• 제목/요약/키워드: Right handed

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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.

Design of A Dual Band Branch Line Coupler Using a CRLH Transmission Line Structure (CRLH 전송선로 구조를 이용한 이중대역 브랜치 라인 커플러 설계)

  • Park, Min-Woo;Koo, Ja-Kyung;Lim, Jong-Sik;Jeong, Yong-Chae;Ahn, Dal
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2462-2467
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    • 2009
  • This paper proposes a dual band branch line coupler (BLC) using a composite right/left handed (CRLH) transmission line. The existing dual band BLCs with open stubs require hundreds of line impedance for the open stub as the frequency bands approach to each other, so it has been almost impossible to realize them. However in the proposed BLC, a CRLH transmission line replaces the open stub with an extremely high line impedance so that the BLC circuit may be realized even two frequencies are close to each other. As an example, a dual band BLC operating at 1800MHz and 2300MHz (the frequency ratio is 1:1.28) is designed and measured. Open stubs with $560\Omega$ line impedance are replaced by CRLH transmission lines for realizing the dual band BLC. The measured performances prove that the dual band operation is well acceptable and the proposed design method is successful even the ratio between two frequencies is not around two nor more.

GPS and Wireless LAN Bandpass Filter based on LTCC (LTCC를 이용한 GPS와 WLAN 대역통과 여파기)

  • Kim, Young;Yun, Jeong-Ho
    • Journal of Advanced Navigation Technology
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    • v.16 no.2
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    • pp.227-233
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    • 2012
  • This paper presents a bandpass fitler of GPS and WLAN band based on LTCC. The structure of bandpass fitler consists of a Butterworth lowpass fitler and highpass filter using CRLH (Composite Right/Left-Handed) transmission line. Using green sheet with dielectric constant 7.2, we fabricated the bandpass filter that satisfied GPS and WLAN band characteristics. We are implemented the bandpass filter at center frequency 1.5 GHz (GPS) and 2.4 GHz (WLAN). Its insertion loss are 1.66 dB at GPS and 3.20 dB at WLAN respectively.

Kinematic characteristics of the ankle joint and RPM during the supra maximal training in cycling (사이클링 초최대운동(Supra maximal training)시 RPM과 족관절의 운동학적 분석)

  • Lee, Yong-Woo
    • Korean Journal of Applied Biomechanics
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    • v.15 no.4
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    • pp.75-83
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    • 2005
  • The purpose of this study was to determine the kinematic characteristics of the ankle joint and RPM(repetition per minutes) during the supra maximal training in cycling. For this study, 8 national representative cyclists, distance cyclists in track and road, were selected. During the super-maximum pedalling, kinematic data were collected using a six-camera(240Hz) Qualisys system. the room coordinate system was right-handed and fixed in the back of a roller for cycle, with right-handed orthogonal segment coordinate systems defined for the leg and foot. Lateral kinematic data were recorded at least for 3 minutes while the participants pedal on a roller. Two-dimensional Cartesian coordinates for each marker were determined at the time of recording using a nonlinear transformation technique. Coordinate data were low-pass filtered using a fourth-order Butterworth recursive filter with cutoff frequency of 15Hz. Variables analyzed in this study were compared using a one factor(time) ANOVA with repeated measures. The results of investigation suggest that the number of rotating pedal was decreased with time phase during the super-maximum pedaling. Maximum angle of the ankle joint showed little in change with time phase compared with minimum angle of that.

A Triple-Band Voltage-Controlled Oscillator Using Two Shunt Right-Handed 4th-Order Resonators

  • Lai, Wen-Cheng;Jang, Sheng-Lyang;Liu, Yi-You;Juang, Miin-Horng
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.16 no.4
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    • pp.506-510
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    • 2016
  • A triple-band (TB) oscillator was implemented in the TSMC $0.18{\mu}m$ 1P6M CMOS process, and it uses a cross-coupled nMOS pair and two shunt $4^{th}$ order LC resonators to form a $6^{th}$ order resonator with three resonant frequencies. The oscillator uses the varactors for band switching and frequency tuning. The core current and power consumption of the high (middle, low)- band core oscillator are 3.59(3.42, 3.4) mA and 2.4(2.29, 2.28) mW, respectively at the dc drain-source bias of 0.67V. The oscillator can generate differential signals in the frequency range of 8.04-8.68 GHz, 5.82-6.15 GHz, and 3.68-4.08 GHz. The die area of the triple-band oscillator is $0.835{\times}1.103mm^2$.

Modeling and analysis of radiation effects for 1-D RLH-TL (1차원 RLH-TL 방사효과 모델링 및 해석)

  • Moon, Hyo-Sang;Lee, Bom-Son
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.12
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    • pp.8-15
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    • 2007
  • This paper presents the radiation rate formula due of a inclusion of a series capacitor and shunt inductor in a unit cell for the right/left-handed transmission line (RLH-TL). The equivalent circuit for a RLH unit cell considering radiation effects is presented and analyzed in terms of the Bloch impedance and dispersion diagram. It has been found that when two radiation rates are identical, the Blockimpedance reduces to the characteristic impedance of the host conventional RH-TL. Besides, design equations for a unit cell for a specific phase shift at a given frequency are provided. The method of realizing uniform excitation along the RLH-TL is also proposed for antenna applications.

A Wilkinson-Type Balun Using a Composite Right/Left-Handed Transmission Line

  • Park, Unghee
    • Journal of information and communication convergence engineering
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    • v.11 no.3
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    • pp.147-152
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    • 2013
  • A novel balun being the structure of a Wilkinson power divider is suggested and fabricated. One of the power dividing paths in the suggested balun uses a conventional ${\lambda}/4$ transmission line for $-90^{\circ}$ phase shifting, and the other path uses a composite right/left-handed -${\lambda}/4$ transmission line for $+90^{\circ}$ phase shifting with four series capacitors and three parallel inductors. In addition, the suggested balun uses two $50-{\Omega}$ resistors and a conventional $50-{\Omega}$ transmission line of ${\lambda}/2$ electrical length between the two output ports, achieving good isolation and reflection values of two balanced ports. The suggested balun is simulated by the advanced design system simulation program and fabricated on TLX-9 20-mil substrate. The fabricated balun has a very good values of $S_{11}$ = -27.46 dB, $S_{21}$ = -3.40 dB, and $S_{31}$ = -3.28 dB, a phase difference of $-179.5^{\circ}$, a magnitude difference of 0.12 dB, and a delay difference of 0.1 ns, with $S_{22}$ = -36.28 dB, $S_{33}$ = -27.19 dB, and $S_{32}$ = -25.2 dB at 1 GHz, respectively.

The Study of Muscle Activity for the Upper Extremity over Morto-Seoinage(Two-handed shoulder throw) in Judo (유도 양손 업어치기 시 상지근의 근 활성도에 관한 연구)

  • Kim, Ji-Tae;Cho, Young-Je;Lee, Deck-Young
    • Korean Journal of Applied Biomechanics
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    • v.17 no.3
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    • pp.95-103
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    • 2007
  • The purpose of this study is Muscle Activity for the Upper Extremity and Morto-Seoinage(Two-handed shoulder throw) according to performance levels and elite judo players (G1) and non-elite judo players, namely university players (G2). To achieve this purpose, three players in G1 whose main special skill was Morote-Seoinage and three university judo players(G2) were selected as comparative group. After analysing this study, conclusions were derived as follows. 1. Muscle activity of musculi membri superious to group of Kuzushi to Tsukuri was the highest in left biceps brachii and right biceps brachii in order. On the other hand, G2 was the highest in left biceps brachii and left flexer carpi randialis in order. 2. Intergral electromyogram of according to the phase showed right triceps 1P of left flexer carpi radialis. G1 and G2 of showed left biceps brachii was the highest in 1P and 2P. As a result, extra training of left flexer carpi radialis and left biceps brachii is needed.

How Z-DNA/RNA binding proteins shape homeostasis, inflammation, and immunity

  • Kim, Chun
    • BMB Reports
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    • v.53 no.9
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    • pp.453-457
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    • 2020
  • The right-handed double-helical structure of DNA (B-DNA), which follows the Watson-Crick model, is the canonical form of DNA existing in normal physiological settings. Even though an alternative left-handed structure of DNA (Z-DNA) was discovered in the late 1970s, Z-form nucleic acid has not received much attention from biologists, because it is extremely unstable under physiological conditions, has an ill-defined mechanism of its formation, and has obscure biological functions. The debate about the physiological relevance of Z-DNA was settled only after a class of proteins was found to potentially recognize the Z-form architecture of DNA. Interestingly, these Z-DNA binding proteins can bind not only the left-handed form of DNA but also the equivalent structure of RNA (Z-RNA). The Z-DNA/RNA binding proteins present from viruses to humans function as important regulators of biological processes. In particular, the proteins ADAR1 and ZBP1 are currently being extensively re-evaluated in the field to understand potential roles of the noncanonical Z-conformation of nucleic acids in host immune responses and human disease. Despite a growing body of evidence supporting the biological importance of Z-DNA/RNA, there remain many unanswered principal questions, such as when Z-form nucleic acids arise and how they signal to downstream pathways. Understanding Z-DNA/RNA and the sensors in different pathophysiological conditions will widen our view on the regulation of immune responses and open a new door of opportunity to develop novel types of immunomodulatory therapeutic possibilities.

A Tip for Crystallographic Unit Cell Transformation Verified by a Chiral Compound $[C_{24}H_{22}N_4O_4S]_2HCl$ (Chiral Compound $[C_{24}H_{22}N_4O_4S]_2HCl$로 확인한 결정학적 단위포 변환시의 한 조언)

  • Suh, Il-Hwan;Kim, Jin-Gyu;Park, Ji-Cheol;Park, Young-Soo;Park, Kyung-Lae
    • Korean Journal of Crystallography
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    • v.11 no.2
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    • pp.89-94
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    • 2000
  • A crystallographic unit cell can be transformed into another one by a 3×3 transformantion matrix. If the determinant of the transformation matrix has a negative value, the newly transformed unit cell becomes a left-handed cell. The best way of transforming the left-handed cell to the right-handed one is to multiply each element of the transformation matrix by-1, and its corresponding transformation matrix must be applied tot he atomic coordinates of a noncentrosymmetric crystal so as to maintain the absolute configuration unchanged. The behaviour of absolute configuration caused by transforming the crystallographic unit cell was examined theoretically and experimentally on the compound (S)-(+)-4-phenyl-1-[4-aminobenzoyl) indoline-5-sulfonyl]-4,5-dihydro-2-imidazolone hydrochloride.

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