This research proposed microstrip circular patch antenna simulation at a working frequency 3500 MHz. The antenna has been designed using a Duroid RT5880 substrate with dielectric constant (εr) = 2.2, substrate thickness (h) = 1.575 mm, and tangent loss = 0.0009 with microstrip line feeding. The simulation result, return loss value obtained -26.385, VSWR value 1.09, gain value 7.64 dBi, total radiation efficiency value -0.6489 dB, and bandwidth value 72 MHz (3468.8 MHz – 3541.9 MHz).
Makalah ini membahas tentang pemberian pakan ikan yang dilakukan secara otomatis dengan mikrokontroler arduino uno. Pemberian dilakukan dengan pengaturan waktu serta pemberitahuan status melalui pesan singkat atau SMS sebagai indikator untuk memonitor dari jarak jauh. Indikator lainnya adalah LCD, LED, dan Buzzer Metode pemberian pakan dikerjakan dengan jadwal yang telah ditentukan sesuai dengan perkembangan berat ikan. Alat pakan otomatis ini dapat mendeteksi bahwa pakan telah habis dengan menggunakan sensor LDR. Hasil penelitian menunjukkan bahwa pakan ikan otomatis ini mampu menampung pakan pada wadahnya sebanyak 3kg serta pengeluaran pakan yang mempunyai kesalahan atau error 0%. Dapat mendeteksi pakan habis oleh sensor LDR apabila sisa pakan ikan tersisa sebanyak 20,5gram.
This research purposed the design of rectenna that it can convert the electromagnetic field source into the DC voltage output. The research is conducted in two steps, simulation and fabrication of antennas, and rectifier circuits. This research applies CST Studio Suite software to simulate the antenna and NI Multisim 14.0 to simulate the rectifier. The antenna has been designed and fabricated by utilizing the array antenna of the circular patch microstrip with adding of the insertion feeder with 7 mm of length and 1 mm of width to reach of the matching antenna. The rectifier has been created by using BAT 85 DO-35 Schottky diode where it can work at high frequency. The measurement result of the antenna is minimum with the return loss amount of 33.783686 dB, bandwidth is 100 MHz, and VSWR (Voltage Standing Wave Ratio) is 1.021669. The rectenna can receive a maximum voltage of 11 mV at a range of 1cm.
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