• Title/Summary/Keyword: Wideband transducer design

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Acoustic Characteristics Analysis of the Axi-symmetric Transducer by the combined Finite Element Method and Hybrid Type Infinite Element Method, Part II : Wideband Array Transducer Design and its Acoustic Characteristics (유한요소법과 하이브리드형 무한요소법의 결합에 의한 축대칭 변환기의 음향 특성해석(II) ;광대역 배열 변환기의 설계 및 그 음향특성)

  • Kim, Chun-Duck;Kim, Won-Ho;Kim, Dae-Whan;Yoon, Jong-Rak
    • The Journal of the Acoustical Society of Korea
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    • v.13 no.2
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    • pp.68-75
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    • 1994
  • This is the second of two companion papers wich describes the wideband array transducer design procedure and the designed transducer acoustic characteristics. In addition, the result of the designed transducer acoustic characteristics by the combined Finite Element Method and Hybrid Type Infinite Element Method, is found to better than that by the equivalent circuit model method. Therefore, the technique presented in this paper could be applied in the design and the acoustic characteristics analysis of the wideband array transducer.

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Design of piezoelectric micro-machined ultrasonic transducer for wideband ultasonic radiation in air (공기 중 광대역 초음파 방사용 압전 박막 기반 초소형 초음파 트랜스듀서의 설계)

  • Ahn, Hongmin;Jin, JaeHyeok;Moon, Wonkyu
    • The Journal of the Acoustical Society of Korea
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    • v.39 no.2
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    • pp.87-97
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    • 2020
  • In this paper, the design of piezoelectric Micro-machined Ultrasonic Transducer (pMUT) for wideband ultrasonic radiation in air was investigated. One of the methods to achieve wide frequency bandwidth in single device is modeling the transducer to multi-resonance system. The new pMUT was designed as a multi-resonance system with the addition of a suitable acoustic structure to the front and back of a thin film structure. A new pMUT consisting of thin film parts, radiation parts, and packaging parts is designed with a Lumped Parameter Model (L.P.M). Finally, it was validated as a Finite Element Method (FEM) simulation. The final designed pMUT achieved a frequency band of 102 kHz ~ 132 kHz (-3 dB).

Study on the Wideband Tonpilz Transducer with a Cavity-Type Head Mass (중공형 전면추를 가진 Tonpilz 트랜스듀서 연구)

  • Kim, Hyunki;Lim, Youngsub;Roh, Yongrae
    • The Journal of the Acoustical Society of Korea
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    • v.33 no.2
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    • pp.94-101
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    • 2014
  • In this work, we present an underwater acoustic transducer with a cavity-type head mass to achieve a wide frequency bandwidth. We analyzed the effects of design variables on the transducer characteristics, and optimized the structure of the Tonpilz transducer based on the analysis results. Further, validity of the design was verified by manufacturing a prototype of the transducer and measuring its properties. The designed transducer had a far wider -6 dB fractional bandwidth which is 131 % than that of a single mode transducer, and the measured results were confirmed to be in good agreement with the analysis results.

Design and Fabrication of Multi-mode Wideband Tonpilz Transducers (다중모드 광대역 Tonpilz 트랜스듀서의 설계 및 제작)

  • Kim, Jinwook;Kim, Hoeyong;Roh, Yongrae
    • The Journal of the Acoustical Society of Korea
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    • v.32 no.3
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    • pp.191-198
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    • 2013
  • In this paper, we designed a wideband Tonpilz transducer, and verified the validity of the design through experiments. The wide frequency bandwidth was achieved by coupling the fundamental longitudinal mode of the transducer with a flapping mode of the head mass. Structure of the Tonpilz transducer was optimized by means of the finite element method and genetic algorithm to achieve the widest fractional bandwidth under design constraints. The optimized structure showed a far wider -6 dB fractional bandwidth of transmitting responses than that of single mode transducers. For verification of the design result, we manufactured a transducer prototype of the designed structure and characterized its performance, which showed good agreement with the design results.

The Design and Experiment of Power Factor Improvement Circuit for a Underwater Electro Acoustic Transducer with Low Coupled Dual Resonances (상호 결합이 적은 두 개의 공진점을 갖는 수중용 광대역 전기 음향 변화기를 위한 역률 개선 회로 설계 및 실험)

  • Lim, Jun-Seok;Pyeon, Yong-Guk
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.38B no.12
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    • pp.967-975
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    • 2013
  • In the design of underwater electro acoustic transducer, power factor improvement circuit is more required rather than impedance matching if the driving power amplifier has little inner resistance. Many research results have been focused on the power matching circuit designing for transferring maximum power in the wideband. There are few results in the designing study on the power factor improvement for the wide band underwater electro acoustic transducer. In this paper, we set up a new design method on the power factor improvement for the wide band electro acoustic transducer, and confirm its feasibility by the experiments.

A Systematic Power Factor Improvement Method for an Electro Acoustic Transducer with Low Coupled Dual Resonances (상호 결합이 적은 두 개의 공진점을 갖는 광대역 전기 음향 변화기를 위한 역률 개선 회로 설계 방법 연구)

  • Lim, Jun-Seok;Pyeon, Yong-Guk
    • The Journal of the Acoustical Society of Korea
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    • v.31 no.7
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    • pp.480-486
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    • 2012
  • In the design of electro acoustic transducer, power factor improvement circuit is more required rather than impedance matching if the driving power amplifier has little inner resistance. Many research results have been focused on the power matching circuit designing for transferring maximum power in the wideband. There are few results in the designing study on the power factor improvement for the wide band electro acoustic transducer. In this paper, we propose a new design method on the power factor improvement for the wide band electro acoustic transducer. The proposed method consists of two steps, the chebyschev matching method and the constrained optimization, respectively.

Design of a wideband cymbal transducer array (광대역 심벌 트랜스듀서 배열 설계)

  • Kim, Donghyun;Roh, Yongrae
    • The Journal of the Acoustical Society of Korea
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    • v.39 no.3
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    • pp.170-178
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    • 2020
  • Cymbal transducers are often used as an array rather than single because they have a high quality factor and low energy conversion efficiency. When used as an array, there occurs a big change in the frequency characteristics of the array due to the interaction between constituent transducers. In this study, we designed the structure of a cymbal transducer array to have ultra-wideband characteristics using this property. First, cymbal transducers with specific center frequencies were designed. Then, a 2×2 planar array was constructed with the designed transducers, where the cymbal transducers were arranged to have same or opposite polarization directions. For this structure, we analyzed the effect of the difference in the center frequency of and the spacing between the constituent transducers on the acoustical characteristics of the array. Based on the analysis, we designed the structure of the cymbal transducer array to have the widest possible bandwidth.

A Astudy on Bandwidth Enhancement of a Ultrasonic Transducer with a Taper (Taper형 초음파 진동자의 대역폭 개선에 관한 연구)

  • 정봉규
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.35 no.3
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    • pp.312-322
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    • 1999
  • A ultrasonic transduce with a single acoustic matching layer has been designed as an attempt to increase the bandwidth of underwater transducer. The wideband resonance condition was accomplished by attaching a single matching layer on the front face of a ceramic resonator composed of a piezoelectric bar, a taper part and a head part. A modified Mason's model was used for the performance analysis and the design of transducers, and the constructed transducers were tested experimentally and numerically by changing the impedance and thickness of the matching layer in the water tank.The obtained results are summarized as follows:1. Measured resonant and antiresonant frequencies of the piezoelectric transducer with no matching layer in air were 24.7 kHz and 25.6 kHz, respectively. 2. Two resonant frequencies of the piezoelectric transducer with a single matching layer were 21.7 kHx and 26.9 kHz, respectively, in air and 21.4 kHz and 22.7 kHz, respectively, with a water load.3. Two distinct resonance peaks in the transmitting voltage response(TVR) of the developed transducer were observed at 22.0 kHz and 25.8 kHz, respectively, with center frequency of 24.0 kHz. The values of TVR at these frequencies were 130.1 dB re $1 \muPa$/V at 22.0 kHz and 128.5 dB re $1 \muPa$/V at 25.8 kHz, respectively.Reasonable agreement between the experimental results and the numerical values was achieved.

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Design of Dual-band Ortho-mode Transducer for Ka-band VSATs (Ka 대역 VSAT용 이중대역 직교모드변환기 설계)

  • Lee, Hongyeol;Uhm, Manseok;Yun, Sohyeun;Yom, Inbok;Kim, Hyunsoo;Park, Jeongwoo
    • Journal of Satellite, Information and Communications
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    • v.8 no.3
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    • pp.47-51
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    • 2013
  • In this paper, we present design and test results of a Ka-band dual-band ortho-mode transducer (OMT) for use in a feed assembly for the very small aperture terminals (VSATs). The designed ortho-mode transducer have wideband characteristics to separate the signals that have two orthogonal linear polarizations operating at 20GHz of receive frequency band and at 30GHz of transmit frequency band. In addition, in order to reduce the volume of the feed assebly, a Boifot based ortho-mode transducer has been designed with a dual-band. Experimental results for the design verification, the return loss in the receive band and in the transmit band for the horizontal polarization showed over 20dB and 21dB, respectively, and for the vertical polarization showed over 20dB and 24dB, respectively. The port isolation for the horizontal polarization and the vertical polarization showed over 43dB and 52dB, respectively, in the receive band and in the vertical band.

Optimization of Slanted and Chirp IDT Configurations for Realizing and Propagating Surface Acoustic Wave with Wide Bandwidth (광대역 표면탄성파 구현을 위한 slanted 및 chirp IDT의 최적화)

  • Lee, Tae-Yoon;Fu, Chen;Lee, Kee-Keun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.12
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    • pp.1730-1736
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    • 2013
  • Slanted and chirp interdigital transducer(IDT) configurations were studied for generating the surface acoustic wave(SAW) with wide bandwidths on a piezoelectric substrate. These devices can be applied to manipulate optical path of light along the waveguide, ultimately used for optical switches and holographic image implementation. Prior to fabrication, the coupling of modes(COM) modeling and simulation were performed to extract optimal design parameters. The optimally designed wideband device showed wide bandwidth of 30MHz, low insertion loss of -25dB, and abrupt side suppression ratio (SSR). Several design conditions were determined during device implementation, such as slanted angle, aperture length, number of fingers, and central frequencies of IDTs. These factors were experimentally analyzed and described in details in this paper.