Wide-band antenna design and implementation for small-size RF anechoic chambers

In this thesis work; wideband microstrip planar monopole antennas consisting of two different types and a microstrip log periodic dipole array antenna are designed and fabricated for wireless communication systems, which are frequently used nowadays. The return loss performances of the antennas within the desired operating frequency bandwidth of 750 MHz to 3000 MHz are almost kept above about 10 dB by using circular disc in the first monopole antenna, and using step cut at four corners method to the radiated surface with T-shape slot at the ground surface of the rectangular patch in the second monopole. Then, a log periodic dipole array antenna is designed to operate at wideband by the help of the standard formulations for log periodic array. In this way, these antennas become convenient for the systems of Global System for Mobile Communication (900 MHz), Global Positioning System (1227 MHz, 1575 MHz), Third Generation of Mobile Telecommunications Technology (2100 MHz), Wireless Fidelity (2400 MHz) and Long Term Evolution (2600 MHz). Besides, these antennas are designed according to the dimensions of a small-size anechoic chamber at the Antenna and Microwave Technique Laboratory of Dokuz Eylül University which is a setup in order to measure the performances of the antennas and systems within the described frequency bandwidth, and they are considered to be used in this chamber. Finally, a Koch Fractal log periodic dipole array antenna is designed, simulated and manufactured.