Diversity antenna device for mounting on travelling object

Abstract

Abstract PURPOSE:To realize an antenna device of directivity switching system having a small occupied area and a high efficiency, by installing two pieces of antenna elements provided obliquely onto the metal car body plus the reflector onto the face which divides the antenna elements into two parts. CONSTITUTION:Two pieces of antenna element 2 and 3 are installed obliquely onto the roof 1a of the metal car body 1, and the reflector 4 is provided to the face which divides the elements antenna each with the body 1 and then led to the diversity antenna switching device by the feeder. In this case, the element 4 functions as a reflector to the elements 2 and 3, respectively. The directivity within horizontal face of the elements 2 and 3 becomes the single-direction directivity opposite to each other. Accordingly, an antenna device of directivity switching system can be obtained easily by using the elements 2 and 3 in switching. Furthermore, the occupied area can be reduced with a simplified structure for attachment.

Inventors

• 👤 Yumio Kawai

Bibliographic Details