• Title/Summary/Keyword: Mutual Coupling

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Estimation of the Substrate Size with Minimum Mutual Coupling of a Linear Microstrip Patch Antenna Array Positioned Along the H-Plane

  • Kwak, Eun-Hyuk;Yoon, Young-Min;Kim, Boo-Gyoun
    • Journal of Electrical Engineering and Technology
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    • v.10 no.1
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    • pp.320-324
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    • 2015
  • Mutual coupling between antenna elements of a linear microstrip patch antenna array positioned along the H-plane including the effect of edge reflections is investigated. Simple formulas are presented for the estimation of the grounded dielectric substrate size with minimum mutual coupling. The substrate sizes calculated by these formulas are in good agreement with those obtained by the full-wave simulation and experimental measurement. The substrate size with minimum mutual coupling is a function of the effective dielectric constant for surface waves and the distance between the antenna centers. The substrate size with minimum mutual coupling decreases as the effective dielectric constant for surface waves on a finite grounded dielectric substrate increases.

Effect of a Finite Substrate on the Mutual Coupling of a Pair of Microstrip Patch Antennas along the H-plane (유한한 기판 크기가 H-평면상에 배열된 두 개의 패치안테나간의 상호결합에 미치는 영향)

  • Kim, Gun-Su;Kim, Tae-Young;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.47 no.10
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    • pp.67-73
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    • 2010
  • In this paper, the effect of a finite substrate on the mutual coupling of a pair of microstrip patch antennas along the H -plane is investigated. The mutual coupling of a pair of microstrip patch antennas can be reduced using the interference effect due to the phase difference by a variety of routes of the surface wave. In the case of the substrate with $\varepsilon_r$=10 and thickness of 3.2 mm, the mutual coupling is reduced by 4.85 dB on the substrate size with the strong mutual coupling, while the mutual coupling is reduced by 34.28 dB on the substrate size with the weak mutual coupling when the distance between the antenna centers is varied from 0.5 $\lambda_0$ to 1.0 $\lambda_0$. In the case of optimization substrate size, the decreasing rate of the mutual coupling with the increase of the distance between the antenna centers is very large. Good agreements between the image method and full wave simulation results are obtained.

Mutual Coupling Compensation and Direction Finding for Anti-Jamming 3D GPS Antenna Array (항재밍 3차원 GPS 배열 안테나를 위한 Mutual coupling 보상 및 재밍 방향탐지 알고리즘)

  • Kang, Kyusic;Sin, Cheonsig;Kim, Sunwoo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.42 no.4
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    • pp.723-730
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    • 2017
  • In this paper, we consider an online compensation algorithm considering the mutual coupling and suggest a new GPS antenna array to apply. To evaluate the anti-jamming performance for the proposed antenna array, ULA and URA, we divide direction finding of multiple jamming signals into environments. 1. there is no mutual coupling. 2. there is mutual coupling but no compensation. 3. mutual coupling is compensated. RMSE analysis showed that the online compensation algorithm works and that peak detection is possible for multiple jamming signals.

The Effect of Mutual Coupling between Current and Potential Test Leads on Ground Impedance (전류 및 전위 측정선간 상호유도가 접지임피던스에 미치는 영향)

  • Eom, Ju-Hong;Cho, Sung-Chul;Lee, Tae-Hyung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.7
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    • pp.1223-1228
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    • 2008
  • While a high frequency source is used for measuring the ground impedance, there are several factors having an effect on the measured value. A primary factor of the measurement error is the ac mutual coupling between current and potential test leads. The mutual coupling causes the test current to induce a voltage into the potential test lead that adds to the actual ground potential rise and produces a significant measurement error as the length of the test leads paralleled is prolonged. In order to avoid the mutual coupling, it is recommended that the ground impedance be measured by angled arrangement of test leads. The mutual impedance due to the inductive coupling with an angle of $90^{\circ}$ was calculated at $0^{\circ}$ by Campbell/Foster Method. With an angle of $180^{\circ}$, the mutual impedance was calculated large value enough to introduce a fairly large margin of error, however, the measured value of ground impedance was close to the value at $90^{\circ}$.

Mutual Coupling Capacitance and Cross-talk in TFT-LCD

  • Yun, Young-Jun;Jung, Soon-Shin;Kim, Tae-Hyung;Roh, Won-Yeol;Choi, Jong-Sun
    • 한국정보디스플레이학회:학술대회논문집
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    • 2000.01a
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    • pp.71-72
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    • 2000
  • The design of large area thin film transistor liquid crystal displays (TFT-LCDs) requires consideration of cross-talks between the data lines and pixel electrodes. These limits are imposed by the mutual coupling capacitances present in a pixel. The mutual coupling capacitance causes a pixel voltage error. In this study, semi-empirical model, which is adopted from VLSI interconnection capacitance calculations, is used to calculate mutual coupling capacitances. With calculated mutual coupling capacitances and arbitrary given image pattern, the root mean square (RMS) voltage of pixel is calculated to see vertical cross-talk from the first to the last column. The information obtained this study can be utilized to design the larger area and finer image quality panel.

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MUTUAL COUPLING EFFECTS ON THE PERFORMANCE OF A SPACE-TAPERED RECTANGULAR PHASED ARRAY (공간체감된 구형 위상어레이의 성능에 미치는 상호결합의 영향)

  • Chang Byong-Kun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.9 no.2
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    • pp.415-421
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    • 2005
  • The radiating or receiving characteristics of array elements (i.e., antennas) are changed from those of isolated elements due to mutual coupling effects and the array performance becomes different from those originally designed by assuming isolated elements. The effects of mutual coupling on the performance of a rectangular array with triangular grid geometry of dipoles above a ground plane are discussed with respect to element pattern. The concept of element gain function is used to examine the effects of mutual coupling on the array performance in terms of sidelobe level in the uniformly spaced and space-tapered rectangular arrays with triangular grid geometry of dipoles. It was shown that the sidelobe performance improved in the space-tapered array compared to the uniformly spaced array in the presence of mutual coupling effects. Computer simulation results are presented.

Mutual Coupling Characteristics of a 2-element Array Antenna using Inductor Loaded Patch Antennas (Inductor Loaded 패치안테나를 이용한 2 소자 배열 안테나의 상호결합 특성)

  • Kim, Gun-Su;Kim, Tae-Young;Yoon, Young-Min;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.48 no.4
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    • pp.92-99
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    • 2011
  • Effect of a finite grounded substrate on mutual coupling characteristics of a 2-element array antenna using inductor loaded patch antennas is investigated. The mutual coupling characteristics of a 2-element array antenna using inductor loaded patch antennas positioned along the E-plane are compared with those positioned along the H-plane. The magnitude of mutual coupling is very small and the distance between the center of element and the substrate edge on the E-plane for the minimum mutual coupling is similar regardless of the direction at which antenna elements are positioned in the case of a 2-element array antenna using inductor loaded patch antennas.

Characteristic Evaluation on Semi-Anechoic Chamber with Mutual Impedance Correction (상호결합을 고려한 전파반무함실의 특성평가)

  • 김민석;김동일
    • Journal of the Korean Institute of Navigation
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    • v.20 no.3
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    • pp.97-105
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    • 1996
  • Authors have studied characteristics evalution on semianechoic chamber. And authors also find that in case of low frequencies like from 30MHz to 100MHz there are big differencies between the calculated and the measured site attenuation in semianechoic chamber made with ferrite grid. This is on account of not being considered the mutual coupling effects between two antennas. Accordingly Authors calculated site attenuation due to mutual coupling effects and compared the measured site attenuation with the calculated site attenuation with mutual coupling correction. As a result good agreement between site attenuation, measured or calculated is obtained.

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A study on the Difference Arrow of GDS (Geomagnetic Depth Sounding) Survey using 2-D MT (Magneto-Telluric) Modeling (2차원 MT(Magneto-Telluric)모델링을 이용한 지자기 수직탐사(Geomagnetic Depth Sounding)에서의 차이 지시자의 연구)

  • 양준모;오석훈;이덕기;윤용훈
    • Economic and Environmental Geology
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    • v.35 no.6
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    • pp.567-573
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    • 2002
  • Two-dimensional MT (Magneto-Telluric) modeling is performed to verify the validity of difference arrow for GDS(Geomagnetic Depth Sounding) survey. The electromagnetic mutual coupling between the sea and in-land conductor is used as a criterion that judges the validity of difference arrow. In this study, the mutual coupling between them is examined according to the spatial distance between them and the period of magnetic variations. The difference arrow is valid for conductors located at surface which are far from the sea or when the long period is used, but the mutual coupling is weak for buried conductor in all the periods. However, when a conductor extends vertically down to the deep part, the validity of difference arrow is in doubt, since the strong mutual coupling influences up to the long period. Therefore, to remove the known conductor effect such as sea effect from the observed induction arrow, the mutual coupling between them must be examined and the caution must be exercised in interpreting the resultant difference arrow if mutual coupling between them is strong.

Effects of Ac Mutual Coupling According to Location of Auxiliary Electrodes In Measuring the Ground Impedance of Vertically or Horizontally Buried Ground Electrode (수직 또는 수평으로 매설된 접지전극의 접지임피던스 측정시 보조전극 위치에 따른 전자유도의 영향)

  • Choi, Young-Chul;Choi, Jong-Hyuk;Lee, Bok-Hee;Jeon, Duk-Kyu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.8
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    • pp.86-92
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    • 2009
  • In order to minimize ac mutual coupling, the auxiliary electrode are located at a right angle in measuring ground impedance. In case that the measurement space is limited, the alternative method is employed. At that time, it is necessary to investigate the measurement errors due to ac mutual coupling and earth mutual resistance in measuring the ground impedances. 'This paper presents the measurement accuracy according to the location of the current and potential auxiliary electrodes in measuring ground impedance of vertically or horizontally buried ground electrode. The measurement errors due to ac mutual coupling were evaluated Consequently, the effect of ac mutual coupling on the measurement accuracy for horizontally buried ground electrode is greater than that for vertically buried ground electrode. Measurement errors due to ac mutual coupling is the largest when the current and potential auxiliary electrodes are located in parallel. The 61.8[%] rule is inappropriate in measuring ground measurement. Theoretically, in case that the angle between the current and potential auxiliary electrodes is 90$[^{\circ}]$, there is no ac mutual coupling. If it is not possible to route the current and potential auxiliary electrodes at a right angle with limitation of measurement space, the location of these electrodes with an obtuse angle is preferred to that with an acute angle in reducing the measurement errors due to ac mutual coupling.