US 12,261,379 B2
Antenna device
Yuuji Kakuya, Nisshin (JP); Masakazu Ikeda, Nisshin (JP); Kenichirou Sanji, Kariya (JP); Tomokazu Miyashita, Kariya (JP); and Ryozou Fujii, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Nov. 28, 2022, as Appl. No. 18/070,277.
Application 18/070,277 is a continuation of application No. PCT/JP2021/023456, filed on Jun. 21, 2021.
Claims priority of application No. 2020-110670 (JP), filed on Jun. 26, 2020.
Prior Publication US 2023/0092857 A1, Mar. 23, 2023
Int. Cl. H01Q 9/04 (2006.01); H01Q 1/32 (2006.01); H01Q 1/48 (2006.01)
CPC H01Q 9/0421 (2013.01) [H01Q 1/3291 (2013.01); H01Q 1/48 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An antenna device comprising:
a ground plate that is a conductor member with a flat rectangular shape; and
an antenna element that is a conductor member having a feed point electrically connected to a feeder line, wherein
a length of the ground plate in a predetermined direction is shorter than a target wavelength that is a wavelength of a radio wave to be transmitted or received,
the ground plate is connected to a grounding cable at a connection position on the ground plate,
the connection position is shifted from an edge of the ground plate by an odd multiple of ¼ of the target wavelength,
the ground plate has a slit extending from the edge in a lengthwise direction of the ground plate,
a length of the slit in the lengthwise direction is the odd multiple of ¼ of the target wavelength, and
the grounding cable is electrically connected to an innermost end of the slit.