Results 251 to 260 of about 101,887 (285)
Some of the next articles are maybe not open access.
Improving manufacturability of bulk acoustic wave and surface acoustic wave devices
2011 Symposium on Piezoelectricity, Acoustic Waves and Device Applications (SPAWDA), 2011Bulk acoustic wave (BAW/FBAR) or surface acoustic wave (SAW) technologies are widely used in making filters for wireless applications [1]. While it is no longer a great challenge to make reactively sputtered piezoelectric aluminum nitride (AlN) films suitable for BAW applications [3] or to make a standard SAW filter, there are critical devices that ...
openaire +1 more source
Narrow band bulk acoustic wave filters
IEEE Ultrasonics Symposium, 2004, 2005Bulk acoustic wave (BAW) filters are competing successfully in the range of 800 MHz to 10 GHz with SAW filters. USPCS and UMTS filters require a bandwidth of 60 MHz at approximately 2 GHz (fractional BW /spl Delta/f/f/spl ap/3%). This can be realized by optimum design and high quality piezoelectric AlN which allows figure of merit, k/sup 2/Q, values of
H.P. Loebl +7 more
openaire +1 more source
Thin film bulk acoustic wave resonator
The Journal of the Acoustical Society of America, 2005The present invention is intended to provide a thin film bulk acoustic wave resonator, which has a resonant excitation portion free from damage caused by etching, a high electromechanical coupling coefficient k t 2 and a high quality coefficient Q value, and to provide a thin film bulk acoustic wave resonator having a plurality of different resonant
openaire +1 more source
Micromachined bulk acoustical-wave RF filters
Proceedings. 7th International Conference on Solid-State and Integrated Circuits Technology, 2004., 2005We present the performance of RF filters based on thin film bulk acoustical resonator (FBAR) technology for wireless communication applications. The filter is fabricated using surface micromachining processes and is hermetically sealed using wafer-level packaging with solder bumps on each electrical terminal, ready for flip-chip assembly.
null Kan Wang, P. Bradley, M. Gat
openaire +1 more source
Surface skimming bulk acoustic wave accelerometer
The Journal of the Acoustical Society of America, 1988An accelerometer includes a cantilevered pieozelectric beam mounted to a surface inside a fluid filled chassis with a proof mass attached to the beam's free end. Surface skimming bulk wave delay lines are mounted on opposing major surfaces of the beam and are responsive to strain induced therein by acceleration of the proof mass.
openaire +1 more source
High-temperature bulk acoustic wave sensors
Measurement Science and Technology, 2010Piezoelectric crystals like langasite (La3Ga5SiO14, LGS) and gallium orthophosphate (GaPO4) exhibit piezoelectrically excited bulk acoustic waves at temperatures of up to at least 1450 °C and 900 °C, respectively. Consequently, resonant sensors based on those materials enable new sensing approaches.
openaire +1 more source
Bulk acoustic wave coupled resonator filters
Proceedings of the 2002 IEEE International Frequency Control Symposium and PDA Exhibition (Cat. No.02CH37234), 2003Coupled resonator filters (CRF) are a new form of bulk acoustic wave device that involves the vertical stacking of resonators. In that regard, the CRF can be thought of as a variation on the better known stacked crystal filter (SCF). However, the CRF is actually somewhat more analogous to the monolithic crystal filter (MCF) that was a mainstay in ...
openaire +1 more source
Investigation of Shallow Bulk Acoustic Waves
The Journal of the Acoustical Society of America, 1983Abstract : This final report summarizes the most important results of the Investigation of Shallow Bulk Acoustic Waves (SBAW) program. This program was conceived on the principle that SBAW technology could lead to devices that are superior to those presently available for frequency filtering and control.
openaire +1 more source
Shallow Bulk Acoustic Wave Filters
1978 Ultrasonics Symposium, 1978K.H. Yen, K.F. Lau, R.S. Kagiwada
openaire +1 more source