High-Permittivity Rod Sensor for Selective Microwave Field Detection
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Solution Overview
Problem
Existing electromagnetic field sensing devices are sensitive to both axial and circumferential electric nearfields, particularly at frequencies above 2 GHz, and are complex and expensive to manufacture, failing to selectively detect dielectric irregularities within objects.
Innovation Solution
A receiving device utilizing a rod-shaped sensor with high permittivity, operating in the TM00 mode, filters out surface-parallel E fields and enhances sensitivity to surface-perpendicular E fields by employing a coaxial line with high impedance, allowing direct rectification and wireless transmission of the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a resonant circular TM01p type mode is used in a high-permittivity partially metallized ceramic body, then the device can sense axial electric nearfield, but it also senses circular TM11 type nearfields and has complex design
Solution Approach 1:
The invention extracts only the desired TM01 mode by using a rod-shaped sensor that selectively responds to axial electric nearfield while filtering out circular TM11 type nearfields. The rod geometry and resonant design enable selective detection of the axial component, eliminating the need for complex ceramic bodies with metallized surfaces.
Solution Approach 2:
The invention changes the geometric parameters from a complex ceramic body with metallized surfaces to a simple rod shape with specific dimensions. By adjusting the rod length, diameter, and permittivity, the device achieves selective sensing of axial electric nearfield while simplifying the overall design and manufacturing process.
2Productivity
If the device is designed for operating frequencies in the region 2 to 4 GHz, then it can detect dielectric irregularities, but it becomes sensitive to circular TM11 type nearfields
Solution Approach 1:
The invention adjusts the operating frequency parameter to optimize the balance between detection capability and selectivity. By carefully selecting the rod dimensions and permittivity, the device achieves effective detection of dielectric irregularities while maintaining insensitivity to circular TM11 type nearfields even at higher frequencies.
3Measurement precision
If a short axial air distance is used between the receiving part and the surface of the OUS, then there will be amplification of the electric field component, but the energy content will be much smaller than when in direct contact
Solution Approach 1:
The invention optimizes the permittivity parameter of the rod sensor to achieve the desired balance between field amplification and energy content. By selecting appropriate permittivity values, the device can effectively detect dielectric irregularities while maintaining sufficient signal energy for reliable measurement.
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
The device effectively amplifies and selectively detects dielectric irregularities by enhancing the sensitivity to surface-perpendicular E fields, reducing complexity and manufacturing costs while maintaining stability under varying object permittivities.
Implementation Method 1
A receiving device utilizing a rod-shaped sensor with high permittivity, operating in the TM00 mode, filters out surface-parallel E fields and enhances sensitivity to surface-perpendicular E fields
Implementation Method 2
If a short axial air distance is used between this receiving part and the surface of the OUS, there will be an amplification of this electric field component, due to the displacement (D) vector continuity in this case
Implementation Method 3
allowing direct rectification and wireless transmission of the signal
Data Source
AI summary
An electromagnetic receiving device configured to discriminately react predominantly to an external electric field directed along an axis of said device, comprising a high-permittivity dielectric rod as receiving element, wherein said dielectric rod is oriented along said axis and has a receiving end to be directed towards an object under study, and wherein the device is configured to be essentially resonant with a circularly cylindrical TM00 mode.