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# Loop Antenna

## by Yong Heui Cho, Associate Professor at Mokwon University on Feb 12, 2012

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A loop antenna has simple structure but its analysis is not easy to perform. Since a loop antenna is a dual pair of a dipole antenna, we can adopt the analysis of a dipole for a loop based on the ...

A loop antenna has simple structure but its analysis is not easy to perform. Since a loop antenna is a dual pair of a dipole antenna, we can adopt the analysis of a dipole for a loop based on the duality theorem. By stacking a number of loops, we can increase the antenna gain and radiation resistance very easily.

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## Loop AntennaPresentation Transcript

• Antenna Engineering CHO, Yong Heui Loop Antenna
• Small loop antenna 1. Loop antenna
• Duality theorem
• Electric dipole antenna
 
• Magnetic dipole moment 1. Loop antenna
• Electric dipole moment vs. magnetic dipole moment
 
• Near field components 1. Loop antenna
• Constant current
• Duality theorem:
• Far field components 1. Loop antenna
• Observation point: infinity
• Radiation power and resistance 1. Loop antenna
• Effective antenna: # of turns
  Single turn Multiple turns
• Loop-stick antenna 1. Loop antenna
• Ferrite core and multiple turns
• 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
• Crystal loop antenna 1. Loop antenna
• Efficient antenna: multiple turns
• Direction of current, feeding point
• Circular loop antenna 1. Loop antenna
• Gamma matching: variation of T-matching
• Tuning: capacitor, resonant frequency
 Gamma matching part Tuning part
• Gamma matching 1. Loop antenna
• Folded dipole antenna
• Capacitor needed
• Tuning: capacitor 1. Loop antenna 