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In this research article, a compact wideband stack patch antenna array integrated with compact stack electromagnetic band gap (EBG) structure for multiple input multiple output (MIMO) application is proposed. The wide resonance bandwidth is achieved at 2.45 GHz band by stack arrangement of compact meander line slot driven and parasitic patch elements. The isolation bandwidth is matched with resonance bandwidth with the design of a compact stack L slot EBG structure. The polarization diversity and three-layer EBG structure ensure an enhancement in isolation level. To validate the performance of the proposed stack antenna array, a prototype was fabricated and tested for different MIMO parameters. The measured result confirms the effectiveness of the proposed antenna array in a diverse MIMO environment.

Dispersion is one of the basic problems in the optical fiber communication. Chromatic dispersion is one of this type of dispersion. Nowadays we require high data transmission without any substantial loss in a communication system, so optical communication serves as a better choice for high data rate transmission. However it has a dispersion problem. To overcome dispersion in an optical communication system, we proposed a novel type of method to reduce chromatics dispersion in this paper. The proposed method is experimentally implemented and analysed. The eye diagram analysis test confirms achievement of complete reduction of chromatic dispersion in the fiber at long distance communication. Optisystem version 12.0.2 was used as a software tool for experimental validation of proposed method. Optical fiber system implemented in this experiment was designed for bit rate 2.5Gbps at wavelength 1550nm.

As of late, the incessant coal mine security mischances have brought on genuine obstructions and huge monetary misfortunes. It has given high essentials to avoid the underground complications within the mines with better improved in the mine security aspects. In this paper, GSM operated Wireless Sensor (WS)based mine security and safety methodology is presented.Different conditions within the mine have been considered including mine temperature, humidity, Oxygen monitoring, smoke and CO2 levels and so on with control actions. All these conditions are monitored and controlled with the use of WS grids.Remote hubs are allotted for every sensor so that wireless data transmission alongside telemetry applications has been carried out.

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