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UQ Innovation Expo 2003 ITEE Innovation Expo 2002 ITEE Innovation Expo 2001 ITEE Public Web ITEE School Alumni| UQ Innovation Expo 2003 » Mid-Year Student Projects » Foong Leng Lew |
Inverted Trapezoidal Antenna For Pulsed Application
Student: Foong Leng Lew
Supervisor: Nick Shuley
Category: Engineering Thesis Project - Communications
In the coming years, there is a great increase in demand for short range high-speed data transmissions. A new technology has been employed into our daily lives with minimal interference is known as the Ultra-Wideband or UWB. This technology is an unlicensed service that can be used anywhere, anytime, by anyone. UWB which is well known for its use in ground penetrating radar (GPR) has shown interest in communications and radar applications. Unlike traditional systems, this can only operate over a specific range of frequencies. UWB devices operate by employing a series of very short electrical pulses (billionths of a second long) that result in very wideband transmission bandwidths. In additional, UWB signals can run at high speed and low power levels. Hence, there is a need to implement these characteristics type of ultra wideband antennas.
The purpose of this thesis report is to propose an inexpensive, light-weight, compact and portable new type of ultra-wideband antenna for pulsed application. An inverted trapezoidal antenna is exclusively selected for this implementation due to its broadband characteristics. The general approach to this design is to feed the antenna by a 50 ohm coaxial cable through an image ground plane and backed by a reflector for the radiation and detection of ultra short pulses. The model is created in the form of simulation program using FEKO. FEKO software is used for antenna analysis and design which is based on The Method of Moments (MoM) algorithm.
In an attempt to achieve the best overall performance, experimental simulations results are continually assessed using different parameters, followed by constructing the prototype. The final prototype results showed relatively good results compared with its simulations. Improved simulated results are experimented for future development of this ultra-wideband antenna.