Title:
GLASS ANTENNA FOR AUTOMOBILE HIGH FREQUENCY
Document Type and Number:
Japanese Patent JP3541451
Kind Code:
B2
Abstract:
PURPOSE: To provide an antenna which displays the performance approximately equal to the reception sensitivity of a pole antenna by specifying the length of the connection line which connects a loop main antenna, which is provided in the glass plate of a window of an automobile, and a feed part.
CONSTITUTION: A glass plate 9 is provided with a loop main antenna conductor 1, an auxiliary antenna conductor 2, etc., and the main antenna conductor 1 and a feed part 5 are connected by a connection line 4. The length of the connection line 4 is set to ≤λK/2 where λ is the wavelength of a transmission/ reception radio wave and K is the reduction rate of the glass antenna. The reception sensitivity is reduced if the length of the connection line 4 exceeds λK/2. and it is preferable that this length is ≤λK/4. Thus, the same reception characteristic as a pole antenna is obtained.
Inventors:
Koji Tabata
Tsuyoshi Yamamoto
Kenichi Ishii
Tsuyoshi Yamamoto
Kenichi Ishii
Application Number:
JP21917794A
Publication Date:
July 14, 2004
Filing Date:
September 13, 1994
Export Citation:
Assignee:
Asahi Glass Co., Ltd.
International Classes:
H01Q1/32; H01Q1/22; H01Q1/50; H01Q7/00; (IPC1-7): H01Q1/32; H01Q1/22; H01Q1/50
Domestic Patent References:
| JP6204727A | ||||
| JP6232617A | ||||
| JP3283801A |