Yulin Huang   Jingfu Bao   Xinyi Li   Benfeng Zhang   Luyan Qiu   Tatsuya Omori   Ken Ya Hashimoto   
IEEE International Ultrasonics Symposium, IUS 2018-October 2018年12月
This paper proposes a technique to analysis SAW scattering at discontinuity in grating structures using the hierarchical cascading technique. The traveling wave excitation is applied to generate a specific SAW mode. Then the displacement distribut...
Xinyi Li   Jingfu Bao   Yulin Huang   Benfeng Zhang   Tatsuya Omori   Ken Ya Hashimoto   
IEEE International Ultrasonics Symposium, IUS 2018-October 2018年12月
This paper describes application of the hierarchical cascading technique (HCT)to the 3D FEM analysis of transverse mode behaviors in Surface acoustic wave (SAW)devices. Two methods are implemented; one is impedance calculation, and another is calc...
Benfeng Zhang   Tao Han   Xinyi Li   Yulin Huani   Tatsuya Omori   Ken Ya Hashimoto   
IEEE International Ultrasonics Symposium, IUS 2018-October 2018年12月
This paper proposes a technique to estimate surface acoustic wave (SAW) power flow angle (PFA) in periodic grating structures. First, the thin plate model is extended to take into account non-zero PFA. The relation between the lateral wavenumber a...
Yulin Huang   Jingfu Bao   Xinyi Li   Benfeng Zhang   Gongbin Tang   Tatsuya Omori   Ken Ya Hashimoto   
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 65(10) 1905-1913 2018年10月
This paper investigates the influence of coupling between Rayleigh and shear-horizontal (SH) surface acoustic waves (SAWs) on rotated Y-cut LiNbO3 to their electromechanical coupling. For the purpose, a coupling-of-mode (COM) model including the c...
Xinyi Li   Jingfu Bao   Yulin Huang   Benfeng Zhang   Gongbin Tang   Tatsuya Omori   Ken ya Hashimoto   
Microsystem Technologies 24(7) 2991-2997 2018年7月
This paper investigates applicability of double raised borders to the piston mode film bulk acoustic resonator (FBAR). It is shown that it offers significant improvement of the quality factor at the anti-resonance without sacrificing the spurious ...
Fumiaki Ukaji   Chang Jun Ahn   Tatsuya Omori   Ken Ya Hashimoto   
Proceedings of the IEEE International Conference on Industrial Technology 2016-May 860-865 2016年5月
Multi-user multi-input multi-output (MU-MIMO) can achieve more transmission speed and multi-user diversity. Furthermore, since frequency symbol spreading (FSS) can mitigate the effect of frequency selective fading, it is useful for improving the B...
Masaya Okamura   Chang Jun Ahn   Tatsuya Omori   Ken Ya Hashimoto   
2015 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2015 532-536 2016年3月
Massive MIMO has been recognized as promising ways to provide high speed data transmission. However, since the number of pilot symbol is proportionally depending on the number of transmit antenna, the total transmission rate of massive MIMO would ...
Kotaro Abe   Chang Jun Ahn   Tatsuya Omori   Ken Ya Hashimoto   
2015 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2015 417-421 2016年3月
Recently, visible light communication(VLC) is widely researched due to the spreading of LED usage. It satisfies demands of ubiquity and high speed communication. However, it is impossible to transmit the phase information and frequency information...