A catheter adapted for use in a tubular region of the heart, has a catheter body, a deflectable intermediate section and a distal a mapping assembly that has a generally circular portion adapted to sit on or in a tubular region of the heart. The filter is a longitudinally coupled resonator type surface acoustic wave filter using an SH type surface acoustic wave, which has first and second grooves formed in a piezoelectric substrate at the top surface thereof so as to be substantially parallel to each other and spaced from each other by a predetermined distance. During browsing e-mail’s, the original e-mail is retrieved from repositories which stores sent and received e-mail’s, and is incorporated into the browsed e-mail. A read bit line is connected to a source or a drain of the sense transistor.