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Essay on wearable antennas
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I. INTRODUCTION Wearable antennas are made by textile materials. Electrical properties of these textile materials are not readily available. Wearable antennas are designed to work in the complicated body centric environment. Performance of wearable antenna near to human body is different from free space performance. Effects on the antenna near human body are reduction of antenna gain, cross polarization level growth, radiation pattern fragmentation, and decreased antenna efficiency. These effects can be minimized by making good isolation between human body and antenna. Good isolation can be achieved by putting ground plane or by making space between human body and antenna. Biological effect of wearable antennas can be defined in terms of …show more content…
EBG based antenna is also examined under bent as well as crumpling condition. Performance of EBG based antenna and simple CPW antenna is done. Bending and crumpling effect in EBG based antenna is lesser than simple CPW antenna [5]. F. Pekka Salonen , Peter de Maagt.“ Practical Design Aspects for Textile Antennas.” AP-S 2013. Requirements for the materials include the temperature tolerance, durability, physical abrasion, water absorption, stress with the structural characteristics of the fabric to maintain the electrical functionality under the environmental condition. Textile cover can be used to protect antenna in real life system [6]. III. SUMMARY OF LITERATURE REVIEW Different techniques are discussed in this review paper for dealing with different issues of designing wearable antennas. Electrical and dielectric properties of textile materials are not readily available. So, it needs to be calculated first. Detuning effect due to human body can be minimized by putting conductive layer between antenna and human tissue. Bending effect of antenna can be reduced by using EBG structure. Water absorption effect on antenna also can be minimized by choosing appropriate materials. By putting cover to antenna, we can reduce effect of physical abrasion and other environmental
Furthermore, Under Armour’s goal is to expand their wearable watches and bracelets into built-in sensors that go into the clothing they create. This product will allow consumers to be accessory free and still will be able to track their activity levels. This innovative idea will surely bring in consumers, and provide Under Armour with the push they need to directly compete
Nature of wave: It is an electromagnetic wave as it does not necessarily require a medium for p...
This can be further illustrated by our inability to detect radio waves which are passing through our bodies and homes continuously. A radio receptor found in the simplest radio devices, have...
U.S. Congress, Office of Technology Assessment, The U.S. Textile and Apparel Industry: A Revolution in Progress–Special Report, OTA-TET-332 (Washington, DC: U.S. Government Printing Office, April 1987). <http://www.wws.princeton.edu/cgi-bin/byteserv.prl/~ota/disk2/1987/8733/873306.PDF>
Cell phones use radio frequencies to transmit signals. Radio Frequencies (RF) are a form of electrical waves similar to those used in radios, microwaves, radars or satellite stations. They are emitted from a transmitter, and received using an antenna. This telephony technology is restricted geographically to small zones called “Cells”. Every cell has a base station capable of sending and receiving radio waves. When a call is started a signal leaves the handheld unit headed to the closest base station. This station answers by allocating a specific channel to the unit. When this “channel” is established, modulated radio frequency signals are both received and transmitted. The head of the user is in the near field of use because the distance from the antenna to the head is a few centimeters. (Blettner & Berg 2000) If the antenna is inside the body of the phone, the exposure to Radio Frequencies is greater. The antenna might be requesting a stronger signal to contest with the interference of the battery or the actual shell of the phone’s body.
With more cell phone use the more people are exposed to the radiation they give off. Cell phones give off a microwave radiation, a non-ionizing electromagnetic radiation, and with the uprising of cell phones it has a potential threat to human health. “The microwaves from cellular phones almost contain all the bands of electromagnetic spectru...
Several assistive listening devices can improve the communication ability of deaf children. According to IDEA, every child with a disability is entitled to have access to assistive technology (California Department of Education, 2004). The California Department of Education (2004) outlines IDEA’s definition of an assistive technology device. It explains that this device consists of “any item, piece of equipment or product system…that is used to increase, maintain, or improve functional capabilities of a child with a disability” (California Department of Education, 2004, p. 1).
Bulletproof clothing is the most interesting thing I have ever seen in my life. There is not really a problem of bulletproof clothing besides it is very expensive to make it. It is very expensive just because of the materials. The materials are spider-silk, vectran and Kevlar. The history of bulletproof has been worn for thousands of years. Even the medieval Europe worn body armor. By the 1500’s, they changed the development of cannons and guns. Bulletproof in the encyclopedia means the protection of bullets, knives and puncture wounds. They have made antiballistic protective clothing. The material of it is single layer or multilayer package. The bulletproof clothing basically looks like a very strong net.
The capacitance of the human body is used to model the human body discharge. First of all, the capacitance between the soles of the feet and ground is the primary contributor to the body capacitance besides the 50 pF of free space capacitance. In figure 15.2, the feet show 50 pF per foot. As the person going near to other surrounding objects, the additional capacitance of range from 50 to 100 pF may
Coating is a process that used in textile to import new desirable properties in textile material. Material painted over the textile substrate. According to the Textile Institutes a coated textile can be defined as: A material composed of two or more layers, in which at least one of the layers is a textile fabric and at least one of the other layers is an extensively continuous polymeric layer.
To sum up, our proposal of new smart clothes product—Chameleon will open up a new market share of smart warm clothes. Chameleon is a green smart clothes which integrates with the latest technology in textile fabric and encourages the reusing message of a single garment with consumers’ own design. In comparison to other smart clothes, Chameleon allows more flexibility and is more environmental protective. So far, further research is need in the creative use and design of electrochromic material and fabrication.
The waves can be absorbed and reflected by surrounding objects before they reach the nearest cell tower. For example when you put your phone next to your head, during a...
For long term and long distance monitoring, implantable sensors are desirable. Implantable sensors are inserted into human body so that it does not disturb the patients’ activities. Of course, the implanted devices should be able to communicate to the outside world without using wire because “wires passing through the skin are a source of infection, can result in injury (if pulled or knocked), and are often uncomfortable for the patient” [1]. Beside the purpose of monitoring, implantable devices can also be used for more complex prescription applications, such as implantable drug delivery system, implantable insulin pump, and so on.
To my mind after today’s standards - 3D and 4K- movies are going to come to a new level of entertainment. I am not talking about higher resolutions or better surround sound, but about blurring the line between the physical and the digital world. In other words, the move from watching a movie to being part of a movie. I might be wrong but who would not like to play his favorite character in a movie, interact with other characters and affect the movie’s outcome? Wireless bodysuits will make the audience feel, what their characters fee...