US 12,009,609 B2
Antenna device
Masakazu Ikeda, Nisshin (JP); Yuuji Kakuya, Nisshin (JP); Kenichiro Sanji, Nisshin (JP); Nobuyasu Okabe, Kariya (JP); and Hiroyuki Izumi, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP); and SOKEN, INC., Nisshin (JP)
Filed by DENSO CORPORATION, Kariya (JP); and SOKEN, INC., Nisshin (JP)
Filed on Sep. 24, 2021, as Appl. No. 17/484,207.
Application 17/484,207 is a continuation of application No. PCT/JP2020/002866, filed on Jan. 28, 2020.
Claims priority of application No. 2019-058816 (JP), filed on Mar. 26, 2019.
Prior Publication US 2022/0013913 A1, Jan. 13, 2022
Int. Cl. H01Q 9/04 (2006.01); H01Q 1/42 (2006.01); H01Q 1/48 (2006.01); H01Q 1/52 (2006.01)
CPC H01Q 9/0421 (2013.01) [H01Q 1/42 (2013.01); H01Q 1/48 (2013.01); H01Q 1/526 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An antenna device comprising:
a ground plate made of a conductor with a flat plate shape;
an opposing conductive plate made of another conductor with a flat plate shape, arranged to space apart from the ground plate by a predetermined distance, and having a power supply point electrically connected to a power supply line;
a short-circuit portion electrically connecting the opposing conductive plate and the ground plate; and
a radio wave shield body for shielding a propagation of an electric field, which is arranged on an upper side of the opposing conductive plate and is made of a conductor or a dielectric material, wherein:
parallel resonance at a predetermined target frequency is generated by an inductance provided in the short-circuit portion and a capacitance between the ground plate and the opposing conductive plate; and
the radio wave shield body is arranged so as to contact with an upper surface of an edge portion of the opposing conductive plate.