Title :
Analysis of a three-layered piezoelectric ceramic transformer filter
Author :
Kim, Jung-Hyun ; Han, Deuk-Young ; Nam, Moon-Hyon ; Kang, Sung-Mo
Author_Institution :
Philips Ind. (Korea), Seoul, South Korea
fDate :
6/1/1995 12:00:00 AM
Abstract :
A transformer filter is fabricated with three piezoelectric ceramic disk transducers and two sheets of thin insulator. Its equivalent circuit is derived from the Mason´s model of a thickness-driven piezoelectric transducer. The electric input near its fundamental resonance frequency is applied to the center transducer and the output voltages across the left and right transducers are connected in parallel or in series to the resistor load. The load characteristics at resonance frequencies under various resistor loads and the frequency characteristics near the resonance frequency under no load have been investigated. Moreover, symbolic expressions for input impedances, voltage ratios, resonance frequencies, phase angles between the input and output voltages, and bandwidths have been derived. The values calculated from those symbolic expressions are shown to agree well with the measurement values
Keywords :
crystal filters; equivalent circuits; piezoelectric transducers; Mason´s model; ceramic disk transducers; equivalent circuit; frequency characteristics; fundamental resonance frequency; input impedances; load characteristics; output voltages; phase angles; piezoelectric ceramic transformer filter; resonance frequencies; symbolic expressions; thickness-driven piezoelectric transducer; voltage ratios; Ceramics; Equivalent circuits; Filters; Impedance; Piezoelectric transducers; Power transformer insulation; Resistors; Resonance; Resonant frequency; Voltage;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
