This paper describes various characteristics for a width-extensional mode quartz crystal resonator. The object of this paper is to propose a new cut for a width-extensional mode quartz crystal resonator with a zero temperature coefficient, which is designated the "KT-Cut" and to clarify its frequency characteristics, frequency temperature behavior and electrical characteristics. As a result, the resonator is found to show a cubic curve in a high temperature region because an inflection temperature point is approximately 65℃, and also to have a value of R_1=89.7 to 281Ω and Q=45,000 to 180,000 in a frequency range of f=8.67 to 32.1MHz.
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