Asli Eda Aydemir
Electromagnetics, Antennas and Microwaves
Development Of K Band Microstrip Patch Antenna Array For Traffic Radars
Together with the improving technology, automotive engineering is improving as in all engineering areas. In parallel with these developments, maximum speeds that can be reached by vehicles increase also day by day. Irresponsible usage of high-speed vehicles puts human life in danger. To prevent from this danger, the speeds of vehicles need to be monitored and both drivers and police officers should be informed. Detection capabilities of traffic radars are developing to catch up with the automotive technology. Antennas are the primary hardware on traffic radars for detection. It is important for these antennas to be small and high-performance in terms of applicability. Microstrip patch antenna arrays are widely used in traffic radar applications due to their improved characteristics. In this thesis work, two microstrip patch antenna arrays are designed for the traffic radar applications. Both of them operate at the 24.125 GHz with 250 MHz bandwidth. Two different series feed networks are used, namely shunt connected series feed network and in line coupled series feed network. The one with shunt connected series feed network is manufactured and measured to make comparisons with the simulation results. In the end, it is observed that simulation and measurement results are very similar. 7 degree beamwidth is achieved in both azimuth and elevation planes as well as less than -14 dB side lobe levels at the radiation patterns. In the second design 30 degree and 12 degree beamwidths are achieved for azimuth and elevation planes respectively. While the side lobe level of the azimuth plane is smaller than -15 dB; in the elevation plane, the side lobe level is minimized up to -12 dB due to the existence of meandered transmission lines.
Prof. Dr. Ozlem Aydin Civi