Title:
【発明の名称】アンテナ装置
Document Type and Number:
Japanese Patent JP3384353
Kind Code:
B2
Abstract:
A dielectric refractor, a refractive index of which varies in accordance with a frequency, is situated between a primary horn serving as a electric wave source and a concave sub-reflector. A desired transmitting wave in the desired transmitting frequency band is refracted by the dielectric refractor so as to illuminate the sub-reflector. An undesired transmitting wave outside the desired transmitting frequency band is refracted by the dielectric refractor so as to pass along a path for the undesired wave, and reaches a electric wave-absorber to be absorbed thereby. Accordingly, the undesired transmitting wave does not reach the sub-reflector, and is prevented from being radiated to the outside of the antenna apparatus via the sub-reflector and the main reflector.
Inventors:
Yutaka Yamaguchi
Application Number:
JP7902699A
Publication Date:
March 10, 2003
Filing Date:
March 24, 1999
Export Citation:
Assignee:
NEC
International Classes:
H01Q15/00; H01Q15/23; H01Q17/00; H01Q19/19; (IPC1-7): H01Q19/19; H01Q15/23; H01Q17/00
Domestic Patent References:
| JP63139403A | ||||
| JP623510A | ||||
| JP4352504A | ||||
| JP983245A | ||||
| JP130307A | ||||
| JP11220323A | ||||
| JP4114211U | ||||
| JP366213U | ||||
| JP6341911U | ||||
| JP5669109U |
Attorney, Agent or Firm:
Tadao Hirata