Temperature Probe Antenna Impedance Matching via Loading Coil
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Solution Overview
Problem
Existing temperature measuring probes with shortened monopole antennas face challenges in impedance matching with resonator temperature sensors, leading to inefficient power transfer due to low impedance, which limits their compactness and effectiveness.
Innovation Solution
The temperature measuring probe achieves improved impedance matching by matching the material and dimensions of the electrically insulating section with the antenna, creating a controlled top load capacitance between the antenna tip and the conductive section, using a coaxial line for electrical connection, and optionally evacuating or filling the antenna cavity with inert gas for thermal isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna is configured as a shortened monopole to reduce size, then the probe becomes more compact, but the impedance matching between the antenna and resonator deteriorates due to very low impedance
Solution Approach 1:
A loading coil is introduced as an intermediary component between the shortened monopole antenna and the resonator. The loading coil provides inductive reactance that compensates for the low impedance of the shortened antenna, enabling proper impedance matching and power transfer without increasing the overall probe length
Solution Approach 2:
The impedance matching is achieved by changing the electrical parameters of the antenna system through the loading coil, which modifies the reactance and resistance characteristics. This allows the shortened monopole to present an appropriate impedance level for effective coupling with the resonator, resolving the contradiction between compactness and impedance matching
2Volume of moving object
If the antenna impedance is reduced to improve compactness, then the probe size decreases, but power transfer from and to the resonator is limited
Solution Approach 1:
The loading coil serves as a mediator that enables efficient power transfer between the resonator and the shortened monopole antenna. By providing the necessary inductive reactance, it allows the low-impedance antenna to receive and transmit power effectively without energy loss, maintaining both compactness and power transfer efficiency
Solution Approach 2:
The patent replaces the need for a longer mechanical antenna structure with an electrical solution using the loading coil. Instead of extending the physical antenna length to improve impedance, the system uses electromagnetic reactance compensation through the coil, achieving the same goal with a more compact design
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for a compact, space-efficient design with reliable impedance matching, enhancing the probe's ability to operate effectively across a wide range of temperatures and applications without the need for additional components, ensuring consistent performance and thermal stability.
Implementation Method 1
creating a controlled top load capacitance between the antenna tip and the conductive section
Implementation Method 2
A temperature sensor including a resonator is disposed in the electrically conductive section
Data Source
AI summary
A temperature measuring probe with a hollow outer shell including an electrically conductive section and an electrically insulating section. A temperature sensor including a resonator is disposed in the electrically conductive section and electrically conductively connected to the electrically conductive section. An antenna including a shortened monopole is disposed in the electrically insulating section. The temperature sensor and the antenna are electrically conductively connected to each other. A respective material and respective dimension of the electrically insulating section and the antenna are matched such that an effective resistance of the antenna is approximately equal to an effective resistance of the temperature sensor in an operating frequency range of the temperature sensor.