Efficient Near-Field Computation for Radiation and Scattering From Conducting Surfaces of Arbitrary Shape

Hussein, Khalid F. A.

doi:10.2528/pier07010302

Cited by 18 publications

(12 citation statements)

References 11 publications

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“…lower than theoretically expected. It is primarily due to the radiation loss that affects the characterizing of the loss factor of the quarterwavelength open stub resonator [12][13][14][15][16][17][18]. As shown in Figure 5, a parallel-plane structure is placed in a 9 m × 6 m × 6 m Semi-Anechoic Chamber for measuring its overall maximum radiation field.…”

Section: Resultsmentioning

confidence: 99%

Measurement of Rf PCB Dielectric Properties and Losses

Chou¹,

Jeng²,

Lee³

et al. 2008

PIER Letters

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Abstract-This paper presents the calculations of transmission line loss factor by extracting from the Q-factor measurement of the quarterwavelength open stub resonators over the designed frequency and other resonant frequencies. A comparison of the loss factor of the design frequency with other resonant frequencies of each of the stub's quarter-wave resonances is provided in this paper. The radiation and discontinuity losses are undesirably included in the unloaded Q-factor measurement and it shows that the unloaded Q-factor is not repeatable at different designed frequency. The implementation of the loss factor measurement by quarter-wavelength open stub resonators is becoming more and more important to be considered with the increase of using the electronic circuits operating at high frequencies. † This author is also with

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Section: Resultsmentioning

confidence: 99%

Measurement of Rf PCB Dielectric Properties and Losses

Chou¹,

Jeng²,

Lee³

et al. 2008

PIER Letters

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“…One can deduce from the figure that the FSS has a stop band centered at 10.95 GHz. It may be worth noting that an alternative method to study the characterristics of such a spatial filter is to evaluate the near field just behind the planar FSS using the method described in [14] instead of using a receiving antenna.…”

Section: Bowtie Antenna As a Receivermentioning

confidence: 99%

Spatial Filters for Linearly Polarized Antennas Using Free Standing Frequency Selective Surface

Farahat¹,

Hussein²,

El-Minyawi³

2008

PIER M

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Abstract-Free standing planar frequency selective surfaces (FSSs) are studied when utilized as spatial filters for linearly polarized antennas. The antenna spatial filter investigated in the present work is constructed up as a finite planar array of conducting strip dipoles. The electric field integral equation (EFIE) technique with the Rao-WiltonGlison (RWG) basis functions are used to get the current distribution on the conducting strips. The current distribution and backscattered electric field due to an incident plane wave are calculated and compared to some published work. The effect of polarization on the scattered field, and the frequency response of the spatial filter are studied. To test the operation of the proposed planar FSS, a bowtie antenna is used with the FSS employed as a spatial filter. The field transmitted by the antenna and passed over a wide frequency band through the FSS is calculated. It is shown that such a free standing planar FSS can operate as a band stop filter for linearly polarized antennas. It is also shown that even when the size of the array is reduced, the FSS maintains its frequency response with a very slight change in the center frequency of the stop band. The effect of element size, spacing between the elements, and interleaving the columns of the FSS on the frequency response of the FSS are studied. The effect of the spatial filter on the antenna input impedance is studied over a wide frequency band. The radiation pattern of the bowtie is calculated in the presence 168 Farahat, Hussein, and El-Minyawi of the spatial filter. It is shown that the existence of the later causes considerable reduction in the radiation pattern within the stop band of the filter.

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“…Considering field components is necessary in precise modeling of any electrical system [18][19][20][21][22]. Albeit, modeling attitudes such as finite element methods compute variations punctually, requiring a lot of input information.…”

Section: A Modified Winding Function Theorymentioning

confidence: 99%

Mixed Eccentricity Fault Diagnosis in Salient-Pole Synchronous Generator Using Modified Winding Function Method

Faiz¹,

Ebrahimi²,

Valavi³

et al. 2009

PIER B

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Abstract-In this paper, winding function method (WFM), applied to a faulted synchronous generator, is modified and is used for online diagnosis of mixed eccentricity fault. For the first time, the static and mixed eccentricities are modeled in synchronous generators. A modified winding function (MWF) method introduced here is more precise compared with previous methods. This MWF enables to compute the air gap magnetic permeance accurately. Here, two or three terms of the infinity permeance series have not been used, but a closed form equation is employed for permeance evaluation. This leads to a very precise computation of the inductances of the faulted machine. Self inductances of the stator and rotor, mutual inductance of two stator phases and the mutual inductance of rotor and stator are obtained. Meanwhile, it is shown that static, dynamic and mixed eccentricities lead to the increase of the amplitude and occurrence of the distortion in the aforementioned inductances. Since calculation of inductances is the most important step for fault diagnosis of the machine, the proposed method improves the on-line diagnosis of the fault. Meanwhile, the spectrum analysis of stator current, obtained from experimental results, is illustrated.

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Efficient Near-Field Computation for Radiation and Scattering From Conducting Surfaces of Arbitrary Shape

Cited by 18 publications

References 11 publications

Measurement of Rf PCB Dielectric Properties and Losses

Measurement of Rf PCB Dielectric Properties and Losses

Spatial Filters for Linearly Polarized Antennas Using Free Standing Frequency Selective Surface

Mixed Eccentricity Fault Diagnosis in Salient-Pole Synchronous Generator Using Modified Winding Function Method

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