Crystal, ceramic, and mechanical filters in Japan

Onoe, Morio

doi:10.1109/proc.1979.11204

Cited by 13 publications

(1 citation statement)

References 10 publications

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“…Piezoelectric resonance devices have also been very important 1–3,20–23 . Piezoelectric wave filters have been used in communication systems such as the intermediate frequency (IF) filters in amplitude modulation (AM) and frequency modulation (FM) broadcasting systems.…”

Section: Introductionmentioning

confidence: 99%

Layered Piezoelectric Ceramics for Fine‐Tolerance Resonator Applications

Andõ

Kimura

Minamikawa

et al. 2005

Int J Applied Ceramic Tech

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Double‐layered piezoelectric ceramic resonators were fabricated using layer stacking with lead–titanate‐based ceramics and strontium–bismuth–niobate (SBN)‐based ceramics, which are extremely stable against temperature changes or high‐temperature retention. Single‐mode resonant characteristics of the second harmonic thickness‐extensional (TE2) mode vibration can easily be obtained in those resonators. The dispersion curves of the TE2 vibrations were calculated and the results can explain the single‐mode resonant phenomenon in the TE2 mode. SBN‐based ceramic materials are quite adequate for the fine‐tolerance resonator applications, because their electromechanical coupling coefficients are sufficiently small. Strontium site substitutions for SBN improved the temperature coefficient of frequency.

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Section: Introductionmentioning

confidence: 99%

Layered Piezoelectric Ceramics for Fine‐Tolerance Resonator Applications

Andõ

Kimura

Minamikawa

et al. 2005

Int J Applied Ceramic Tech

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Energy trapping of backward‐wave width‐extensional vibrations in piezoelectric strips and its application to filters

Watanabe

Shimizu

1984

Electron. Comm. Jpn. Pt. I

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For the purpose of extending the useful range of trapped‐energy resonators and filters up to the middle band less than a few MHz, the energy trapping of the width‐extensional vibrations in a thin piezoelectric strip is studied. Since the width‐extensional vibration exhibits a dispersion characteristic of the high‐cut type in most piezoelectric materials, the backward‐wave energy trapping needs to be applied. As realistic methods, two approaches are discussed. In one of them, the areas on both sides of the excitation part at the center of the strip are short‐circuited by the electrode. In the other method, this portion is made unpolarized. In each approach, the energy trapping of the width‐extensional vibration is realized if the electrode in the excitation part is made a partial electrode with its width narrower than the strip width. A clean resonant response with few unwanted modes is obtained. A method for fabrication and experimental results are reported for a ladder filter and a single‐mode three‐terminal filter. Effectiveness of this device for a filter in the middle band is indicated.

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Energy trapping of higher‐harmonic width vibrations in piezoelectric strips and its application to filters

Watanabe

Shimizu

1989

Electron Comm Jpn Pt III

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The energy trapping of the higher‐harmonic width‐extensional and width‐shear vibrations in a piezoelectric ceramic strip is studied based on the dispersion characteristics of these modes. By the use of energy trapping of the higher‐harmonic width vibrations, new small‐sized trapped‐energy resonators and filters that can be used at the high‐frequency range beyond several megahertz are developed. In the resonator and filter using a higher‐harmonic width vibration, it is necessary to excite strongly the width vibration of a specific order and to suppress all other vibrations. In this paper, a new electrode configuration is proposed for this purpose by taking into account the stress distribution of the mode. In addition, this method is used for fabrication of 4.5 and 10.7 MHz trapped‐energy filters using the 3rd‐harmonic width‐extensional vibration and the trapped‐energy resonators using the 2nd, 3rd‐ and 4th‐harmonic width‐extensional vibrations.

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Crystal, ceramic, and mechanical filters in Japan

Cited by 13 publications

References 10 publications

Layered Piezoelectric Ceramics for Fine‐Tolerance Resonator Applications

Layered Piezoelectric Ceramics for Fine‐Tolerance Resonator Applications

Energy trapping of backward‐wave width‐extensional vibrations in piezoelectric strips and its application to filters

Energy trapping of higher‐harmonic width vibrations in piezoelectric strips and its application to filters

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