5 results about "Symmetric systems" patented technology

This invention discloses a monostatic symmetric nested array MIMO system and a near-field positioning method, belonging to the field of monostatic MIMO near-field positioning technology. This invention can effectively improve the positioning performance during near-field estimation. The monostatic symmetric nested array MIMO system proposed in this invention has a symmetrically distributed transmit and receive arrays. Compared to other symmetric MIMO systems, its differential array is a positionally continuous array with more degrees of freedom. With the same physical array aperture, fewer physical array elements are actually used, reducing costs. The near-field positioning method proposed in this invention calculates the fourth-order statistics of the signal and quantizes them to obtain a virtual differential array of the differential array, achieving accurate near-field positioning of sparse MIMO structure arrays. Furthermore, it can be extended to more sparse MIMO symmetric systems.

The invention, which relates to the technical field of wireless sensing, discloses a reader-integrated third-order space-time-symmetric wireless sensing system comprising a reader and a sensor which are in inductive coupling connection. The reader comprises a gain LC resonance unit and a relay LC resonance unit, and the gain LC resonance unit and the relay LC resonance unit are connected through a capacitance coupling assembly. The sensor is a loss LC resonance unit. According to the invention, the gain LC resonance unit and the relay LC resonance unit of the three-order PT symmetric system use capacitance coupling to replace the original inductance coupling mode. According to the coupling mode, the integration level of the reader can be further improved, and meanwhile the coupling coefficient of the reading end can be adjusted more conveniently and rapidly.

The invention discloses a wireless sensing system and a sensing method for realizing APT symmetry based on unidirectional coupling. The wireless sensing system comprises four resonators, a reading end follower and a sensing end follower, by adding a reading end follower and a sensing end follower in a wireless sensing system, imaginary number coupling between resonators in a traditional APT symmetric system is replaced by real number coupling, so that wireless connection between different resonators in the APT symmetric system is realized. Meanwhile, when the system works around an EP point, the number of working frequencies of the system is remarkably changed, so that the two working frequencies of the wireless sensing system can be located at the overlapped and bifurcated junction by adjusting the coupling rate of the reading end follower and the sensing end follower, calibration of the EP point is completed, and the wireless sensing system works in a high-sensitivity state.

The present invention provides a multi-load wireless power transfer system based on high-order Anti-PT symmetry. By introducing a “W-shaped” anti-resonance mode into a basic WPT platform, an effective Anti-PT non-Hermitian system is conveniently constructed. The “level attraction” of the anti-resonance mode is combined with the “level splitting” of the anti-resonance mode and the resonance mode, to study the “level pinning” effect of high-order Anti-PT symmetry. Compared with the traditional resonant WPT, the anti-resonant WPT has higher security, stability, transfer efficiency, and flexibility. Considering the miniaturization and integration of devices, a “meta coil” is designed by using a “synthetic dimension”, and used to construct a high-order Anti-PT symmetric system, thereby achieving multi-load efficient WPT. The new WPT technology based on the “level pinning” effect of high-order Anti-PT symmetry provides a good application research platform for enriching non-Hermitian physics.

The application provides a PT symmetric system based on a negative impedance transformer and an energy efficiency and distance improvement method thereof, and is characterized in that: at least one negative impedance transformer is connected in series on a wireless power transmission loop, the negative impedance transformer is constructed based on a transformer and an operational amplifier, wherein: the transformer considers leakage inductance and magnetizing inductance, a primary winding of the transformer is connected in series in the transmission loop, one end of a secondary winding of the transformer is grounded, and the other end is connected to an inverting input terminal of the operational amplifier, and the operational amplifier is equivalent to a negative resistance module or a negative inductance module by configuring a resistance element or / and an inductance element on a corresponding branch. The effect is that: the flexible adjustment of the inductance ratio is realized by constructing a negative inductance on the primary side, the power extreme point is accurately approached, and the output current is optimized in combination with the primary side compensation negative resistance, so that the problem of small power is solved from the core parameter level.