Abstract
This paper describes a sheet-like transmission line for constructing a short-range wireless communication system using flexible materials such as clothing. As a new application of wireless communications, it is desired to construct a Personal Area Network (PAN) and a sensor network with a short distance communication area of about 1 m to 2 m. For such applications, a waveguide of a new structure is required which can exchange information at an arbitrary place on the waveguide, which has a flexible structure and limits the area for wireless communication. Therefore, by disposing the microstrip type resonators two-dimensionally with a two-layer structure and electromagnetically strongly coupling the resonators, the electromagnetic waves are confined well within the transmission line, and the antenna of the wireless device resonator is arranged. Furthermore, by constructing this transmission line with a sheet-like flexible wearable material, the transmission of both information and power can be performed through a thin flexible transmission line for the wearable network.
Highlights
Wired communications using coaxial cables and optical fibers, and wireless communications that propagate electromagnetic waves in free space using antennas, are common forms of communications.Wired communications have low propagation loss due to the communication line, and for this reason, they are advantageous for high-speed communications and high security
If you can construct a transmission line with a flexible material, you can wear it in a similar way to clothes, and you can achieve a good affinity with wearable devices through activities such as sensing of biological activity information and its transmission
If wired communication with cables is expressed as one-dimensional communication, and wireless communication using antenna radiation is expressed as three-dimensional communication, communication by a sheet-like waveguide can be expressed as two-dimensional communication and can be thought of as a new physical layer of communication
Summary
Wired communications using coaxial cables and optical fibers, and wireless communications that propagate electromagnetic waves in free space using antennas, are common forms of communications. If wired communication with cables is expressed as one-dimensional communication, and wireless communication using antenna radiation is expressed as three-dimensional communication, communication by a sheet-like waveguide can be expressed as two-dimensional communication and can be thought of as a new physical layer of communication. In order to cope with wireless communication problems between wearable devices, the concept of a body area network (BAN) is proposed [3,4,5]. We provide an example in which a two-dimensional waveguide using a conductive cloth is applied to a wearable transmission line will be described. This clarifies that electric power, as well as information, can be supplied
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