Electronic Theses and Dissertation

Perkembangan teknologi komunikasi nirkabel yang pesat telah mendorong
munculnya Internet of Things (IoT) yang membutuhkan sistem komunikasi berdaya
rendah dengan jangkauan luas. Salah satu teknologi yang mendukung kebutuhan
tersebut adalah Long Range (LoRa) yang beroperasi pada pita frekuensi ISM 915
MHz. Dalam sistem LoRa, antena berperan penting untuk menentukan efisiensi dan
jangkauan komunikasi. Penelitian ini membahas perancangan antena mikrostrip
1×2 berbentuk rectangular patch array menggunakan metode inset feed untuk
aplikasi komunikasi LoRa. Metode inset feed digunakan untuk meningkatkan
pencocokan impedansi sehingga dapat memperbaiki parameter antena seperti
return loss, VSWR, gain, dan bandwidth. Proses simulasi dilakukan menggunakan
perangkat lunak CST Studio Suite 2019 dengan material substrat FR4 (εr = 4,4, h =
1,5 mm). Berdasarkan simulasi antena array dua elemen dengan inset feed berhasil
mendapatkan bandwitdth sebesar 23,66 MHz, gain sebesar 2,085 dBi, return loss
sebesar 27,77 dB, dan VSWR sebesar 1,085, sedangkan hasil pengujian antena
array dua elemen dengan inset feed berhasil mendapatkan bandwitdth sebesar
25,306 MHz, gain sebesar 2,24 dBi, return loss sebesar 19,37 dB, dan VSWR
sebesar 1,26. Hasil yang didapatkan dari simulasi sudah baik dan memenuhi
parameter yang diharapakan yaitu bandwidth ≥ 20 MHz, gain > 2 dBi, return loss

The rapid development of wireless communication technology has driven the emergence of the Internet of Things (IoT), which requires low-power communication systems with wide coverage. One of the technologies that supports these requirements is Long Range (LoRa), which operates in the 915 MHz ISM frequency band. In LoRa systems, the antenna plays an important role in determining communication efficiency and range. This study discusses the design of a 1×2 microstrip antenna in the form of a rectangular patch array using the inset feed method for LoRa communication applications. The inset feed method is used to improve impedance matching so that antenna parameters such as return loss, VSWR, gain, and bandwidth can be enhanced. The simulation processes were carried out using CST Studio Suite 2019 software with an FR4 substrate material (εr = 4.4, h = 1.5 mm). Based on the simulation results, the two-element array antenna with inset feed achieved a bandwidth of 23.66 MHz, a gain of 2.085 dBi, a return loss of 27.77 dB, and a VSWR of 1.085. Meanwhile, the measurement results of the two-element array antenna with inset feed achieved a bandwidth of 25.306 MHz, a gain of 2.24 dBi, a return loss of 19.37 dB, and a VSWR of 1.26. The simulation results are considered good and meet the expected parameters, namely bandwidth ≥ 20 MHz, gain > 2 dBi, return loss < -10 dB, and 1 < VSWR ≤ 2, which are in accordance with standard antenna requirements. The antenna design is expected to serve as a reference for the development of low-power, wide-area IoT communication systems. Keywords: Microstrip Antenna, Patch Rectangular Array, Inset Feed, Bandwidth, Gain, LoRa, 915 MHz