Dielectric Extension for Microwave Antenna Reflection Reduction
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Solution Overview
Problem
Microwave-based investigation methods face challenges with material transitions causing reflections and poor antenna positioning accuracy, especially in applications like breast cancer detection, where direct contact with the object leads to coupling and reduced accuracy.
Innovation Solution
A measuring device with a microwave transmitter, receiver, and control device, featuring an antenna arrangement affixed to the object via gluing or clamping, and an optional dielectric extension to maintain remote-field conditions, reducing reflections and achieving high accuracy by controlling the microwave signals and using multiple antenna arrangements for enhanced resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antennas are distanced by a large air gap from the object to achieve remote-field conditions, then the influence of the object on the antennas is avoided, but material transitions cause reflections that interfere with the investigation
Solution Approach 1:
A dielectric extension is introduced as an intermediary element between the antenna and the object under investigation. This dielectric extension has a higher dielectric constant than air, which allows it to serve as a transition medium that reduces reflections at the air-dielectric interface while maintaining the remote-field conditions. The dielectric extension effectively mediates between the antenna and the object, eliminating the harmful reflections that would otherwise occur at the air-object material transition.
2Object-generated harmful factors
If antennas are disposed directly on the object to eliminate air gap, then coupling between object and antenna occurs, but this eliminates reflections from material transitions
Solution Approach 1:
The dielectric extension acts as a mediator that allows the antenna to be positioned close to or directly on the object while preventing harmful coupling. By having a higher dielectric constant than air, the dielectric extension creates a controlled electromagnetic environment that maintains remote-field conditions even when the antenna is in direct contact with the object, thus eliminating reflections while preventing unwanted coupling.
Solution Approach 2:
The dielectric constant parameter is changed from air (ε₀) to a higher value dielectric material. This parameter change fundamentally alters the electromagnetic field distribution and impedance matching between the antenna and the object, allowing direct contact without coupling while maintaining remote-field conditions. The changed dielectric parameter enables the system to simultaneously achieve both elimination of reflections and prevention of coupling.
3Measurement precision
If multiple antenna arrangements are used for enhanced resolution, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The dielectric extension serves multiple functions simultaneously: it eliminates reflections at material transitions, maintains remote-field conditions, enables direct antenna placement on the object, and supports the use of multiple antenna arrangements for enhanced imaging resolution. This multi-functional element allows the system to achieve high measurement precision with multiple antennas while managing device complexity through a single versatile component.
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 solution enables high-quality, low-cost microwave-based investigations with improved accuracy and reduced interference, allowing for precise detection of breast cancer and other applications by maintaining remote-field conditions and utilizing multiple antenna positions for high-sensitivity resolution.
Implementation Method 1
a dielectric extension (12) is disposed between the antenna (6) and the object (11) to be examined
Implementation Method 2
The microwave transmitter (2) transmits a microwave signal into the object (11) to be examined by the antenna (6) and the dielectric extension (12)
Implementation Method 3
The microwave transmitter (2) transmits a microwave signal into the object (11) to be examined by the antenna (6)
Implementation Method 4
The microwave receiver (3) receives the scattered signal by the further antenna arrangement (71)
Data Source
AI summary
A measuring device comprising a microwave transmitter, a microwave receiver, at least one antenna, and a control device. The control device controls the microwave transmitter and the microwave receiver.