Abstract: A method for non-invasively identifying a location of a mass or tumor including: providing a patient with a possible mass or tumor; providing a detector including one or more resonant sensors, each sensor including at least one loop resonator, at least one cavity resonator, or at least one waveguide resonator; detecting resonant frequencies at different locations on the patient's skin near locations of the mass or possible tumor; and locating the mass or tumor by noting a location of an atypical resonant frequency.

Abstract: A method for non-invasively identifying a location of a subcutaneous tumor comprising: providing a patient with a possible subcutaneous tumor; providing a detector comprising one or more radio-frequency (RF) planar resonant loop sensors, each sensor comprising a planar resonant loop and an element disposed within and co-planar with a loop formed by the planar resonant loop; creating a first localization map of resonant frequencies of an area including the possible tumor using the detector; and creating a second localization map of |s11| reflection coefficients of the area including the possible tumor using the detector.

Abstract: Provided herein are devices and methods for use of a planar inductive resonant coupler comprising: a planar loop resonator comprising forming a single loop; wherein two or more dimensions of the planar loop resonator are sized to tune a coupler resonance in a gap that forms an inner perimeter of the planar loop resonator; and wherein the planar loop resonator is configured to establish electric fields across the gap and is configured to be coupled to circuitry, to receive or to transmit electromagnetic energy to or from a surrounding environment, and to transmit the electromagnetic energy to the circuitry.

Abstract: Provided herein are systems and methods for detecting blood vessels, including a system including a resonator mounted on a substrate; and a processor connected to the resonator; wherein the resonator and the processor are configured to detect at least one of resonant frequencies and reflection coefficient magnitudes when the resonator is applied to a skin surface of a subject.

Abstract: A planar inductive resonant coupler comprising a circular planar loop antenna; and an element disposed within and co-planar with a loop formed by the antenna; wherein one or more antenna or element dimensions are sized to tune a coupler resonance of the coupler. A method of locating a subcutaneous planar inductive resonant coupler including: providing the subcutaneous planar inductive resonant coupler; providing a locating device configured to couple with the subcutaneous planar inductive resonant coupler; placing the locating device within a coupling range of the subcutaneous planar inductive resonant coupler; plotting a location for each of one or more resonant frequencies of the locating device with respect to a surface under which the subcutaneous planar inductive resonant coupler is expected to be located; and identifying a location for a specific resonant frequency of the subcutaneous planar inductive resonant coupler on the surface.

Abstract: A method for non-invasively identifying a location of a subcutaneous tumor comprising: providing a patient with a possible subcutaneous tumor; providing a detector comprising one or more radio-frequency (RF) planar resonant loop sensors, each sensor comprising a planar resonant loop and an element disposed within and co-planar with a loop formed by the planar resonant loop; creating a first localization map of resonant frequencies of an area including the possible tumor using the detector; and creating a second localization map of |s11| reflection coefficients of the area including the possible tumor using the detector.

Abstract: A system for noninvasive monitoring of water content comprising a radio-frequency (RF) planar resonant loop sensor comprising a planar loop antenna; and an element disposed within and co-planar with a loop formed by the planar loop antenna; and a vector network analyzer configured to be connected with the RF planar resonant loop sensor.

Abstract: A planar inductive resonant coupler comprising a circular planar loop antenna; and an element disposed within and co-planar with a loop formed by the antenna; wherein one or more antenna or element dimensions are sized to tune a coupler resonance of the coupler. A method of locating a subcutaneous planar inductive resonant coupler including: providing the subcutaneous planar inductive resonant coupler; providing a locating device configured to couple with the subcutaneous planar inductive resonant coupler; placing the locating device within a coupling range of the subcutaneous planar inductive resonant coupler; plotting a location for each of one or more resonant frequencies of the locating device with respect to a surface under which the subcutaneous planar inductive resonant coupler is expected to be located; and identifying a location for a specific resonant frequency of the subcutaneous planar inductive resonant coupler on the surface.