Electromagnetic field analysis and measurement of a motorcycle equipped with a whip antenna at 145 MHz band

Abstract

When we drive a car, we are electrostatically shielded by the car. On the other hand, when we ride a motorcycle, we are not shielded and can affect the antenna characteristics of the antenna mounted on the motorcycle. Therefore, the interaction between the antenna and the human body must be considered. When the human body is near the antenna, the circuit characteristics of the antenna change and impedance mismatch occurs. There are many research reports on the characteristics of a car equipped with antennas, but there are few reports for a motorcycle. Simulations were done on a human body riding a motorcycle equipped with a whip antenna. The radiation characteristics of electromagnetic field, reflection coefficient, impedance at 145 MHz band were simulated using XFdtd software. These values were compared with measurement.