Article comprising a micro-machined filter

An article for frequency discrimination operable to receive a first signal having a first bandwidth including a desired frequency, and further operable to deliver a second signal having a second bandwidth including the desired frequency, wherein the second bandwidth is narrower than the first bandwidth, comprising:

• a magnetic field;
• a movable member having a cantilevered portion that resonates at the desired frequency and a beam portion that resonates at a frequency different from the desired frequency, wherein the cantilevered portion depends from the beam portion;
• a drive circuit that receives the first signal, the drive circuit comprising a drive conductor, at least a portion of which drive conductor is disposed on a surface of the beam portion and relative to the magnetic field such that a generated force is directed orthogonally to the surface;
• and
• a detection circuit comprising a detection conductor, at least a portion of which detection conductor is disposed on a surface of the cantilevered portion and relative to the magnetic field such that the second signal is induced therein.

A radio comprising:

• an antenna that receives (i) a first signal comprising a plurality of modulated RF carrier signals having frequencies within first band, and (ii) undesired signals having frequencies outside of the first band;
• a first filter having a first pass band substantially equal to the first band, the first filter operable to generate a second signal comprising substantially all the modulated RF carrier signals and substantially none of the undesired signals;
• an amplifier that amplifies the second signal;
• a tunable downconverter that receives the amplified second signal and generates a third signal by reducing the frequencies of the modulated RF carrier signals comprising the second signal such that a selected one of the down-converted modulated RF carrier signals has a desired down-converted frequency;
• a second filter having a second pass band, wherein the desired down-converted frequency is within the second pass band, the second filter comprising:
• a first magnetic field;
• a first movable member, at least a first portion of which resonates at a center frequency of the second pass band;
• a first drive circuit that receives the third signal, the first drive circuit comprising a drive conductor, at least a portion of which drive conductor is disposed on a surface of the first portion of the first movable member and relative to the first magnetic field such that a generated force is directed orthogonally to the surface;
• a first detection circuit comprising a detection conductor, at least a portion of which detection conductor is disposed on a surface of the first portion of the first movable member and relative to first magnetic field such that a voltage is induced therein;
• wherein a fourth signal comprising a signal having the down-converted frequency and substantially no other down-converted modulated RF carrier-signal frequencies is induced in the portion of the detection conductor in response to resonant movement of the first portion of the first movable member;
• and
• a demodulator for demodulating the one selected down-converted modulated RF carrier signal.

A radio comprising:

• an antenna that receives (i) a first signal comprising a plurality of modulated RF carrier signals having frequencies within a first band, and (ii) undesired signals having frequencies outside of the first band;
• a first filter having a first pass band substantially equal to the first band, the first filter operable to generate a second signal comprising substantially all the modulated RF carrier signals and substantially none of the undesired signals;
• an amplifier that amplifies the second signal;
• a tunable downconverter that receives the amplified second signal and generates a third signal by reducing the frequencies of the modulated RF carrier signals comprising the second signal such that a selected one of the down-converted modulated RF carrier signals has a desired down-converted frequency;
• a second filter having a second pass band, wherein the desired down-converted frequency is within the second pass band, the second filter comprising:
• a first magnetic field;
• a first movable member having a cantilevered portion that resonates at a center frequency of the second pass band and a beam portion that resonates at a frequency different from said center frequency, wherein the cantilevered portion depends from the beam portion;
• a first drive that receives the third signal, the first drive circuit comprising a drive conductor, at least a portion of which drive conductor is disposed on a surface of the beam portion and relative to the first magnetic field such that a generated force is directed orthogonally to the surface;
• a first detection circuit comprising a detection conductor, at least a portion of which detection conductor is disposed on a surface of the first portion of the cantilevered portion and relative to the first magnetic field such that a voltage is induced therein;
• wherein, a fourth signal comprising a signal having the down-converted frequency and substantially no other down-converted modulated RF carrier-signal frequencies is induced in the portion of the detection conductor in response to resonant movement of the cantilevered portion of the first movable member;
• and
• a demodulator for demodulating the one selected down-converted modulated RF carrier signal.