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The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
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Simple harmonic motion is the name given to oscillatory motion for a system where the net force can be described by Hooke's law. If the net force can be described by Hooke's law and there is no damping (by friction or other non-conservative forces), then a simple harmonic oscillator will oscillate with equal displacement on either side of the equilibrium position. To derive an equation for period and frequency, the equation of motion is used. The period of a simple harmonic oscillator is given...
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To determine the energy of a simple harmonic oscillator, consider all the forms of energy it can have during its simple harmonic motion. According to Hooke's Law, the energy stored during the compression/stretching of a string in a simple harmonic oscillator is potential energy. As the simple harmonic oscillator has no dissipative forces, it also possesses kinetic energy. In the presence of conservative forces, both energies can interconvert during oscillation, but the total energy remains...
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Passive Harmonic RFID System for Buried Assets Localization.

Abanob Abdelnour1, Antonio Lazaro2, Ramón Villarino3

  • 1Laboratoire de Conception et d'Intégration des Systèmes (LCIS), University Grenoble Alpes, Grenoble INP, 26000 Valence, France. abanob-assaad-amin.abdelnour@lcis.grenoble-inp.fr.

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This study introduces a passive harmonic tag for locating buried utilities. The novel tag design enables accurate localization by transmitting a second harmonic signal, improving buried asset detection.

Keywords:
RFIDharmonic radarpassive tagunderground communications

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Area of Science:

  • Electrical Engineering
  • Antenna Theory
  • Signal Processing

Background:

  • Accurate localization of buried utilities is crucial for infrastructure management.
  • Existing methods for buried asset detection face challenges with accuracy and cost.
  • Passive tags offer a low-cost, low-power solution for asset identification.

Purpose of the Study:

  • To present a novel passive harmonic tag for buried utility localization.
  • To design and analyze a dual-polarized patch antenna system for harmonic signal generation and reception.
  • To develop a low-cost reader system for tag interrogation.

Main Methods:

  • Design of a dual-polarized patch antenna operating in the Ultra High Frequency (UHF) band.
  • Integration of a Schottky diode-based frequency doubler to generate a second harmonic signal.
  • Implementation of an RF to DC converter for power harvesting to bias a quartz oscillator.
  • Theoretical estimation of read range based on soil properties (composition and water content).
  • Development of a low-cost Software Defined Radio (SDR) reader.

Main Results:

  • A functional passive harmonic tag prototype was successfully developed.
  • Theoretical read range was estimated considering various soil conditions.
  • Experimental validation of the tag's performance in different soil environments was conducted.
  • The system demonstrated potential for effective buried asset localization.

Conclusions:

  • The proposed passive harmonic tag is a viable solution for buried utility localization.
  • The dual-polarized antenna and harmonic generation approach enhances detection capabilities.
  • The low-cost SDR reader makes the system accessible for widespread adoption.