Recently, microstrip patch antennas have become popular. Due to their ubiquity, these antennas have more uses every day. In this research paper, a 2.45 GHz microstrip patch antenna has been reviewed and analyzed. Different substrate materials have been used to make these antennas, and their thickness is different. Various antennas are designed based on the application, such as rectangular, square, triangle, ring, donut, and dipole. Other types of software were used to design the antenna, including CST, HFSS, MATLAB, ADS, and FEKO. Microstrip patch antenna design is a relatively new field of study for wireless applications. Several devices are linked to send or receive radio waves using a single antenna. Antennas designed for 2.45 GHz are used in various wireless communication systems, including television broadcasts, microwave ovens, mobile phones, wireless local area network (WLAN), Bluetooth, global positioning system (GPS), and two-way radios. This article looks at the geometric structures of antennas, including their many parameters and materials and the many different shapes they can take. In addition, the substrate materials, the loss tangent, the thickness, the return loss, the bandwidth, the voltage standing wave ratio (VSWR), the gain, and the directivity of previous articles will also be discussed.

Microcontrollers and their ever growing applications have changed our everyday experience by its feature of programmability, data processing speed and with the consequent intelligences. Through this adventure of invention and engineering, the optoelectronic devices especially the light emitting diodes (LEDs) are used in various fields, such as electronic appliances, optical communication, security, navigation, agro-electronics, etc. To implement these scopes, the LEDs are required to be controlled with a higher degree of precision and flexibility, which is the concern of this work. Towards that various control of a bi-color LED is implemented with a built in alarm system and a liquid crystal display (LCD) for information display; which are automatically controlled by the microcontroller Atmega8. A Light Dependent Resistor (LDR) and a variable resistor (VAR/POT) is used to provide individual input data for comparison, and produces a pre-programmed output to operate the bi-color LED such as LED ON/OFF, LED blinking, LED color changing and alarming. The developed system of a single bi-color LED (0.1-watt) required 0.98μA and 23.5mA current, and 4.88mW and 117.5mW power, during standby and automated blinking sequences (Yellow-Off-Red) respectively; and the buzzer consumed only 0.49mW power for alarming keeping the supply voltage level of 5V. These very low power consumptions and level of power supply voltage lead it to be very compatible with solar power system, and also applicable in local and remote security application. Proteus ISIS 7.7 is used for system design and simulation by which it is proved to be applicable for security purpose. Code Vision AVR is used to write the program code and for burning the microcontroller ATmega8.

A sustainable powered standalone automatic Solar Tracking System is designed and successfully simulated to provide the best alignment of solar panel with position of the sun automatically, to extract an increased efficiency by 40 percent. A very low cost (approx. 5 USD), high precision Solar Tacking Sensor has been designed to rotate the solar panel coupled to the stepper motor rotates 25.70 degree at single step and to tracks the whole 180-degree trace in 8 (eight) steps per day with greater accuracy. Microcontroller (ATmega16) is used as main control unit where its ADC ports are used to interface the Sensor unit and ULN2000A motor driver is used to interface the stepper motor to rotate the solar panel at maximum solar energy angle. The results found from the simulation and analysis shows that, the system required 12.04 mA and 37.163 mA current, and 144.48 mW and 445.956 mW power, during standby and panel rotating mode respectively. The maximum current drawn by the Solar Tracking Sensor is less than 0.5 mA. ‘Proteus ISIS 7.7 professional’ is used for design and simulation, and ‘Code Vision AVR v2.5’ is used to write the program code and burning into the ATmega16 for simulation and analysis.

Third-party security apps are an integral part of the Android app ecosystem. Many users install them as an extra layer of protection for their devices. By installing security apps, the smartphone users place a significant amount of trust on them allowing access to many smartphone resources that contain personal information such as the storage, text messages, email, and browser history. As such, it is essential to understand the mobile security apps ecosystem. In this paper, we present the first empirical study of Android security apps. We analyse 100 Android security apps from multiple aspects and offer insights to their operations and behaviours. Our results show that 20% of the security apps resell the data they collect to third parties; in some cases, even without the user consent. Also, we show that around 50% of the security apps fail to identify known malware.

This article presents a 3.5 GHz rectangular microstrip patch antenna (RMPA) designed, studied, and analyzed for wireless LAN applications. Using Fr-4 as substrate material, whose dielectric permittivity is 4.3, patch thickness is 1.65 mm, and loss tangent is 0.025. A feeding line with an impedance of 50 Ω is utilized to supply the antenna with power. Computer simulation technology (CST) software has been used to design the antenna and origin pro software has been used to display the resulting figures from the simulation. The antenna simulation showed that the return loss is -56.82 dB; the directivity gain is 6.02 dBi, the bandwidth is 0.148 GHz, and the voltage standing wave ratio (VSWR) is 1.0028. The paper aims to increase the return loss, develop a standard VSWR, increase the directivity gain of the antenna, and improve the antenna bandwidth. The results of the proposed antenna were much better than previously published papers, which were suitable for wireless applications. This proposed antenna can be used for future wireless LAN applications.