1,721,077 research outputs found
Educational Antenna Traning Set for Radiation Pattern Plotting and Analysis Using Basic Antenna Shapes
No full textAzremi Abdullah Al-Hadi and his team from School of Computer & Communication Engineering won silver for Educational Antenna Traning Set for Radiation Pattern Plotting and Analysis Using Basic Antenna Shapes. ITEX 2007, 18th - 20th May 2007 was held at Kuala Lumpur Convention Centre (KLCC), Kuala Lumpur.A set of 17 antennas which are designed using different concepts are implemented on low profile microstrip patch antennas
Frequency agile with ultra wideband receiver fornt end
No full textAccess is limited to UniMAP community.Ultra wideband receiver front end is designed in this thesis. To determine the most
appropriate design for ultra wideband (UWB) receiver front-end, a study was conducted on the designs of wideband antennas, wideband filter and power amplifier. This work is to integrate wideband antenna, filter and amplifier that were designed separately into complete UWB receiver front-end. The preferred designs for the integration are microstrip single patch for antenna, multiple-mode resonator (MMR) for filter and power amplifier for amplifier. Setup and simulation of the antenna and filter is performed using Agilent ADS Momentum while the amplifier module are performed using Agilent ADS Schematic. The microstrip single patch antenna archives partial wideband capability with return loss below -10 dB between 6.156 GHz
and 10.25 GHz. The MMR bandpass filter simulation realizes almost maximally flat insertion loss response at -2 dB for 3.5 GHz until 8.2 GHz and the return loss is below -15 dB throughout the passband. The power amplifier module demonstrates the gain at 3.661 dB for 5.7 GHz
Impedance characterization of mobile terminal in the presence of human
No full textAccess is limited to UniMAP community.In this project, a dual band planar inverted F antenna (PIFA) is designed. The
operational frequencies are 900 MHz (lower band) and 1800 MHz (high band). The PIFA
was also measured using realistic casing to represent the real antenna in a mobile phone. The impedance of the simulation model has been verified with a prototype. It is shown that the proposed design can be used for applications in mobile terminal. The performance of the proposed antenna has been evaluated in the presence of hand. The Computer Aided Design (CAD) tool that has been used for this project is Computer Simulation Technology (CST) Microwave Studio Suite. The measurement result fulfills the requirements for an efficient antenna by ensuring that the proposed antenna has S11 (reflection coefficient) of less than -6dB. The performances analyzed in terms of the reflection coefficient (S11 parameter), input impedance matching and radiation pattern.VEE Pro has been used as the graphical language environment for recording the impedance characteristics of the mobile terminal. The software has been used to analyze the measurement results in order to predict the frequency detuning due to the presence of human, both at low and high frequencies. Therefore, general understanding on this issue will help to improve the design of the antenna for future mobile terminal
Fabrication and analysis of Microstrip bandpass filter for wireless LAN
No full textAccess is limited to UniMAP community.This project presents the design of two types of bandpass filters parallel-coupled
bandpass filter and hairpin filter. The filter is designed for a center frequency of
2.44 GHz with 100MHz operating bandwidth. The design process included creating a lumped element prototype, which was transformed into the parallel coupled and
hairpin microstrip form after verification by simulation. After both of the filters
were also design and verified by using Advanced Design System (ADS), the fabrication of the filter began on ROGER 4003C substrate. The fabricated filters
were analyzed using a network analyzer for testing. The design procedure, simulated results and measured results are discussed in the remaining part of the report
Smart direction finding for WLAN antenna using the DSP board
No full textNowadays digital signal processing (DSP) plays an important role in science and engineering because of the widespread use of computers to process, manipulate and store data. This paper describes about the smart direction finding for WLAN antenna using the DSP Board. It describes a microstep driving method of stepper motor and its DSP-based implementation to analyze the received data by using C programming. Both hardware and software were used in this project. A simple receiver antenna which is an Inset Fed Rectangular Patch Antenna is designed to operate in 802.11-b wireless local area network (WLAN) applications which are (2.40–2.48 GHz). The DSP board will control the movement of the receiver antenna to do the rotation to left or right so that the DSP board can detect at which angle the receiver will receive the strongest signal from the transmitter antenna. The VEE will read the signal received by the receiver antenna from the Network Analyzer for each rotation and then store it to the DSP board. After completing the rotation, the DSP board will analyze all the data and automatically control the receiver antenna to move to the angle that gives it the strongest signal (maximum power) in the wireless frequency range
Electrically small mimo antenna for 4G/LTE terminal
No full textAccess is limited to UniMAP community.One of the advantages of Multiple-Input Multiple-Output (MIMO) system is the significant
increase in data rate compared to the single antenna version. Implementation of multiple antenna structure requires considerable amount of space, by taking into account coupling between the antennas. Therefore, antennas should be small (compared to wavelength) and strategically placed on the terminal ground plane to avoid high mutual coupling. The aim of this project is to design and fabricate an antennas with low mutual coupling for 4G/LTE mobile terminal. The operational
frequencies at low band and high bands are 698-960 MHz and 1710-2690 MHz, respectively. It is
expected that the proposed antenna solution can meet the specification of 4G/LTE antennas to
support a vast range of capabilities of the future wireless communication networks. The project
brings the opportunity to progressively familiar with the latest antenna engineering for mobile
terminals, understand some practical industry constraints, and also discuss and imagine the basic
concepts of next generation systems
WLAN propagation study in UniMAP using microstrip patch antenna
No full textAccess is limited to UniMAP community.The advantages of microstrip antennas have made them a perfect candidate for use in the
wireless local area network (WLAN) applications. Though bound by certain
disadvantages, microstrip patch antennas can be tailored so they can be used in the new
high-speed broadband WLAN systems. This project concentrates on manufacture of
broadband microstrip patch antennas for the 2.45 GHz ISM band and possible implementation using adhesive copper tape in research scenarios. In the course of the
project, two broadband microstrip patch antennas were manufactured to adequately cover the 2.4- 2.5 GHz frequency band. A test procedure was also devised to compare the area coverage mappings, in term of path loss, of the in-house built antennas to the commercial broadband antennas. The testing show, the in-house antennas demonstrate larger bandwidth response compared to the commercial product but commercial product has a larger bandwidth and illustrate a better coverage
Design, analysis and fabrication of Fractal Antenna for multiband application
No full textA fractal is a recursively generated object having a fractional dimension. Many objects, including antennas, can be designed using the recursive nature of a fractal. There is a various type of fractal antenna. In this project, have two type of fractal antenna, which are Hexagonal Fractal Loop Antenna and Sierpinski Carpet Square Fractal Antenna. Both of these antennas will be designing using ADS Software (Advanced Design Technologies) by Agilent Technologies. This work is an attempt to model, simulate and fabricate two types of microstrip fractal antenna for multi band applications. Simulations are done using Advanced Design Technologies software. The ADS simulated results are compared with its corresponding measurements of fabricated hardware. Fabrication of antenna is done using wet-etching method, on FR-4 dielectric. The unique properties of fractals have been exploited in order to develop a new class of antenna-element designs that are multi-band and or compact in size
Efficiency measurements of small antennas using Wheeler Cap method and Directivity/Gain method
No full textAccess is limited to UniMAP community.The project undertaken was to measure the efficiency of small antennas. There are two kind of method used to measure the efficiency of the small antennas such as “Wheeler Cap” method and “Directivity/Gain” method. Each of these methods is to measure the efficiency for different kind of antennas. Several kind of small antennas were designed. They are monopole antenna, monopole antenna with 20 Ω resistor, monopole antenna with 3dB attenuator and microstrip square patch antenna. The small antennas were designed to
operate at 2.45GHz. The efficiency of these antennas was measured using above methods
mentioned and the results for each method were compared
An investigation of Rayleigh distribution in reverberation chamber
No full textLink to publisher's homepage at http://ieeexplore.ieee.orgAmplitude fluctuations in signals received over mobile radio channels are typically modeled by a Rayleigh distribution. The field statistics in the volume of the enclosure are shown to correspond to the Rayleigh statistics found in properly functioning reverberation chambers when a sufficiently large number of modes is excited. This paper gives an investigation of statistical characteristics in Rayleigh communications channels by using reverberation chamber. Scattering parameters taken from measurement of antenna radiation efficiency using reverberation chamber is implemented into Rayleigh probability density function (PDF) model and it really shows that they are in good agreement with those of theoretically predicted Rayleigh model
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