Oblique fed ring antenna mounted in car headlight for automotive applications

摘要

An oblique fed ring antenna designed and fabricated for its use in automotive applications is presented. The ring antenna is mounted on a car headlight at a certain height around the bulb with the help of a nylon supporting post. The reflector of the car headlight polished with conducting paint is made to act as the reflector for the ring antenna. Return loss performances are measured and compared for different heights of the ring antenna as well as for different parts associated with the headlight. Free space radiation pattern measurement of the ring antenna is carried out to have an insight of the effect of the light reflector for both the vertical and horizontal polarisations.