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    • 117. 发明公开
    • ANTENNA DEVICE
    • EP3836303A1
    • 2021-06-16
    • EP18929811.0
    • 2018-08-10
    • Morita Tech Co., Ltd.
    • MORITA, OsamuSAEKI, AkinoriOKAMOTO, KeiOGURA, Satoshi
    • H01Q5/50H01Q1/48H01Q5/25
    • By performing continuous matching in an entire frequency band from 600 MHz to 6 GHz by one antenna device, communication with a plurality of types of communication devices having different used frequency bands becomes possible without switching the antenna device.
      In the antenna device, a first insulating plate 40, a capacitive coupling portion 45a of a tuning plate 45, a radio wave absorber 50, a grounding portion 45b of the tuning plate 45 folded back to the back side of the radio wave absorber 50, and a tuning coated plate 55 provided with a metallic plated film formed on the surface thereof are sequentially stacked below an antenna element 30 having a shape obtained by removing an arched portion from a copper circular plate.
      Power is supplied from a center conductor 64 of a semi-rigid signal input member 61 to a power feeding unit 33 provided in a part of a circular outer edge 32 of the antenna element 30. An external conductor 62 of the signal input member 61 is held between conductive cushions 80a and 80b that are elastically deformable. A grounding plate 85 is conductive with the external conductor 62, to ground the grounding portion 45b and the tuning coated plate 55.