A simplified model for designing whip antenna mounted on a motorcycle

When we drive a car, the external antenna is electrostatically shielded by the car's body from the passengers. No such shield exists when we ride a motorcycle, and so the rider can affect the characteristics of the antenna mounted on the motorcycle. Therefore, the interaction between the antenna and the human body must be considered. This paper proposes a simple model to analyze the influence of the rider's body on the motorcycle's antenna. The radiation characteristics in the 145 MHz band and the impact of mounting position on the reflection coefficient are simulated using XFdtd software. The resulting values are compared with measured values.