
Low-Profile Wideband High-Gain Reconfigurable Antenna With Quad-Polarization Diversity
IEEE Transactions on Antennas and Propagation - Tập 66 Số 7 - Trang 3741-3746 - 2018
Huy Hung Tran, Nghia Nguyen-Trong, Tuan Tu Le, Amin M. Abbosh, Hyun Chang Park
A low-profile, wideband, high-gain reconfigurable antenna, which is capable of switching among four linear polarizations (LPs) at every 45° rotation, namely, 0°, 45°, 90°, and 135° LP, is presented. The proposed structure is based on two half-ellipse-shaped dipoles arranged perpendicularly and is center fed by coaxial cable. The antenna polarization can be switched by selecting the appropriate dip... hiện toàn bộ
#Artificial magnetic conductor (AMC) #dipole #high gain #linear polarization (LP) #low profile #p-i-n diode #polarization reconfigurable #wideband
Analysis of finite-microstrip structures using surface equivalence principle and multiple network theory (SEMN)
IEEE Transactions on Antennas and Propagation - Tập 50 Số 8 - Trang 1128-1137 - 2002
F. Tavakkol-Hamedani, A. Tavakoli, L. Shafai
Two techniques are developed for the analysis of finite microstrip structures. They are based on electric and magnetic field integral equation (EFIE and MFIE) formulations of the surface equivalent principle and multiple network theory (SEMN) method. Using pulse surface basis functions, the surface of each homogeneous dielectric body is modeled by small flat segments of arbitrary geometry and cons... hiện toàn bộ
#Magnetic analysis #Microstrip #Magnetic fields #Integral equations #EMP radiation effects #Dielectrics #Solid modeling #Electromagnetic modeling #Geometry #Electromagnetic fields
Efficiency and gain of slot antennas and arrays on thick dielectric substrates for millimeter-wave applications: a unified approach
IEEE Transactions on Antennas and Propagation - Tập 50 Số 8 - Trang 1088-1098 - 2002
G.V. Eleftheriades, Meide Qiu
A unified approach for representing the surface-wave fields and for computing the corresponding radiation efficiencies from arbitrarily shaped slot-type antennas on thick dielectric substrates at millimeter-wave (mm-wave) frequencies is presented. In this approach, two different representations of the surface-wave fields, i.e., the one based on the idea that the surface-wave power can be associate... hiện toàn bộ
#Slot antennas #Antenna arrays #Dielectric substrates #Surface waves #Surface treatment #Dipole antennas #Coplanar waveguides #Frequency #Linear antenna arrays #Patch antennas
Experimental verification of the effect of aperture shape on prompt IRA response
IEEE Transactions on Antennas and Propagation - Tập 50 Số 7 - Trang 1032-1034 - 2002
J.S. Tyo, C.J. Buchenauer
This article presents experimental measurements verifying the relationship between aperture shape and prompt response in an impulse radiating antenna (IRA). Various aperture configurations were realized by constructing a lens IRA with focusing aperture significantly larger than the transverse electromagnetic (TEM) feed structure and then eliminating portions of the aperture with metal blocks. Virt... hiện toàn bộ
#Feeds #Impedance #Shape measurement #Lenses #Electromagnetic radiation #Ultra wideband antennas #Antenna measurements #Electromagnetic measurements #Aperture antennas #Ultra wideband technology
Invasive Weed Optimization and its Features in Electromagnetics
IEEE Transactions on Antennas and Propagation - Tập 58 Số 4 - Trang 1269-1278 - 2010
Shaya Karimkashi, Ahmed A. Kishk
High-frequency (whispering-gallery mode)-to-beam conversion on a perfectly conducting concave-convex boundary
IEEE Transactions on Antennas and Propagation - Tập 50 Số 8 - Trang 1109-1119 - 2002
K. Goto, T. Ishihara, L.B. Felsen
When a well-confined high-frequency (HF) whispering-gallery (WG) mode launched from the concave side of a concave-convex perfectly conducting boundary propagates toward the convex side, it becomes successively less confined and eventually detaches completely to form a radiated beam field. Detailed characterization of the intricate WG mode-to-beam conversion (here considered for the two-dimensional... hiện toàn bộ
#Optical surface waves #Optical scattering #Hafnium #Physical optics #Surface waves #Algorithm design and analysis #Optical propagation #Structural beams #Hybrid power systems #Ray tracing
A Mixed Rays—Modes Approach to the Propagation in Real Road and Railway Tunnels
IEEE Transactions on Antennas and Propagation - Tập 60 Số 2 - Trang 1095-1105 - 2012
Franco Fuschini, G. Falciasecca
Tổng số: 53   
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