Invented by Kazuhisa Takagi, Yuko Takami, Yuji Koyamashita, ASAHI FR R&D Co Ltd, Asahi R&D Co Ltd

The market for dielectric raw materials, antenna devices, portable phones, and electromagnetic wave shielding bodies has witnessed significant growth in recent years. With the increasing demand for advanced communication technologies and the rising concerns regarding electromagnetic radiation, these products have become essential in various industries. Dielectric raw materials play a crucial role in the production of electronic components and devices. These materials possess unique electrical properties that allow them to store and release electrical energy efficiently. They are extensively used in the manufacturing of capacitors, insulators, and other electronic components. The dielectric constant and loss tangent are two important parameters that determine the performance of these materials. Advancements in dielectric materials have led to the development of high-performance electronic devices with improved efficiency and reliability. Antenna devices are essential components in wireless communication systems. They are used to transmit and receive electromagnetic waves, enabling seamless connectivity and data transfer. The demand for antenna devices has surged with the rapid growth of wireless communication technologies such as 5G and IoT. These devices are now being integrated into various applications, including smartphones, automobiles, and smart home devices. The market for antenna devices is expected to witness substantial growth in the coming years, driven by the increasing adoption of wireless communication technologies and the need for high-speed data transfer. Portable phones, commonly known as smartphones, have revolutionized the way we communicate and access information. These devices have become an integral part of our daily lives, offering a wide range of features and functionalities. The market for portable phones has witnessed tremendous growth, with manufacturers constantly introducing new models with advanced technologies. The demand for smartphones is fueled by factors such as increasing internet penetration, rising disposable incomes, and the growing popularity of social media platforms. The integration of antenna devices and dielectric materials in smartphones has enabled faster and more reliable communication, contributing to their widespread adoption. Electromagnetic wave shielding bodies are designed to protect electronic devices and human beings from the harmful effects of electromagnetic radiation. With the increasing use of electronic devices and the proliferation of wireless communication technologies, concerns regarding electromagnetic radiation have grown. Electromagnetic wave shielding bodies are used in various applications, including medical equipment, aerospace, automotive, and telecommunications. These bodies are made using materials with high electrical conductivity, such as metals and conductive polymers. The market for electromagnetic wave shielding bodies is expected to witness significant growth due to the rising awareness about the potential health risks associated with electromagnetic radiation exposure. In conclusion, the market for dielectric raw materials, antenna devices, portable phones, and electromagnetic wave shielding bodies is experiencing rapid growth. The demand for these products is driven by the increasing adoption of advanced communication technologies, the need for faster and more reliable connectivity, and the rising concerns regarding electromagnetic radiation. As technology continues to advance, the market for these products is expected to expand further, offering new opportunities for manufacturers and suppliers in the industry.

The ASAHI FR R&D Co Ltd, Asahi R&D Co Ltd invention works as follows

The dielectric material A has carbons dispersed within a silicone rubber material 1. In any of the dielectric materials A, 1), there are 150 to 300 pts.wt. Carbons are dispersed in a silicone rubber base material 1, wherein any one of the dielectric raw materials A, 1) contains 150 to 300 pts.wt. Carbons per 100 pts.wt.

Background for Dielectric raw materials, antenna device and portable phone, electromagnetic wave shielding body

Traditionally, portable phone manufacturers have demanded that they be light in weight, thin and small. They also asked for a new technology to reduce the thickness, weight and size. A request was made for an improved antenna radiation efficiency. Patent Document 1 reveals a technology that can enhance the antenna radiation efficiency of a portable telephone without compromising its compactness or lightness. Patent Documents 2 through 4, for instance, disclose technologies to enhance the antenna radiation efficiency in portable phones.

Recently however, an increased antenna radiation efficiency was requested to further reduce the thickness of mobile phones. To meet this demand, it’s necessary to create a dielectric material with an enhanced permittivity. When a dielectric material is used to increase the magnetic permeability of an electromagnetic wave shielding, it tends to make the body heavier. In recent years, the demand for portable phones with an antenna body built in has increased, as well as a tendency to reduce their size. A portable phone with an integrated antenna device has a close proximity between the antenna body and the feeding point. The conventional sheet of magnet material (electromagnetic waves controlling body) would reduce the antenna radiation efficiency if placed near the antenna body. Therefore, it was difficult to use such a sheet for an antenna built into a mobile phone.

In recent years, a growing number of apartment buildings made of ferroconcrete have been fitted with electric cooking stoves that use electromagnetic waves instead of gas cookers. In response to this trend, the development of an electromagnetic wave shielding device is required in order to protect the body from electromagnetic waves produced by an electric cooker during cooking.

DISCLOSURE of INVENTION

Problems that can be solved by invention

The present invention was made taking into consideration the above-mentioned circumstance, and one object of the invention is to provide dielectric raw materials having a high permistivity. It is also an object of the invention to provide a dielectric raw-material electromagnetic wave shielding material that can enhance antenna radiation efficiency even when disposed near the antenna body. This is especially useful for a built in antenna device in a mobile phone. It is also an object of the invention to provide a mobile phone that can be reduced in size, weight and thickness, while enhancing the antenna radiation efficiency, using an electromagnetic shielding body containing the dielectric material. It is also an object of the invention to provide a dielectric raw-material-containing electromagnetic wave shielding material that can effectively shield electromagnetic waves, such as those generated by an electric cooker.

Means to Solve the Problems

The present inventors conducted extensive and intensive investigations to achieve the above objectives. The investigations have revealed that when carbons in a silicone base material are arranged in a way to increase the mutual contact between carbons and form a carbon network, this increases the electrostatic capacitance, resulting in a dielectric material with a greater permittivity. Further intensive and extensive investigations have revealed that a dielectric material of this type can enhance the antenna radiation efficiency, even if it is placed near the antenna body. The present invention is completed based on the findings.

Accordingly to the present invention there is (1) a dielectric material with carbons dispersed within a silicone base material that contains a silicone as its main material. This can be in either of 1) to 3 described below. The carbons in the silicone rubber are not evenly distributed or they are arranged with at least some of them contacting one another.

1) A dielectric raw-material containing 150 to $300 parts by weight carbons per every 100 parts of silicone rubber.

2) A dielectric raw material that is formed by crosslinking a mixture consisting of silicone rubber in its uncrosslinked state and a noncrosslinked organic polymer, and carbons.

3) A dielectric raw material, formed by combining at least two different types of carbons, selected from flat carbon, spherical or spherical, carbon fibers with an aspect of no more than 11, carbon nanotubes, and conductive carbon.

In this case, it is preferred that the dielectric material described in (1) has at least a part of its surface with conduction pathways.

According to the present invention there is also (2) an antenna device that includes the dielectric raw materials as described in (1).” Preferably, the antenna described in (2) is an antenna built into a mobile phone.

Furthermore,” says the present invention, “there are also provided (3) a mobile phone equipped with a dielectric wave shielding material described in (1), and (4) utilizing the dielectric material described in the (1). The electromagnetic wave-shielding body described in (4) is preferably an electric cook electromagnetic wave-shielding body to shield electromagnetic waves generated by the electric cooker.

Effects Of The Invention

The dielectric material of the invention can be used to produce a dielectric material with a high permittivity that is also lightweight and flame resistant. The antenna device can also be improved in antenna radiation efficiency even when an electromagnetic wave-controlling body is located near an antenna body. This is especially useful for a built in antenna of a mobile phone. The portable phone of the invention can also be made lighter, thinner and smaller, while extending the cell life by increasing the antenna radiation efficiency. The electromagnetic wave shielding of the present invention can also be used to create an electromagnetic wave-shielding body that can shield electromagnetic waves and protect the body by shielding electromagnetic waves from electric cookers, for example.

BRIEF DESCRIPTION DES DRAWINGS

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