ISM band and Applications The ISM (industrial, scientific and medical) radio bands were originally reserved internationally for the use of RF energy for industrial, scientific and medical purposes other than communications. Examples of applications in these bands include radio-frequency process heating, microwave ovens, and medical diathermy machines. The powerful emissions of these devices can create electromagnetic interference and disrupt radio communication using the same frequency, so these devices were limited to certain bands of frequencies. ISM Uses: The most commonly encountered ISM device is the home microwave oven operating at 2.45 GHz. Many industrial settings may use ISM devices in plastic welding processes. In medical settings, shortwave and microwave diathermy machines are ISM devices mostly commonly used for muscle relaxation. Microwave ablation, a type of interventional radiology, is an ISM application which treats solid tumors through the use of RF heating. Some electrodeless lamp designs are ISM devices, which use RF emissions to excite fluorescent tubes. Sulfur lamps are commercially available plasma lamps, which use a 2.45 GHz magnetron to heat sulfur into a brightly glowing plasma. Long-distance wireless power systems have been proposed and experimented with which would use high-power transmitters and rectennas, in lieu of overhead transmission lines and underground cables, to send power to remote locations. NASA has studied using microwave power transmission on 2.45 GHz to send energy collected by solar power satellites back to the ground. Also in space applications, a Helicon Double Layer ion thruster is a prototype spacecraft propulsion engine which uses a 13.56 MHz transmission to break down and heat gas into plasma. Non-ISM uses In spite of the real purpose of ISM bands, there has been rapid growth in its use in low-power, short-range communications platforms. In recent years ISM bands have also been shared with (non-ISM) license-free error-tolerant communications applications such as wireless sensor ne0tworks in the 915 MHz and 2.450 GHz bands, as well as wireless LANs and cordless phones in the 915 MHz, 2.450 GHz, and 5.800 GHz bands. Wireless LAN devices use wavebands as follows: Bluetooth 2450 MHz band falls under WPAN HIPERLAN 5800 MHz band IEEE 802.11/WiFi 2450 MHz and 5800 MHz bands Googles Project Loon uses ISM bands (specifically 2.4 and 5.8 GHz bands) for balloon-to-balloon and balloon-to-ground communications. several brands of radio control equipment use the 2.4 GHz band range for low power remote control of toys, from gas powered cars to miniature aircraft. Worldwide Digital Cordless Telecommunications or WDCT is a technology that uses the 2.4 GHz radio spectrum. Read More at : bit.ly/1sOjp7b
Posted on: Mon, 18 Aug 2014 03:07:39 +0000
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