Abstract:
This thesis presented the thin-film antenna for wireless communications.The substrate is a black carbon car film. The dielectric constant (Ɛr) was 3.2, the loss tangent (tanδ) was 0.016, and the thickness of the substrate was 0.056 mm.The antenna was designed by Computer Simulation Technology Microwave Studio (CST Microwave Studio) program to make the various characteristics that were analyzed, including return loss, correlation coefficient, antenna gain, far-field radiation pattern, and group delay.
The 2 ports antenna was designed on the thin film substrate. The design and analysis were performed by using the coplanar waveguide for both ports, with the rectangular-shaped patch antenna.The dimensions were 64 x 27 mm2. The 3 ports antenna was developed by adding a circular patch antenna that used a coplanar waveguide.The dimensions were equal to 64 x 70 mm2.
According to the results of the 2 ports thin film antenna, a return loss was lower than -10 dB. S11 and S22 were in the range of 3 12 GHz, correlation coefficient was less than 0.5, and a group delay of less than 1.5 ns. The average antenna gain was 4 dBi. For the 3 ports thin film antenna, it was found that a return loss of S11 was in the range of 1.77 17.39 GHz and S22 and S33 were in the range of 1.63 17.22 GHz, a correlation coefficient was less than 0.5, and a group delay was less than 1.5 ns with a maximum gain of 5 dBi. Both antennas had a transmission coefficient of less than -15 dB. It had a far-field radiation pattern, an omni-directional, and bi-directional. From the test results, these antennas can be applied to wireless communications in various systems such as WLAN, WPAN, WBAN, UWB, and WiMAX.