Tight-coupled microstrip hairpin bandpass filter

The paper depicts a microstrip hairpin bandpass filter design, simulation, fabrication and test. The proposed microstrip filter's design is comprised of five hairpin structures separated by a tenth of a mm distance for which various parametric studies have been conducted. The simplicity of design provides inexpensive and undemanding filter. The filter is fabricated with suitable parametric results. The design is based on Chebyshev's values for the prototype, with N (the order of filter) number being equivalent to five. The final fabricated version of the project is based upon FR4 dielectric substrate with the input return loss being below -10 dB and insertion loss above – 2 dB. Approximate values of the input reflection coefficient and insertion loss are -33.34 dB and -1.72 dB respectively. Furthermore, the frequency range for the proposed geometry is between approximately 2.6 GHz and 3.6 GHz. The proposed filter is fabricated and the results measured in real life are highly correlated to the results simulated in the software. The proposed microstrip hairpin bandpass filter can be utilized in wireless internet access and communication.

Survey on IOT Based Medical Box for Elderly People

While the health care society is slow to embrace IOT (Internet of Things) than other sectors, IOT is intended to keep people safe and secure in the field of medicine, where the primary goal is to minimize health care costs in the coming years. A smart IOT-based healthcare system, which includes a sensor-associated intelligence medicine box and a server for routine health monitoring, has been proposed here. This wireless internet access smart medicine box allows patients to get daily health care and to establish easy contact without physically meeting between doctor and patient. The recommended medicinebox allows the patient to take the correct medicine at the right time, along with an email to help the patient take the medicine. A laptop is used as a server where, along with prescription and appointment date, accurate information about the doctor and patient is kept. The doctor and the patient both have IDs and passwords to access the server. In addition, the drug data and patient temperature are kept on the server for the convenience of the doctor. The doctor can if necessary, change the patient's prescription, which will also be notified by email. In addition, in the event of an emergency, the doctor should take immediate action

WiFi-Friendly Building to Enable WiFi Signal Indoor

The 802.11 networks (wireless fidelity (WiFi) networks) have been the main wireless internet access infrastructure within houses and buildings. Besides access point placement, building architectures contribute to the WiFi signal spreading. Even dough WiFi installation in buildings becomes prevalent; the building architectures still do not take WiFi-friendliness into considerations. Current research on building and WiFi are on access point location, location based service and home automation. In fact, the more friendly the building to WiFi signal, the more efficient the 802.11 based wireless infrastructure. This paper introduces the term of WiFi-friendly building by considering signal propagations, the obstacle impact, as well as proposing an ornament-attaced reflector and a hole-in-the-wall structure to improve WiFi signal distribution. Experiment results show that obstacle materials made of concrete reducing WiFi signal the most, followed by metal and wood. Reflecting materials are able to improve the received signal level, for instance, the implemented ornament-attached reflector is able improving the received signal up to 6.56 dBm. Further, the hole-in-the-wall structure is successfully increasing WiFi signal up to 2.3 dBm.

Ultra-Wideband Massive MIMO Communications Using Multi-mode Antennas

An ultra-wideband system design is presented which supports wireless internet access and similar short-range applications with data rates of the order of 100 Gbps. Unlike concurrent work exploring the 60 GHz regime and beyond for this purpose, our focus is on the 6.0 –8.5 GHz frequency band. Hence, a bandwidth efficiency of about 50 bps/Hz is necessary. This sophisticated goal is targeted by employing two key enabling techniques: massive MIMO communications in conjunction with multi-mode antennas. This concept is suitable both for small-scale terminals like smartphones, as well as for powerful access points. Compared to millimeter wave and THz band communications, the 6.0 –8.5 GHz frequency band offers more robustness in NLOS scenarios and is more mature with respect to system components.

Economics and computer science of a radio spectrum reallocation

The recent “incentive auction” of the US Federal Communications Commission was the first auction to reallocate radio frequencies between two different kinds of uses: from broadcast television to wireless Internet access. The design challenge was not just to choose market rules to govern a fixed set of potential trades but also, to determine the broadcasters’ property rights, the goods to be exchanged, the quantities to be traded, the computational procedures, and even some of the performance objectives. An essential and unusual challenge was to make the auction simple enough for human participants while still ensuring that the computations would be tractable and capable of delivering nearly efficient outcomes.

Understanding Operations of Floating Schools: A Case of Shidhulai Swanirvar Sangstha in Bangladesh

Bangladesh is highly vulnerable to the effects of climate change since it is a delta formed by the confluence of major rivers. Making sure that schools are resilient against such natural disasters in Bangladesh should be a priority for any disaster risk reduction preparedness and planning. To address this challenge, Shidhulai Swanirvar Sangstha (SSS) found an innovative way to deliver information and primary education to residents of wetland area in Bangladesh. It operates 111-vessel fleet of floating schools, libraries, health clinics and training centres, equipped with wireless Internet access, serving over 1,00,000 families. This case captures a clear picture of this rapidly growing non-governmental organization (NGO) of Shidhulai and its extensive activities leading to the transformation of the region’s waterways into pathways for education, information and technology in Bangladesh. Although the case partly focuses upon the role of NGOs and the operational concept of floating schools across the world, an examination of SSS’s growth, challenges, current and plans ahead strategies is the main emphasis here. All these discussions ultimately pave a clear way as to which steps the NGO could take to strengthen its position, and support the development of socio-economic infrastructure of Bangladesh.

Development of Remote Access and Control Features for Digital Signal Processing Laboratory Experimentations

Remote instrumentation and collaborative learning methods have enhanced the experimental learning aspects of engineering education. Automation is changing the nature of these laboratories and remote access techniques are providing access to server machine from anywhere in the world through internet. This provides an opportunity to develop the remote instrumentation laboratories using which students can perform their lab experiments remotely all over the day and thereby increasing the productivity of the lab setups and measuring instruments. This paper presents the detailed architecture and the implementation details of remote DSP lab instrumentation. LabVIEW user interface is developed to control all the test instruments and their related hardware interfaces. Radmin tool is used as remote access tool to integrate multiple clients to server machine through wired/wireless internet access. Hardware interface is designed and developed to route data and control signals from data acquisition card to the respective hardware and to control the test instruments.