US 11,688,933 B2
Vehicular antenna device
Seung-Ho Choi, Anyang-si (KR)
Assigned to LS MTRON LTD., Anyang-si (KR)
Appl. No. 16/606,498
Filed by LS MTRON LTD., Anyang-si (KR)
PCT Filed Apr. 26, 2018, PCT No. PCT/KR2018/004859
§ 371(c)(1), (2) Date Oct. 18, 2019,
PCT Pub. No. WO2018/199651, PCT Pub. Date Nov. 1, 2018.
Claims priority of application No. 10-2017-0055432 (KR), filed on Apr. 28, 2017; and application No. 10-2018-0046168 (KR), filed on Apr. 20, 2018.
Prior Publication US 2020/0194877 A1, Jun. 18, 2020
Int. Cl. H01Q 1/32 (2006.01); H01Q 1/42 (2006.01); H01Q 15/14 (2006.01); H01Q 1/12 (2006.01)
CPC H01Q 1/3275 (2013.01) [H01Q 1/42 (2013.01); H01Q 15/14 (2013.01); H01Q 1/12 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A vehicular antenna device comprising:
a directional antenna which radiates radio waves in a predetermined direction; and
a radio wave diffusion structure installed vertically above the directional antenna to reflect radio waves radiated upwards from the directional antenna in a lateral direction for omnidirectional spreading,
wherein the radio wave diffusion structure has a reciprocal cone shape with a base facing upwards and an apex facing the directional antenna, characterized in that:
the directional antenna is an array antenna formed in a square panel shape and having an upward directionality, the array antenna including a plurality of unit antenna elements arranged upwards, each of the plurality of unit antenna elements is a patch antenna,
a lateral surface of the radio wave diffusion structure is inwardly curved at a constant radius of curvature R in vertical cross section, and
a magnitude of the constant radius of curvature R satisfies Equation 1 when a magnitude of wavelength of the radiated radio waves is λ:
πλ<R<20λ  [Equation 1]
where h is a vertical direction distance between an apex of the radio wave diffusion structure and the directional antenna satisfies Equation 2:

OG Complex Work Unit Math
wherein d denotes a length of one side of the directional antenna, λ denotes a wavelength magnitude of radio waves radiated from the directional antenna, R denotes the constant radius of curvature of the radio wave diffusion structure, and π denotes a ratio of a circle's circumference to its diameter.