This research was proposed a circular patch MIMO antenna by using a ring and circular parasitic radiator structure. As a novelty, in order to enhance bandwidth and gain of circular patch MIMO antenna, a conventional circular patch MIMO antenna will be added a ring and a circular parasitic. Therefore, this research was investigated a conventional MIMO antenna (C-MA), ring parasitic MIMO antenna (RP-MA), and circular parasitic MIMO antenna (CP-MA) as Model 1, Model 2, and Model 3, respectively. This MIMO antenna was designed on FR4 microstrip substrate with r= 4.4, thickness h=1.6 mm, and tan = 0.0265.This MIMO antenna has center frequency 2.35 GHz which is a frequency band for LTE application in Indonesia. An Advance Design System (ADS) software was used to determine the antenna parameters.

A multiwideband bandpass filter (MW-BPF) using a quad cross-stub stepped impedance resonator (QC-SSIR) was simulated, fabricated, and measured. The proposed QC-SSIR is designed on a four-series arrangement of crossed open stub (COS) structures where each open stub is developed with a step impedance resonator (SIR) structure to generate a wide bandwidth. Compared to the COS resonator, the QC-SSIR has a wider fractional bandwidth and good transmission coefficients and is compact. ABCD matrix analysis is used to investigate the filter structure. Furthermore, the MW-BPF is designed on an FR4 microstrip substrate with εr = 4.4, thickness h = 1.6 mm, and tan δ = 0.0265. The results show that the proposed MW-BPF using a QC-SSIR achieves transmission coefficients/fractional bandwidths of −0.60 dB/49.3%, −1.49 dB/18.7%, and −1.93 dB/13.9% at 0.81 GHz, 1.71 GHz, and 2.58 GHz, respectively. Furthermore, to reduce the filter size, a folded QC-SSIR (FQC-SSIR) structure was also proposed. The results show that the proposed MW-BPF using an FQC-SSIR achieves transmission coefficients/fractional bandwidths of −0.57 dB/49.6%, −1.21 dB/17.7%, and −1.76 dB/12.5% at 0.82 GHz, 1.80 GHz, and 2.62 GHz, respectively. The size of the proposed MW-BPF using an FQC-SSIR is reduced by up to 46% compared with the MW-BPF using a QC-SSIR. Finally, the performance of the simulated MW-BPF based on the QC-SSIR and FQC-SSIR was in good agreement with the measurement results.

Abstract-Magnetically coupled coils have been widely used for a variety of applications requiring contactless or wireless power transfer (WPT). In this paper, the wireless power transfer (WPT) using Copper (Cu) and Aluminium (Al) as magnetic coupling is designed, fabricated and measured. A main problem of wireless power transfer (WPT) is about low efficiency. As state of the art, this research will investigate the effects of the use of copper and aluminum as magnetic coupling. A Copper (Cu) and Aluminium (Al) are used as transmitter (Tx) and receiver (Rx) vice versa. A power analysis has been carried out to identify the efficiency system. The measurement result shown that the wireless power transfer (WPT) using aluminum as transmitter (Tx) and receiver (Rx) have the highest efficiency. The overall efficiency of the power being transferred is about 7,51%-10,8% at distance 20 cm. This research shown that aluminum can consider as a material for the wireless power transfer with magnetic induction method.Index Terms-Wireless power transfer, receiver, transmitter, copper, aluminium. I. INTRODUCTIONNowadays, magnetically coupled coils have been widely used for a variety of applications requiring contactless or wireless power transfer (WPT). Tesla has demonstrated that, for a pair of magnetically coupled resonators with one used as a transmitting unit and the other as receiving unit, optimal wireless power transfer could occur at the resonance frequency of the resonators [1]. A pair of L-C loop resonators for wireless power transfer proposed by Tesla shown in Fig. 1.The most popular wireless power transfer technique used in biomedical implanted devices is near-field inductive coupling. Researches have indicated that if near-field techniques are used and if the range of energy transfer distance is of the order of tens of centimeters, the overall efficiency of the power being transferred is only about 1%-2% [2].The magnetically coupled resonators were presented for wireless power transfer. It now becomes possible to transmit power efficiently at ranges longer than that realized using inductive coupling schemes [3]. For low-power applications, wireless power transfer has found applications in battery charging for portable electronic products such as mobile phones [4]- [7], and mobile laptop charging [8], [9].In Fig. 2 show, typical exponential decay curve of the efficiency as a function of transmission distance for wireless Manuscript received August 21, 2015; revised January 6, 2016. The authors are with Telecommunication Engineering, State Polytechnic of Jakarta, Depok, West Java, Indonesia (e-mail: totosupr@yahoo.com).power transfer (WPT). A main problem of wireless power transfer (WPT) is about low efficiency. As state of the art, this research will investigate the effects of the use of copper and aluminum as magnetic coupling. II. WIRELESS TRANSFER POWERIf two resonators are placed in proximity to one another such that there is coupling between them, it becomes possible for the resonators to exchange energy. The effi...

Technology of 4G is a cellular technology improved from 3G and 2G which provide network with the bandwidth of 75MHz and operated frequency of 1800 MHz. In a process of receiving and sending information signal, 4G system need antenna as the device functioning to send electromagnetic to the air. When information signal is transmitted, there was possibility that the signal weaken which caused by several factors such as air, building wall thickness and weather. Rectangular circular patch array 1x8 microstrip antenna is an antenna functioning as 4G signal strengthens at the frequency of 1800MHz. Antenna was design by using software of CST Studio Suite. From the result of rectangular circular patch array 1x8 microstrip antenna measurement at the frequency of 1800 MHz, it was obtained that the gained was 7.32 dB, VSWR was 1.208, and return loss was -20.3 dB. Performance test of antenna was conducted for 4 Indonesia’s cellular providers namely Telkomsel, Indosat Ooredoo, XL, and 3 in various places. The test result in PNJ telecommunication laboratory showed that the best average value of RSRP from provider of Indosat Ooredoo was-72.9 dBm, the best average value of RSPP from provider of 3 was -70.7 dBm located in Bambon raya, and the best average value of RSPP from provider of XL was -65.2 dBm located in Cibubur.

Kebutuhan permintaan koneksi data pada pelanggan saat ini semakin meningkat. FTTx sebagai salah satu teknologi Fix broadband (FBB) mempunyai beberapa kelemahan terutama bila diterapkan pada wilayah rural. LTE Home sebagai sebuah teknologi smart home merupakan bentuk layanan teknologi WTTx 4G LTE yang diharapkan mampu memenuhi kebutuhan data pada pelanggan. Operator seluler mempunyai kesempatan menggunakan teknologi tersebut pada frekuensi 2300 MHz dengan mode Time Divison Duplexing (TDD). Penelitian ini bertujuan merancang dan menganalisa implementasi LTE home dengan mengukur nilai QoS Class Identifier (QCI) dan nilai Radio Frekuensi Key Performance Indicator (RF KPI) guna meningkatkan kehandalan (realibility) jaringan untuk layanan komunikasi suara dan data. Parameter yang diukur adalah packet loss, delay, jitter, throughput untuk nilai QCI serta Radio Signal Received Power (RSRP) dan Radio Signal Received Quality (RSRQ) untuk nilai RF KPI. Hasil Pengukuran RF KPI didapatkan bahwa nilai untuk RSRP adalah-89dBm. Nilai ini tergolong baik karena sesuai dengan standart KPI yang telah ditetapkan, yaitu antara-70 sampai-90 dBm. Untuk nilai RSRQ diperoleh sebesar-11dBM, hasil ini tergolong baik sesuai standart KPI yaitu <-8 dBm. Hasil ini menunjukkan bahwa kualitas layanan jaringan 4GLTE yang disediakan untuk layanan implementasi LTE Home telah memenuhi standar nilai RF KPI. Sedangkan untuk parameter QCI diperoleh hasil bahwa baik voice call maupun video streaming, nilai masih memenuhi standar baik untuk nilai User Experience KPI (QCI) yaitu packet loss < 5 %, delay < 150 ms dan jitter < 75 ms

Abstract Magnetically coupled coils have been widely used for a variety of applications requiring contactless or wireless power transfer (WPT). In this paper, the wireless power transfer (WPT) using Copper (Cu) and Aluminium (Al) as magnetic coupling is designed, fabricated and measured. A main problem of wireless power transfer (WPT) is about low efficiency. As state of the art, this research will investigate the effects of the use of copper and aluminum as magnetic coupling. A Copper (Cu) and Aluminium (Al) are used as transmitter (Tx) and receiver (Rx) vice versa. A power analysis has been carried out to identify the efficiency system. The measurement result shown that the wireless power transfer (WPT) using aluminum as transmitter (Tx) and receiver (Rx) have the highest efficiency. The overall efficiency of the power being transferred is about 7,51%-10,8% at distance 20 cm. This research shown that aluminum can consider as a material for the wireless power transfer with magnetic induction method. Keywords: wireless power transfer, receiver, transmitter, copper, aluminium Abstrak Magnetically coupled coils digunakan untuk bermacam-macam kebutuhan pemakaian tanpa kontak langsung atau transfer daya tanpa kabel ( WPT). Pada paper ini, transfer daya tanpa kabel (WPT) menggunakan tembaga dan aluminium sebagai magnetic coupling yang di rancang, pabrikasi dan diukur. Permasalahan utama dari WPT adalah efisiensi daya rendah. Sebagai state of the art, penelitian ini akan membahas pengaruh dari penggunaan tembaga dan aluminium sebagai magnetic coupling. Sebuah tembaga dan aluminium digunakan sebagai pemancar (TX) dan penerima (Rx). Analisis daya dilakukan untuk melihat efisiensi system. Hasil pengukuran didapatkan bahwa WPT menggunakan aluminium sebagai pemancar dan penerima mempunyai efisiensi tertinggi. Efisiensi daya yang di transfer sekitar 7,51%-10,8% pada jarak 20 cm. Hal tersebut membuktikan bahwa bahan aluminium layak dipertimbangkan dalam penggunaannya sebagai material penyusun antena dalam alat transfer daya tanpa kabel dengan metode induksi resonansi magnetik Katakunci : WPT, Ring Loop, Antena, Tembaga, Alumunium

Selada merupakan salah satu jenis tanaman sayuran yang mudah untuk dibudidaya dan dapat tumbuh subur dengan optimal pada suhu  25°C - 28°C dan kelembapan tanah 65% - 78%. Kendala keterbatasan lahan yang dimiliki menyebabkan sulitnya melakukan budidaya tanaman selada. Bilik tanaman adalah alternatif solusi untuk permasalahan tersebut. Bilik tanaman dibuat seperti ruangan bertingkat yang berisi susunan rak yang diisi tanah untuk menanam selada. Sistem ini menggunakan arduino uno, sensor suhu DHT22, sensor kelembapan tanah YL69, LCD, kipas DC, solenoid valve, dan raspberry pi. Hasil pengujian sistem, saat nilai suhu yang terdeteksi oleh sensor DHT22 lebih besar sama dengan 28°C maka sistem secara otomatis mengaktifkan kipas untuk mendinginkan bilik, dan saat suhu mencapai kurang atau sama dengan 25°C kipas secara otomatis mati. Untuk nilai kelembapan tanah, saat sensor YL69 kurang atau sama dengan 65% maka sistem secara otomatis menyiram tanaman dan saat kelembapan tanah lebih besar atau sama dengan 78% maka sistem berhenti menyiram tanaman. Semua kondisi sensor tersebut ditampilkan pada LCD I2C 16×2. Untuk hasil pengujian aplikasi whatsapp, saat pemilik mengirimkan perintah “cek tanaman”, maka sistem berhasil mengirimkan notifikasi keadaan bilik seperti suhu, kelembapan tanah, kipas dan  apakah sistem sedang menyiram tanaman atau tidak.

Design High Efficiency Dual Layer microstrip Coupler for Application in Frequency LTE 2.3 GHz. In the study will be designed dual - layer coupler for LTE applications . As the state of the art , design dual - layer coupler to increase the catchment area of radiation so coupling factor and its directivity will increase. Other effects is low radiation loss so the signal power loss can be reduced .It will automatically increase the efficiency of the device . In more detail , this study discusses the design of a dual - layer microstrip coupler with high efficiency for LTE applications at frequency 2.3 GHz . In this study successfully demonstrated a dual - layer simulation results coupler for LTE applications using the Advanced Design System . The results obtained operating frequency of the design microstrip dual-layer coupler is 2.300 GHz , the output ports on port 2 is - 2.754 dB and at port 3 is - 3.298 dB , the second phase difference output of 90.038 ° , the magnitude of the return loss is -30.689 dB , the isolation is -31.185 dB , with VSWR 1.060 , and bandwidth 200 MHz .Keywords : LTE, Transmiter, Receiver, Coupler, Coupling Area, Dual-Layer.ABSTRAK Pada penelitian ini dipergunakan metode dual-layer coupler untuk aplikasi LTE. Sebagai state of the art, perancangan dual-layer coupler bertujuan untuk meningkatkan area tangkapan radiasi sehingga diharapkan coupling faktor dan directivity nya menjadi meningkat. Efek lainnya yaitu loss radiasi nya rendah sehingga nilai loss power sinyalnya dapat ditekan. Apabila nilai loss power sinyalnya rendah, maka secara otomatis akan meningkatkan nilai efisiensi perangkat. Secara lebih rinci, inti penelitian ini membahas perancangan dual-layer microstrip coupler yang memiliki efisiensi yang tinggi untuk aplikasi LTE pada frekuensi 2,3 GHz. Pada penelitian ini berhasil ditunjukan hasil simulasi dual-layer coupler untuk aplikasi LTE dengan menggunakan Advanced Design System. Hasil perancangan didapat frekuensi kerja dari microstrip dual layer coupler adalah 2,300 GHz, output port pada port 2 adalah – 2,754 dB dan pada port 3 adalah – 3,298 dB, beda fasa kedua output sebesar 90,038°, besarnya return loss adalah -30,689 dB, isolasi sebesar -31,185 dB, VSWR sebesar 1,060, dan bandwidth sebesar 200 MHz.Kata kunci : LTE, Transmiter, Receiver, Coupler, Coupling Area, Dual-Layer.