EP0506334A1
Expired / Lapsed
EP
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Window glass antenna for automobile
Assignee: Nippon Sheet Glass Co Ltd
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Filing: 1992-03-24
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Granted: —
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Expires: 2012-03-24
Abstract
Abstract An antenna for an automobile rear window uses a coil (14,15) connected directly to a bus (5,6) for defogging heaters (3) used as an FM subsidiary antenna and a T-shaped impedance matching circuit (13) to provide a monotonic change of impedance within the FM frequency band. An inverted T-shaped FM main antenna (4) is employed in conjunction with the FM subsidiary antenna (3) to provide a diversity system to enhance receiving sensitivity in all directions.
Inventors
- 👤 Harunori Murakami
- 👤 Kanta Urakami
- 👤 Yuji Baba
- 👤 Nobuya Niizaki
- 👤 Hirofumi Natsume
- 👤 Masato Arisawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 10:38
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/12; H01Q1/1271; H01Q1/1278
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A glass antenna for an automobile comprising: a first antenna provided on a window glass of said automobile and having a reverse T-shape; a second antenna provided on said window glass and consisting of defogging heaters; a bus provided on said window glass and connected to said defogging heaters to be supplied to the defogging current; and a coil directly connected to said bus to prevent an FM signal from leaking.
Claim 2
Dependent Claim
35 words
A glass antenna according to claim 1, further comprising a land provided on said window glass to receive said defogging current, and said coil being a leadless component connected between said bus and said land.
Claim 3
Dependent Claim
30 words
A glass antenna according to claim 2, wherein said first antenna comprises a horizontal line paralleled to the most significant heater of said heaters and having a predetermined distance thereto.
Claim 4
Dependent Claim
25 words
A glass antenna according to claim 3, wherein said horizontal line has a length of about 500 millimeter and said distance of about 10 millimeter.
Claim 5
Dependent Claim
27 words
A glass antenna according to claim 1, further comprising a lateral T pattern paralleled to said bus connected to said second antenna to provide a coupling capacitor.
Claim 6
Dependent Claim
30 words
A glass antenna according to claim 5, wherein said lateral T pattern has a length of about 250 millimeter and includes a center line having about 10 millimeter in length.
Claim 7
Dependent Claim
106 words
A glass antenna system for an automobile comprising: a first antenna provided on a window glass of said automobile and having a reverse T-shape; a second antenna provided on said window glass and consisting of defogging heaters; a bus provided on said window glass and connected to said defogging heaters to be supplied to the defogging current; a coil directly connected to said bus to prevent a FM signal from leaking; and a T type impedance matching circuit provided on said window glass, coupled to said second antenna through said bus and having its I/O port for supplying said FM signal and receiving a control voltage.
References Cited (Backward Citations)
DE3409979A1
Cited
DE3910031A1
Cited
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