Circularly polarized antenna and radar device using the same

Details Circularly polarized antenna and radar device using the same Circularly polarized antenna and radar device using the same

2005-11-14

2009-12-29

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S895000

Reexamination Certificate

active

07639183

ABSTRACT:
A circularly polarized antenna has a dielectric substrate, a ground conductor piled up on one surface side of the dielectric substrate, a circularly polarized antenna element formed on an opposite surface of the dielectric substrate, a plurality of metal posts whose respective one end sides are connected to the ground conductor and penetrate the dielectric substrate along a thickness direction thereof, and whose respective other sides extend up to the opposite surface of the dielectric substrate, the plurality of metal posts configuring a cavity by being provided at predetermined intervals so as to surround the antenna element, and a conducting rim which short-circuits the respective other end sides of the plurality of metal posts along an array direction thereof, and is provided so as to extend by a predetermined distance in a direction of the antenna element at the side of the opposite surface of the dielectric substrate.

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