摘要 |
A Lorentz force-driven mechanical resonator apparatus that utilizes a high-Q resonant structure as both a mixing device and a high-Q bandpass filter. Specifically, an external time varying, but quasistatic, magnetic field is applied to the resonating device while simultaneously running a time varying electrical current through the device. The resulting Lorentz force (I x B) is proportional to the vector product of the electrical current in the bar (I) and the external magnetic field (B). Integrating such a resonant device with a magnetic field coil produces the functionality of an ideal radio frequency (RF) mixer coupled with a high-Q intermediate frequency (IF) filter. Wide tunability provides the capability to scan, or even step, an array of filters having very narrow bandwidths via a common local oscillator to a desired frequency range.
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申请人 |
THE JOHNS HOPKINS UNIVERSITY;CHAMPION, JOHN L.,;OSIANDER, ROBERT,;GIVENS, ROBERT B.,;WICKENDEN, DENNIS K.,;JABLONSKI, DANIEL G.,;HIGBIE, JAMES H.,;RADCLIFFE, SCOTT T.,;DARRIN, MARGARET A.,;KISTENMACHER, THOMAS J.,;OURSLER, DOUGLAS A., |
发明人 |
CHAMPION, JOHN L.,;OSIANDER, ROBERT,;GIVENS, ROBERT B.,;WICKENDEN, DENNIS K.,;JABLONSKI, DANIEL G.,;HIGBIE, JAMES H.,;RADCLIFFE, SCOTT T.,;DARRIN, MARGARET A.,;KISTENMACHER, THOMAS J.,;OURSLER, DOUGLAS A., |