Loop Antennas
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  • 1. Introduction
  • 2. Fundamentals
    • 2.1. Near-Field and Far-Field
    • 2.2. Electromagnetic Spectrum
      • 2.2.1. Radio Spectrum
    • 2.3. Antenna Types
      • 2.3.1. Wire Antennas
      • 2.3.2. Log-Periodic Antennas
      • 2.3.3. Aperture Antennas
      • 2.3.4. Travelling Wave Antennas
      • 2.3.5. Reflector Antennas
      • 2.3.6. Microstrip Antennas
      • 2.3.7. Other Antennas
    • 2.4. Magnetic Testing
    • 2.5. VLF & LF Antenna
    • 2.6. Shielding
      • 2.6.1. Magnetic Shielding
  • 3. Small Loops
    • 3.1. Introduction
    • 3.2. Radiated Fields
      • 3.2.1. Thin Wire, Constant Current, Small Circumference
    • 3.3. Loop Geometry
      • 3.3.1. Dimensions
      • 3.3.2. Coil cross-section advantage/disadvantage
    • 3.4. Impedance of a Small Loops
      • 3.4.1. Over a Conducting Medium
    • 3.5. Receiving Signal
    • 3.6. Signal to Noise Ratio (SNR)
      • 3.6.1. Rx
      • 3.6.2. Transformer coupled
      • 3.6.3. Direct Connected
  • 4. EM Modeling
    • 4.1. Magnetic Dipole Moment
      • 4.1.1. Time-Varying, Cored and N-Turn Loop Antenna
      • 4.1.2. Static, Cored and N-Turn Loop Antenna
      • 4.1.3. Moment of Torquer
    • 4.2. Effective Height (Length)
    • 4.3. Directivity and Efficiency
      • 4.3.1. Omnidirectivity
    • 4.4. Quality Factor
    • 4.5. Losses
    • 4.6. Near field Propagation
      • 4.6.1. Phase Behaviour
      • 4.6.2. Near Field Propagation based on Friis Law
    • 4.7. Antenna Gain
  • 5. Circuit Modeling
    • 5.1. Complete Model
      • 5.1.1. Circuit Model of Solenoid Receiver
    • 5.2. Circuit Model of Loop Antennas
      • 5.2.1. Model 2
      • 5.2.2. Model 3
      • 5.2.3. Model 4 - Air Core Solenoid
      • 5.2.4. Model 5
      • 5.2.5. Model 6 - Receiving Loaded Antenna
    • 5.3. Radiation Resistance
    • 5.4. Coil Resistance
      • 5.4.1. Loaded Loop Resistance
      • 5.4.2. Skin Effect Resistance
      • 5.4.3. Proximity Effect Resistance
      • 5.4.4. Resistance of Inductors
    • 5.5. Coil Inductance
      • 5.5.1. Air Core Loop
      • 5.5.2. Air Core Solenoid
      • 5.5.3. Magnetic Core Loop
      • 5.5.4. Effective Radius of Solenoid
    • 5.6. Coil capacitance
    • 5.7. Impedance Matching
      • 5.7.1. Pick-up Coil
      • 5.7.2. Transformer Coupling
    • 5.8. Self Resonance Frequency
  • 6. Magnetic Core Loops
    • 6.1. Introduction
      • 6.1.1. Dimensions
      • 6.1.2. Measurement
      • 6.1.3. Permeability (Influence of High-Frequency Magnetic Fields)
      • 6.1.4. Two Winding Solenoid
      • 6.1.5. Notes
    • 6.2. History
    • 6.3. Radiated Fields
    • 6.4. Magnetic Cores
      • 6.4.1. Modeling of B-H Curves
      • 6.4.2. Nickel-Iron Soft Magnetic Materials
      • 6.4.3. Magneto-mechanical Effect
      • 6.4.4. Dust Core (Mass Core)
    • 6.5. Demagnetization Factor
      • 6.5.1. Demagnetization Factor from Charts
      • 6.5.2. Demagnetization Factor from Formulas
      • 6.5.3. Demagnetization Factor from Formulas with Inductance
    • 6.6. Induced Voltage and Power
    • 6.7. Core Loss
      • 6.7.1. Spheroidal Core
      • 6.7.2. Cylindrical Core
      • 6.7.3. Core Data
    • 6.8. Radiation Resistance
    • 6.9. Relative Effective Permeability
  • 7. Applications
    • 7.1. Biomedical Implant
    • 7.2. Magnetometer
      • 7.2.1. Magnetotelluric
    • 7.3. Marker Beacon
    • 7.4. Radio Direction Finder
    • 7.5. Radio Receiver Antenna
    • 7.6. Real-time Locating System
    • 7.7. RFID
    • 7.8. Underwater Loop Antenna
    • 7.9. Wireless Power Transfer

Special Chapters

  • Eddy Currents
    • Multifield Eddy Current Effect
  • Electric Dipole Antennas
    • Circuit Model of Dipole Antenna
  • Fundamental Limit
  • Lossy Medium
    • Power Loss
  • Magnetically Shielded Wire
  • Mutual Inductance

Appendices

  • Nomenclature
    • Derivations from other quantities
  • Abbreviations
  • References
  • Fingerprints of Papers
  • Dictionary
    • Aperture (of an antenna)
    • Balanced Line
    • Balun
    • Chu Limit
    • Coupling Coefficient
    • Like and Unlike Antennas
    • Magnetic susceptibility
    • Modal Analysis
    • Orthogonal Signals
    • Torquer
    • Unbalanced Line
  • Useful Links
  • Journals
Loop Antennas
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  • Useful Links
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Useful LinksΒΆ

  • Magnetic Field Shielding - https://www.lessemf.com/mag-shld.html
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© Copyright 2018, Ceyhun Sezenoglu Revision aa2fef72.

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