New wideband microstrip feeding slot antenna design and implementation

Official URL: http://risc01.sabanciuniv.edu/record=b1124920 (Table of Contents)

This thesis deals with the design and implementation of a new wideband microstrip feeding slot antenna. The increasing demand on high data rates and the increasing number of subscribers require wideband communication. Ultra Wideband (UWB) is preferable in communication systems, radar systems and positioning applications because of its unique characteristics. One of the issues of the hardware implementation of wideband communication is design and fabrication of a wideband antenna. Existing ultra-wideband antennas are not easily adapted to IC fabrication. One of the wideband antennas which satisfy these requirements is the aperture antenna. Best way of increasing impedance bandwidth of an aperture antenna is feeding with microstrip tuning stub. Shapes of the microstrip tuning stub and aperture directly affect antenna characteristics. In this thesis, four new types of microstrip feeding slot antennas are investigated. They are designed by means of computer simulations. We fabricated them using PCB production method and the radiation characteristics were measured. Experimental results are in very good agreement with theoretical calculations. The antennas were demonstrated to work in 1GHz-22GHz range with bandwidths of up to 11 GHz. They can be designed to operate at higher frequencies by changing dimensions of the tuning stub and slot and using high frequency substrate material. All antennas which are mentio ned in this thesis are wideband, low profile and adaptable to microfabrication. These antennas can be used in other wideband applications besides UWB communication applications.