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  • Koesmarijanto, Koesmarijanto  (8)
  • 1
    In: Jartel, Politeknik Negeri Malang, ( 2022-09-30), p. 178-184
    Abstract: Wireless technology is a wireless communication technology that is currently widely used by the public to exchange information. The current information exchange is growing as communication requirements rise. The antenna design needs to be improved in order to boost bandwidth. Microstrip antennas are one kind of antenna that can be used for wireless communication. Meanwhile, to improve the bandwidth value of the antenna can be done using the Defected ground structure or DGS technique. The results of testing the microstrip array circular patch antenna with DGS at 2462 MHz frequency show that it has a maximum gain of 15.7 dBi at a frequency of 2530 MHz and a return loss value of -19.3 dB with a VSWR value of 1,242. There is a type of directional radiation pattern in the antenna of the Microstrip Array with DGS. This study's findings indicate that the Circular Array Microstrip antenna with DGS has a bandwidth of 73 MHz while the Circular Microstrip Array without DGS has a lesser bandwidth of 28 MHz.
    Type of Medium: Online Resource
    ISSN: 2654-6531 , 2407-0807
    URL: Issue
    Language: Unknown
    Publisher: Politeknik Negeri Malang
    Publication Date: 2022
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    Politeknik Negeri Malang ; 2022
    In:  JURNAL ELTEK Vol. 20, No. 2 ( 2022-10-28), p. 70-
    In: JURNAL ELTEK, Politeknik Negeri Malang, Vol. 20, No. 2 ( 2022-10-28), p. 70-
    Abstract: Abstrak Penelitian ini menguji kinerja perangkat pelarut tembaga skala kecil untuk digunakan di labotarium elektronika. Bahan kimia ferri clorida 40 % 1500 ml digunakan sebagai bahan pelarut dasar, perangkat ini digunakan untuk menghapus atau menghilangkan sebagian lapisan tembaga yang tidak diperlukan pada rangkaian di Printed Circuit Board (PCB). Sebuah kamera digunakan sebagai sensor kepekatan larutan yang telah digunakan untuk menghapus lapisan tembaga. Data sensor diproses dengan menggunakan Raspberry Pi yang digunakan sebagai pembanding perhitungan kepekatan larutan secara manual dan data dikirimkan ke aplikasi android. Metoda pengalamatan warna Red, Green, dan Blue (RGB) digunakan untuk menentukan kadar tembaga berdasarkan warna yang ditangkap kamera. Hasil pengujian menunjukkan kamera mengidentifikasi warna untuk kadar tembaga dalam laruran mulai dari 0% sampai dengan 0,121 % dan waktu yang diperlukan untuk melarutkan tembaga mencapai 45 menit yang akan digunakan acuan untuk menentukan larutan sudah jenuh. Hasil pengolahan data menghasilkan tampilan kejenuhan dari 30% sampai dengan 100%, artinya perubahan warna untuk kadar laruran kurang dari 0,02% tidak dapat diidentifikasi demikian juga untuk diatas 0,121%. Dengan demikian dapat disimpukan perangkat ini hanya mampu mendeteksi kadar tembaga dalam pelarut diatas 0.02% hingga maksimum 0,121%. Abstract This research tested the performance of a small-scale copper solvent device for use in an electronics laboratory. The chemical ferric chloride 40 % 1500 ml is used as a primary solvent. This device removes or partially removes the copper layer that is not needed on the circuit on the Printed Circuit Board (PCB). A camera is used as a sensor for the concentration of a solution used to remove the copper layer. Sensor data is processed using a Raspberry Pi, which compares the attention of the solution manually and the data sent to the Android application. The Red, Green, and Blue (RGB) colour addressing method is used to determine the copper content based on the colour captured by the camera. The test results show the camera identifies the colour for the copper content in the solution ranging from 0% to 0.121%. The time required to dissolve the copper reaches 45 minutes, which will be used as a reference to determine whether the solution is saturated. The data processing results produce a saturation display from 30% to 100%, meaning that the colour change for a solution content of less than 0.02% cannot be identified as well as for those above 0.121%. Thus, it can be concluded that this device can only detect copper levels in solvents above 0.02% up to a maximum of 0.121%.
    Type of Medium: Online Resource
    ISSN: 2355-0740 , 1693-4024
    URL: Issue
    Language: Unknown
    Publisher: Politeknik Negeri Malang
    Publication Date: 2022
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  • 3
    Online Resource
    Online Resource
    Politeknik Negeri Malang ; 2021
    In:  Jurnal Jartel: Jurnal Jaringan Telekomunikasi Vol. 11, No. 1 ( 2021-03-31), p. 12-16
    In: Jurnal Jartel: Jurnal Jaringan Telekomunikasi, Politeknik Negeri Malang, Vol. 11, No. 1 ( 2021-03-31), p. 12-16
    Abstract: Kebutuhan yang semakin meningkat akan banyaknya data yang dikirim dan kecepatan pengiriman data melalui teknologi wireless mengakibatkan tingginya minat terhadap perangkat dengan Bandwidth lebar. Memperbaiki desain antena adalah salah satu cara untuk meningkatkan Bandwidth. Antena didesain sedemikian rupa agar mendapatkan parameter antena yang bernilai efektif salah satunya untuk meningkatkan bandwidth antena. Salah satu teknik yang digunakan untuk memperbaiki parameter antena miksrostrip yaitu teknik Defect Ground Structure (DGS)  dengan metode yang digunakan adalah perhitungan, simulasi dan pengujian. Hasil pengujian antena mikrostrip array semicircular tanpa DGS diperoleh nilai parameter return loss sebesar -13,7 dB dan nilai VSWR sebesar 1,518 serta memiliki gain bernilai 1,3 dBi pada frekuensi 2455 MHz. Antena ini memiliki bentuk pola radiasi bidirectional. Bandwidth antena yang diperoleh sebesar 14 MHz. Hasil pengujian antena mikrostrip array semicircular dengan DGS diperoleh nilai parameter return loss sebesar -14,4 dB dan nilai VSWR sebesar 1,469 serta memiliki gain bernilai 2,8 dBi pada frekuensi 2455 MHz. Antena ini memiliki bentuk pola radiasi directional. Bandwidth antena yang diperoleh sebesar 10 MHz. Kesimpulan dari penelitian ini adalah antena mikrostrip array semicircular tanpa DGS mempunyai bandwidth yang lebih kecil dibandingkan dengan antena mikrostrip array semicircular dengan DGS yaitu dengan selisih sebesar 3,5 MHz.
    Type of Medium: Online Resource
    ISSN: 2654-6531 , 2407-0807
    Language: Unknown
    Publisher: Politeknik Negeri Malang
    Publication Date: 2021
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  • 4
    Online Resource
    Online Resource
    Politeknik Negeri Malang ; 2022
    In:  Jurnal Jartel Jurnal Jaringan Telekomunikasi Vol. 12, No. 4 ( 2022-12-30), p. 232-238
    In: Jurnal Jartel Jurnal Jaringan Telekomunikasi, Politeknik Negeri Malang, Vol. 12, No. 4 ( 2022-12-30), p. 232-238
    Abstract: This study discusses the design and manufacture of microstrip antennas that aim to widen the bandwidth in the application of Wi-Fi in the form of a hexagonal patch composed of a 2x4 element array. Microstrip antennas have a weakness, namely narrow bandwidth, therefore a modification is needed using the DGS (Defected Ground Structure) method in the form of a dumbbell circle head. The allocation of the Wi-Fi working frequency that is often used in the community is 2.4 GHz in accordance with the IEEE 802.11 protocol standard. This study discusses the result and the effect of the performance of an 2x4-element microstrip array antenna using DGS. This DGS is placed on the ground plane and uses a PCB with an epoxy fiberglass substrate material which has a dielectric constant of 4.58. The result of this research is an external device, namely a microstrip antenna that can increase data transfer capacity and work on a Wi-Fi frequency of 2.4 GHz. This research is in accordance with the antenna test parameters, which have a return loss value of -22.7 dB and VSWR 1.15. 1. The results of testing the bandwidth of the hexagonal 2x4 element microstrip patch antenna with a defected ground structure of 34 MHz. The radiation pattern of the hexagonal 2x4 element microstrip patch antenna using DGS is directional. The results of the power level implementation of a hexagonal microstrip patch antenna arranged in a 2x4 array using a DGS dBm can increase power level by 7 dBm.
    Type of Medium: Online Resource
    ISSN: 2654-6531 , 2407-0807
    URL: Issue
    Language: Unknown
    Publisher: Politeknik Negeri Malang
    Publication Date: 2022
    Location Call Number Limitation Availability
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  • 5
    Online Resource
    Online Resource
    Politeknik Negeri Malang ; 2022
    In:  Jurnal Jartel Jurnal Jaringan Telekomunikasi Vol. 12, No. 4 ( 2022-12-30), p. 251-257
    In: Jurnal Jartel Jurnal Jaringan Telekomunikasi, Politeknik Negeri Malang, Vol. 12, No. 4 ( 2022-12-30), p. 251-257
    Abstract: Antennas are an important component in wireless communication systems that continue to grow in the use of the 2.4 GHz frequency for 4G/LTE applications. Technology in the field of telecommunications has developed very rapidly using wireless communication, which is easily accessible by various devices, for example, Wi-Fi or Wireless Fidelity. Microstrip antenna is one type of antenna that has a narrow bandwidth, small gain. This research aims to widen the bandwidth by designing and manufacturing a truncated corner microstrip patch antenna with a 2x4 array at a frequency of 2.4 GHz with a U-slot. The truncated corner method is used to obtain circular polarization. The truncated corner microstrip antenna is designed by cutting corners. The array method is used to obtain the maximum gain value, while the addition of U-slot aims to reduce the return loss and Voltage Standing Wave Ratio (VSWR) values.
    Type of Medium: Online Resource
    ISSN: 2654-6531 , 2407-0807
    URL: Issue
    Language: Unknown
    Publisher: Politeknik Negeri Malang
    Publication Date: 2022
    Location Call Number Limitation Availability
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  • 6
    Online Resource
    Online Resource
    Politeknik Negeri Malang ; 2022
    In:  Jartel ( 2022-09-30), p. 128-131
    In: Jartel, Politeknik Negeri Malang, ( 2022-09-30), p. 128-131
    Abstract: Energy has been a human need since ancient times which has been an indicator of prosperity. However, that doesn't mean there won't be problems. The longer the petroleum reserves are getting depleted, so sooner or later humans must make more use of non-fossil alternative energy. An example is solar energy whose availability will never run out. Therefore, the application of Solar Power Generation (PLTS) technology to utilize its energy potential. The goal of the project is to develop a system for integrating solar power with electrical grids that can track the voltage and current of the applied load. The PZEM004T sensor produces an accuracy of 99.4 percent on the voltage variable test, which compares favorably with the ACS712 current sensor's accuracy of 97.8 percent. The lowest light intensity measured in the current variable test is 24351 lux with an output voltage of 17.32V at the time range between 4-5 pm, and the highest is 103901 lux with an output voltage of 18.9V at the time range between 11-12 am. Accuracy is 98.5 percent with light loads and 99.2 percent when the charger is used. Relays' ability to switch between resources has been tested, and the results have met expectations.
    Type of Medium: Online Resource
    ISSN: 2654-6531 , 2407-0807
    URL: Issue
    Language: Unknown
    Publisher: Politeknik Negeri Malang
    Publication Date: 2022
    Location Call Number Limitation Availability
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  • 7
    Online Resource
    Online Resource
    Politeknik Negeri Malang ; 2023
    In:  Jartel Vol. 13, No. 1 ( 2023-02-11), p. 36-42
    In: Jartel, Politeknik Negeri Malang, Vol. 13, No. 1 ( 2023-02-11), p. 36-42
    Abstract: — Technological advances in the field of telecommunications without cables or wireless are growing rapidly by utilizing radio waves as transmission. This happens because people's mobility is currently quite high and requires practicality in the use of devices. The discussion in this paper is about the comparison of the design and fabrication performance of a diamond microstrip patch antenna composed of a 2x4 element array using DGS and without using DGS. The design was carried out using the CST 2018 simulator. The DGS was placed on a PCB ground plane with an epoxy fiberglass substrate having a dielectric constant of 4.58. This is measured by improving the value of VSWR, return loss, and bandwidth. The application of the working frequency used by the microstrip antenna is at (2401-2495) MHz for WIFI (Wireless Fidelity) networks. Microstrip antennas have a narrow bandwidth shortage, so they require bandwidth widening using the DGS (Defected Ground Structure) technique in the form of dumbbell square ahead. The resulting bandwidth is 15 MHz wider than a microstrip antenna without DGS. This research is in accordance with the antenna test parameters, which have a return loss value of -24.3dB, VSWR 1.12 and a bandwidth of 34 MHz.
    Type of Medium: Online Resource
    ISSN: 2654-6531 , 2407-0807
    URL: Issue
    Language: Unknown
    Publisher: Politeknik Negeri Malang
    Publication Date: 2023
    Location Call Number Limitation Availability
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  • 8
    Online Resource
    Online Resource
    Politeknik Negeri Malang ; 2023
    In:  Jurnal Jartel Jurnal Jaringan Telekomunikasi Vol. 13, No. 2 ( 2023-06-30), p. 169-176
    In: Jurnal Jartel Jurnal Jaringan Telekomunikasi, Politeknik Negeri Malang, Vol. 13, No. 2 ( 2023-06-30), p. 169-176
    Abstract: Wireless communication requires a useful device to transmit and receive electromagnetic waves. WiFi is a particular kind of wireless communication device used to send data over the internet network. The bandwidth and signal coverage of WiFi have significant limitations. As a result, an antenna is utilized to enhance signal reception in order to solve this issue. The research method used is to compare the design of the 2x4 octagonal microstrip array antenna using a T-slot and without the T-slot to see the results of simulation and testing in terms of return loss, VSWR, gain, and bandwidth. The results of bandwidth testing for octagonal microstrip antennas without a 2x4 T-slot array are 32 MHz, while for octagonal microstrip antennas using a 2x4 T-slot array of 40MHz. The octagonal microstrip antenna without a 2x4 T-Slot array has Return Loss of -18.2 dB and a VSWR of 1.280. The 2x4 octagonal T-Slot array microstrip antenna has Return Loss of -17.6 dB and a VSWR of 1.303. The test results 2x4 octagonal array microstrip antenna gain without using T-slot produces the largest gain of 9.55dBi, and the antenna using T-slot produces the largest gain of 12.55dBi.
    Type of Medium: Online Resource
    ISSN: 2654-6531 , 2407-0807
    URL: Issue
    Language: Unknown
    Publisher: Politeknik Negeri Malang
    Publication Date: 2023
    Location Call Number Limitation Availability
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