Author:
Gökmen IŞIK
Year:
2012
Abstract:
In this thesis, ultra wide band antenna is designed and realized. To overcome the narrow band characteristics of patch antenna, the structure of the radiation is designed with elliptical and rectangular patch. Also triangular patches are used edge of the antenna to enhance the VSWR and gain. In addition, presented antenna ground plane is consisting of rectangular and elliptical patch which is modified with a small segment of arc at the middle.Antenna performance is specified in terms of system gain not only at azimuth, but also at low elevation angles, and the Voltage standing wave ratio (VSWR) over a prescribed frequency band. Numerical simulation show that the antenna has a bandwith ratio of 5:1 within the frequency range of 4-19.1 GHz with compact dimensions of 25 x 26 mm^2. It is printed on substrate having 0.5 mm thickness. However, measured values were slightly higher than the simulated ones in a small frequency range. Even with that discrepancy, ultra wide band antenna performance is observed. Since we did not have the ability to measure system gain, we relied on simulated values which were higher than 0dBi over the target frequency band.