• Title/Summary/Keyword: Dual Communication Line

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The circuit design to be power transmission or power distribution using the dual characteristic impedance transmission line (이중 특성 임피던스 전송 선로를 이용한 전력 전송 또는 전력 분배가 가능한 회로 설계)

  • Park, Unghee
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.10
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    • pp.2339-2344
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    • 2014
  • of a microstrip transmission line, this transmission line can operate as the microstrip line or the coplanar line according to open or short connection between the ungrounded copper plane and grounded plane on the base plane. Two different type operation of the transmission line means that one transmission line can have two different characteristic impedances. This paper proposes and fabricates the circuit to be operated 2-ports power transmission line or 2-way power divider with the stable input matching characteristic by using this dual-impedance transmission line. The proposed circuit operates 2-ports power transmission line in case of the coplanar line or 2-way power divider line in case of the microstrip line. The fabricated circuit shows $S_{21}$ > -0.2 dB and $S_{11}$ < -15 dB above 700 MHz when the circuit operates 2-ports power transmission line. And, it is $S_{21}$ > -3.8 dB, $S_{11}$ < -10 dB and $S_{21}/S_{31}$ < ${\pm}0.3dB$ above 700 MHz when the circuit operates 2-way power divider.

Dual-band Gysel Power Divider based on Filter Conversion Technique (여파기 변환 기법을 이용한 이중대역 Gysel 전력 분배기)

  • Yoo, Jae-Hyun;Kim, Young
    • Journal of Advanced Navigation Technology
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    • v.17 no.1
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    • pp.33-38
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    • 2013
  • In this paper, we present the design and measured performances of an dual-band Gysel power divider based on band-stop characteristic. After the Gysel divider is designed by lumped elements at single operating frequency, and then using filter conversion technique the lumped elements were changed a band-stop characteristic with dual-band characteristics. The features of this design method are that ${\lambda}/4$ transmission line by replacing lumped elements suppressed harmonic characteristics and also can reduce the size. To validate of the proposed power divider, the divider has been designed and measured at 880 MHz and 1650 MHz dual frequencies. The measured performances of the Gysel divider agree with prediction results at two frequencies.

Deign of Small-Area Dual-Port eFuse OTP Memory IP for Power ICs (PMIC용 저면적 Dual Port eFuse OTP 메모리 IP 설계)

  • Park, Heon;Lee, Seung-Hoon;Park, Mu-Hun;Ha, Pan-Bong;Kim, Young-Hee
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.8 no.4
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    • pp.310-318
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    • 2015
  • In this paper, dual-port eFuse OTP (one-time programmable) memory cells with smaller cell sizes are used, a single VREF (reference voltage) is used in the designed eFuse OTP IP (intellectual property), and a BL (bit-line) sensing circuit using a S/A (sense amplifier) based D F/F is proposed. With this proposed sensing technique, the read current can be reduced to 3.887mA from 6.399mA. In addition, the sensing resistances of a programmed eFuse cell in the program-verify-read and read mode are also reduced to $9k{\Omega}$ and $5k{\Omega}$ due to the analog sensing. The layout size of the designed 32-bit eFuse OTP memory is $187.845{\mu}m{\times}113.180{\mu}m$ ($=0.0213{\mu}m2$), which is confirmed to be a small-area implementation.

A Design and Implementation of Dual-band Monopole Antenna with two arc-shaped line for WLAN applicaiton (WLAN 적용을 위한 두 원호 모양을 갖는 이중 대역 모노폴 안테나의 설계 및 제작)

  • Yoon, Joong-Han
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.6
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    • pp.1049-1056
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    • 2017
  • In this paper, a microstrip-fed dual-band monopole antenna with two arc-shaped lines for WLAN(: Wireless Local Area Networks) applications was designed, fabricated and measured. The proposed antenna is based on a microstrip-fed structure, and composed of two arc-shaped lines and then designed in order to get dual band characteristics. We used the simulator, Ansoft's High Frequency Structure Simulator(: HFSS) and carried out simulation about parameters L2, L5, and with/without slit to get the optimized parameters. The proposed antenna is made of $13.0{\times}34.0{\times}1.0 mm^3$ and is fabricated on the permittivity 4.4 FR-4 substrate($12.0{\times}34.0{\times}1.0mm^3$). The experiment results are shown that the proposed antenna obtained the -10 dB impedance bandwidth 360 MHz (2.29~2.65 GHz) and 1,245 MHz (4.705~5.95 GHz) covering the WLAN bands. Also, the measured gain and radiation patterns characteristics of the proposed antenna are presented at required dual-band(2.4 GHz band/5.0 GHz band), respectively.

Dual T type antenna study for LTE communication (LTE용 이중 T 안테나 연구)

  • Park, Yong-Wook
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.1
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    • pp.7-12
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    • 2015
  • In this paper, we studied the design and fabrication of dual T type antenna to be used in LTE communication systems operating at around 1.8 GHz band. In order to improve of frequency properties of antenna, single feed microstrip patch antenna and CPWG antenna was simulated by HFSS(High Frequency Structure Simulator). The fabricated dual T type antennat showed that the measured center frequency, the minimum return loss and -10dB bandwidth were 1.79 GHz, -23.26 dB and 23 MHz, respectively.

Dual-Mode Balanced Filter in Symmetric Composite Right/Left-Handed Transmission Line Structure (CRLH 전송선로 대칭구조의 이중모드 평형 필터)

  • Kim, Young;Sim, Seok-Hyun;Yoon, Young-Chul
    • Journal of Advanced Navigation Technology
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    • v.17 no.2
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    • pp.196-201
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    • 2013
  • In this paper, a dual-mode balanced filter with symmetric coupled composite right/left-handed transmission line is introduced. Unlike the other symmetric structure, this configuration has the ability to operate under both common- and differential-mode excitation. These properties are achievable through providing physical short circuit by means of ground vias at the center of each unit-cell along the symmetry plane of the structure. Because the CRLH unit-cells are operated under both common- and differential-mode excitation, we implemented a balanced filter using these properties. To validity these features, a five-cell four port coupled CRLH-TL is simulated, fabricated and measured and the obtained performances agree with the simulation results under both common- and differential-mode excitation.

Moving Target Position Detecting System using Dual Line CCD and Photometric Interpolation

  • Ryu, Kwang-Ryol;Kim, Young-Bin
    • Journal of information and communication convergence engineering
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    • v.7 no.3
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    • pp.366-371
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    • 2009
  • A realization for an accurate position detecting system of a moving target in two dimensional plane using dual line CCDs and photometric interpolation is presented. The system is realized that the infrared LEDs are utilized for lighting source, a target size is recognized by the scanned data from CCD owing to blocking the radiated light path by placing the target between CCD and lighting source, a coordinate on the plane is found by plane trigonometry formed by the moving target and two CCD sensors, and the former scan data is used for the coordinate iteratively and the photometric interpolation is applied to sub-pixel of scanned image. The experimental results show that the experiment results in a success rate about 3 different size targets, 3, 5 and 7mmm on the test plane $210{\times}373mm$. The moving target positioning detected success rate is 93% in 3mm target, 5mm is 95.3%, and 7mm is 95.8% respectively. The photometric interpolation is enhanced to 1.5% in comparison to be unused.

Frequency Multiplier Using Diplexer based on CRLH Transmission Line (CRLH 전송선로를 기반으로 한 다이플렉서를 이용한 주파수 체배기)

  • Kim, Seung-Hwan;Kim, Young;Lee, Young-Soon;Yoon, Young-Chul
    • Journal of Advanced Navigation Technology
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    • v.14 no.1
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    • pp.66-73
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    • 2010
  • This paper proposes the frequency multiplier using diplexer based on CRLH transmission line with dualband characteristic. The diplexer is separated the output signals of harmonic generator, which is generated the harmonic signals using nonlinear device. The diplexer consists of the inphase power divider, 0o/90o phase controller and dual-band quadrature hybrid coupler. This send out the selecting output signals of the harmonic signals and suppresses out of signals. To validate a function of multiplier, the harmonic generator and diplexer with 2 GHz and 3 GHz operating frequency range is implemented. As a result, the proposed frequency multiplier is operated normally.

An Unequal Dual-Band Lumped Element Power Divider (비대칭 이중대역 집중소자 전력분배기)

  • Yoo, Jae-Hyun;Kim, Young;Yoon, Young-Chul
    • Journal of Advanced Navigation Technology
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    • v.15 no.4
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    • pp.578-584
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    • 2011
  • This paper presents the design and measured performances of an unequal dual-band power divider using lumped elements. After the divider is designed using the conventional single band Wilkinson topology with lumped elements, we obtained the dual band characteristics with filter conversion method. This design method has the features of compact size and easy fabrication, because the high impedance transmission line realizes the lumped elements of equivalent circuit. As an example, an 2:1 divider has been designed and measured at 880 MHz and 1650 MHz in order to show the validity of the proposed unequal divider. The measured performances of the unequal power divider agree with the simulation results.

Dual-Band Antenna Design for LTE/Wi-Fi for Maritime Broadband Communication (해상 광대역 통신을 위한 LTE/Wi-Fi용 이중대역 안테나 설계)

  • Oh, Mal-Geun
    • Journal of Advanced Navigation Technology
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    • v.22 no.6
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    • pp.665-669
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    • 2018
  • In this paper, we design an antenna for LTE / Wi-Fi communication that operates in 2.65 GHz and 5 GHz band for small-sized broadband communication antenna that can be used in the sea. Microstrip patch antennas were chosen to improve the bandwidth. The slot width, length, and transmission line width were calculated using the theoretical formula for each step. In addition, we designed a microstrip antenna using CST Microwave Studio 2014 program that can design 3D. Simulation results show that the reflection lossis -12.712 dB at 2.65 GHz and -16.583 dB at 5 GHz. The gain was 1.738 dBi at 2.65 GHz and 3.284 dBi at 5 GHz. In this paper, we propose a dual-band antenna for LTE / Wi-Fi, which can be used in maritime environments, which is worse than terrestrial communication, because of differences in communication speed and communication stability compared with those used on land.