| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem that a radar-use antenna device, in which a primary radiator using a coaxial line is fixed to a feed line and a reflection mirror is rotated at the outer circumference of the primary radiator, becomes expensive because the number of components is increased when being made high in gain and that the high output of a radar device is limited because transmission loss is increased in a high frequency by using the coaxial line and power-proof characteristics are more degraded than that in a waveguide path. <P>SOLUTION: A waveguide is used for a feeding path, and an electromagnetic horn is used for a radiating part as a fixed primary radiator 12. A conical reflector is installed at an upper part of the electromagnetic horn, and an antenna forms a horizontally non-directional beams when the conical reflector reflects a beam by the electromagnetic horn. Reflectors (main and sub reflectors) 11a and 11b are rotated at the outer circumference of the primary radiator. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
