Radio apparatus, radio system, and heat dissipation structure

1 . A radio apparatus comprising a radiating element or a reflective element of a radio signal, and a heat dissipation part configured to dissipate heat generated by a heat generation source including the radiating element or the reflective element to an outside, wherein

the heat dissipation part is composed of a solid material having a thermal conductivity and an electrical conductivity, and comprises a heat dissipation plate and a plurality of heat dissipation fins provided in the heat dissipation plate, the plurality of heat dissipation fins being disposed on a side of the heat dissipation plate where the radiating element or the reflective element is disposed,

the heat dissipation fins form a periodic structure along at least one direction on the heat dissipation plate, the heat dissipation fins having a rod-like shape or a plate-like shape,

tips of the plurality of heat dissipation fins form a virtual reflective surface that reflects incident waves to the plurality of heat dissipation fins,

a distance between the heat dissipation fins is shorter than a height of the heat dissipation fins, and

the heat dissipation fins are arranged to surround the radiating element or the reflective element in order to provide an Electrical Band Gap (EBG) structure around a periphery of the radiating element or the reflective element.

2 . The radio apparatus according to claim 1 , wherein the virtual reflective surface prevents propagation of a radio wave of a predetermined frequency and functions as a magnetic wall of the predetermined frequency.

3 . The radio apparatus according to claim 1 , wherein the virtual reflective surface is disposed at a position where a phase shift amount due to reflection is different from 180 degrees and a phase of a radiation wave from the radiating element or the reflective element and a phase of a reflected wave from the virtual reflective surface are in phase with each other on a radiation surface of the radiating element or the reflective element with regard to a radio wave of a predetermined frequency.

4 . The radio apparatus according to claim 1 , wherein a length of the heat dissipation fin is λ×(N/2+A×¼), where λ is a wavelength of a predetermined frequency, N is an integer greater than or equal to zero, and A is an arbitrary constant greater than 0.

5 . The radio apparatus according to claim 1 , wherein

a plurality of reflective elements form a periodic array,

the plurality of reflective elements form a part of the virtual reflective surface, and

a reflection angle of a reflected wave on the virtual reflective surface is controlled by a structure and an array of the plurality of reflective elements periodically arrayed.

6 . A radio system comprising:

the radio apparatus according to claim 1 ; and

signal processing means for processing a radio signal transmitted and received by an antenna element, the antenna element being the radiating element of the radio apparatus.

7 . The radio system according to claim 6 , comprising a plurality of the antenna elements, wherein the plurality of antenna elements are connected to the signal processing means by a signal transmission cable and are discretely arranged.

8 . A heat dissipation structure configured to dissipate heat generated by a heat generation source including a radiating element or a reflective element of a radio signal to an outside, wherein

the heat dissipation structure is composed of a solid material having a thermal conductivity and an electrical conductivity, and comprises a heat dissipation plate and a plurality of heat dissipation fins provided in the heat dissipation plate, the plurality of heat dissipation fins being disposed on a side of the heat dissipation plate where the radiating element or the reflective element are disposed,

the heat dissipation fins form a periodic structure along at least one direction on the heat dissipation plate, the heat dissipation fins having a rod-like shape or a plate-like shape, and

tips of the plurality of heat dissipation fins form a virtual reflective surface that reflects incident waves to the plurality of heat dissipation fins,

a distance between the heat dissipation fins is shorter than a height of the heat dissipation fins, and

the heat dissipation fins are arranged to surround the radiating element or the reflective element in order to provide an Electrical Band Gap (EBG) structure around a periphery of the radiating element or the reflective element.

9 . A radio apparatus comprising a heat dissipation structure configured to dissipate heat generated by a heat generation source including a radiating element or a reflective element of a radio signal to an outside,

wherein

the heat dissipation structure is composed of a solid material having a thermal conductivity and an electrical conductivity, and comprises a heat dissipation plate and a plurality of heat dissipation fins provided in the heat dissipation plate, the plurality of heat dissipation fins being disposed on a side of the heat dissipation plate where the radiating element or the reflective element are disposed,

the heat dissipation fins form a periodic structure along at least one direction on the heat dissipation plate, and

tips of the plurality of heat dissipation fins form a virtual reflective surface that reflects incident waves to the plurality of heat dissipation fins,

wherein

the heat dissipation fin comprises:

a rod-like heat dissipation fin body protruding from the heat dissipation plate; and

a planar patch provided at a tip of the heat dissipation fin body,

a length of the heat dissipation fin body is shorter than λ×(N/2+¼), where λ is a wavelength of a predetermined frequency and N is an integer greater than or equal to zero, and

the virtual reflective surface is composed of a plurality of patches.