Numerical signal calculation and detection capability of magnetic resonance antenna with high rectangular coefficient

Magnetic resonance technology is widely used for groundwater detection due to its direct and quantitative advantages, typically employing square antennas. However, in narrow environments such as mine roadways, canyons, and dams, rectangular antennas with varying dimensions are more practical than square ones. The existing literature lacks comprehensive discussion about the response characteristics of magnetic resonance signals of rectangular antennas, particularly those with high rectangular coefficients. This paper addresses the challenges encountered in a particular application scenario by computing the magnetic resonance excitation magnetic field generated by a rectangular antenna. In addition, it determines the response characteristics of the magnetic resonance signal of rectangular multi-turn coils. We propose coefficient indices of magnetic resonance antennas with different rectangular coefficients, in conjunction with the receiving antenna's matching system to evaluate the actual detection capabilities of various rectangular antennas. Field testing validates the proposed method's effectiveness, providing a robust foundation for assessing the actual detection capability of magnetic resonance antennas and selecting appropriate antennas for specific scenarios. •Magnetic resonance detection can directly obtain water information.•Rectangular antennas have advantages over traditional round and square antennas in some special situations (tunnels and mines, etc.).•Rectangular antennas help to broaden the application of magnetic resonance detection technology.