A system for monitoring a health parameter in a person, the system comprising: a frequency synthesizer configured to generate radio waves across a range of stepped frequencies in a frequency range of 122 - 126 GHz; at least one transmit antenna (644; 844) configured to transmit the radio waves in the frequency range of 122 - 126 GHz below the skin surface of a person; a two-dimensional array of receive antennas (646; 846) configured to receive radio waves in the frequency range of 122 - 126 GHz, the received radio waves including a reflected portion of the transmitted radio waves; and processing circuits (694; 794) configured to output data that includes amplitude and phase data in response to the received radio waves; and a processor ((564; 552; 764) configured to derive data from at least one of the amplitude and phase data and to determine a value that is indicative of a health parameter in the person in response to the derived data; wherein the frequency synthesizer and processing circuits are integrated onto a single semiconductor substrate; further comprising at least one transmit component and multiple channel-specific receive components integrated onto the single semiconductor substrate; wherein the at least one transmit component and the at least one transmit antenna comprise two channel-specific transmit components and two transmit antennas and wherein the multiple channel-specific receive components and the two-dimensional array of receive antennas comprises four channel-specific receive components and four receive antennas; wherein the four channel-specific receive components and the four receive antennas are collocated at opposite corners of the single semiconductor substrate; wherein the two channel-specific transmit components each include an interface that provides an electrical interface between circuits of the respective two channel-specific transmit components and the respective two transmit antennas, and wherein a portion of each of the two channel-specific transmit components overlaps from a plan view perspective a portion of the respective two transmit antennas and wherein respective transmit antennas are located directly over respective interfaces of the channel-specific transmit components; and wherein the four channel-specific receive components each include an interface that provides an electrical interface between circuits of the respective four channel-specific receive components and the respective four receive antennas, and wherein a portion of each of the four channel-specific receive components overlaps from a plan view perspective a portion of the respective four receive antennas and wherein respective receive antennas are located directly over respective interfaces of the channel-specific receive components. a frequency synthesizer configured to generate radio waves across a range of stepped frequencies in a frequency range of 122 - 126 GHz; at least one transmit antenna (644; 844) configured to transmit the radio waves in the frequency range of 122 - 126 GHz below the skin surface of a person; a two-dimensional array of receive antennas (646; 846) configured to receive radio waves in the frequency range of 122 - 126 GHz, the received radio waves including a reflected portion of the transmitted radio waves; and processing circuits (694; 794) configured to output data that includes amplitude and phase data in response to the received radio waves; and a processor ((564; 552; 764) configured to derive data from at least one of the amplitude and phase data and to determine a value that is indicative of a health parameter in the person in response to the derived data; wherein the frequency synthesizer and processing circuits are integrated onto a single semiconductor substrate; further comprising at least one transmit component and multiple channel-specific receive components integrated onto the single semiconductor substrate; wherein the at least one transmit component and the at least one transmit antenna comprise two channel-specific transmit components and two transmit antennas and wherein the multiple channel-specific receive components and the two-dimensional array of receive antennas comprises four channel-specific receive components and four receive antennas; wherein the four channel-specific receive components and the four receive antennas are collocated at opposite corners of the single semiconductor substrate; wherein the two channel-specific transmit components each include an interface that provides an electrical interface between circuits of the respective two channel-specific transmit components and the respective two transmit antennas, and wherein a portion of each of the two channel-specific transmit components overlaps from a plan view perspective a portion of the respective two transmit antennas and wherein respective transmit antennas are located directly over respective interfaces of the channel-specific transmit components; and wherein the four channel-specific receive components each include an interface that provides an electrical interface between circuits of the respective four channel-specific receive components and the respective four receive antennas, and wherein a portion of each of the four channel-specific receive components overlaps from a plan view perspective a portion of the respective four receive antennas and wherein respective receive antennas are located directly over respective interfaces of the channel-specific receive components.