ABSTRAKPenelitian ini mengusulkan desain antena mikrostrip array empat elemen dengan polarisasi melingkar pada frekuensi kerja 2300 MHz untuk aplikasi 4G/LTE. Antena telah dirancang dan dipabrikasi menggunakan substrat jenis FR-4 Epoxy dengan nilai konstanta dielektrik (Ɛr) = 4.3, ketebalan substrat (h) = 1.6 mm dan loss tangen (tan δ) = 0.0265 dengan pencatu microstrip line. Polarisasi melingkar dengan axial ratio ≤ 3 dB dihasilkan dengan menggunakan metode truncated corner sedangkan untuk meningkatkan nilai gain digunakan metode array empat elemen. Dari hasil proses pengukuran diperoleh nilai koefisien refleksi sebesar -16.52 dB, VSWR sebesar 1.37 pada frekuensi kerja 2300 MHz dengan bandwidth yang diperoleh dari hasil pengukuran adalah 400 MHz (2050 MHz - 2450 MHz). Metode truncated corner berhasil menghasilkan polarisasi melingkar dengan nilai axial ratio 1.745 dB dan berhasil menghasilkan nilai gain sebesar 9.04 dB pada frekuensi kerja 2300 MHz untuk aplikasi LTE.Kata kunci: Antena, mikrostrip, koefisien refleksi, array, truncated corner ABSTRACTThis research proposed a four-element microstrip array antenna design withcircular polarization at a working frequency of 2300 MHz for 4G / LTEapplications. The antenna has been designed and fabricated using a FR-4 Epoxy substrate with a dielectric constant value (Ɛr) = 4.3, substrate thickness (h) = 1.6 mm and tangent loss (tan δ) = 0.0265 with microstrip line feeding. The circular polarization with axial ratio ≤3 dB was generated using the truncated corner method while for increasing the gain value used the four element array method. From the result of the measurement process, the reflection coefficient value is obtained -16.52 dB, VSWR of 1.37 at 2300 MHz working frequency with bandwidth obtained from the measurement result is 400 MHz (2050 MHz - 2450 MHz). The truncated corner method succeeded in generating a circular polarization with the axial ratio of 1.745 dB and succeeded to obtain the gain of 9.04 dB at work frequency of 2300 MHz for LTE application. Keywords: Antena, microstrip, reflection coefficient, array, truncated corner
This paper proposes a high gain microstrip antenna with circular polarization for LTE applications at a working frequency of 2300 MHz. Gain of antenna is optimized by using an array method with 4 elements arranged in plannar using feed line of 50 Ohm, 100 Ohm and 70.7 Ohm. The proposed antenna designed using FR-4 substrate with (Ɛr) = 4.3, substrate thickness (h) of 1.6 mm and loss tangent (tan δ) of 0.0265. Gain of antenna can be optimized by increasing the number of elements in the array of the antenna. Circular polarization can be obtained by cutting the edge of a rectangular patch antenna with an angle of 45 0 . From the simulation results obtained reflection coefficient value of -20.02 dB and VSWR of 1.22 at the working frequency of 2300 MHz. The gain of proposed microstrip antenna is 10.56 dB with an impedance bandwidth value of 714 MHz (1925( -2639. The proposed antenna obtained a circular polarization with axial ratio of 1.745 dB at working frequency of 2300 MHz. Array method with four elements increased the gain of antena until 45.07% compared to the single element antenna.
Sistem hidroponik berbasis Internet of Things yang dirancang adalah sistem hidroponik yang dilengkapi perangkat untuk memantau suhu, pH dan ketinggian air melalui media internet. Perangkat keras terdiri dari sensor pH, sensor suhu, sensor ultrasonik, relay dan pompa air yang dipasang pada kit hidroponik. Arduino sebagai mikrokontroler untuk memproses data yang dihubungkan dengan modul Ethernet Shield agar dapat terhubung dengan internet, ThingSpeak sebagai platform untuk menyimpan data dari Arduino, serta Smartphone untuk menampilkan hasil dan akan digunakan untuk memantau suhu dan pH air. Dari hasil pengujian, alat ini mampu bekerja secara otomatis berdasarkan hasil pembacaan sensor dan hasilnya dapat dipantau jarak jauh melalui smartphone tanpa adanya batasan jarak selama terhubung dengan jaringan internet. Hasil pengujian pengiriman data dari Arduino Uno ke Ethernet Shield, ThingSpeak, dan aplikasi ThingView dapat berjalan baik, dengan waktu pembacaan data minimal 22 detik, maksimal 24 detik.
Abstrak -Telah berhasil dibuat film tipis Ba 0.55 Sr 0.45 TiO 3 di atas substrat Corning Glass 7059 dengan metode Chemical Solution Deposition (CSD) berbantuan spin coating berkecepatan putar 3000 rpm selama 30 detik dalam kelarutan 1 M. Film tipis di annealing pada suhu 550 o C, 575 o C, selama 22 jam. Sifat optik dilakukan dengan alat Ocean Optic USB 4000 pada rentang gelombang cahaya tampak (350-790 nm) diperoleh energi bandgap sebesar 1.888 eV dan 1.712 eV. Kata Kunci: Ba 0.55 Sr 0.45 TiO 3 , CSD, energi bandgap, film tipis Abstract -Have been successfully created a thin film Ba 0.55 Sr 0.45 TiO 3 above the substrate of Corning Glass 7059 by the method of Chemical Solution Deposition (CSD) assisted with spin coating's turning speed 3000 rpm for 30 seconds in the solubility of 1 M. Thin film was annealed at temperature of 550 o C, 575 o C for 22 hours. Optical characterization was carried out by Ocean Optic USB 4000 device on wave range Visible (350-790 nm) that was obtained the energy bandgap of 1.888 eV dan 1.712 eV.
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