• Title/Summary/Keyword: Transmission Line (TL)

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A Resonance Power Combining Technique Using CRLH-Transmission Line (CRLH 전송 선로를 이용한 공진 기법의 전력 결합 기술)

  • Kim, Ell-Kou;Kim, Young;Kwon, Sang-Keun;Yoon, Young-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.8
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    • pp.673-679
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    • 2009
  • This paper proposes a resonance power-combining technique using CRLH-transmission line. The circuits using proposed technique consist of the parallel capacitances and transmission lines to satisfy matching conditions and to combine power of amplifiers. The CRLH(Composite Right/Lefi-Handed) transmission lines are used to reduce the circuit size. As a result, the power combining amplifier using proposed techniques is measured that a gain is equal and the output power is increased about 2.2 dB higher than the single amplifier. Also, a size of amplifier is 78.3 % smaller than the conventional amplifier using RH transmission line.

Dual-Wideband Bandpass Filter Using Distributed Composite Right/Left-Handed Transmission Line Quad-Mode Resonators (분산 CRLH 전송선로 4중 모드 공진기를 이용한 이중-광대역 대역통과 여파기 설계)

  • Sung, Gyuje;Kim, Young
    • Journal of Advanced Navigation Technology
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    • v.21 no.1
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    • pp.84-89
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    • 2017
  • This paper presents a dual-wideband bandpass filter (BPF) with high band-to-band isolation and skirt selectivity using distributed composite right/left-handed (CRLH) transmission line (TL) quad-mode resonators (QMRs). The results of the proposed distributed CRLH TL unit cell analysis are used to establish the scattering parameters and the resonance frequencies of the QMR constituting the dual-wideband BPF. A novel dual-wideband bandpass filter is designed and fabricated, using the derived scattering characteristics. The measured results show that the fabricated dual-wideband bandpass filter has an insertion loss of less than 1.08dB in the lower band, and of 2.01dB in the upper band, a bandwidth of 2.8-5.52GHz and 9.68-12.26GHz, and a band-to-band isolation of more than 38dB, from 6.34-8.42GHz.

Design of a Compact Wilkinson Power Divider Using Meta-Material Lines (Meta-Material을 이용한 소형 Wilkinson 전력 분배기 설계)

  • Kim, Jeong-Pyo;Kim, Gi-Ho;Yang, Myo-Geun;Seong, Won-Mo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.10 s.113
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    • pp.953-958
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    • 2006
  • A compact Wilkinson power divider with meta-material transmission line(MM-TL) is proposed. The divider is designed by adding the MM-TL with $+90^{\circ}$ phases shifting instead of the ${\lambda}_g/4$ with $-90^{\circ}$ phases shifting at a simple Wilkinson power divider. The MM-TL consists of three phase shifter unit cells and each cell has the characteristics of the $30^{\circ}$ phases shilling and 6 mm length. Therefore, the length of ${\lambda}_g/4(210 mm)$ TL with $-90^{\circ}$ phases shifting at a simple Wilkinson power divider can be reduced to 18 mm and the Wilkinson divider is very compact.

Modeling and Characterization of Low Voltage Access Network for Narrowband Powerline Communications

  • Masood, Bilal;Haider, Arsalan;Baig, Sobia
    • Journal of Electrical Engineering and Technology
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    • v.12 no.1
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    • pp.443-450
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    • 2017
  • Nowadays, Power Line Communication (PLC) is gaining high attention from industry and electric supply companies for the services like demand response, demand side management and Advanced Metering Infrastructure (AMI). The reliable services to consumers using PLC can be provided by utilizing an efficient PLC channel for which sophisticated channel modeling is very important. This paper presents characterization of a Low Voltage (LV) access network for Narrowband Power Line Communications (NB-PLC) using transmission line (TL) theory and a Simulink model. The TL theory analysis not only includes the constant parameters but frequency selectivity is also introduced in these parameters such as resistance, conductance and impedances. However, the proposed Simulink channel model offers an analysis and characterization of capacitive coupler, network impedance and channel transfer function for NB-PLC. Analysis of analytical and simulated results shows a close agreement of the channel transfer function. In the absence of a standardized NBPLC channel model, this research work can prove significant in improving the efficiency and accuracy of NB-PLC communication transceivers for Smart Grid communications.

Design of a Micro-strip Patch Array Antenna using CRLH Transmission Line Power Divider Supporting Infinite Wavelength (무한파장 전파특성을 갖는 CRLH 전송선로 전력 분배기를 이용한 마이크로스트립 패치 배열 안테나의 설계)

  • Kim, Jung-hyung;Lee, Hong-min
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.3 no.2
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    • pp.39-45
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    • 2010
  • In this paper, an equally spaced $3{\times}2$ microstrip patch array antenna based on the fundamental infinite wavelength supported by the composite right/left-handed (CRLH) transmission line (TL) is proposed. The proposed CRLH TL unit cell consists of an inter-digit capacitor to realize left-handed (LH) series capacitance and non-symmetric shunt meander line with a shorted via to realize LH shunt inductance. At the infinite wavelength frequency of 2.09 GHz a 6-port series power divider consisting of a 19 unit cells shows a maximum magnitude difference of 0.73 dB and a $0.52^{\circ}$ maximum phase difference between output ports. The measured resonant frequency and maximum gain of the fabricated array antenna is 2.09 GHz and 10.98 dBi, respectively.

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Design of the Miniaturized UWB BandPass Filter Using the 1 Unit of CRLH-TL (일단 CRLH 전송선 구조를 이용한 소형 초광대역 대역 통과 여파기의 설계)

  • Ju, Jeong-Ho;Kahng, Sung-Tek
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.12
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    • pp.1402-1407
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    • 2007
  • This paper presents a new design method of the Ultra-Wide-Band BandPass Filter using the CRLH-TL(Composite Right- and Left-Handed Transmission-line) having the Metamaterials' properties. Instead of the periodic type or many cells of the CRLH-TL, only the unit cell is used to miniaturize the target component, which can not be realized by the conventional quarter guided-wavelength resonator-based filters. Particularly, the strong coupling essential to the Ultra Wide Band is enabled by the interdigital coupled lines between the grounded stubs. The proposed design scheme is validated by the electromagnetic simulation and measurement of the fabricated filter which shows the total size of 'the guided-wavelength/9.4', the 100 % fractional bandwidth for the UWB, the insertion loss of less than 1 dB and the flat group-delay.

GA-Optimized Compact Broadband CRLH Band-Pass Filter Using Stub-Inserted Interdigital Coupled Lines

  • Jeon, Jinsu;Kahng, Sungtek;Kim, Hyunsoo
    • Journal of electromagnetic engineering and science
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    • v.15 no.1
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    • pp.31-36
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    • 2015
  • The design of a new compact band-pass filter is proposed, which is based on the microstrip composite right- and left-handed transmission- line (CRLH-TL) structure. Particularly, the interdigital coupled (IDC) lines of the CRLH geometry are proposed to be parted by inserting open stubs to meet the specifications on the passband. In addition, there is another pair of stubs to complete the design in a limited space. These are considered in the TL-based analysis and the design parameters are calculated by genetic algorithm optimization. The measurement is shown to be acceptable and agreeable with the circuit and electromagnetic field simulations. In addition, the zerothorder resonance (ZOR) phenomenon is verified.

An Optimal Design of the Compact CRLH-TL UWB Filter Using a Modified Evolution Strategy Algorithm

  • Oh, Seung-Hun;Wu, Chao;Chung, Tae Kyung;Kim, Hyeong-Seok
    • Journal of Electrical Engineering and Technology
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    • v.10 no.2
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    • pp.653-658
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    • 2015
  • This paper deals with an efficient optimization design method of a compact ultra wideband (UWB) filter which can improve the characteristics of the filter. The Evolution Strategy (ES) algorithm is adopted for the optimization and modified to suppress the ripple by inserting an additional step to the ES scheme. The algorithm has the ability to control the ripple of an insertion loss in a passband as a modified approach. During the modified ES, a structure of initial shape is changed a lot, while includes the stepped impedance (SI) and the composite right/left handed transmission line (CRLH-TL). And an optimized filter satisfies the UWB specifications on the stopband and passband with an acceptable insertion loss. The filter achieves a much developed shape, the size of $15{\times}14mm$, the 3dB bandwidth from 2.7 to 10.8GHz, the flat insertion-loss less than 1dB, the wide stopband with 12~20GHz, and an acceptable return loss.

Design of the UWB BandPass Filter of Microstrip CRLH-TL Metamaterial Cell Type with Improved Rejection Performance (저지특성이 향상된 CRLH-TL Metamaterial 쎌 형 UWB 대역통과여파기의 설계)

  • Kahng, Sung-Tek;Ju, Jeong-Ho
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.8
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    • pp.47-52
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    • 2008
  • In order to enhance the rejection performance of the UWB bandpass filter based on the Composite Right- and Left-Handed Transmission-line(CRLH-TL) Metamaterial cell, we propose the lowpass filtering concept that fits into the design objectives : Keeping metamaterial property and miniaturization. So the bandpass filter itself is made far less than a quarter-wavelength and a pair of symmetric comprises lowpass filtering blocks are placed before and after the center CRLH filter which comprises tile interdigitated coupled lines and short-circuited stob. The design result will show the size of 'guided wavelength/8', the fractional bandwidth over 100%, the insertion loss much less than 1 dB, a flat Group-Delay and a good return loss performance, as expected.

Attenuator using Lossy Left-Handed Transmission Line and Vector Modulator Application (손실이 있는 Left-Handed 전송선로를 이용한 감쇠기와 벡터 변조기 응용)

  • Kim, Seung-Hwan;Kim, Ell-Kou;Kim, Young;Yoon, Young-Chul
    • Journal of Advanced Navigation Technology
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    • v.13 no.3
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    • pp.399-405
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    • 2009
  • This paper proposes a design of attenuator based on meta-material structure and its application. The unit-cell attenuator based on the lossy transmission line consists of the CRLH(Composite Right/Left Handed) transmission line and PIN diodes to be controlled internal loss according to diode bias voltage to change resistance of diode. Also, to reduce the initial losses, there is used parallel connection of PIN diodes. To increase attenuations, it is connected a cascade unit-cell of attenuator with periodic structure. The attenuation quantities of unit-cell are about 10dB and phase variations are 15o maximum at 1.5 GHz ~ 2.5 GHz. Also, its application is represented a vector modulator.

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