• Title/Summary/Keyword: 결합 선로

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A Study on Compound Technique for Increasing the Bandwidth of Microstrip Antennas using the Paralle Coupled Lines (평행 결합 선로를 이용한 복합 광대역 기법 적용 마이크로스트립 안테나에 관한 연구)

  • 김정일;한만군;윤영중
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.5
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    • pp.713-721
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    • 2001
  • In this paper, parasitic patches gap-coupled microstrip antenna and stacked microstrip patch antenna combined with parallel coupled lines, which are a kind of wideband impedance matching network, are proposed to get the wider bandwidth. The iterative method using a distributed network is proposed to design the parallel coupled lines as a wideband impedance matching network. Measurements show that the proposed antennas provide wider bandwidths ~1.6 times and ~1.5 times those of conventional parasitic gap-coupled microstrip patch antenna and stacked microstrip patch antenna. In addition, measured radiation patterns show no serious variation of radiation patterns though the parallel coupled lines is added. The antenna gain is, however, lowered about 1 dB and 0.5 dB by the coupling loss in the parallel coupled lines.

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A Design of Multiple Microstrip Line Coupled Circuit for Microwave Integrated Circuit (마이크로파 집적회로를 이용한 복수 마이크로스트립선 결합회로의 설계)

  • Park, Yhl;Kang, Hee-Chang;Chin, Youn-Kang
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.16 no.9
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    • pp.862-876
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    • 1991
  • In this theses, the procedure for finding the equivalent immittance of an n-line coupled structures is presented in terms of the normal mode parameters of the n-line coupled system. The above generalized equations can be applied to the various Coupled structures including directional couplers, DC blocks, bandpass/band elimination filters, and various other uniformly coupled filters. The design equations are based on a simplified TEM(Quasi TEM) mode. The obtained results and the definition of the scattering parameters for a general coupled line four port with arbitrary terminations are used to present the procedure to determine the optimum physical dimensions matching the given load impedances connected to input, output port. Multiple coupled rnicrostrip two-port with three lines circuit designed shows little discrepancy between the conventional method and this one. Four port with five lines were fabricated on teflon substrate($e$r=2.55) with its thickness h=l.588mm designed at the center frequency, 4 GHz. Their measured results are fairly close to the ones by computation.

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The Directional Coupler Using the Vertical Coupling Structure (수직 결합 구조를 이용한 방향성 결합기)

  • Yun, Tae-Soon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.3
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    • pp.445-450
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    • 2017
  • In this paper, the directional coupler with half-power division is designed and fabricated by using the vertical coupling structure based on the CPW transmission-line. Even-mode and odd-mode of the vertical coupling structure can be analyzed by the conventional CPW-line and the CBCPW-line, respectively, with half thickness of the substrate. The directional coupler is designed by using the tefron substrate with the dielectric constant of 2.55 and the thickness of 0.76mm. Manufactured directional coupler has the center frequency of 2.45 GHz and the bandwidth of 66.1%. Also, the return loss and isolation are 19.52dB and 19.47dB, respectively, at the center frequency.

Correction Method of the Hydrogen Bond-Distance from X-ray Diffraction: Use of Neutron Data and Bond Valence Method (X-선 회절로 얻은 수소결합의 결합거리 보정 방법: 중성자 회절결과와 결합원자가 방법 이용)

    • Journal of the Mineralogical Society of Korea
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    • v.16 no.1
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    • pp.65-73
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    • 2003
  • In this study we have derived the two correction methods of hydrogen bonding distance. In case of the intermediate or long hydrogen bond(>2.5 $\AA$), hydrogen bonding distances can be corrected by using the function d(O-H)=exp((2.173-d(O…O))/0.138)+0.958 obtained by least- squares fit to the data from the neutron diffraction at low temperatures. The valence-least-squares method is effective for the distance correction of very short hydrogen bond(<2.5 $\AA$). The distance correction is necessary for the long intermolecular hydrogen bond obtained from X-ray diffraction analysis.

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.

Synthesis of Marchand Balun Using Planar Coupled-Line (결합 선로를 이용한 평판 구조의 Marchand 발룬의 합성)

  • Lee Jong-Hwan;Yeom Kyung-Whan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.2 s.93
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    • pp.161-166
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    • 2005
  • The synthesis procedure of Marchand balun using planar coupled-line is presented. The design limitations of this type of balun have been described before its synthesis procedure. The balun has equi-ripple passband responses and balanced output without fourth balanced transmission line which is difficult to implement with conventional planar topology. As an example, 2:1 Marchand balun is designed and its momentum simulation result show good verification fur this methodology.

The Design of High-Temperature Superconducting Microstrip Filter Using Multiple Coupled Line Resonators (다중 결합 선로 공진기를 이용한 고온초전도 마이크로스트립 여파기의 설계)

  • Park, Hee-Chan;Yun, Seok-Sun;Park, Ik-Mo;Kim, Tae-Il;Kim, Sang-Kyoon;Min, Byoung-Chul;Jang, Jeong-Pil;Lee, Haeng-Seon;Choi, Young-Hwan;Oh, Byung-Du
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.38 no.5
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    • pp.23-31
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    • 2001
  • A very compact narrowband high-temperature superconducting microstrip filter using multiple coupled line resonators is designed and fabricated to effectively use the limited space of the wafer. The fabricated 12 pole filter has a center frequency of 1.79 GHz and a 3dB bandwidth of 7.63 MHz(0.43% fractional bandwidth). The filter also shows sharp skirt characteristics of 71 dB/MHz and 41dB/MHz blow and above the passband, respectively, and has an insertion loss of less than 0.5dB and a return loss of more than 15dB in the passband.

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Gamma Irradiation for the Inhibition of Shrimp (Penaeus aztecus) Allergy (새우(Penaeus aztecus)의 알러지 억제를 위한 감마선 조사)

  • 김재훈;이주운;육홍선;김정옥;변명우
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.29 no.3
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    • pp.437-441
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    • 2000
  • 감마선 조사기술을 이용하여 새우 알러지를 감소시키기 위해 본 연구를 실시하였다. 감마선 조사구(A), 감마선 조사후 가열처리구(B), 가열처리 후 감마선 조사구(C)로 실험구를 설정하고 1,3,5,7,10 kGy의 감마선을 조사하여 실험에 사용하였다. A 처리구로부터 새우의 근혈장 단백질 용액과 근섬유 단백질 용액을 준비하였고, B와 C처리구에서도 각각의 단백질 용액을 준비하였다. 각 단백질 용엑에 대한 환자 IgE와 mAb 4.9.5의 결합력을 ELISA로 조사하였다. 두 항체 모두 감마선 조사구의 단백질을 용액과의 결합력이 감마선 조사선량이 증가할수록 낮게 나타났고, 감마선 조사후 가열처리가 항체의 결합력을 감소시키는데 더 효과적이었다. SDS-PAGE 결과 감마선 조사된 새우 단백질의 전기영동적 분리 pattern에는 변화가 없었다. 이 결과는 적절한 선량의 감마선 조사가 새우 알러지를 감소시킬 수 있다는 것을 시사한다.

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High Directivity Microstrip Directional Coupler using Interdigital Capacitors (인터디지털 커패시터를 이용한 높은 지향성을 갖는 마이크로스트립 방향성 결합기)

  • Dae-Hyun Han
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.17 no.1
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    • pp.10-16
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    • 2024
  • Microstrip directional couplers using microstrip lines do not have good directivity characteristics because the dielectric constant of the substrate is different from that of air. To solve this problem, a compensation capacitor is sometimes attached between the coupling lines to improve directivity. This paper proposes a directional coupler with high directivity using interdigital capacitors implemented with transmission lines instead of lumped capacitors. The directional coupler designed and fabricated using the proposed method showed a coupling factor of 20 dB and a directivity of higher than 30 dB at 2.14 GHz. This directional coupler can be used as two directional couplers because it has two coupling ports and two isolated ports.

Design and fabrication of PSK carrier recovery circuit using multi-layer coupled line (다층형 결합 선로를 이용한 반송파 복원 회로 설계 제작)

  • Kim, Young-Wan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.10
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    • pp.2039-2044
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    • 2009
  • The PSK carrier signal recovery circuit using multi-layer coupled line was analyzed and designed. The fabricated carrier recovery 6 port element with multi-layer coupled line structure gets the simple architecture. It is possible to implement the carrier signal recovery circuit of the same structure with the multi-layer six port phase correlator of the direct receiver front-end. Based on the analysis of RML carrier recovery circuit using the multi-layer coupled line 6-port phase correlator, the multi-layer coupled line carrier signal recovery structure for multi-mode coherent demodulation was proposed. The fabricated multi-layer coupled line carrier signal recovery circuit for quadrature phase shift-keying shows a good carrier signal characteristic with a constant phase and phase error below ${\pm}3o$.