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of 8
pro vyhledávání: '"Juha Ellä"'
Autor:
Qing Shang, Juha Ellä, Gvidas Sidlauskas, Edgar Schmidhammer, Jacques-Antoine Damy, Leon Van den Oever
Publikováno v:
2016 IEEE International Ultrasonics Symposium (IUS).
As the number of mobile devices is increasing at an exponential rate, the capacity of conventional base station will not be able to cope with the growth of mobile data. Small cell comes to the stage as the key solution to this problem. Since the freq
Publikováno v:
Ylilammi, M, Ellä, J, Kaitila, J & Partanen, M 2002, ' Thin film bulk acoustic wave filter ', IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 49, no. 4, pp. 535-539 . https://doi.org/10.1109/58.996574
Thin film bulk acoustic wave (BAW) resonators (FBAR) are fabricated on a silicon nitride bridge using a ZnO piezolayer on a glass substrate and surface micromachining by standard thin film technology. These resonators exhibit a coupling constant kt2
Publikováno v:
The European Conference on Wireless Technology, 2005..
The design of the RF front-end part in modern cellular phones is becoming increasingly complex and demanding due to increasing number of frequency bands and modes that the phone needs to operate in. One of the main components of the RF front-end is t
Publikováno v:
IEEE Symposium on Ultrasonics, 2003.
In this paper a device structure eliminating the spurious modes arising from lateral standing Lamb waves is presented. The operating principle behind the device is described with the use of a simple model. Experimental results of ZnO and AlN based re
Autor:
Martin Handtmann, Thomas Herzog, J. Kaitila, Robert Aigner, Winfried Nessler, Lueder Elbrecht, Stephan Marksteiner, Juha Ellä
Publikováno v:
IEEE MTT-S International Microwave Symposium Digest, 2003.
Performance parameters of BAW devices are reviewed and ranked corresponding to their importance for RF-filters in mobile phone applications. The most important performance parameters - such as resonator bandwidth and Q-values - critically depend on t
Publikováno v:
Digest. International Electron Devices Meeting.
RF-MEMS filters will substitute conventional filters in mobile communication under certain technical and commercial conditions. Key performance parameters and requirements are discussed in detail. Two different approaches for RF-MEMS filters are revi
Autor:
J.V. Knuuttila, Martti M. Salomaa, J. Westerholm, T. Makkonen, Juha Ellä, J. Kaitila, P. T. Tikka
Publikováno v:
1999 IEEE MTT-S International Microwave Symposium Digest (Cat. No.99CH36282).
The ultrasonic vibrations of a solidly mounted resonator are probed utilizing a scanning laser interferometric technique. The vibrations are also simulated using a model of a solidly mounted resonator and applying 2D FEM modeling for the solution of
Publikováno v:
Kaitila, J, Ylilammi, M, Molarius, J, Ellä, J & Makkonen, T 2001, ZnO based thin film bulk acoustic wave filters for EGSM band . in 2001 IEEE Ultrasonics Symposium Proceedings . IEEE Institute of Electrical and Electronic Engineers, pp. 803-806, IEEE International Ultrasonic Symposium 2001, Atlanta, Georgia, United States, 7/10/01 . https://doi.org/10.1109/ULTSYM.2001.991844
We present results for a ZnO based filters for the mobile Extended GSM (EGSM) Rx band centered at 942.5 MHz. Our devices are of the SMR type. The acoustical isolation from the glass substrate is achieved by a tungsten-silicon dioxide quarter waveleng
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f7232f0ec357e82ce043d409f5e3468
https://cris.vtt.fi/en/publications/f4275457-ad7d-454e-aca5-3e7440b07f30
https://cris.vtt.fi/en/publications/f4275457-ad7d-454e-aca5-3e7440b07f30