Wireless communication apparatus
In a wireless communication apparatus according to the present invention, an antenna including an antenna element is disposed at a position closer to an opening of an outer housing than to a fixing member formed of an electric conductor and configured to fix the antenna, and an electric supply unit configured to supply the antenna with electric power and a first region that is positioned on an electric supply unit side of the antenna element are disposed closer to the fixing member than a second region including an open end portion of the antenna element.
1. A wireless communication apparatus comprising:
an antenna including an antenna element having a connection portion and an open end portion, wherein the antenna element has a path length between the connection portion and the open end portion;
a conductor member formed of an electric conductor;
an electric supply unit electrically connected to the connection portion of the antenna element and configured to supply electric power to the antenna; and
an outer housing formed of an electric conductor and configured to enclose the antenna, the conductor member, and the electric supply unit, the outer housing having an opening for allowing electromagnetic waves from the antenna to radiate outward from the outer housing,
wherein the antenna is disposed at a position closer to the opening of the outer housing than to the conductor member, and
the connection portion and a midpoint corresponding to a half length of the path length of the antenna element are located closer to the conductor member than a surface of the open end portion, and the surface of the open end portion is a surface facing the conductor member side.
2. The wireless communication apparatus according to claim 1 , wherein at least part of the antenna is configured to overlap the opening when viewed from a direction perpendicular to an opening face of the opening.
3. The wireless communication apparatus according to claim 1 , wherein a second region of the antenna element including the open end portion is disposed at a position closer to the opening of the outer housing than a first region of the antenna element including the connection portion.
4. The wireless communication apparatus according to claim 3 , wherein the first region of the antenna element is included in a region between the connection portion and the midpoint.
5. The wireless communication apparatus according to claim 4 , wherein a longest distance between the conductor member and the antenna element is a first distance,
a shortest distance between the conductor member and the antenna element is a second distance,
a difference between the first distance and the second distance is a third distance,
a sum of a distance of ½ of the third distance and the second distance is a fourth distance,
a longest distance between the conductor member and the first region is shorter than the fourth distance.
6. The wireless communication apparatus according to claim 1 , wherein the antenna further includes a projection between the antenna element and the conductor member, the projection being formed of an electric conductor and having a projecting shape.
7. The wireless communication apparatus according to claim 1 , wherein
the antenna is a dipole antenna including a first antenna element and a second antenna element as the antenna element,
the first antenna element and the second antenna element each have one end portion that forms the open end portion, and
the electric supply unit is provided between another end portion of the first antenna element and another end portion of the second antenna element.
8. The wireless communication apparatus according to claim 7 , further comprising
a supporting member configured to support the antenna and fixed to the conductor member, wherein
the supporting member is configured to support the first antenna element and the second antenna element in a linear pattern from the one end portion to the other end portion of each of the first antenna element and the second antenna element.
9. The wireless communication apparatus according to claim 7 , further comprising
a supporting member configured to support the antenna and fixed to the conductor member, wherein
the supporting member is configured to support the first antenna element and the second antenna element from the one end portion to the other end portion of each of the first antenna element and the second antenna element in at least one of a folded pattern and a curved pattern.
10. The wireless communication apparatus according to claim 1 , wherein
the antenna is an inverted-F antenna further including a ground conductor portion to be used as a ground of the antenna element, and
the antenna element includes one end portion forming the open end portion, another end portion short-circuited to the ground conductor portion, and a portion between the one end portion and the other end portion, the portion configured to serve as a power supply line electrically connected to the electric supply unit.
11. The wireless communication apparatus according to claim 10 , further comprising
a supporting member configured to support the antenna and fixed to the conductor member, wherein
the supporting member is configured to support the antenna element and the ground conductor portion in a planar pattern.
12. The wireless communication apparatus according to claim 10 , further comprising
a supporting member configured to support the antenna and fixed to the conductor member, wherein
the supporting member is configured to support the antenna element and the ground conductor portion in at least one of a folded pattern and a curved pattern.
13. The wireless communication apparatus according to claim 1 , wherein
the antenna is an inverted-F antenna further including an electric conductor portion formed of an electric conductor, and
the antenna element includes one end portion forming the open end portion, another end portion short-circuited to the electric conductor portion, and a portion between the one end portion and the other end portion, the portion configured to serve as a power supply line electrically connected to the electric supply unit.
14. The wireless communication apparatus according to claim 1 , wherein
the antenna is a monopole antenna further including a ground conductor portion to be used as a ground of the antenna element, and
one end portion of the antenna element forms the open end portion, and the electric supply unit is provided between another end portion of the antenna element and the ground conductor portion.
15. The wireless communication apparatus according to claim 1 , wherein
the antenna is a monopole antenna further including an electric conductor portion formed of an electric conductor, and
one end portion of the antenna element forms the open end portion, and the electric supply unit is provided between another end portion of the antenna element and the electric conductor portion.
16. The wireless communication apparatus according to claim 1 , wherein the wireless communication apparatus is a digital radiography further including a sensor configured to detect radioactive rays.