A quadruple-gap loop antenna for low frequency radiated emission measurements

This paper discusses the detailed design and optimization of a four-quadrant loop antenna with interchangeable feed. This antenna is designed to minimize electric field sensitivity while maintaining superior magnetic field response in both the transmitting and receiving modes. Direct tradeoffs between magnetic and electric field sensitivity, field uniformity, antenna dimension, feed design, and operational bandwidth are discussed. Finally, the antenna factor of the quadruple-gap loop antenna is directly compared with theoretical formulations. The discussions put forth are directly applicable when considering loop antennas in low frequency radiated emission testing.