Loop Antenna
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The document discusses various aspects of loop antennas, including their duality theorem, electric and magnetic dipole moments, and radiation characteristics. It covers different designs such as single turn, multiple turns, square loop, and crystal loop antennas, along with their efficiencies and gain. Additionally, it addresses matching techniques and the differences in current distribution among loop antennas.
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Loop Antenna
- 1. Antenna Engineering CHO, Yong Heui Loop Antenna
- 2. Small loop antenna 1. Loop antenna Duality theorem Electric dipole antenna
- 3. Magnetic dipole moment 1. Loop antenna Electric dipole moment vs. magnetic dipole moment
- 4. Near field components 1. Loop antenna Constant current Duality theorem:
- 5. Far field components 1. Loop antenna Observation point: infinity
- 6. Radiation power and resistance 1. Loop antenna Effective antenna: # of turns Single turn Multiple turns
- 7. Loop-stick antenna 1. Loop antenna Ferrite core and multiple turns Large radiation resistance AM receiver
- 8. One-wavelength loop antenna 1. Loop antenna Continuous current distribution Not uniform current Compared with standing wave antenna Traveling wave antenna Square loop antenna: gain = 3.09 dB
- 9. Crystal loop antenna 1. Loop antenna Efficient antenna: multiple turns Direction of current, feeding point
- 10. Circular loop antenna 1. Loop antenna Gamma matching: variation of T-matching Tuning: capacitor, resonant frequency Gamma matching part Tuning part
- 11. Gamma matching 1. Loop antenna Folded dipole antenna Capacitor needed
- 12. Tuning: capacitor 1. Loop antenna