• Title/Summary/Keyword: Horn Design

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A Study on the Acoustic Modeling of Horn - Analysis and Design of Acoustic Horn - (Horn의 음향 모델링 연구 - 음향 혼의 해석 및 설계 -)

  • Sa, Jong Sung;Park, Seok-Tae
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.7
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    • pp.537-548
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    • 2014
  • In this paper, horn loudspeaker modeling was suggested, investigated and verified through comparison of test results and simulation ones based on input electrical impedance curves and acoustic sensitivity ones. First, Thiele Small parameters of horn driver were identified by using pseudo loudspeaker model concept and verified in case of both closed and open horndriver. Second, cone-shaped horn models were investigated and compared with input acoustic impedance curves for real horn(cone angle $6.6^{\circ}$) and short horn(cone angle $27.9^{\circ}$). It showed that Leach model for cone horn was well described to test results, which were electrical impedance and acoustic sensitivity, compared to Lemaitre one. To represent horn system model good approximation in wide frequency range, mass correction filter and lowpass filter were adopted and consequently showed good fitted to test results.

Design Method for the Millimeter Wave Corrugated Feed Horn Antenna (mm파 컬러게이트 휘드 혼 안테나의 설계법)

  • Son, Tae-Ho;Park, Young-Tae;Han, Seog-Tae
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.487-491
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    • 2003
  • Design procedure of corrugated horn antenna for mm-wave frequency range is presented, and hybrid condition in horn is calculated. Balanced hybrid mode should be converted in the horn from TE11 mode by the proper corrugation dimensions which size are available to be fabricated under the mm-wave short wavelength condition. In this paper, corrugate profiles which satisfy both hybrid condition and fabrication possibility are obtained.. By cylindrical mode theory, the electromagnetic fields both inside hem and corrugation are delivered. Propagation characteristics in hem is calculated by the mode impedance matching method with boundary conditions, and radiation fields are obtained by the Kirchhoff-Hyugen principle to the hem aperture fields. A mm-wave corrugated horn operates on 85 - 115GHz is designed and fabricated, and results of measurement are also shown.

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Design method and application on the jumper-horn of the 765 kV prefabricated jumper device (765 kV 조립식점퍼장치의 점퍼혼 설계기법 및 적용방안)

  • Cho, S.B.;Kang, Y.W.;Yoon, S.H.
    • Proceedings of the KIEE Conference
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    • 1999.07e
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    • pp.2086-2088
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    • 1999
  • 765kv Transmission lines of the contaminated areas need many insulators due to the contamination. So the length of the arcing hem is very long. Because it is very difficult to install the arcing hem on insulator string sets due to its length, we must install the arcing horn on the jumping devices, and studied about the jumper horn. This paper described the investigation and analysis of the installation status of the arcing horn, and the design of the jumper horn for 765 kV transmission lines.

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Design of Horn Antenna for HAPS(High Altitude Platform Station) in 48/47 GHz Bands

  • Ku, Bon-Jun;Ahn, Do-Seob;Park, Jong-Min
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2001.10a
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    • pp.222-225
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    • 2001
  • This paper describes design and performance test of dual-mode horn antenna for HAPS (High Altitude Platform Station) in 47.2 - 47.5 GHz and 47.9 - 48.2 GHz bands. To obtain the optimal geometry parameters of it. the conical section is represented by a stepped transition composed of a set of cylindrical waveguide sections. For each step. the corresponding generalized scattering matrix is calculated. The elements of the matrices at the open end of the horn, are calculated by the rigorous formulas of the factorization method. To verify the theoretical results, a horn breadboard was manufactured for the medium frequency of 47.7 GHz and its radiation beam patterns were measured. The calculated and theoretical results are in good agreement.

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Modal Analysis of an Ultrasonic Tool Horn for RFID TAG Micro-pattern Forming (RFID TAG 미세패턴 성형을 위한 공구혼 진동해석)

  • Kim, Kang-Eun;Lee, Bong-Gu;Choi, Sung-Ju
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.12
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    • pp.652-658
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    • 2016
  • In this paper, the theoretical research and simulation using the Finite Element Method (FEM) to design and form a micro-pattern for an ultrasonic horn is described. The present method is based on an initial design estimate obtained by FEM analysis. The natural and resonant frequencies required for the ultrasonic tool horn used for forming the fine pattern were predicted by finite element analysis. FEM analysis using ANSYS S/W was used to predict the resonant frequency for the optimum technical design of the ultrasonic horn vibration mode shape. When electrical power is supplied to the ultrasonic transducer, it is converted into mechanical movement energy, leading to vibration. The RFID TAG becomes the pattern formed on the insulating sheet by using the longitudinal vibration energy of the ultrasonic tool horn. The FEM analysis result is then incorporated into the optimal design and manufacturing of the ultrasonic tool horn.

Ka-band Microstrip Antenna Fed Circular Polarized Horn Array Antenna Design (평판형 안테나 급전구조를 이용한 원형편파용 도파관 배열안테나 설계)

  • Jung, Young-Bae
    • Journal of IKEEE
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    • v.17 no.2
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    • pp.140-144
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    • 2013
  • This paper presents the novel design of circular polarized Ka-band horn array antenna. The element antenna of the arrya is composed of two parts, microstrip patch and square horn, and the microstrip patch is fed by corner truncated microstrip patch for circular polarization. The patch antenna has the role of a feeder and polarizer of the horn, thus the whole size of the horn antennae can be considerably reduced. The $1{\times}8$ horn array was designed and fabricated by the spacing of $0.9{\lambda}_0$ among the element horn. The element horn has typical gain of 8dBi and axial-ratio bandwidth of 4.9% at 3dB, and the minimum gain and axial-ratio bandwithd of the array is 14dBi and 8.2%.

Design of a TEM Horn Antenna for Impulse Response Measurement System (임펄스 응답 측정 시스템용 TEM 혼 안테나의 설계)

  • 정경호;편성호;정삼영;최재훈
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.7
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    • pp.669-676
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    • 2003
  • In this paper, a novel design method for an ultra-wide band TEM horn antenna is proposed on the basis of parallel plate waveguide theory. A principle of TEM modes generation is analyzed and the characteristics of this antenna are experimentally investigated. The proposed TEM horn antenna has an exponentially tapered structure to increase matching bandwidth. Also, the designed TEM horn has shortened length but increased aperture so that the bandwidth for cutoff frequency is increased. The measured result show that the proposed TEM hem antenna has the frequency band of 75 MHz to 1200 MHz for VSWR less than 2.0 and the bandwidth of the TEM horn becomes more than twice comparing to that of a linearly tapered TEM hem. It is anticipated that the manufactured antenna is applicable to UWB systems for impulse response measurement.

A Study on the Aluminum Wire Bondingby Using Ultrasonic Vibrator (초음파 진동자를 이용한 알루미늄 와이어 용접에 관한 연구)

  • 김희수;이건복
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1994.10a
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    • pp.571-576
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    • 1994
  • In recent years, ultrasonic has been widely applied in measurement and industrial fields and its application range has been expanded as a result of continuous research and development. Wire Bonding Machine, an instrument fabricating semi-conductor, makes use of ultrasonic bonding method. In order to improve the currently used wire bonding machine using ultrasonic energy, technical accumulation is needed steadily through development of exciting device of ultrasonic composed of piezoelectic vibrator and horn. This study investigates the design conditions affecting the dynamic characteristics through the theoretical and experimental analysis of piezoelectric vibrator and horn, The study conducts separately the system identification of piezoelectric vibrator in time domain and the modal analysis of horn in frequency domain. In theoretical model, the integrated modeling is conducted via a combination of dynamic identification of piezoelectric vibrator and theoretical analysis of horn. Hence comparison is made for theoretical and experimental results of the dynamic characteristics of the ultrasonic transducer composed of piezoelectric vibrator and horn. Form the results of this study we develop the design technique of ultrasonic transducer using dynamic characteristic analysis and propose the possibility of ultrasonic welding considering the optimal condition of the natural frequency and vibration mode of horn.

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A Study on the Relation Between Arc Characteristics and Insulator Protection of the Arcing Horn (Arcing Horn의 아크섬락특성과 애자보호와의 관계 연구)

  • Cho, S.B.
    • Proceedings of the KIEE Conference
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    • 1997.07e
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    • pp.1734-1736
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    • 1997
  • Insulator strings can be frequently damaged by fault currents occured by lightning strokes, overvoltages and contamination of the insulators. So the Insulator damages may lead to extensive damages to transmission lines as well as power outages that have caused dangerous situations to occur. This paper suggests the characteristics of arcing horn in relation to the protection of insulators and basic design concepts of the arcing horn for transmission lines.

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