排序方式: 共有16条查询结果,搜索用时 31 毫秒
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Compact WLAN disc antennas 总被引:1,自引:0,他引:1
McEwan N.J. Abd-Alhameed R.A. Ibrahim E.M. Excell P.S. Ali N.T. 《Antennas and Propagation, IEEE Transactions on》2002,50(12):1862-1864
A novel conical beam patch antenna design, suitable for local area network applications, uses a central cylindrical connection from the disc to ground to achieve a large reduction in resonant size. Results on efficiency, bandwidth, and pattern are reported for several prototypes. 相似文献
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See C.H. Abd-Alhameed R.A. Excell P.S. McEwan N.J. Gardiner J.G. 《Microwaves, Antennas & Propagation, IET》2008,2(7):718-724
A novel internal triple-band folded planar antenna for mobile handsets is introduced, formed by modifying the geometry of a rectangular patch antenna to include a shorting pin, folded sides, a shorted microstrip stub and a notch. The size of the antenna is successfully reduced to a volume of 34 times 34 times 7 times mm3. The antenna is mounted on a finite ground plane of 50times100 times mm2. The impedance bandwidth achieved was 29.7% (equivalent to return loss%%10%dB); this covers the DCS1800, PCS1900 and UMTS 2000 bands. The characteristics of the proposed antenna, including impedance bandwidth and far field radiation patterns are discussed theoretically and experimentally; the simulated and measured results show good agreement. The tuning effects of the geometry parameters on impedance matching of the proposed antenna are also investigated. 相似文献
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Mangoud M.A. Abd-Alhameed R.A. McEwan N.J. Excell P.S. Abdulmula E.A. 《Electronics letters》1999,35(20):1693-1694
An investigation into a two-element phased antenna array mobile handset using the MoM/FDTD hybrid method is presented. The array is designed to provide a spatial null in the near field zone in the direction of the human head. Compared with an omnidirectional antenna, the overall efficiency and azimuth coverage are improved and the peak specific absorption rate in the head can be reduced by at least 10 dB 相似文献
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Hameed Khalid W. Eya Nnabuike Noras James M. Abd-Alhameed Raed A. 《Telecommunication Systems》2020,73(1):105-112
Telecommunication Systems - Multi-user transmission, whereby users share time and frequency resources has been an active research area in the past decade in which the uniform linear array (ULA) was... 相似文献
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The numerical solution of complex electromagnetic problems via heterogeneous solution methods is proposed. This hybrid method is capable of analysing a system of multiple physically-unconnected regions by employing the principle of equivalent sources. The case of multiple sources in the presence of scattering objects is discussed and the results are compared with other available data 相似文献
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Zhou D. Abd-Alhameed R.A. See C.H. Excell P.S. 《Microwaves, Antennas & Propagation, IET》2010,4(2):240-246
In this study, a balanced antenna for mobile handset applications with enhanced bandwidth performance, covering the bands from 1.8 to 2.45 GHz, is investigated. The antenna is a slot planar dipole with folded structure and a dual-arm on each half. The antenna impedance was investigated using a two-port S-parameter method. For the purpose of antenna power gain measurement, a wide bandwidth planar balun was employed to support a balanced feed from an unbalanced source. For validation, a prototype of the proposed antenna was fabricated and tested. The performance of the antenna was then verified in terms of return loss, radiation patterns and power gain. The calculated and measured results show good agreement and the results also confirm good wideband characteristics with low induced current in the ground plane, thus minimising performance variations and SAR. 相似文献
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A dual-polarised conical-beam microstrip antenna, with a strictly uniplanar conductor pattern, is realised as an array of three square patches whose corners meet a central feed point. For the second polarisation the antenna functions as a series fed array 相似文献
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Obeidat Huthaifa Shuaieb Wafa Obeidat Omar Abd-Alhameed Raed 《Wireless Personal Communications》2021,119(1):289-327
Wireless Personal Communications - This paper introduces a review article on indoor localization techniques and technologies. The paper starts with current localization systems and... 相似文献
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A heterogeneous hybrid computational electromagnetics method is presented, which enables different parts of an antenna simulation problem to be treated by different methods, thus enabling the most appropriate method to be used for each part. The method uses a standard frequency-domain moment-method program and a finite-difference time-domain program to compute the fields in two regions. The two regions are interfaced by surfaces on which effective sources are defined by application of the Equivalence Principle. An extension to this permits conduction currents to cross the boundary between the different computational domains. Several validation cases are examined and the results compared with available data. The method is particularly suitable for simulation of the behavior of an antenna that is partially buried, or closely coupled with lossy dielectric volumes such as soil, building structures or the human body. 相似文献