• Title/Summary/Keyword: Surface Acoustic Wave(SAW)

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Design and Fabrication of Reflective Array Type Wideband SAW Dispersive Delay Line

  • Choi Jun-Ho;Yang Jong-Won;Nah Sun-Phil;Jang Won
    • Journal of electromagnetic engineering and science
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    • v.6 no.2
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    • pp.110-116
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    • 2006
  • A reflective array type surface acoustic wave(SAW) dispersive delay line(DDL) with high time-bandwidth at the V/UHF-band is designed and fabricated for compressive receiver applications. This type of the SAW DDL has the properties of the relative bandwidth of 20 %, the time delay of 49.89 usec, the insertion loss of 38.5 dB and the side lobe rejection of 39 dB. In comparison with a commercial SAW DDL, the insertion loss, amplitude ripple and side lobe rejection are improved by $1.5dB{\pm}0.6dB$ and 4 dB respectively. Using the fabricated SAW DDL, the prototype of the compressive receiver is developed. It is composed of RF converter, fast tunable LO, chirp LO, A/D converter, signal processing unit and control unit. This prototype system shows a fine frequency resolution of below 30 kHz with high scan rate.

Characteristic analysis and design of a precise manipulation device using surface acoustic wave (표면탄성파를 이용한 이송장치의 IDT 형상 변화에 따른 특성 연구)

  • Eom, Jinwoo;Park, No-Cheol;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.79-83
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    • 2014
  • In this paper, SAW devices are fabricated using various IDT shape(Single/Double) to check an effect of the IDT on SAW device. And based on theory of a particle velocity moved by SAW and IDT, a particle velocity is measured and calculated. Depend on insert power, a particle velocity using Single-IDT SAW device is about two times bigger than Double-IDT SAW device and it's almost same with a theoretical different.

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Highly sensitive and selective detection of cyanide in aqueous solutions using a surface acoustic wave chemical sensor (표면음향파 화학센서를 이용한 수용액 중 시안화이온의 선택적인 고감도 검출)

  • Lee, Soo Suk
    • The Journal of the Acoustical Society of Korea
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    • v.35 no.6
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    • pp.473-479
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    • 2016
  • We report a highly selective and sensitive 200 MHz Surface Acoustic Wave (SAW) sensor that can detect cyanide ion in aqueous solution using surface immobilized thioester molecules in combination with gold nanoparticles (AuNPs). To construct the sensor device, a monolayer of thioester compound was immobilized on the SAW sensor surface. At the sensor surface, hydrolysis of thioester group by nucleophilic addition of cyanide occurred and the resulting free thiol unit bound to AuNP to form thiol-AuNP conjugate. For the signal enhancement, gold staining signal amplification process was introduced subsequently with gold (III) chloride trihydrate and reducing agent, hydroxylamine hydrochloride. The SAW sensor showed a detection ability of $17.7{\mu}M$ for cyanide in aqueous solution and demonstrated a saturation behavior between the frequency shift and the concentration of cyanide ion. On the other hand, our SAW sensor had no activities for other anions such as fluoride ion, acetate ion and sulfate ion, moreover, no significant interference observed by other anions. Finally, all the experiments were carried out in-house developed sensor and fluidics modules to obtain highly reproducible results.

Simulation of Surface Acoustic Wave Filters Using SPICE (SPICE를 사용한 표면음파 필터의 시뮬레이션)

  • Yu, Sang-Dae
    • Journal of Sensor Science and Technology
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    • v.10 no.2
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    • pp.142-147
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    • 2001
  • Using transmission-line equivalent circuit based on cross-field model for an interdigital acoustic wave transducer, an efficient simulation technique of SAW filters by SPICE is proposed. Propagation of surface acoustic wave is modeled as transmission line so that frequency-dependent circuit elements are not needed in the equivalent circuit of an interdigital transducer. Because the equivalent circuits for frequency-dependent circuit elements are not derived approximately, and a small number of circuit elements are used in the equivalent circuit for filters, simulation time is much reduced. The utility of the proposed technique is demonstrated through simulation for the characteristics of SAW filters such as insertion loss, input admittance, passband ripple, and harmonic frequency response.

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SAW ID Tag and Receiver System for Passive RFID System Application (수동형 RFID 시스템 적용을 위한 SAW ID 태그 및 수신 시스템 구현)

  • Kim, Jae-Kwon;Park, Joo-Yong;Burm, Jin-Wook
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.45 no.4
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    • pp.64-71
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    • 2008
  • SAW (Surface Acoustic Waves) ID (identification) tags have been designed and implemented for RFID (Radio frequency IDentification) systems. With SAW ID tag of pulse position encoding method, the data capacity increased 3 times compared with SAW ID tag of amplitude on/off method. Two different kinds of SAW ID tag receiver systems, heterodyne and homodyne receiver systems, were made. The direct conversion receiver showed better isolation property, 10 dB improvement than the heterodyne receiver to increase wireless interrogation distance.

A study on the Fabrication and characterization of temperature Sensor using surface acoustic wave (표면 탄성파를 이용한 온도센서의 제작 및 특성에 대한 연구)

  • Park Jae-Hong;Kim Jae-Hwan
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.4 s.181
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    • pp.139-145
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    • 2006
  • This paper presents the design and manufacturing of a sensor using SAW and delay line in order to measure temperature. SAW sensors having single and double electrodes are manufactured on the $128^{\circ}YX-LiNbO_3$ substrate, and its process is addressed. Before manufacturing, the device is simulated using a commercial finite element program. The frequency responses of the saw sensor on the temperature change is measured. Since the center frequency on the temperature change from $-30^{\circ}C$ to $80^{\circ}C$ is linearly changed, the saw sensor is applicable to measure the temperature change or strain variation.

Failure Analysis of RF SAW Filter by High Temperature Storage Test (고온저장시험에 의한 RF SAW Filter의 고장분석)

  • Kim, Young-Goo;Kim, Tae-Hong;You, Jong-Jun
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.140-144
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    • 2003
  • To investigate failure analysis of surface acoustic wave (SAW) filter for radio frequency, high temperature storage test was carried out. The failure criteria were insertion loss at passband and rejection level at stopband. As a result, the insertion loss at passband increase about 4 dB was due to damages of interdigital transducer (IDT). That is caused by poor adhesion between metal electrode(AI) and piezoelectric substrate and defects on a manufacturing process. This result indicates that good adhesion between electrode and ceramic substrate is important factor And also we investigated the demage factors of electrode. Screen possible of saw filter using high temperature storage test(HTOL) in the manufacturing phase be presented.

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A Study on RF High Power Durability of Al-Cu Alloy Electrodes Used in Ladder-type SAW(surface acoustic wave) Filters (Al-Cu 합금 전극막 구조를 갖는 사다리형 SAW filter의 RF-고전력 내구성 특성 고찰)

  • 김남철;이기선;서수정;김지수;김윤동
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.14 no.5
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    • pp.435-443
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    • 2001
  • As power durable RF SAW filters, AL-(0∼2wt%)Cu alloy multi-layered thin electrodes were deposited on 42° LiTaO$_3$ piezoelectric substrates by magnetron sputtering process, and then ladder-type RF SAW filters, satisfying the electrical specification of CDMA transmission band, were fabricated through optimizing SAW resonator structures. The temperature of film electrodes in SAW filter was increased with RF power, and reached the maxima to cause a failure of SAW filters at the cut-off frequencies of the RF filter band. As RF power increases, the electrodes of Al-Cu alloy showed higher power durability than that of pure Al. The multi-layer laminated film of Al-1wt.% Cu/Cu/Al-1wt%Cu resulted in the best power durability up to 4W of RF power. Every film electrode, however, was destroyed within seconds whenever applying a critical RF power to SAW filters, regardless of the composition and structure of film electrodes. The breakdown of film electrodes under FR power seems to believe due to the fatigue of electrodes caused by repetitive cyclic stress of surface acoustic wave, which is amplified as RF power increases.

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Size-based Separation of Yeast Cell by Surface Acoustic Wave-induced Acoustic Radiation Force (음향방사력을 이용한 효모세포의 크기별 분리)

  • Raihan Hadi Julio;Muhammad Soban Khan;Mushtaq Ali;Ghulam Destgeer;Jinsoo Park
    • Journal of the Korean Society of Visualization
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    • v.21 no.3
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    • pp.93-100
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    • 2023
  • The yeast Saccharomyces cerevisiae (S. cerevisiae) is considered an ideal eukaryotic model and has long been recognized for its pivotal role in numerous industrial production processes. Depending on the cell cycle phases, microenvironment, and species, S. cerevisiae varies in shape and has different sizes of each shape such as singlets, doublets, and clusters. Obtaining high-purity populations of uniformly shaped S. cerevisiae cells is crucial in fundamental biological research and industrial operations. In this study, we propose an acoustofluidic method for separating S. cerevisiae cells based on their size using surface acoustic wave (SAW)-induced acoustic radiation force (ARF). The SAW-induced ARF increased with cell diameter, which enabled a successful size-based separation of S. cerevisiae cells using an acoustofluidics device. We anticipate that the proposed acoustofluidics approach for yeast cell separation will provide new opportunities in industrial applications.