Title:
COMPOSITE ANTENNA DEVICE
Document Type and Number:
Japanese Patent JP2019062373
Kind Code:
A
Abstract:
To provide a composite antenna device that includes a magnetic field antenna using a coil and another type of antenna and can be made compact while preventing deterioration in performance of the magnetic field antenna.SOLUTION: A composite antenna device 1 is housed in a door handle provided on a vehicle and includes a first antenna 11 configured as a bar antenna and a second antenna 12 configured as a dipole antenna. The first antenna 11 is a magnetic field antenna for transmitting radio waves in a low frequency (LF) band and the second antenna 12 is an electric field antenna for transmitting and receiving radio waves in a 2.4 GHz band. The first antenna 11 and second antenna 12 are connected with a common power supply line 14. A switch 20 is provided between a transmission IC 162 for generating LF signals and the power supply line 14. When the LF signals are not transmitted, the switch 20 is set to off.SELECTED DRAWING: Figure 5
Inventors:
MITSUHARU KENICHIRO
SHINODA TAKUJI
NAKAMURA KAZUNARI
YAMAGUCHI TAICHI
SHINODA TAKUJI
NAKAMURA KAZUNARI
YAMAGUCHI TAICHI
Application Number:
JP2017185032A
Publication Date:
April 18, 2019
Filing Date:
September 26, 2017
Export Citation:
Assignee:
SOKEN INC
DENSO CORP
DENSO CORP
International Classes:
H01Q21/30; B60R11/02; B60R25/24; H01Q1/22; H01Q1/32; H01Q1/50; H01Q7/08; H01Q9/16
Attorney, Agent or Firm:
Kazuyuki Yahagi
Taihei Nonobe
Takanori Kubo
Taihei Nonobe
Takanori Kubo