การเพิ่มสมรรถภาพของสายอากาศแบบร่องด้วยวัสดุเมตาสำหรับการสื่อสารไร้สายสมัยใหม่

Abstract

This thesis presents a study of performance improvement of microstrip slot antenna, which was a resonance property of microstrip antenna. As a result, the antenna was limited in term of narrow bandwidth and low gain. Therefore, it was enhanced by adding a groove on the microstrip antenna or a slot antenna to expand the bandwidth to be wider supporting the modern wireless communication technology such as IoT (LTE), WLAN (IEEE Std 802.11), WiMax (IEEE Std 802.16), and GSM technologies such 1.80 GHz, 1.90 GHz, 2.10 GHz, and 2.60 GHz. In addition, increasing the gain and overall performance of the antenna had been improved slot antenna properties that were metamaterial, including metallic holes and wire medium structures. Moreover, both structures influenced electromagnetic waves, so it found that a suitable structure would control characteristics of the antenna. It can control the radiation pattern, decreasing the backlobe level and increasing the gain of antenna. Furthermore, this study also presents a comparison of the results with the Perfect Electric Conductor (PEC) by simulating with electromagnetic system software to find out the results of the single slot antenna and the slot antennas with added two types of metamaterials and PEC. In this simulation, a prototype antenna was built to test measurement, compare, and conclusion of the research results.