Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
VEHICLE ANTENNA
Document Type and Number:
Japanese Patent JP2010045740
Kind Code:
A
Abstract:

To provide a vehicle antenna which does not require any balun, is in conformity to a maintenance reference of road transportation vehicles and can be disposed at an upper edge of front glass of a vehicle.

A first element 12 is disposed rectangularly downward to an upper edge 10a of front glass 10, and a second element 14 is disposed along with the upper edge 10a so as to be approximately inversely L-shaped with respect to the first element. A length of the first element 12 is defined as an effective length of a 1/4 wavelength of a transmission/reception frequency band. A length of the second element 14 is defined as an effective length of a 1/4 wavelength of the transmission/reception frequency band, and its width is set to 13 times or more the width of the first element 12 and 25, and not more than 25 mm. A central conductor 16a and an external conductor 16b of a coaxial line 16 are electrically connected to the first element 12 and the second element 14, respectively. Even when a vehicle antenna is operated practically as an unbalanced antenna or electrically connected with an unbalanced coaxial line 16, any balun is not required. The width of the second element 14 is set at 25 mm or less and the vehicle antenna is in conformity to a maintenance standard of road transportation vehicles.


More Like This:
Inventors:
UTAGAWA NAOAKI
ARATA MINORU
SANPO TAKESHI
Application Number:
JP2008000210096
Publication Date:
February 25, 2010
Filing Date:
August 18, 2008
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
YOKOWO SEISAKUSHO KK
International Classes:
H01Q1/50; H01Q1/32; H01Q3/24; H01Q5/10
Domestic Patent References:
JP2008172626A2008-07-24
JP2003249811A2003-09-05
Attorney, Agent or Firm:
森山 哲夫



 
Previous Patent: IMAGE PROCESSING APPARATUS

Next Patent: TERMINAL DEVICE