Method for measuring radiated electric field excited by linear array antenna using near field to far field transformation

Higashiyama, Junji; Tarusawa, Yoshiaki

doi:10.1109/emczur.2007.4388284

Cited by 4 publications

(8 citation statements)

References 4 publications

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“…To do this, one employs the space-frequency transform theory known as the plan wave spectrum (PWS) method. As introduced in [25][26][27][28][29][30][31][32], this spacetransform is exactly similar to the fast Fourier transform in two-dimension domain.…”

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confidence: 73%

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Time-domain near-field/near-field transform with PWS operations

Ravelo

Liu

Slama

2011

Eur. Phys. J. Appl. Phys.

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Abstract-This article deals with the development of computation method dedicated to the extraction of the transient EM-near-field at certain distance from the given 2-D data for the baseband application up to GHz. As described in the methodological analysis, it is based on the use of fft combined with the plane wave spectrum (PWS) operation. In order to verify the efficiency of the introduced method, a radiating source formed by the combination of electric dipoles excited by a short duration transient pulse current with a spectrum bandwidth of about 5 GHz is considered. It was shown that compared to the direct calculation, one gets the same behaviors of magnetic near-field components H x , H y and H z with the presented extraction method, in the planes placed at {3 mm, 8 mm, 13 mm} of the initial reference plane. To confirm the relevance of the proposed transform, validation with a standard commercial tool was performed.In future, we envisage to exploit the proposed computation method to predict the transient electromagnetic (EM) field emissions notably in the microwave electronic devices for the EMC applications.

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confidence: 73%

“…The introduced technique of the EM near field field extraction which enables to predict the value of the field surrounding the electronic emitting source was already introduced in [29][30][31] especially in frequency domain. As depicted in Fig.…”

Section: Description Of the Proposed Technique For The Em Near-field mentioning

confidence: 99%

Time-domain near-field/near-field transform with PWS operations

Ravelo

Liu

Slama

2011

Eur. Phys. J. Appl. Phys.

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“…can be decomposed as a sum of PWS 2D spectral components, which are respectively given mathematically by the following formulae [71][72][73][74][75][76]:…”

Section: Theoretical Principle Of the Nf/nf Extraction Methods [47]mentioning

confidence: 99%

“…The NF extraction method proposed in this paper is based on the PWS theory [71][72][73][74][75][76] combined with the plane wave propagation properties and FFT. The methodology of the computation method is detailed in this section.…”

Section: Presentation Of the Nf / Nf Transform In Time Domainmentioning

confidence: 99%

“…The considered theory on the transient radiation of dipoles is presented in [49][50][51][52][53][54][55][56][57][58][59][60][61][62]. The principle of this method is mainly based on the plane wave spectrum (PWS) transform associated with the fast Fourier transform as introduced in [63][64][65][66][67][68][69][70][71][72][73][74][75][76][77]. We realize here a space-time computation method enabling to map the EM NF in a plane situated at certain distance of the given 2D NF data in time-domain as proposed in [63][64][65][66][67].…”

Section: Introductionmentioning

confidence: 99%

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Application of Near-Field Emission Processing for Microwave Circuits under Ultra-Short Duration Perturbations

Liu

Ravelo

2012

AEM

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This paper deals with the processing method of electromagnetic (EM) near-field (NF) radiated by microwave circuits with transient pulse signals. Two different NF processing methods are proposed by applying the time-frequency approach. First, a computation method of NF/NF transform is presented. This enables to calculate the EM NF maps at different distances from the radiating circuit. The feasibility of NF/NF in both frequency-and time-domain is verified with experimental results. Then, NF processing based on NF emission model implemented in UWB frequency band is also examined in the second part of the paper. For that, the number of EM NF maps representing the large band model is reduced in order to simplify the model based on a set of dipole-array. The timedomain model is implemented by considering the convolution of the transient excitation signals and the UWB dipole-array model. This time-frequency model was validated with a planar microstrip device excited by microwave signal modulating 1.25-GHz-carrier and 0.5-GHz-bandwidth. The methods explored in this paper are particularly useful for the investigation of time-domain emissions for EMC applications by considering transient EM interferences (EMIs).

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The generation of simple compliance boundaries for mobile communication base station antennas using formulae for SAR estimation

Thors¹,

Hansson²,

Törnevik³

2009

Phys. Med. Biol.

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In this paper, a procedure is proposed for generating simple and practical compliance boundaries for mobile communication base station antennas. The procedure is based on a set of formulae for estimating the specific absorption rate (SAR) in certain directions around a class of common base station antennas. The formulae, given for both whole-body and localized SAR, require as input the frequency, the transmitted power and knowledge of antenna-related parameters such as dimensions, directivity and half-power beamwidths. With knowledge of the SAR in three key directions it is demonstrated how simple and practical compliance boundaries can be generated outside of which the exposure levels do not exceed certain limit values. The conservativeness of the proposed procedure is discussed based on results from numerical radio frequency (RF) exposure simulations with human body phantoms from the recently developed Virtual Family.

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Method for measuring radiated electric field excited by linear array antenna using near field to far field transformation

Cited by 4 publications

References 4 publications

Time-domain near-field/near-field transform with PWS operations

Time-domain near-field/near-field transform with PWS operations

Application of Near-Field Emission Processing for Microwave Circuits under Ultra-Short Duration Perturbations

The generation of simple compliance boundaries for mobile communication base station antennas using formulae for SAR estimation

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