Dual Frequency Circular Shaped Two Port MIMO Antenna
Design and Development of Portable Oxygen Concentrator
Design and Simulation of Antenna for Foliage Penetration Application
Performance Enhancement of Microstrip Patch Antenna with Slots for 5G Communication
Ergonomic Wheelchair - Stretcher for Enhanced Patient Mobility
The Impact of Substrate Doping Concentration on Electrical Characteristics of 45nm Nmos Device
A Study on Globally Asynchronous and locally Synchronous System
Method of 2.5 V RGMII Interface I/O Duty Cycle and Delay Skew Enhancement
Performance Analysis of Modified Source Junctionless Fully Depleted Silicon-on-Insulator MOSFET
Automatic Accident Detection and Tracking of Vehicles by Using MEMS
Efficient Image Compression Algorithms Using Evolved Wavelets
Computer Modeling and Simulation of Ultrasonic Signal Processing and Measurements
Effect of Nano-Coatings on Waste-to-Energy (WTE) plant : A Review
ANFIS Controlled Solar Pumping System
Dual Frequency Circular Shaped Two Port MIMO Antenna
A small-sized, circular-shaped Multiple Input Multiple Output (MIMO) antenna is investigated in this study. This antenna is suitable for wireless applications at 2.4 GHz and 5 GHz. The MIMO antenna comprises two identical, back-to-back slotted circular patch antennas with a common ground plane. The radiation direction of each antenna is oriented at 180° relative to its counterpart, providing good isolation between them. The novelty of this two-port MIMO antenna lies in its compact size of only 0.001λ03(where λ0 corresponds to the free space wavelength at 2.4 GHz) along with its dual-band operating capability. Important parameter values of this MIMO antenna are analyzed using electromagnetic analysis software. Directivity values of 5.5 dBi (at 2.4 GHz) and 6.7 dBi (at 5 GHz), as well as reasonable bandwidths of 50 MHz (at 2.4 GHz) and 160 MHz (at 5 GHz), are obtained for this antenna. Envelope Correlation Coefficients (ECC) of 0.01 at 2.4 GHz and 0.003 at 5 GHz, along with a nearly 10 dB Diversity Gain (DG), are achieved at both frequencies for this compact antenna system. The ratio of Mean Effective Gain (MEG) between the two antennas is found to be 0.02 dB at 2.4 GHz and 0.05 dB at 5 GHz. Channel Capacity Loss (CCL) values of 0.16 bits/s/Hz and 0.089 bits/s/Hz are obtained at 2.4 GHz and 5 GHz, respectively. The characteristic parameters of this two-port circular patch antenna system are compared with those of similar antennas reported in recent literature.
Pakistan lacks domestic manufacturing of medical devices, and recent inflation alongside rupee devaluation has driven up the prices of imported medical devices. The supply and demand crisis for supplemental oxygen during the COVID-19 pandemic underscored the importance of portable oxygen concentrators, as oxygen is essential for all physiological functions. This initiative applied reverse-engineering to design and develop a prototype portable oxygen concentrator using pressure swing adsorption technology, with integrated sensors and enhanced filters for improved efficiency and effectiveness. The prototype underwent various tests to verify that it met the intended objectives. This effort aimed to initiate local, cost-effective manufacturing of oxygen concentrators in Pakistan, contributing towards the United Nations Sustainable Development Goal 9, Industry, Innovation, and Infrastructure.
The foliage penetration radar system operates in the VHF/UHF range of the electromagnetic spectrum, allowing for greater radio frequency penetration compared to microwave frequencies while providing improved range and significant cross-range resolution. The multi-static ground-based foliage penetration radar comprises a transmitting and a receiving antenna. The unidirectional radiating transmitting antenna utilizes a VHF wideband transmitting signal, achieving fine localization accuracy over a larger coverage area while effectively penetrating foliage. However, achieving significant antenna gain or directivity while maintaining an acceptable size at VHF/UHF frequencies presents challenges. This paper focuses on the design and simulation of an antenna tailored for foliage penetration applications, emphasizing the balance between size and directivity.
The demand for high-performance antennas tailored for 5G applications has stimulated research into novel designs and optimization techniques. This study focuses on the design, development, and optimization of microstrip patch antennas (MPAs) integrated with slots to enhance their performance in 5G communication systems. Various slot configurations, including rectangular and T-shaped slots, are incorporated into the ground plane of the patch antennas to investigate their impact on antenna characteristics such as gain, bandwidth, and radiation pattern. Simulation results demonstrate that the introduction of slots effectively increases the antenna's effective aperture, modifies current distribution, and enhances radiation efficiency. Furthermore, the strategic placement of slots improves antenna directivity and suppresses surface waves, leading to a notable improvement in antenna gain. Experimental validation corroborates the simulation findings, showcasing the practical feasibility and efficiency of the proposed slot-integrated antenna designs. Overall, this research contributes to the advancement of antenna technology tailored for the evolving requirements of 5G communication systems.
This study addresses the challenges faced by individuals with physical disabilities in manually operating wheelchairs. To enhance mobility and ease of use, a mechanism combining the functionalities of a stretcher and a wheelchair has been developed. The wheelchair-to-stretcher conversion utilizes a straightforward mechanical mechanism with a focus on ergonomic design and adherence to safety standards. The system is managed by an Arduino microcontroller, which connects to an ultrasonic sensor for obstacle detection and transmits data to a mobile application through an Internet of Things (IoT) module (Node MCU). This dual-purpose design facilitates medical personnel in seamlessly transferring patients from chairs to beds, with the adjustable height feature allowing the chair to function effectively as a stretcher.