Antenna, wireless communication module, package receiving apparatus, and package receiving system
An antenna includes an antenna body and a housing case. The antenna body configured to enter a first mode exhibiting an artificial magnetic conductor character with respect to an electromagnetic wave in a first frequency band and configured to enter in a second mode (TM mode) serving as a resonator for the electromagnetic wave in a second frequency band higher than the first frequency band. The housing case includes a bottom plate on which the antenna body is installed and a side wall provided standing from the bottom plate and spaced with a distance from a periphery of the antenna body. The housing case is a case made of metal including an opening in a face through which the electromagnetic wave enters and exits.
1. An antenna, comprising:
an antenna body configured to enter a first mode exhibiting an artificial magnetic conductor character with respect to a first electromagnetic wave in a first frequency band and enter a second mode serving as a resonator for a second electromagnetic wave in a second frequency band higher than the first frequency band; and
a housing case including a bottom plate on which the antenna body is installed and a side wall provided standing from the bottom plate and spaced with a distance from a periphery of the antenna body, the housing case being made of metal and comprising an opening in a face through which the first electromagnetic wave or the second electromagnetic wave enters and exits.
2. The antenna according to claim 1 , wherein
the distance between the antenna body and the side wall is λ/8 or more, where λ is a wavelength of the second electromagnetic wave.
3. The antenna according to claim 2 , wherein
the distance between the antenna body and the side wall is λ/4.
4. The antenna according to claim 1 , further comprising a cover made of resin and configured to close the opening of the housing case.
5. A wireless communication module, comprising:
an antenna, comprising:
an antenna body configured to enter a first mode exhibiting an artificial magnetic conductor character with respect to a first electromagnetic wave in a first frequency band and enter a second mode serving as a resonator for a second electromagnetic wave in a second frequency band higher than the first frequency band; and
a housing case including a bottom plate on which the antenna body is installed and a side wall provided standing from the bottom plate and spaced with a distance from a periphery of the antenna body, the housing case being made of metal and comprising an opening in a face through which the first electromagnetic wave or the second electromagnetic wave enters and exits; and
an RF module housed in the housing case and electrically connected to the antenna body.
6. A package receiving apparatus, comprising:
a wireless communication module;
a package receiving box provided with the wireless communication module and configured to house a package; and
a controller electrically connected to the wireless communication module and configured to manage the package housed in the package receiving box,
wherein the wireless communication module comprises:
an antenna, comprising:
an antenna body configured to enter a first mode exhibiting an artificial magnetic conductor character with respect to a first electromagnetic wave in a first frequency band and enter a second mode serving as a resonator for a second electromagnetic wave in a second frequency band higher than the first frequency band; and
a housing case including a bottom plate on which the antenna body is installed and a side wall provided standing from the bottom plate and spaced with a distance from a periphery of the antenna body, the housing case being made of metal and comprising an opening in a face through which the first electromagnetic wave or the second electromagnetic wave enters and exits; and
an RF module housed in the housing case and electrically connected to the antenna body.
7. The package receiving apparatus according to claim 6 , wherein
the wireless communication module is provided with a face on a side of the opening of the antenna facing a front of the package receiving box.
8. A package receiving system, comprising:
the package receiving apparatus according to claim 6 ; and
a communication apparatus configured to receive package information wirelessly transmitted from the package receiving apparatus.
9. The package receiving system according to claim 8 , wherein
the communication apparatus is a wireless communication apparatus.
10. The package receiving system according to claim 8 further, comprising:
a wireless communication apparatus configured to receive information transmitted from the communication apparatus.