To adequately control directivity to obtain the maximum gain of a radio wave radiated from an antenna device in the desired direction.
In the integrated mobile antenna device 1, an antenna element 5 for VICS is mounted in a location deviated in the -x direction (direction opposed to the running direction of a vehicle) from the center of a circuit substrate 2. Moreover, a radio wave absorbing material 7 to absorb a leakage current outputted from an antenna element 3 for ETC is provided between the circuit substrate 2 and a ground plate 9. In addition, an antenna element 4 for GPS and the antenna element 3 for ETC are arranged in a positional relation in which the antenna device for GPS operates as a waveguide of the radio wave radiated from the antenna device for ETC.
JPH1154981 | ELECTROMAGNETIC WAVE ABSORBER |
JP5493132 | Radio wave absorber and its design method |
Kiyoshi Ogawa