Optimum leaky-SAW cut of LiTaO/sub 3/ for minimised insertion loss devices

Hashimoto, Ken-ya; Yamaguchi, M.; Mineyoshi, S.; Kawachi, O.; Ueda, Masahiko; Endoh, G.

doi:10.1109/ultsym.1997.663019

Cited by 42 publications

(19 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The authors also fabricated the conventional AI-IDTslLiTa03 resonator for reference. In order to minimize a propagation-loss, the Al thickness and rotation angle of the LiTa03 in the conventional structure are often selected to approximately O.lA and 42°Y, respectively [2]. Therefore, the authors fabricated the SAW resonator for reference using AI IDTs(0.lA)/42°YX-LiTa03, which has same IDTs design parameters as the proposed new structure.…”

Section: Methodsmentioning

confidence: 99%

High Q SAW resonator using upper-electrodes on grooved-electrodes in LiTaO<inf>3</inf>

Kimura

Kadota

Ida

2010

2010 IEEE MTT-S International Microwave Symposium

View full text Add to dashboard Cite

AI-electrodes on 36-48°YX-LiTaOJ substrates have been widely used in surface acoustic wave (SAW) filters and SAW duplexers because of having an optimum electro mechanical coupling factor, reflection coefficient and good Q factor. In this paper, authors proposed and constructed a new SAW structure composed of upper AI-electrodes accumulated on lower grooved Cu-electrodes in the LiTaOJ substrate, which has approximately same electro-mechanical coupling factor and reflection coefficient as the AI-electrodes (O.1A.)/36-48°YX-LiTaOJ in order to realize high Q-factor. As the result, the SAW resonator having superior Q-factor was realized compared with that of AI electrodes(O.1A.)/42°YX-LiTaOJ substrates .

show abstract

Section: Methodsmentioning

confidence: 99%

High Q SAW resonator using upper-electrodes on grooved-electrodes in LiTaO<inf>3</inf>

Kimura

Kadota

Ida

2010

2010 IEEE MTT-S International Microwave Symposium

View full text Add to dashboard Cite

show abstract

“…Figure 7 shows the phase velocity dependence on the metallization ratio. (This calculation used the free VCAL and FEMSDA software developed by Hashimoto and Yamaguchi [6].) The electrode film thickness normalized by the wavelength was 0.1.…”

Section: Ladder-type Saw Filtermentioning

confidence: 99%

High-frequency SAW duplexer with low-loss and steep cut-off characteristics

Matsukawa

Tsutsumi

Inoue

et al.

2002 IEEE Ultrasonics Symposium, 2002. Proceedings.

Self Cite

View full text Add to dashboard Cite

“…This has been used to trim the well known 36 YX LiTa03 from 36° to 42° in order to obtain better device performance, demonstrating the importance of the layer thickness as a parameter in selecting a pseudo-SAW orientation. 51 Finally the effect of other layer materials such as gold and platinum for the pseudo SAWs has been discussed in the literature. 25 ' 26 ' 49 ' 50 One of the interesting aspects of the heavier layers is that the merging of the pseudo SAWs to the GSAWs occurs at thinner and therefore more practical layer thicknesses.…”

Section: Properties Of Solutions In Layered Structuresmentioning

confidence: 99%

PSEUDO AND HIGH VELOCITY PSEUDO SAWs

Cunha

2000

Int. J. Hi. Spe. Ele. Syst.

View full text Add to dashboard Cite

This article discusses the characteristics of pseudo surface waves (PS AWs) and high velocity pseudo surface waves (HVPSAWs). The fundamental properties of these waves, the matrix method formulation, the different solution types due to crystal symmetry, early experiments on HVPSAWs, and practical applications of pseudo surface acoustic waves serve as an introduction. The solutions to the pseudo modes are discussed by analyzing the boundary condition function for several orientations. The relation between the radiating partial modes and the sagittal plane bulk slowness reveals new characteristics of the different symmetry types of H VPS AW, and helps classify and understand the pseudo modes. The acoustoelectric Poynting vector is used along different crystal symmetry orientations to reveal and discuss the pseudo SAW characteristics: penetration depth, declination of the power vector, and an estimation of power flow angle. Experimental data and numerical solutions of HVPS AW and PS AW along selected planes and orientations are discussed. This article concludes with a brief analysis of layered structures on different symmetry type substrates and a discussion of the layered pseudo surface wave properties. 203 Int. J. Hi. Spe. Ele. Syst. 2000.10:1069-1109. Downloaded from www.worldscientific.com by UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN on 03/11/15. For personal use only.204 Int. J. Hi. Spe. Ele. Syst. 2000.10:1069-1109. Downloaded from www.worldscientific.com by UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN on 03/11/15. For personal use only. Early Experiments on HVPSA WLike the PSAW, the experimental evidence for the HVPSAW goes back over two decades. Some of the early experiments that detected the HVPSAW classified this wave as: "longitudinal bulk wave," "surface skimming bulk wave," "shallow bulk acoustic wave," or "quasi-bulk acoustic surface wave"; mostly due to the proximity of the phase velocity to the planar longitudinal bulk wave velocity in the direction of propagation. 5 ' 6 ' 7 ' 8 ' 910 The name "surface skimming bulk wave" has also been used for both PSAW and HVPSAW in early publications. 6 ' 11 Since a bulk acoustic wave, BAW, in a piezoelectric material does not satisfy the mechanically free boundary conditions, the mode experimentally identified could not be a BAW .The existence of an independent high-velocity pseudo SAW mode was identified by researchers from Brillouin scattering experiments on cubic materials. 12 Jhunjhunwala also discussed the pseudo SAWs, grouping them as first or second order pseudo SAWs, according to the number of radiating partial modes. 13 As mentioned in 1.2, the HVPSAW might have one or two radiating partial modes, depending on the symmetry of the orientation of propagation. Therefore a classification according to the number of radiating partial modes is not appropriate. Reference 12 estimates the HVPSAW to have high loss for the gallium arsenide, GaAs, orientations discussed in that paper. This is not the case for other materials and orientations as discussed in this pape...

show abstract

Optimum leaky-SAW cut of LiTaO/sub 3/ for minimised insertion loss devices

Cited by 42 publications

References 20 publications

High Q SAW resonator using upper-electrodes on grooved-electrodes in LiTaO<inf>3</inf>

High Q SAW resonator using upper-electrodes on grooved-electrodes in LiTaO<inf>3</inf>

High-frequency SAW duplexer with low-loss and steep cut-off characteristics

PSEUDO AND HIGH VELOCITY PSEUDO SAWs

Contact Info

Product

Resources

About