TY - JOUR A1 - Weinzierl, D. T1 - Investigation of Resonance Frequencies in a Crawford Cell Y1 - 2002 ER - TY - JOUR A1 - Geromiller, Hans-Peter A1 - Kost, A. T1 - Numerical calculation of non-TEM-wave field patterns in Crawford-cells JF - The european physical journal Y1 - 2001 SN - 1286-0042 VL - 14 IS - 3 SP - 193 EP - 197 ER - TY - CHAP A1 - Hahn, A. A1 - Kost, A. A1 - Jänicke, Lutz A1 - Miethner, K. T1 - Fields and shielding by eddy currents in perforated boxes T2 - Proceedings, ISTET'01, XI. International Symposium on Theoretical Electrical Engineering, August 19 - 22, 2001, Linz, Austria, Vol. 1 Y1 - 2001 SN - 3-9501491-1-2 SP - 55 EP - 60 CY - Linz ER - TY - CHAP A1 - Igarashi, H. A1 - Watanabe, Noboru A1 - Kost, A. A1 - Honma, T. T1 - Reconstruction of Planar Magnetic Charge Distribution T2 - Proceedings of the Tenth International Symposium on Applied Electromagnetics and Mechanics ISEM - Tokyo, from May 13th through 16th in 2001 Y1 - 2001 SN - 4-931455-08-5 PB - IOS Press CY - Amsterdam [u.a.] ER - TY - CHAP A1 - Jänicke, Lutz A1 - Kost, A. T1 - Efficiency Investigations on Adaptive Mesh Generation Y1 - 2001 ER - TY - THES A1 - Geromiller, Hans-Peter T1 - Entwicklung und Konstruktion einer TEM-Zelle mit gekrümmter Berandung auf der Grundlage von Untersuchungen bestehender TEM-Zellenkonzepte Y1 - 2000 ER - TY - CHAP A1 - Kupnik, Mario A1 - Ho, Min-Chieh A1 - Vaithilingam, Srikant A1 - Khuri-Yakub, Butrus T. T1 - CMUTs for air coupled ultrasound with improved bandwidth T2 - IEEE International Ultrasonics Symposium 2011, Orlando, Florida, USA, October 18-21, 2011 Y1 - 2011 SN - 978-1-4577-1252-4 SN - 978-1-4577-1253-1 SP - 592 EP - 595 PB - IEEE CY - Piscataway, NJ ER - TY - CHAP A1 - Apte, Nikhil A1 - Vaithilingam, Srikant A1 - Sarioglu, Ali Fatih A1 - Kupnik, Mario A1 - Khuri-Yakub, Butrus T. T1 - Large area 1D CMUT phased arrays for multi-modality ultrasound imaging T2 - IEEE International Ultrasonics Symposium 2011, Orlando, Florida, USA, October 18-21, 2011 Y1 - 2011 SN - 978-1-4577-1252-4 SN - 978-1-4577-1253-1 SP - 612 EP - 615 PB - IEEE CY - Piscataway, NJ ER - TY - CHAP A1 - Konetzke, Eric A1 - Rutsch, Matthias A1 - Hoffmann, Maik A1 - Unger, Alexander A1 - Golinske, René A1 - Killat, Dirk A1 - Ramadas, Sivaram Nishal A1 - Dixon, Steve A1 - Kupnik, Mario T1 - Phased array transducer for emitting 40-kHz air-coupled ultrasound without grating lobes T2 - Proceedings, IEEE International Ultrasonics Symposium (IUS), 21 Oct - 24 Oct 2015 Y1 - 2015 U6 - https://doi.org/10.1109/ULTSYM.2015.0019 PB - IEEE ER - TY - CHAP A1 - Unger, Alexander A1 - Hoffmann, Maik A1 - Ho, Min-Chieh A1 - Park, Kwan Kyu A1 - Khuri-Yakub, Butrus T. A1 - Kupnik, Mario T1 - Finite element analysis of mechanically amplified CMUTs T2 - Proceedings, 2013 IEEE International Ultrasonics Symposium N2 - We introduce the possibility of improving a single-cell capacitive micromachined ultrasonic transducer (CMUT) for air-coupled ultrasound by simply adding a hollow conical-shaped structure (horn) on top of the CMUT plate. The main objective is to improve both transmit and receive sensitivity by lowering the center-to-average displacement ratio, which for bending plate operated devices inherently is limited. In addition, for receive mode the force generated from the impinging sound pressure wave is concentrated to the center of the plate, resulting in larger signals and, in contrast to piston-shaped plates, the horn has the advantage of only moderately increasing the modal mass of the structure. By using finite element analysis and first sound pressure measurements of our modified CMUT, we demonstrate that this idea is feasible and promising for air-coupled CMUTs operating at frequencies below 150kHz, as it has been been proven to be successful for commercially available piezoelectric - driven bending plate devices as well. Y1 - 2013 U6 - https://doi.org/10.1109/ULTSYM.2013.0074 SP - 287 EP - 290 PB - IEEE ER -