Provided is a medical device assembly for detection of medical device components and/or mating thereof. The medical device assembly may include a first medical device component having at least one first resonant structure, which may have a first resonant frequency spectrum. A second medical device component may have at least one second resonant structure, which may have a second resonant frequency spectrum different than the first resonant frequency spectrum. Upon mating of the first medical device component to the second medical device component, the first resonant structure(s) and the second resonant structure(s) may combine to have a third resonant frequency spectrum, which may be different than the first resonant frequency spectrum and the second resonant frequency spectrum. A system and method are also disclosed.

Subharmonic tags for passive far-field sensing are provided having at least one antenna configured to receive an interrogation signal having a plurality of interrogation frequencies, a passive LTI network in electrical communication with the at least one antenna, and two or more resonators, each resonator having a different resonant frequency and a corresponding trigger frequency different than the resonant frequency, wherein the passive LTI network is configured such that the tag only produces a response signal for trigger frequencies that are different from any of the resonant frequencies of the resonators, each resonator of the subharmonic tag configured to produce a response signal having a different frequency than the trigger frequency, the subharmonic tag configured to produce an output signal responding to the interrogation signal, the output signal including one or more of the response signals.

The harmonic tag includes a ring resonator circuit and may include a first ring microstrip disposed on a first side of a first dielectric substrate, a microstrip feedline spaced apart from and adjacent to the first ring microstrip and a ground plane disposed opposite the first ring microstrip and the microstrip feedline on a second side of the first dielectric substrate. The ring resonator circuit is tuned to resonate at an interrogation frequency. A dipole antenna circuit may include a dipole microstrip electrically coupled to the microstrip feedline through a first diode. The first diode causes the dipole microstrip to transmit a harmonic signal having a harmonic frequency twice the interrogation frequency.

According to embodiments of the present invention, a device releasably couplable to an electric asset is provided. The device includes a sensor configured to detect partial discharge from the electric asset and generate a pulsed signal representative of a presence or absence of the detected partial discharge; and a time-domain based RFID tag electrically coupled to the sensor. The time domain-based RFID tag is configured to provide an ID code uniquely representative of a location of the device when coupled to the electric asset. The device is configured to generate, upon interrogation by an external interrogator, a backscattered signal including the ID code and the pulsed signal. The generated backscattered signal is to be read by an external reader. According to further embodiments, a method for obtaining identification of at least one electric asset and information on partial discharge experienced by the at least one electric asset is also provided.

An authentication apparatus is provided. The authentication apparatus has a dielectric carrier and a plurality of millimeter wave resonance structures on or in the dielectric carrier, wherein at least one first millimeter wave resonance structure of the millimeter wave resonance structures has a first resonant frequency, which has a first resonance strength when irradiated at the first resonant frequency, and wherein at least one second millimeter wave resonance structure of the millimeter wave resonance structures has a second resonant frequency, which has a second resonance strength, which is equal to the first resonance strength or is different from it, when irradiated at the second resonant frequency.