Monopole antenna

摘要

The ground conductor (11), the side conductor (14), and the ceiling conductor (15) surround the antenna element (13), which is connected to the coaxial power supply part arranged on the surface of the ground conductor (11). The ceiling conductor (15)is arranged to face the ground conductor (11) with the antenna element (13) therebetween. The ceiling conductor (15) is provided with an opening (16, 17) whose size, shape, and position are changed to vary the directivity of radio waves. <IMAGE> <IMAGE>