Wideband Unidirectional Interdigital Surface Wave Transducers

Hartmann, C.S.; Jones, W.S.; Vollers, H.G.

doi:10.1109/t-su.1972.29689

Cited by 55 publications

(3 citation statements)

References 5 publications

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“…• SAW transversal filters using three-phase unidirectional transducers (UDTs) [5,15,24,25,30,33] and/or withdrawal weighting [19], • SAW matched filters and correlators [4,6,31,34], • Tunable SAW filters [13,18,26], • Programmable filters using chirp-Z transform [27], • SAW delay lines and oscillators [11], etc.…”

Section: IImentioning

confidence: 99%

Clinton Sylvester Hartmann: His achievements and our unwritten stories

Hashimoto

2013

2013 IEEE International Ultrasonics Symposium (IUS)

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A brilliant super-star in the SAW community, Clinton Sylvester Hartmann passed away in Dallas, TX, on February 4, 2013, at the age of 68. This article reviews Clinton's professional career and achievements at first, and then a few stories between Clinton and me are given. The stories tell how deeply Clinton contributed to my career up and early achievements. They also show how Clinton motivated, trained, and directed one young engineer.

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Section: IImentioning

confidence: 99%

Clinton Sylvester Hartmann: His achievements and our unwritten stories

Hashimoto

2013

2013 IEEE International Ultrasonics Symposium (IUS)

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“…Thus, low-loss ADLs typically adopt unidirectional transducers (UDT) to mitigate such type of loss [23]. Multi-phase transducers [24], [25], or single-phase unidirectional transducers (SPUDT) have been demonstrated [26]- [32]. These designs have embedded distributed acoustic reflectors formed by grounded or floating electrodes in an asymmetrical arrangement with respect to the signal electrodes.…”

Section: Introductionmentioning

confidence: 99%

Low-Loss and Wideband Acoustic Delay Lines

Manzaneque

Yang

et al. 2019

IEEE Trans. Microwave Theory Techn.

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This paper demonstrates low-loss acoustic delay lines based on shear-horizontal waves in thin-film LiNbO3 for the first time. Due to its high electromechanical coupling, the shear-horizontal mode is suited for producing devices with large bandwidths. Here we show that shear-horizontal waves in LiNbO3 thin films are also excellent for implementing low-loss acoustic delay lines based on unidirectional transducers. The high acoustic reflections and large transducer uni-directionality induced by the mechanical loading of the electrodes on a LiNbO3 thin film provide a great trade-off between delay line insertion loss and bandwidth. The directionality for two different types of uni-directional transducers has been characterized. Delay lines with variations in the key design parameters have been designed, fabricated and measured. One of our fabricated devices has shown a group delay of 75 ns with an IL below 2 dB over a 3 dB bandwidth of 16 MHz centered at 160 MHz (FBW=10%). The measured insertion loss for other devices with longer delays and different numbers of transducer cells are analyzed, and the loss contributing factors and their possible mitigation are discussed.

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“…SAW devices have been widely used in wireless communication systems, such as a band pass filter [1][2]. SAW devices which operate as frequency selection filter consist of fine-pitch metal comb electrodes and a piezoelectric substrate.…”

Section: Introductionmentioning

confidence: 99%

ST-quartz/LiTaO3 direct bonding using SiO2 amorphous layers with VUV/O3 pre-treatment for a novel 5G surface acoustic wave device

Suzaki

Kuwae

Okada

et al. 2016

2016 International Conference on Electronics Packaging (ICEP)

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This paper describes a novel ST-cut quartz (STquartz) /LiTaO 3 (LT) direct bonding for surface acoustic wave (SAW) devices of next 5G mobile communication. The ST-quartz and LT were bonded to fabricate temperature compensated piezoelectric substrates using amorphous SiO 2 (α-SiO 2 ) intermediate layers. The α-SiO 2 thin layer was prepared on each substrate by ion beam sputtering (IBS) to realize highly active bonding interfaces and treated by vacuum ultraviolet irradiation in the presence of oxygen gas (VUV/O 3 ). Then they were bonded under pressure of 5 MPa at 200 °C for 15 min in 100 kPa vacuum atmosphere. The tensile strength of 2. MPa was achieved in α- SiO 2 substrate which is six times stronger than other samples; without intermediate layers or VUV/O 3 pre-treatment. In addition, VUV/O 3 bonding was compared with Mega-sonic bonding. VUV/O 3 treated sample with AIB method slightly increase the bonding strength and achieved the same level ofMega-sonic bonding sample with AIB. Hence, it is indicated that AIB method could prepare the considerably activated surface even using low vacuum condition and affect effectively to heteromonocrystalline bonding. This result suggested the proposed STquartz/LT direct bonding is a promising technique for future 5G SAW devices.

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Wideband Unidirectional Interdigital Surface Wave Transducers

Cited by 55 publications

References 5 publications

Clinton Sylvester Hartmann: His achievements and our unwritten stories

Clinton Sylvester Hartmann: His achievements and our unwritten stories

Low-Loss and Wideband Acoustic Delay Lines

ST-quartz/LiTaO3 direct bonding using SiO2 amorphous layers with VUV/O3 pre-treatment for a novel 5G surface acoustic wave device

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