Sub-Terahertz: generation and detection

Nowadays, there has been an increasing interest in Terahertz (THz) radiation for application across scientific disciplines including atmospheric sensing, medical diagnosis, security screening and explosive detection. The limitation of THz generators and detectors has gained interest from scientists and engineers to explore the development of both sources and detectors. With the advantages of low cost, low power consumption, high reliability and potential for large-scale integration, sub-THz generator and detector can be developed using CMOS process technology. In this thesis, an IMPATT diode acts as a sub-THz generator, HEMTs and MOSFETs act as sub-THz detectors, which are developed in AMS 0.35 μm CMOS technology and UMC, 0.18 μm CMOS technology. The size of the IMPATT diode was 120 μm x 50 μm with the target resonant frequency at 30 GHz. The experiment results show that the operating frequency of the IMPATT diode was between 12 GHz up to 14 GHz. Then by using HEMTs with 0.2 μm gate length and 200 μm gate widths, sub-THz radiation detection has been demonstrated. Experimental results show that the photoresponse depends on the drain current and the gate to source voltage VGS. In addition, photoresponse also depends on varying frequencies up to 220 GHz and fixed the drain current. Furthermore, the HEMT also give an indication of response by varying the input power of microwave extender. MOSFETs from two types of CMOS technology; AMS 0.35μm and UMC 0.18 μm technology with different gate length ranging from 180 nm up 350 nm were demonstrated. These results provide evidence that the photoresponse increases with the drain current and the RF input power, but inversely to the frequencies. These results also provide evidence that the MOSFETs are able to work as low cost and sensitive sub-THz detector

220GHz detection using 035 uM AMS mosfet as sub-THz detector Drain bias detraction

In this paper we present the detection of sub-THz radiation at 220 GHz by using 0.35 μm AMS Metal Oxide Semiconductor Field Effect Transistor (MOSFET). The design procedure and experimental setup are shown in order to design and characterize the MOSFETs photoresponse. The experiment and observation of photoresponse are measured against gate voltage with a drain current bias detraction at room temperature. The measured photoresponse is a superposition of a generally increasing response with a decrease in V cs coupled with a small peak approximately at threshold and there is evidence that the MOSFET can be a sensitive sub-THz detector in the room temperature

Sub-Terahertz: generation and detection

Nowadays, there has been an increasing interest in Terahertz (THz) radiation for application across scientific disciplines including atmospheric sensing, medical diagnosis, security screening and explosive detection. The limitation of THz generators and detectors has gained interest from scientists and engineers to explore the development of both sources and detectors. With the advantages of low cost, low power consumption, high reliability and potential for large-scale integration, sub-THz generator and detector can be developed using CMOS process technology. In this thesis, an IMPATT diode acts as a sub-THz generator, HEMTs and MOSFETs act as sub-THz detectors, which are developed in AMS 0.35 μm CMOS technology and UMC, 0.18 μm CMOS technology. The size of the IMPATT diode was 120 μm x 50 μm with the target resonant frequency at 30 GHz. The experiment results show that the operating frequency of the IMPATT diode was between 12 GHz up to 14 GHz. Then by using HEMTs with 0.2 μm gate length and 200 μm gate widths, sub-THz radiation detection has been demonstrated. Experimental results show that the photoresponse depends on the drain current and the gate to source voltage VGS. In addition, photoresponse also depends on varying frequencies up to 220 GHz and fixed the drain current. Furthermore, the HEMT also give an indication of response by varying the input power of microwave extender. MOSFETs from two types of CMOS technology; AMS 0.35μm and UMC 0.18 μm technology with different gate length ranging from 180 nm up 350 nm were demonstrated. These results provide evidence that the photoresponse increases with the drain current and the RF input power, but inversely to the frequencies. These results also provide evidence that the MOSFETs are able to work as low cost and sensitive sub-THz detector

Wireless Network Visualization in 3D Virtual Environment Framework

Simulating a signal propagation of wireless cognitive network has been widely accepted by researchers in order to come out with three-dimensional (3D) representation data display. Instead of using primitive way to understand the behavior of signal propagation, 3D visualization of wireless networking could also help researchers to study the limitation and exploration of wireless cognitive network deeply. In this paper, we would like to address the requirement and the potential of using 3D representation to visualize properly the wireless cognitive network. We also performed preliminary test of our 3D visualization system using OpenGL graphic library to visualize the propagation of signal travelling in specific room with several medium. The test has been conducted in order to understand the requirement of wireless cognitive network in 3D visualization before the actual system is built

The Characteristics of Users in the Adoption of Low Loss Microwave Transmission Glass: A Conceptual Paper

AbstractThis paper aims to examine the relationship between users’ characteristics towards adopting the LLMTG. These relations were found correlated in its intention to adopt this type of glass in building structures. Despite the indication provided by numerous empirical studies, the organizations that adopt the LLMTG will gain more competitive advantage and improvement. It is strongly believed that this attempt would contribute both to knowledge of the diffusion of innovation and to implications for practice by assisting the industry to understand the important factors when adopting innovation. Rich data will be collected using questionnaire among managers from all industrial in Malaysia

Wireless based Smart Parking System using Zigbee

One of main issues of developing big parking space for shopping complexes, office complexes and other types of building that requires large parking space is to notify the visitors of occupied and nonoccupied parking space. Most of the visitors might spending up to 30 to 45 minutes just to find an empty parking space. In most recent technology, some parking lot system offered a system that could automatically count when the car entering the empty car space and blocking an infrared signal thus notify the system to count for it. However, this type of sensors actually has an increase of budgeting in order to install and to be maintained. In this project, we have developed a unique solution by providing cost effective solution by using Zigbee technology in parking lot system technology. Instead of using and maintain cable that need to be installed at the ceiling of the parking lot, we developed a system that use wireless technology of Zigbee and it could notify the visitors of empty and non-empty parking lot

Social Networking as Support Tool for Online Teaching and Learning Factors and Contributions

Creating a good and stylish online learning for education is always bringing a good response to student especially for long-distance learning. The outcome is clear; which is to expand the capability of online education for all people around the globe by giving them a chance to study wherever they live and work as long they have good Internet access. Immersive learning as we all know consisting of the virtual reality aspect that bring educator and learner closer without having them to leave their place in order to gain knowledge and further their study. This paper studied the requirement to perform immersive learning while characterizing each challenge that we must face to perform a good online learning. We also numbered few technologies that could benefits the online learning either through website or online video conferencing

A REVIEW OF FIREFLY ALGORITHM

ABSTRACT Firefly algorithm is one of the swarm intelligence that evolve fast for almost area of optimization and engineering problems. Stand alone firefly algorithm already has managed to solve problems. For problems that have multi dimensional and nonlinear problem, some modification or even hybridization with the other metaheuristic is advisable. This modification and hybridization is to aim for help for the computational constrain and it will become more flexible and more efficient

SHOPPING TROLLEY TRACKING SYSTEM VIA SMS USING ULTRA HIGH FREQUENCY APPLICATION

This paper presents the function of Application Radio Frequency In Keeping Track Shopping Trolley Using GSM. The objective of develop this project is to create a solution that can help the shopping management that provide trolleys services for the costumers or users to reduce cost to their company arising from the missing trolleys and frequently considered stolen This system consists of receiver and transmitter, and technically this device uses radio frequency wave concept to operate. If one of the trolleys is out of range, turn on a buzzer and a red light at the same time at control room than using GSM will sent Short Message Service (SMS) to guard. This capability provides ease and safety to safety guard, to monitor the trolleys frequently used by costumers or users. The operating frequency used by the transmitter is about 100MHz to 2.45GHz which the receiver can detect accurately within 10 to 100 meters; even through a protective casing is covering the transmitters. This covering is also use to avoid the users damaging the transmitters and to provide protection to the assembly. This is to ensure the trolley always in range