To provide a helical antenna which uses a supporting member having as less deterioration of antenna characteristic as possible though it is formed of an insulator material with high loss property.
The helical antenna includes: a cylindrical body made of an insulator film 3; helical elements 4a-4d which are formed of a line conductor wound spirally around the cylindrical body; a ground conductor plate 1 which is arranged vertical to the expansion direction of the cylindrical body on one end side of the cylindrical body; a feeding terminal 2 which is provided on the side of the ground conductor plate and is led to each of the helical elements; and a supporting member 11 which is arranged inside the cylindrical body and is made of an insulator. The supporting member 11 has a diameter equal to the inside diameter of the cylindrical body, and it is arranged in contact with the surface of the ground conductor plate and is provided with a disk-like region 11b to be fixed to the ground conductor plate.
OHASHI HIDEMASA
TAKIGAWA MICHIO
| JPH11225015A | 1999-08-17 | |||
| JPH08204434A | 1996-08-09 | |||
| JPS62105606U | 1987-07-06 | |||
| JPH04234207A | 1992-08-21 | |||
| JP2001156528A | 2001-06-08 | |||
| JP2001053531A | 2001-02-23 |
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order
Kazuhiro Oyaku
Shunichi Ueda
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