نتایج جستجو برای: dipole antenna

تعداد نتایج: 65961  

2014
Alka Yadav Pawan Yadav

A micro strip-fed printed bow-tie antenna is presented inorder to achieve wide bandwidth, high gain, and size reduction. A comparisonbetween the bow-tie and the quasi-Yagi (dipole and director)antennas shows that the bow-tie antenna has a wider bandwidth, highergain, lower front-to-back ratio, lower crosspolarization level, andsmaller size. Two-element arrays are designed and their characterist...

2009
Alberto González Curto Niek van Hulst

We address experimentally the radiation patterns of quantum dots coupled to optical nanoantennas at specific positions. We show that the emission of the coupled system is determined by a variety of resonant and non-resonant antenna modes both in polarization and angular pattern. The first working optical Yagi-Uda antenna is presented and unidirectional emission is demonstrated for a limited spe...

2017
Thunyawat Limpiti Ajalawit Chantaveerod Wijittra Petchakit

This work presents the design of a magneto-electric dipole (MED) antenna for the base station antenna of FM radio broadcasting implementation. The advantages of MED antenna are high gain, stable and symmetrical radiation patterns in both electric and magnetic planes, and low back lobe radiation pattern. The antenna was designed and studied to achieve the optimal dimensions of configuration para...

Journal: :J. Comput. Physics 2010
Shiwei Zhou Wei Li Qing Li

This paper presents a level-set framework for a typical electromagnetic design problem of dipole antenna. In this study, the geometrical configuration of an antenna is represented by the zero-level contour of a higher-dimensional level-set function. The governing equation for the induced current flow on a metal surface is the Electric Field Integral Equation (EFIE), which takes into account the...

2010
D. Yeo X. Yang J. Wu L. W. Hofstetter J. E. Piel E. W. Fiveland K. J. Park T. K. Foo

Introduction: Clinical evidence indicates that adjuvant mild hyperthermia (41°C-43°C for 30-60 mins) of tumors significantly increases the effectiveness of radioor chemo-therapy [1-3]. It is not designed to kill cancer cells directly but instead promotes drug and oxygen (radiosensitizer) diffusion through the dilated tumor vasculature. Deep-region heating can be induced by RF electric fields ge...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2015
Michael S Eggleston Kevin Messer Liming Zhang Eli Yablonovitch Ming C Wu

Atoms and molecules are too small to act as efficient antennas for their own emission wavelengths. By providing an external optical antenna, the balance can be shifted; spontaneous emission could become faster than stimulated emission, which is handicapped by practically achievable pump intensities. In our experiments, InGaAsP nanorods emitting at ∼ 200 THz optical frequency show a spontaneous ...

2010
J. M. Steyn J. W. Odendaal

A double dipole antenna design is proposed for wireless local area network (WLAN) applications. Two parallel dipoles are used to facilitate operation in both the standard WLAN frequency bands (IEEE 802.11b and IEEE 802.11a) simultaneously. The lower band dipole is rhombus shaped and radiates above a planar ground plane, while radiation from the rectangular higher band dipole is directed through...

2016
Md Rokunuzzaman Mohammad Tariqul Islam Wayne S T Rowe Salehin Kibria Mandeep Jit Singh Norbahiah Misran

A semi-circle looped vertically omnidirectional radiation (VOR) patterned tag antenna for UHF (919-923 MHz for Malaysia) frequency is designed to overcome the impedance mismatch issue in this paper. Two impedance matching feeding strips are used in the antenna structure to tune the input impedance of the antenna. Two dipole shaped meandered lines are used to achieve a VOR pattern. The proposed ...

2010
Weihua Zhang Olivier J. F. Martin

In this work, we study how to use a plasmonic dipole antenna as a multifunctional nanodevice for surface-enhanced Raman spectroscopy (SERS), localized surface plasmon resonance (LSPR) –based sensing and optical trapping. An analytical model is implemented to link the local electric field enhancement with the gradient forces, as well as the resonance shift caused by the presence of the analyte w...

2006
Victor Rabinovich Basim Al-Khateeb Barbara Oakley Nikolai Alexandrov

An easily manufactured, reduced size, symmetrical printed meander dipole antenna for remote keyless entry (RKE) automotive applications in the 315 MHz frequency band is proposed. The efficiency and directionality of this symmetrical antenna is estimated and compared with the efficiency and directionality of an asymmetrical antenna. Numerical and experimental results are presented. © 2006 Wiley ...

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