NOISE REDUCTION IN NON-INVASIVE RADIO FREQUENCY ANALYTE SENSORS
A non-invasive analyte sensor that includes one or more noise reduction components provided on the receive and/or transmit components to reduce extraneous radio frequency noise. A noise reduction component can be provided on the exterior of an electrical conductor that connects the receive antenna with the receive circuitry to suppress extraneous radio frequency noise that is generated on the exterior of the electrical conductor. The noise reduction component can be any type of noise reduction device that achieves such radio frequency noise suppression. In one embodiment, the noise reduction component can be a choke.
1 . A non-invasive analyte sensor system, comprising:
a first antenna that is configured to emit radio frequency electromagnetic waves, the first antenna is positioned and arranged to transmit a radio frequency transmit signal into a target containing at least one analyte;
a second antenna that is configured to detect radio frequency electromagnetic waves, the second antenna is positioned and arranged to detect a radio frequency response resulting from transmission of the radio frequency transmit signal by the first antenna into the target containing the at least one analyte;
a transmit circuit that is electrically connectable to the first antenna, the transmit circuit is configured to generate the radio frequency transmit signal to be transmitted by the first antenna;
a transmit electrical conductor electrically connecting the transmit circuit with the first antenna;
a receive circuit that is electrically connectable to the second antenna, the receive circuit is configured to receive the radio frequency response detected by the second antenna;
a receive electrical conductor electrically connecting the receive circuit with the second antenna; and
at least one noise reducer on the receive electrical conductor between the receive circuit and the second antenna and/or on the transmit electrical conductor between the transmit circuit and the first antenna.
2 . The non-invasive analyte sensor system of claim 1 , wherein the at least one noise reducer is on the receive electrical conductor between the receive circuit and the second antenna.
3 . The non-invasive analyte sensor system of claim 2 , comprising a first radio frequency adapter connecting the receive electrical conductor to the second antenna and a second radio frequency adapter connecting the receive electrical conductor to the receive circuit, and the at least one noise reducer surrounds the first radio frequency adapter or the second radio frequency adapter.
4 . The non-invasive analyte sensor system of claim 1 , wherein the at least one noise reducer comprises a choke.
5 . The non-invasive analyte sensor system of claim 1 , wherein the at least one analyte comprises glucose, alcohol, white blood cells, or luteinizing hormone.
6 . A non-invasive analyte sensor system, comprising:
an antenna array having at least three antennas each of which is configured to emit and receive radio frequency electromagnetic waves;
a transmit circuit that is selectively electrically connectable to any one or more of the at least three antennas, the transmit circuit is configured to generate at least one transmit signal in a radio frequency range of the electromagnetic spectrum to be transmitted into a target by the one or more of the at least three antennas the transmit circuit is electrically connected to;
a receive circuit that is selectively electrically connectable to any one or more of the at least three antennas, the receive circuit is configured to receive a response detected by the one or more of the at least three antennas the receive circuit is electrically connected to resulting from transmission of the at least one transmit signal into the target containing the at least one analyte of interest;
electrical conductors electrically connecting the receive circuit with the at least three antennas;
noise reducers on the electrical conductors between the receive circuit and the at least three antennas.
7 . The non-invasive analyte sensor system of claim 6 , wherein the noise reducers comprise chokes.
8 . The non-invasive analyte sensor system of claim 6 , comprising first radio frequency adapters connecting the electrical conductors to the antennas and second radio frequency adapters connecting the electrical conductors to the receive circuit, and the noise reducers surround the first radio frequency adapters or the second radio frequency adapters.
9 . The non-invasive analyte sensor system of claim 6 , wherein the at least one analyte comprises glucose, alcohol, white blood cells, or luteinizing hormone.