High-coupling-efficiency microstrip antenna based on NV color center and quantum measurement device

By designing a nested rectangular ring-shaped radiating patch structure and precisely matching the resonant frequency, the problem of electromagnetic field mismatch between existing microstrip antennas and NV color centers was solved, achieving high coupling efficiency and low loss NV color center measurement, and improving the stability and sensitivity of the quantum measurement system.

CN122136616APending Publication Date: 2026-06-02STATE GRID BEIJING ELECTRIC POWER CO +1
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Patent Information

Application Number
CN202610308977.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-13
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing microstrip antennas used for NV color center measurement have insufficient matching degree between electromagnetic field distribution and NV color center response characteristics, resulting in low microwave energy utilization, low coupling efficiency, increased loss during signal transmission, and incompatibility between frequency band response characteristics and NV color center quantum characteristics, affecting the stability and sensitivity of the measurement system.

Method used

A high-coupling-efficiency microstrip antenna based on the NV color center is designed. It adopts a nested rectangular ring radiating patch structure with a gap between the inner and outer radiating patches. The NV color center is fixed in the inner electromagnetic near-field enhancement region. By precisely matching the resonant frequency with the spin resonant frequency of the NV color center, combined with the FR-4 dielectric substrate and oxygen-free copper ground plane, the electromagnetic field distribution and impedance matching are optimized.

Benefits of technology

This achieves efficient coupling between the antenna and the NV color center, reduces signal reflection and transmission loss, improves the stability and sensitivity of the quantum measurement system, and enhances the effective transfer efficiency of microwave energy to the NV color center.

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Abstract

The invention provides a high-coupling-efficiency microstrip antenna based on an NV color center and a quantum measurement device. Belongs to the technical field of NV color centers. The microstrip antenna comprises a dielectric substrate, a grounding plane arranged on a first surface of the dielectric substrate, a radiation patch arranged on a second surface of the dielectric substrate, a feed structure and an NV color center diamond, wherein the radiation patch comprises an outer-layer radiation patch and an inner-layer radiation patch which are arranged in a nested manner, the outer-layer radiation patch is encircled to form an outer-layer area, the inner-layer radiation patch is located in the outer-layer area, and a gap is formed between the inner-layer radiation patch and the outer-layer radiation patch; an inner layer area is defined by the inner layer radiation patch, the NV color center diamond is fixed to the second surface of the dielectric substrate and located in the inner layer area, and one end of the feed structure is connected with the outer layer radiation patch. The microstrip antenna realizes accurate matching with NV color center resonance frequency, improves electromagnetic field coupling efficiency, reduces signal reflection and transmission loss, and improves stability and sensitivity of a quantum measurement system.
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