Finite-difference time-domain model for the feeding gap of coaxial probe driven antennas

Hyun, Seung-Yeup; Kim, S.-Y.; Kim, Y.-S.

doi:10.1049/iet-map.2008.0082

Cited by 4 publications

(6 citation statements)

References 10 publications

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“…A feeding method of an antenna for the simulation has not been established yet, although several methods have been proposed [28,29,30,31,32]. In this paper, the gap feeding method [33,34] was applied to simulate both the monopole antenna for radiating the EM waves and the UHF sensors for receiving them, due to its simplicity.…”

Section: Simulation Technique Of the Em Wave Propagationmentioning

confidence: 99%

Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers

Umemoto

Tenbohlen

2018

Sensors

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Diagnoses of power transformers by partial discharge (PD) measurement are effective to prevent dielectric failures of the apparatus. Ultra-high frequency (UHF) method has recently received attention due to its various advantages, such as the robustness against external noise and the capability of PD localization. However, electromagnetic (EM) waves radiated from PD tend to suffer attenuation before arriving at UHF sensors, because active part of the transformer disturbs the EM wave propagation. In some cases, that results in poor detection sensitivity. To understand propagation and attenuation characteristics of EM waves and to evaluate the detection sensitivity quantitatively, a computational approach to simulate the EM wave propagation is important. Although many previous researches have dealt with EM wave simulation for transformers, validations of those simulations by comparing with the experimental ones have seldom been reported. In this paper, cumulative energies, signal amplitudes and propagation times of EM waves were measured using a 630 kVA transformer. EM wave propagation was computed using the time-domain finite integration technique and the results were compared with the experimentally obtained ones. These simulation results showed good agreement with the experimental ones. The results can serve as guidelines to improve the efficiency of UHF PD detection and offer the possibility to achieve optimal placement of UHF sensors in power transformers.

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Section: Simulation Technique Of the Em Wave Propagationmentioning

confidence: 99%

Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers

Umemoto

Tenbohlen

2018

Sensors

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“…급전 영역은 안테나 의 관점에서 전원(source)이면서 동시에 전송선의 관점에 서는 부하(load)에 해당한다. 또한, 급전 영역의 전자계는 공간적 변화가 매우 심하므로, 안테나의 해석과 최적 설 계에 있어서 세심한 주의가 필요하다 [2], [3] .…”

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“…그런데, 급전 영역 주변에 서 전자계는 공간적으로 매우 급격한 변화를 겪게 되므 로, 급전 영역은 표준 FDTD의 정확성 조건에 비해서 좀 더 충분히 세밀한 격자(fine-grid)로 모델링해야 한다. 이 로 인하여 많은 계산용량이 필요할 뿐만 아니라, 계산시 간이 오래 걸리는 문제가 생긴다 [2], [3] . 이에 대한 대안으로 FDTD 계산 용량을 대폭 줄이면서도, 충분한 정확성을 유 지할 수 있는 등가 모델링 기법으로 급전점(feeding point) 에서 델타 갭(delta-gap) 또는 자기 프릴(magnetic-frill) 개 념을 FDTD에 도입한 등가 전원 모델이 여러 연구진에 의 해 개발되었다 [2]～ [12] .…”

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“…동축선을 TEM 전송선으로 근사하면, 전송선의 부하에 걸리는 총전압   는 입사전압   와 반 사전압    의 중첩으로 다음과 같이 된다 [2], [3] . [7] .…”

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“…전송선 이론 관점에서 동축 개구면 상의 등가 부하 회로 표준 FDTD에서 전계와 자계가  시간마다 엇갈 려 계산하는 leap-frog 기법을 따르므로, 식 (13)에서 전압 과 전류 간에도  시간차로 계산한다 [2], [3] . 식 ( [13] .…”

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A Comparative Study on Interrelation between FDTD Source Models for Coaxial-Probe Feeding Structures

Hyun¹

2014

The Journal of Korean Institute of Electromagnetic Engineering

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For an efficient finite-difference time-domain(FDTD) analysis of coaxial-probe feeding structures in radio frequency(RF) and microwave bands, an interrelation between equivalent source modeling techniques is investigated. In existing literature, equivalent source models with delta-gap or magnetic-frill concepts have been developed by many researchers. It is well known that FDTD implementation and computational accuracy of these source models are slightly different. In this paper, the interrelation between FDTD equivalent source models for coaxial feeding structures under the quasi-static approximation(QSA) is presented. As a function of FDTD equivalent source models, time-domain and frequency-domain responses of a coaxial-probe fed conical monopole antenna are calculated numerically. And comparison results of computational accuracy and efficiency are provided.

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Validations of simulation of UHF electromagnetic wave propagation in an oil‐filled tank by time‐domain measurements

Umemoto

Tenbohlen

2019

IET Generation, Transmission & Distribution

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Finite-difference time-domain model for the feeding gap of coaxial probe driven antennas

Cited by 4 publications

References 10 publications

Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers

Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers

A Comparative Study on Interrelation between FDTD Source Models for Coaxial-Probe Feeding Structures

Validations of simulation of UHF electromagnetic wave propagation in an oil‐filled tank by time‐domain measurements

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