PURPOSE: To attain the flat mount of an FM reception antenna without being projected from a receiver or a car body, etc., by providing a spiral coil flat plate, a flat conductor plate and an intermediate tap orthogonal to the shaft of a spiral coil.
CONSTITUTION: The spiral coil 10 is made flat, a conductor 20 is opposite to the spiral coil 10 via air 30 being one of an insulator, connected to one end 11 of the spiral coil 10 and made orthogonal to the shaft of the spiral coil 10. Moreover, the intermediate tap 13 is a tap on the spiral coil 10 and connected to a feeder 40. The position of the intermediate tap 13 is a position where the impedance at the antenna side (conductor 20 side) and the impedance of the feeder 40 are made equal. Thus, the antenna is mounted flat without being projected from the receiver or the car body, etc.
JPS5664503A | 1981-06-01 | |||
JP59127315B | ||||
JP58093007B | ||||
JPS6147504B2 | 1986-10-20 | |||
JP60072010B | ||||
JPS61196603A | 1986-08-30 | |||
JPS5299754A | 1977-08-22 | |||
JP54022436B | ||||
JPS58198902A | 1983-11-19 | |||
JPS61247115A | 1986-11-04 |
Next Patent: FREQUENCY SEPARATION CIRCUIT