• Title/Summary/Keyword: 1.8GHz 대역

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Study on the CPWG Antenna of 1.8GHz (1.8GHz 대역용 CPWG 안테나 연구)

  • Park, Yong Wook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.2
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    • pp.259-264
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    • 2016
  • In this study, the properties of a patch antenna fed by a coplanar waveguide with ground (CPWG) and design method were studied. The antenna was impedance-matched to the CPWG feedline by adjusting the width, length, and position of the patch. To improve the frequency properties of the CPWG type antenna, patch length, patch width, patch position, and ground distance were simulated using HFSS (High Frequency Structure Simulator) simulation program. A CPWG antenna of 1.8 GHz for LTE band was designed and fabricated by photolithography on an FR4 substrate (dielectric constant of 4.4 and thickness of 0.8 mm). The fabricated antenna was analyzed using a network analyzer. The measured results agree well with the simulations, which confirmed the validity of this study. The fabricated CPWG antenna showed a center frequency, minimum return loss and -10dB bandwidth of 1.8GHz, -32.1dB, 22MHz and $50.2{\Omega}$ respectively. The proposed antenna is expected to be applicable to the LTE band.

A Study on the Development of 38 GHz Hybrid Power Amplifier Module (38 GHz 하이브리드 전력증폭기 모듈 개발에 관한 연구)

  • 윤양훈
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.10B
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    • pp.1701-1706
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    • 2000
  • In this work a 38 GHz hybrid 2-stage power amplifier module using GaAs pHEMTs and waveguide to microstrip transitions has been successfully developed. A 10 mil thickness duroid substrate was use for fabrication of the power amplifier and the waveguide to microstrip transitions. The fabricated waveguide to microstrip transition showed about 1 dB insertion loss(back to back) at 32-40 GHz. The measured results of power amplifier module showed 29 dBm output power(P1.5dB), 7,2 dB associated gain and 11.2% power-added efficiency(PAE) at 36.8-38.5 GHz.

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Radar Imaging of Concrete Specimens with Improved Resolution Using Expanded Frequency Bandwidth (주파수 대역 확장을 이용한 콘크리트 시편의 레이더 영상 분해능 향상)

  • 임홍철;이주희
    • Journal of the Earthquake Engineering Society of Korea
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    • v.6 no.1
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    • pp.13-21
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    • 2002
  • Frequency bandwidth has been combined to determine adequate frequency bandwidth which is necessary for nondestructive testing when using inverse synthetic aperture radar(ISAR). For imaging inside of concrete specimens using radar, the principles of radar and signal processing are discussed. Experimental data obtained from radar measurement of three different concrete specimens at two different frequency bandwidths of 2∼3.4 GHz, 3.4∼5.8 GHz and these two frequencies are combined to obtain improved imagery. A signal processing scheme has been implemented to visualize inside concrete specimens. The influence of frequency bandwidth was analyzed in nondestructive testing by changing frequency bandwidth for concrete specimen.

Design of 2.4/5.8GHz Dual-Frequency CPW-Fed Planar Type Monopole Active Antennas (2.4/5.8GHz 이중 대역 코프래너 급전 평면형 모노폴 능동 안테나 설계)

  • Kim, Joon-Il;Chang, Jin-Woo;Lee, Won-Taek;Jee, Yong
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.8
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    • pp.42-50
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    • 2007
  • This paper presents design methods for dual-frequency(2.4/5.8GHz) active receiving antennas. The proposed active receiving antennas are designed to interconnect the output port of a wideband antenna to the input port of an active device of High Electron Mobility Transistor directly and to receive RF signals of 2.4GHz and 5.2GHz simultaneously where the impedance matching conditions are optimized by adjusting the length of $1/20{\lambda}_0$(@5.8GHz) CPW transmission line in the planar antenna The bandwidth of implemented dual-frequency active receiving antennas is measured in the range of 2.0GHz to 3.1GHz and 5.25GHz to 5.9GHz. Gains are measured of 17.0dB at 2.4GHz and 15.0dB at 5.2GHz. The measured noise figure is 1.5dB at operating frequencies.

Design of the Microstrip antenna for 5.8GHz WLAN Application (5.8GHz 대역 WLAN용 마이크로스트립 안테나 설계)

  • Jo, Sung-sik;Lim, Tae-kyun;Ju, Yan-ro;Kim, Kab-ki
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2009.10a
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    • pp.453-456
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    • 2009
  • In this paper, a Microstrip antenna for wireless LAN is designed in HyperLAN 5GHz. The IEEE 802.11a have allocated HyperLAN band. We proposed CPW-fed antenna structure for compact antenna. This structure shows that a ground plane and a patch plane are existed at one layer. The proposed antenna is designed on FR-4 substrate with a relative dielectric constant 4.3, thickness of 1.5mm and tangent loss 0.02. The designed antenna shows that VSWR is below 2 and has good return loss below -10dB over the 5.725~5.825GHz bandwidth with HyperLAN.

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Design of Dualband Meander Microstrip Antenna for WBAN (WBAN용 이중대역 미엔더 마이크로스트립 안테나 설계)

  • Oh, Ho-Kweon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.2
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    • pp.265-271
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    • 2015
  • In this paper, Dualband meander microstrip antenna is proposed for Wireless Body Area Network application. Designed antenna is mounted on the phantom to maintain a constant distance of the substrate, and studied the characteristics related to change in several meaningful parameters to improve performance. Characteristics of antenna, returnloss, radiation pattern, gain, bandwidth, are analyzed using Computer Simulation Technologes(CST) software. The proposed antenna operates at 4.33Ghz and 6.09GHz ~ 9.88GHz for UWB. The antenna showed that returnloss and -10dB bandwidth are -42.30dB and 410Mhz at 4.33GHz, maximum -29.11dB and 3.75GHz at 6.1GHz ~ 9.8GHz.

A Multi-Band Antenna on Automobile-Glass Using Flexible PCB (유연성 기판을 이용한 자동차 유리 부착용 다중 대역 안테나)

  • Kim, In-Bok;Woo, Dong-Sik;Kim, Kang Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.1
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    • pp.20-26
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    • 2013
  • In this paper, we propose a multi-band monopole antenna with a band-notching U-slot, which is fabricated inside the flexible polymide film substrate. The U-shaped slot located on the patch-shaped monopole antenna provides band-notch at 2.7 GHz, but also helps to improve return loss at adjacent frequency bands. The performance of the antenna attached on an automobile-glass has been simulated and measured. The fabricated antenna provides more than 10 dB return loss for ISM band(2.4~2.483 GHz) and WAVE band(5.85~5.925 GHz), 2.8~5.7 dBi maximum gain, and good radiation patterns.

A Study on Multi-band Antenna for Mobile using Coupling Feeding (커플링 급전을 이용한 모바일용 다중대역 안테나에 관한 연구)

  • WANG, Cheng;YOON, In-seop;HWANG, Sun-gook;YAN, Xiao-jia;PARK, Hyo-Dal
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.7 no.4
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    • pp.188-194
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    • 2014
  • In this paper, an antenna which has quad band in LTE (0.746 ~ 0.798 GHz), GSM(0.824 ~ 0.960 GHz), DCS(1.71 ~ 1.88 GHz), WCDMA(1.91 ~ 2.17 GHz) is proposed. An antenna size is $122mm{\times}50mm{\times}0.8mm$ on FR4(${\epsilon}_r=4.4$) ground substrate. In the proposed antenna, branch line is applied to the conventional PIFA architecture to achieve multi-bandwidth. Coupling power supply is applied for a wide bandwidth. Result of the measurement is as follows. When the low frequency, the antenna presents gain of 0.93 ~ 1.92dBi, and radiation efficiency of 49.60 ~ 76.35 %, and When the high frequency, gain is 2.19 ~ 4.66dBi, and radiation efficiency is 60.40 ~ 80.01 %, and with a VSWR < 2 (${\leq}-10dB$)measurement results for standard satisfies all band. Judging from the result, proposed multiband antenna is expected to be applied. B4G mobile terminals since the antenna shows an outstanding performance.

GaN HPA Monolithic Microwave Integrated Circuit for Ka band Satellite Down link Payload (Ka 대역 위성통신 하향 링크를 위한 GaN 전력증폭기 집적회로)

  • Ji, Hong-Gu
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.12
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    • pp.8643-8648
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    • 2015
  • In this paper presents the design and demonstrate 8 W 3-stage HPA(High Power Amplifier) MMIC(Monolithic Microwave Integrated Circuits) for Ka-band down link satellite communications payload system at 19.5 GHz ~ 22 GHz frequency band. The HPA MMIC consist of 3-stage GaN HEMT(Hight Electron Mobility Transistors). The gate periphery of $1^{st}$ stage, $2^{nd}$ stage and output stage is determined $8{\times}50{\times}2$ um, $8{\times}50{\times}4$ um and $8{\times}50{\times}8$ um, respectively. The fabricated HPA MMIC shows size $3,400{\times}3,200um^2$, small signal gain over 29.6 dB, input matching -8.2 dB, output matching -9.7 dB, output power 39.1 dBm and PAE 25.3 % by using 0.15 um GaN technology at 20 V supply voltage in 19.5~22 GHz frequency band. Therefore, this HPA MMIC is believed to be adaptable Ka-band satellite communication payloads down link system.

Design of the Wideband Notched Compact UWB Antenna (넓은 대역폭이 소거된 소형 UWB 안테나 설계)

  • Kim, Cheol-Bok;Lim, Jung-Sup;Lee, Ho-Sang;Jang, Jae-Sam;Jung, Young-Ho;Jo, Dong-Ki;Lee, Mun-Soo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.9
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    • pp.54-62
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    • 2007
  • In this paper, a novel wideband notched compact UWB antenna is designed to satisfy the licensed UWB frequency bandwidth($3.1{\sim}4.8$ GHz, $7.1{\sim}10.2$ GHz) by symmetrically arranging two adjacent sectorial loop antennas. The wideband($4.8{\sim}7.1$ GHz) notch can be obtained by inserting the inverted-L shaped slits on the patch. The designed UWB antenna has return loss lower than -10dB at 3.1 GHz and over, group delay value lower than 1 ns and the linear phase property. The optimized UWB antenna inserted the inverted-L shaped slits has return loss great than -10dB, 5 ns of group delay, nonlinear phase and decreased gain properties over the frequency band, 4.8 GHz to 7.1 GHz.