Lorentz force driven mechanical filter/mixer designs for RF applications
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United States of America Patent
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Nov 16, 2004
Grant Date -
Aug 5, 2004
app pub date -
Nov 21, 2002
filing date -
Apr 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.times.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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