VNU-UET Repository: No conditions. Results ordered -Date Deposited. 2024-03-29T08:33:55ZEPrintshttp://eprints.uet.vnu.edu.vn/images/sitelogo.pnghttps://eprints.uet.vnu.edu.vn/eprints/2019-12-12T09:45:43Z2019-12-12T09:47:13Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3776This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/37762019-12-12T09:45:43ZA design of wideband high-power 3-dB quadrature coupler using defected ground structure for status data
transmitting systemThe paper presents a wideband 3-dB quadrature coupler designed for operation at 2 GHz. The presented coupler is based on a broadside-coupled suspended structure in combination with a proposed defected ground structure (DGS) allowing for high power, wide-band and improved harmonic suppression performance. The experimental results show 0.2 dB of insertion loss, return loss of better than 18 dB and isolation of better than 25 dB in
the frequency range from 1.74 to 2.67 GHz. The proposed coupler is able to be integrated in the status data transmitting system, which is suitable for vessel monitoring. The fundamental characteristics of the implemented coupler have been measured and verified.Dinh The Anh Nguyenndtanh@vnsc.org.vnDuc Long Hoanglonghd@vnu.edu.vnGia Duong Bachduongbg@vnu.edu.vnDragos Dancila2015-12-05T11:11:35Z2015-12-05T11:15:24Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/800This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/8002015-12-05T11:11:35ZStudy, Design and Fabrication of Power Amplifier Module to be used for Wireless Power Transmission System Operating at S BandHuu Chuc DoanDuc Long HoangGia Duong Bachduongbg@vnu.edu.vn2013-01-23T08:41:50Z2013-06-29T04:13:09Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/127This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/1272013-01-23T08:41:50ZStudy, Design, and Fabrication of Power Amplifier Module to be Used for Low-Attitude Radar System Operating at UHF Band (820MHz; 900MHz)In this paper, we introduces the configuration of a high-power solid- state transmitter to be used for modern radar system operating at UHF band (820Mhz; 900Mhz). Specially, the power amplifier module (150W output power) does play a critically important role in such a system being consisting of two-stage 90W-and-200W amplifier that allows the output to reach up to 1.2kW per block, and even approximate 9.6 kW to whole system using the classical power combination method. Our work mainly targets to present the study, design, and fabrication of both 150-Watt basic module and high-power Wilkinson method, which are the key components in the topology. The design and simulated results were carried out by the microwave engineering professional design software, known as ADS2008 package. The achieved results meet the demand of modern radar transmitter. All simulations and experimental results will be reported.Duc Long Hoanglonghd@vnu.edu.vnGia-Duong Bachduongbg@vnu.edu.vn