公开(公告)号：US3902177A

公开(公告)日：1975-08-26

申请号：US33841973

申请日：1973-03-06

Applicant: TAIYO MUSEN CO LTD

Inventor： MORI KENZO ,  YASUDA HYO ,  KATSUBE YUJIRO ,  IKEDA NORIO

IPC: G01S3/04 ,  G01S3/38 ,  G01S3/42 ,  H01Q5/00 ,  H01Q7/04 ,  H01Q11/12

CPC classification number: H01Q7/04 ,  H01Q5/378

Abstract: This invention relates to an antenna for direction finders presenting a high sensitivity in a narrow band by making a loop antenna and a shielding tube resonate at any two desired frequencies.