Hard Base Antenna for Bluetooth Temperature Probe
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Solution Overview
Problem
Existing Bluetooth temperature probes with FPC antennas experience performance degradation and shortened service life due to exposure to high temperatures, affecting their ability to maintain stable signal transmission and reception.
Innovation Solution
The use of a hard base antenna with a high frequency insulation substrate, such as epoxy resin or fluorine-based resin, and a metal antenna layer on a copper or aluminum substrate, which is designed to maintain stability and extend service life by minimizing deformation and interference, along with a shielding tube to adjust antenna performance and improve consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If FPC antenna is used in Bluetooth temperature probe, then the device can be manufactured with flexible structure, but the antenna performance degrades and service life shortens under long-term high temperature exposure
Solution Approach 1:
The patent changes the material parameters of the antenna substrate from flexible FPC to hard base materials (PCB, ceramic, metal) with stable thermal properties. This parameter change transforms the antenna from being flexible but temperature-sensitive to being rigid and thermally stable, resolving the contradiction between manufacturability and long-term reliability in high temperature environments.
Solution Approach 2:
The patent employs composite material structures combining hard substrates (PCB, ceramic, or metal) with conductive antenna elements. This composite approach provides both structural stability for high temperature resistance and electrical conductivity for antenna function, eliminating the degradation issues of FPC while maintaining manufacturability.
2Ease of manufacture
If FPC antenna is used, then the structure can be flexible and easy to install, but the service life is shortened due to high temperature degradation
Solution Approach 1:
The patent changes the thermal stability parameter of the antenna substrate by switching from FPC to hard base materials that maintain their physical and electrical properties at high temperatures. This parameter change directly extends service life by preventing the temperature-induced degradation that occurs with FPC antennas.
3Reliability
If hard base antenna is used, then the antenna performance is stable and service life is extended, but the structure becomes more rigid and complex
Solution Approach 1:
The hard base substrate serves multiple functions simultaneously: it provides structural support for the antenna, acts as a thermal barrier protecting the antenna from high temperatures, and serves as the mounting surface for electronic components. This multi-functionality reduces overall device complexity despite the harder material choice.
Solution Approach 2:
The patent merges the antenna substrate with the housing structure or PCB, eliminating the need for separate flexible FPC components. This integration simplifies the overall structure by combining multiple functions into a single rigid component, reducing assembly complexity while maintaining antenna performance stability.
4Reliability
If the antenna metal layer extends into the handle, then signal transmission is maintained, but the handle material with poor shielding effect may interfere with signal
Solution Approach 1:
The patent introduces a shielding layer or shielding structure as an intermediary between the antenna metal layer and the handle. This intermediary component blocks electromagnetic interference from the handle material while allowing the antenna to function properly, resolving the conflict between signal transmission and shielding requirements.
Data Source
AI summary
Disclosed is a Bluetooth temperature probe, including a needle tube, a handle, a first temperature sensor, a PCB and an antenna; the handle is fixedly connected to the needle tube, an accommodating cavity is defined in the handle and the needle tube, respectively, the first temperature sensor, the PCB and the antenna are provided in the accommodating cavity, both of the first temperature sensor and the antenna are electrically connected to the PCB, the antenna is a hard base antenna, which includes a hard substrate and an antenna metal layer provided on the hard substrate, and a rear end of the antenna metal layer extends into the handle.