Antena memiliki peranan penting sebagai penyesuai impedansi serta perangkat yang dapat menerima maupun mengirim gelombang elektromagnetik. Saat ini antena mikrostrip adalah antena yang popular digunakan untuk komunikasi bergerak karena memiliki keunggulan yaitu berdimensi kecil dan berbobot ringan dibandingkan dengan antena dipole pada umumnya. Namun, terdapat beberapa kelemahan dari antena mikrostrip yaitu bandwidth yang sempit dan gain yang rendah. Penelitian ini bertujuan untuk melakukan perancangan antena mikrostrip yang memiliki frekuensi kerja 1800 Mhz, bandwidth minimal 90 Mhz, gain minimal 3dBi, serta polarisasi yang melingkar dengan memanfaatkan akrilik sebagai substrat. Penggunaan akrilik sebagai substrat bertujuan agar antena memiliki sifat kamuflase. Akrilik yang digunakan dimodifikasi menjadi material dielektrik artifisial dengan menyisipkan strip-strip konduktor diantara subtratnya untuk meningkatkan nilai permitivitas dari host material. Dari hasil simulasi menggunakan simulator CST Studio 2018 didapatkan antena yang dirancang memiliki bandwidth 132,7 MHz, return loss 27,638 dB, VSWR 1,0866, gain 8,436 dBi, dan polarisasi melingkar dengan axial ratio mendekati 1.
The circular patch microstrip antenna is a device that supports 5G technology because it has a low profile and small dimensions. The circular patch antenna generally constructs of 3 layers of an electromagnetic material. The materials are a good conductor as the radiator and the ground plane and a natural dielectric as the substrate. Along with telecommunication developments, research in the field of antennas is significantly growing. The characteristics of the antennas must be adaptive to these telecommunication developments. One of the antenna research as the solution is an introduction to artificial electromagnetic material. Artificial dielectric is one of the artificial electromagnetic materials. As we have known, a single circular patch antenna has a narrow bandwidth (less than 5% of the center frequency) and a low return loss. This paper proposes an open-ring artificial dielectric. The proposed artificial dielectric is used to improve the bandwidth and the return loss. Furthermore, the circular patch antenna with and without the open-ring dielectric is proposed and conventional. The result shows that the proposed antenna has a wider bandwidth, 8.94%, a higher gain, 0.78 %, and a higher return loss at the center frequency, 5.25% higher than the conventional antenna. From these results, the open-ring artificial dielectric can improve the characteristics of the conventional antenna.
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