Related Experiment Video
Updated: Apr 23, 2026
08:25
Construction of a Wireless-Enabled Endoscopically Implantable Sensor for pH Monitoring with Zero-Bias Schottky Diode-based Receiver
Published on: August 27, 2021
2.0K
Probing a dielectric resonator acting as passive sensor through a wireless microwave link
J-M Friedt1, R Boudot2, G Martin2
1SENSeOR SAS, c/o FEMTO-ST Time and Frequency, Besançon, France.
The Review of Scientific Instruments
|October 3, 2014
Summary
Dielectric resonators can act as passive wireless sensors. Their unique spectral responses, measured by microwave RADAR, enable remote temperature estimation with Kelvin resolution, separating signals from clutter.
Area of Science:
- Electromagnetics
- Microwave Engineering
- Sensor Technology
Background:
- Dielectric resonators are typically used for frequency filtering in oscillator circuits.
- Passive cooperative targets offer advantages in wireless sensing applications.
- Spectral characteristics of materials can be probed using RADAR systems.
Purpose of the Study:
- To demonstrate the use of dielectric resonators as passive cooperative targets for wireless sensing.
- To investigate the spectral characteristics of dielectric resonators using a microwave RADAR system.
- To assess the feasibility of remote temperature estimation using dielectric resonators.
Main Methods:
- Probing spectral characteristics of dielectric resonators with a microwave RADAR system.
- Analyzing the unique spectral response and energy storage capabilities of the resonators.
- Utilizing resonance frequency determination for remote sensing.
Main Results:
- Dielectric resonators exhibit unique spectral responses suitable for wireless sensing.
- The energy storage capability aids in separating sensor signals from background clutter.
- Accurate resonance frequency determination allows for remote temperature estimation.
Conclusions:
- Dielectric resonators can be repurposed as passive wireless sensors.
- Microwave RADAR probing effectively characterizes resonator spectral responses.
- Remote temperature sensing with Kelvin resolution is achievable using this approach.
Related Concept Videos
01:28Standing Waves in a Cavity
1.7K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.7K
01:18Capacitor With A Dielectric
4.2K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
4.2K
01:23Parallel Resonance
847
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
847
01:24Characteristics of Series Resonant Circuit
896
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
896
01:17Series Resonance
1.0K
The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
1.0K