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IR Frequency Region: Fingerprint Region01:03

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
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MIMO Radio Frequency Identification: A Brief Survey.

Majid Alotaibi1, Mohsin Murad1, Shakir A H Alhuthali2

  • 1Department of Computer Engineering, Umm Al-Qura University, Makkah 21955, Saudi Arabia.

Sensors (Basel, Switzerland)
|June 10, 2022
PubMed
Summary
This summary is machine-generated.

Multi-input multi-output (MIMO) radio frequency identification (RFID) systems enhance anti-collision, range, and bit error rate (BER). These advancements in MIMO RFID technology enable reliable large-scale tag reading and accurate tracking applications.

Keywords:
anti-collisionestimationmimomultiple antennapassiverfidsurvey

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Area of Science:

  • Electrical Engineering
  • Computer Engineering
  • Wireless Communication

Background:

  • Radio Frequency Identification (RFID) systems are crucial for inventory management and tracking.
  • Traditional RFID systems face challenges in large-scale deployments, including tag collision and limited read range.
  • Multi-input Multi-output (MIMO) technology offers potential solutions to these limitations.

Purpose of the Study:

  • To survey the state-of-the-art in MIMO RFID systems.
  • To detail advancements in anti-collision, range extension, bit error rate (BER) improvement, and security.
  • To explore the application of MIMO in passive ultra-high frequency (UHF) RFID.

Main Methods:

  • Review of recent research on MIMO implementations for RFID receivers.
  • Analysis of MIMO's impact on the backscatter channel.
  • Consideration of various passive UHF RFID configurations with multiple antennas.

Main Results:

  • MIMO significantly improves BER and extends read range in RFID systems.
  • Enhanced reliability and throughput are achieved, enabling applications like bulk tag reading and precise tracking.
  • Tag quantity estimation in bulk reading environments presents challenges for MIMO systems.

Conclusions:

  • MIMO technology offers substantial benefits for RFID systems, particularly in improving performance metrics.
  • Key challenges include optimizing tag quantity estimation and maintaining simple, low-cost tag designs.
  • Further research into MIMO RFID protocols and algorithms is essential for broader adoption.