Pressure sensing label integrated with antenna structure for insole and implementation method thereof

By designing an integrated structure within the insole, combining a PIFA antenna with a low-dielectric foam insulation layer, the problems of large size, poor comfort, and short lifespan of UHF passive RFID tags within the insole are solved. This achieves stable power supply and efficient pressure acquisition under high bending and sweaty conditions, meeting the accuracy requirements for assessing plantar pressure distribution.

CN122409024APending Publication Date: 2026-07-17HUANGHE S & T COLLEGE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUANGHE S & T COLLEGE
Filing Date
2026-04-20
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing technologies, the application of UHF passive RFID sensor tags in insoles suffers from problems such as large size, poor comfort, short lifespan, and poor stability. In particular, it is difficult to stably supply power and collect foot pressure signals in environments with high bending and sweat.

Method used

It adopts an integrated structure, including a foot contact layer, a thin film FSR, an elastic support layer, a foam isolation layer, a flexible inverted F antenna, a rigid-flex hybrid electronic island, and a protective layer. Through a matching network and a rectifier energy storage module, it achieves low-noise, adjustable-range pressure acquisition and stable readback. The combination of a PIFA antenna and a low-dielectric foam isolation layer improves antenna efficiency and stability.

Benefits of technology

Ensuring the reliability of RF ICs and matching, rectification, energy storage, and sensing interfaces in high-bending and sweaty environments, improving antenna efficiency, extending service life, meeting the accuracy requirements for plantar pressure distribution assessment, and offering low cost and suitability for mass production.

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Abstract

The application discloses a pressure sensing label and antenna integrated structure for insoles and an implementation method thereof, and relates to the fields of radio frequency identification and wearable sensing technology.The structure comprises a flexible inverted F (PIFA) antenna and a ground back with a plane size of not more than about 50*50 mm, a low dielectric foam isolation layer with a thickness of 2-5 mm, a rigid-flex electronic island, a Pi type matching network, a thin film FSR voltage division network and a protection structure.The application solves the problems of large antenna frequency shift and low efficiency under near human body loading through the collaborative design of the PIFA antenna, the foam isolation and the high coverage ground back;the reliability under long-term stepping and sweat environment is improved by adopting the rigid-flex electronic island to isolate the sensitive device, cooperating with stress release and three-proof design;the passive scheme can realize 50-100 Hz level plantar pressure sampling and stable read-back under the conditions of a reader EIRP of 10-20 dBm and a distance of less than 15 cm, and is suitable for gait monitoring, powered exoskeleton control and other scenes.
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