Novel Artificial Magnetic Conductor for 5G Application

A design of novel bendable Artificial Magnetic Conductor (AMC) structures has been presented in this paper in two selected of frequencies at 5G application. These designs started with a square patch shape and continued with the combination of circular and Jerusalem shape which resonate at a frequency of 18 GHz and 28 GHz. Details of the theory and the structures of AMCs are explained. The reflection phase, bandwidth, angular stability and dispersion diagram were studied. The simulated results plotted that the novel AMC has good bandwidth and size is reduced by 53 % and 55 % for both frequencies. Other than that, it is also proved that the novel AMC has a stable reflection phase and no band gap performs at the specific frequency. The good performances of this novel AMC make it useful in order to improve antenna’s performanc

Improvement Antenna Performance by using Artificial Magnetic Conductor at 28 GHz

The configurations of single patch antenna integrated with three different designs of patch artificial magnetic conductor (AMC) are presented in this paper in order to investigate the gain, radiation pattern, directivity and bandwidth of the antenna at a frequency of 28 GHz. Three cases of design configuration between patch antenna and three different designs of AMC are analyzed. First, configuration of patch antenna integrated with three designs of patch AMC. Second configuration of patch antenna integrated with non periodic patch AMC and third multilayer patch antenna with patch AMC. The details theory of the design configuration is explained. The simulated reflection coefficient and radiation pattern is presented. The simulated results showed that the gain, directivity and impedance bandwidth of all the design techniques are increased compared to patch antenna without AMC. For the first case, design of patch antenna integrated with design 1 AMC offer 13.96 % bandwidth and 12 % of the gain compared to patch antenna without AMC. In the second case, the overall size is reduced by 9.2 % and 14.14 % , respectively, compared with design in the first case. The third case of design structures provides more gain and bandwidth more than 3.57 %. In addition, the size is reduced compared to the previous two cases. Therefore, the result indicates the capability of this antenna integrated with AMC to be used for future 5G application. Index Terms: Artificia

UJI EFEKTIVITAS FLAVONOID TOTAL EKSTRAK ETANOL KULIT BATANG NANGKA PENETAPAN KADAR FOSFOR DALAM OKRA HIJAU (Abelmoschus esculentus (L.) Moench) SECARA SPEKTROFOTOMETRI SINAR TAMPAK

Green Okra is one vegetable that contains minerals is quite high. One such mineral is phosphorus, which is an essential mineral needed for growth and repair of cells in the body. This study aims to determine the levels of phosphorus in raw green okra, steamed, and stew as commonly consumed by people. The research method using wet digestion analysis and measurement with visible spectrophotometry with the addition of phosphorus reagent color developer which is a mixture ammonium molibdat 4%, ascorbic acid 0.1 N, antimonil potassium tartrate, and 5N sulfuric acid produces a blue color and is measured at a wavelength of 722, 50 nm with the working time in the 30th minute to the 38th minute. Levels of phosphorus obtained from raw green okra 62.115 mg / 100 g, steamer 60.130 mg / 100 g,Okra hijau merupakan salah satu sayuran yang mengandung mineral cukup tinggi. Salah satu mineral tersebut adalah fosfor, yaitu mineral esensial yang dibutuhkan untuk pertumbuhan dan perbaikan sel-sel di dalam tubuh. Penelitian ini bertujuan untuk menentukan kadar fosfor pada okra hijau mentah, kukusan, dan rebusan sebagaimana lazimnya dikonsumsi oleh masyarakat. Metode penelitian dengan menggunakan analisis destruksi basah dan pengukuran dengan spektrofotometri sinar tampak dengan penambahan pereaksi pengembang warna fosfor yaitu campuran amoniummolibdat 4%, asam askorbat 0,1 N, kalium antimonil tartrat, dan asam sulfat 5N menghasilkan warna biru dan diukur pada panjang gelombang 722,50 nm dengan waktu kerja pada menit ke-30 hingga menit ke-38. Kadar fosfor yang diperoleh dari okra hijau mentah 62,115 mg/100 g, kukusan 60,130 mg/100 g, dan rebusan 60,040 mg/100 g, dengan hasil validasi diperoleh persen perolehan kembali pada batas penerimaan yang baik sebesar 100,42% dengan presisi (RSD) 1,00%, dan batas deteksi (LOD) 0,0175 μg/ml dan batas kuantitasi (LOQ) 0,0584μg/ml