Title :
Fabrication and performance of 40-60 MHz annular arrays
Author :
Brown, Jeremy A. ; Morton, Christine E. ; Lockwood, Geoffrey R.
Author_Institution :
Queen´´s Univ., Kingston, Ont., Canada
Abstract :
The fabrication and performance of miniature high frequency (40-60 MHz) annular arrays is described. The arrays were fabricated using photolithography to define the electrode pattern, and ultrasonic wire bonding to make electrical contacts. The transducers were 2 mm in diameter with seven equal area elements and a centre frequency of 50 MHz. A -6 dB two-way beam width of 75 microns was found at f/2. The radiation pattern decreased smoothly to less than -60 dB at a distance of 550 microns.
Keywords :
antenna radiation patterns; biomedical transducers; biomedical ultrasonics; electrical contacts; photolithography; ultrasonic bonding; ultrasonic transducer arrays; 2 mm; 40 to 60 MHz; 550 micron; annular array fabrication; electrical contacts; electrode pattern; photolithography; radiation pattern; transducers; two way beam; ultrasonic wire bonding; Costs; Dielectric substrates; Electrodes; Fabrication; Finite element methods; Focusing; Frequency; Machining; Phased arrays; Ultrasonic transducer arrays;
Conference_Titel :
Ultrasonics, 2003 IEEE Symposium on
Print_ISBN :
0-7803-7922-5
DOI :
10.1109/ULTSYM.2003.1293537
