Abstract: Being a nonrenewable and very efficient source of energy coal has been widely used to produce electricity; in many industries we use coal as a fuel also. Coal mining has been a very dangerous activity, underground mining hazards include gas explosions and suffocation which leads to death of coal miners every year and figures are very alarming. It may cause chronic lung disease and other respiratory disorders and shorten the life expectancy of miners. To overcome this problem we can introduce wirelessly controlled robots with the help of Graphical User Interface (GUI) of MATLAB, which are capable of doing mining and detecting the gas contents and temperature and send it back to the control room. Now the data which is now available in the receiving end determines the further action of robots. The whole process is cost effective and economically sound. Further these wireless robots have broad applications like in wireless home security applications, spy and war robots as they can make thr

• Publication Date: 09-Jul-2012
• DOI: 10.15224978-981-07295099525
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Abstract: In this paper a novel structure of circular microstrip antenna with airgap between ground plane and substrate is analyzed. To enhance the agility of antenna a MOS device is loaded on the patch. Various parameters such as input impedance, resonance frequency, bandwidth, frequency agility, VSWR, radiation pattern etc. of antenna are calculated to investigate the structure. The resonant frequency of proposed 10 mm radius patch with 1 mm airgap is 6.60 GHz. By varying bias voltage of MOS, antenna can be tuned down to 1.571 GHz operating frequency, which makes the antenna suitable for modern communication system such as GPS, UMTS, WiMAX and remote sensing. Frequency agility 76.20% is found for a MOS loaded CMSA with airgap.

• Publication Date: 09-Jul-2012
• DOI: 10.15224/978-981-07-2950-9-9526
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