VNU-UET Repository: No conditions. Results ordered -Date Deposited. 2024-03-29T13:28:04ZEPrintshttp://eprints.uet.vnu.edu.vn/images/sitelogo.pnghttps://eprints.uet.vnu.edu.vn/eprints/2019-12-24T04:37:09Z2019-12-24T04:37:46Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/3811This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/38112019-12-24T04:37:09ZDesign and Fabrication of a Ku-band Low Noise Amplifier using FR-4 SubstrateThe Low Noise Amplifier (LNA) plays an important role in many communication systems, especially at the receiver’s front-ends. In modern RF designs, The LNA is usually fabricated on a microstrip printed circuit board (PCB) due to its simplicity and ability of integrating flexibly with other components in a receiving circuitry unit. At frequencies lower than 6 GHz, the most prevalent substrate material for a microstrip LNA is FR-4 while at higher frequencies of over 10 GHz, it is challenging to design the LNA using this material without causing considerable losses to the RF signal. There are many works related to design microstrip LNA at high frequencies, however, the dielectric substrates used in most of them were high-cost materials for low dielectric loss. This paper introduces an LNA topology using the common, low-cost FR-4 substrate which can be operated in Ku-band for applications such as small satellites’ receivers, with the expected noise figure of lower than 1 dB, gain of around 10 dB and the return loss of around -10 dB. The stepped impedance matching technique has been used for transmission line optimization. The simulated and measured results are presented.Phuong Linh Tatplinh@vnsc.org.vnBernard Journetbernard.journet@ens-cachan.frGia Duong Bachduongbg@vnu.edu.vn2016-12-29T12:10:53Z2016-12-29T12:10:53Zhttp://eprints.uet.vnu.edu.vn/eprints/id/eprint/2198This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/21982016-12-29T12:10:53ZResearch, Design and Fabrication of 2.45 GHz Microstrip Patch Antenna Arrays for Close-Range Wireless Power Transmission SystemsAntennas play a very important role in wireless
power transmission (WPT) systems using microwave since they
affect the system transmission efficiency. General requirements
for an antenna used for WPT systems are high directivity and
narrow beamwidth. This paper presents the design, simulation
and fabrication of microstrip patch antenna arrays for closerange
WPT systems. Various antenna prototypes such as single
patch, 2�2, 2�4, 4�8 and 8�8 microstrip patch antenna arrays
working at 2.45 GHz are proposed. The 2�4 microstrip
patch antenna array is fabricated and measured using Anritsu
37364D Vector Network Analyzer and NSI 2000 Nearfield System.
Measurement results show that the fabricated antenna obtains a
directivity of 14.7 dBi and a 3 dB beamwidth of 23.2 degree. The
experiment with the WPT system is carried out. This paper also
presents structure of a WPT system and the role each building
block in the system.
Index Terms—Wireless Power Transmission, Rectenna, Microstrip
Patch, Antenna Array, Microwave EngineeringHoang Giang Bachgiangbh@vnpt-hanoi.com.vnVan Giap Nguyengiapnv_57@vnu.edu.vnPhuong Linh TaTuan Anh Vutanhvu@vnu.edu.vnGia Duong Bachduongbg@vnu.edu.vn