Feeding structure of antenna device for motor vehicle and antenna device

An antenna device for a motor vehicle, comprising:

• a feeding structure of an antenna device for a motor vehicle for feeding a planar antenna formed on one surface of a window glass panel for the motor vehicle from a cavity module including an electronic circuitry, the module being mounted on the window glass panel so as to cover the planar antenna, wherein
• the planar antenna includes a hot antenna having a approximately rectangular outline, two opposing corners on one diagonal line thereof forming perturbed portions, and a ground antenna element surrounding the hot antenna element,
• the feeding structure includes,
• a first feeding element located in the module opposing to the planar antenna at a predetermined distance therefrom,
• a second feeding element located in the module opposing to the planar antenna at a predetermined distance therefrom, and a feeder for connecting the fist and second feeding elements to the electronic circuitry, a signal conductor thereof being a transmission line capable of coupling to the electromagnetic field in the module, and
• there are relationships 0<Shh<Se and 0<She<Shh among Shh, She and Se, wherein Shh is the overlapped area of the first feeding element to the hot antenna element, She is the overlapped area of the first feeding element to the ground antenna element, and Se is the overlapped area of the second feeding element to the ground antenna element.

An antenna device for a motor vehicle, comprising:

• a feeding structure of an antenna device for a motor vehicle for feeding a planar antenna formed on one surface of a window glass panel for the motor vehicle from a cavity module including an electronic circuitry, the module being mounted on the window glass panel so as to cover the planar antenna, wherein
• the planar antenna includes a hot antenna having a approximately rectangular outline, two opposing corners on one diagonal line thereof forming perturbed portions, and a ground antenna element surrounding the hot antenna element,
• the feeding structure includes,
• a first feeding element located in the module opposing to the planar antenna at a predetermined distance therefrom,
• a second feeding element located in the module opposing to the planar antenna at a predetermined distance therefrom, and
• a coaxial feeder for connecting the fist and second feeding elements to the electronic circuitry,
• there are relationships 0<Shh<3Se and 0<She<Shh among Shh, She and Se, wherein Shh is the overlapped area of the first feeding element to the hot antenna element, She is the overlapped area of the first feeding element to the ground antenna element, and Se is the overlapped area of the second feeding element to the ground antenna element.