• Title, Summary, Keyword: even-odd mode theory

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An Analysis Method of Lumped-element Directional Coupler for CATV by Even- and Odd-Mode Theory (CATV용 집중정수형 방향성결합기의 우기모드 해석법)

  • Ha, Do-Hoon;Kim, Dong-Il
    • Journal of the Korean Institute of Navigation
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    • v.25 no.2
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    • pp.131-136
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    • 2001
  • A new analysis method of lumped-element directional coupler for CATV was proposed, where the even-and odd-mode theory for a symmetrical coupled-line directional coupler was applied to a transformer-type directional coupler. In addition, the tap-offs were analyzed by the proposed theory, which are widely used in CATV (Cable Television) systems. By comparing the calculated results for S-parameters results to the measured ones using only the even-and odd-mode reflection coefficients, the validity of the proposed analysis method was confirmed. Then, it was clearly shown that the tap-off has very wide bandwidth from 5 MHz to 4,000 MHz by adopting the proposed theory.

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A Study on Analysis Method of Tap-Offs for CATV/DBS/CS by Even.Odd-Mode Theory (CATV/DBS/CS용 신호분기기의 우.기 모드 해석법)

  • 김동일;황재현;류현욱;하도훈;정세모
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.3
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    • pp.346-351
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    • 2001
  • A new analysis method was proposed, where the even . odd-mode theory for a symmetrical coupled-line directional coupler was applied to a transformer-type directional coupler. In addition, the tap-offs were analyzed by the proposed theory, which are widely used in CATV (Cable Television), DBS (Direct Broad- casting Satellite), CS (Communication Satellite) systems. By comparing the calculation results to the measured ones using the even . odd-mode reflection coefficients only, the validity of the proposed analysis method was confirmed. Then, the tap-off has been broadened from 5 MHz over 4,000 MHz by adopting the proposed theory.

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Tri-band Microstrip Bandpass Filter Using Dual-Mode Stepped-Impedance Resonator

  • Liu, Haiwen;Lei, Jiuhuai;Zhao, Yulong;Xu, Wenyuan;Fan, Yichao;Wu, Tiantian
    • ETRI Journal
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    • v.35 no.2
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    • pp.344-347
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    • 2013
  • This letter presents a compact dual-mode tri-band bandpass filter by using a short-circuited stub-loaded stepped-impedance resonator (SIR) and a short-circuited stub-loaded uniform impedance resonator. Also, a hairpin SIR geometry is introduced to miniature the size of this filter while maintaining excellent performance. The use of a short-circuited stub at the central point of the hairpin SIR can generate two resonant modes in two passbands. Its equivalent circuit structure is analyzed by using the even-odd mode theory. For demonstration purposes, a tri-band filter for the applications of the Global Positioning System at 1.57 GHz, Worldwide Interoperability for Microwave Access at 3.5 GHz, and wireless local area networks at 5.2 GHz is designed, fabricated, and measured.

An Even\ulcornerOdd mode Analysis Method of Tap-Offs for CATV/DBS Systems (CATV/DBS용 신호분기기의 우ㆍ기 모드 해석법)

  • 김동일;황재현;류현욱;하도훈;정세모
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.156-159
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    • 2000
  • A new analysis method of Tap-Off for CATV, DBS, CS systems was proposed and investigated by using 4-port and Lport equivalent circuits. As an analysis method the even$.$odd-mode theory for a symmetrical coupled-line directional coupler was introduced, and then it was applied to transformer type directional couple By comparing the results of simulation and measurement, the validity of the proposed analysis method was confirmed. Furthermore, the Tap-off has been broadened from 5 MHz to 4,000 MHz by adopting the propose theory.

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Lumped/Distributed Hybrid Element Directional Coupler with Reduced Size Based on Parallel Coupled-Line Theory (평형결합선로 이론을 이용한 소형화된 집중/분포소자 방향성 결합기)

  • 김영태;박준석;정명섭;임재봉
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.153-156
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    • 2002
  • In this paper, we have designed a small size lumped/distributed hybrid element directional coupler using parallel coupled-line theory. a hybrid lumped equivalent circuit for a conventional parallel directional coupler is proposed. The equivalent circuit and design formula for the presented lumped element coupler are derived based on the even- and odd-mode properties of a parallel-coupled line. By using the derived design formula, we have extracted design parameters and designed the 3㏈ and 10㏈ small size lumped element directional couplers at the center frequency of 2Ghz. Excellent agreements between design theory and simulation on the designed directional couplers show the validity of this paper.

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Extraction Solution for the Coupling Coefficient at the Magnetically Coupled Wireless Power Transmission (자계 결합 무선 전력 전송에서의 결합 계수 추출 방법)

  • Kim, Gun-Young;Lee, Bom-Son
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.9
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    • pp.1073-1078
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    • 2012
  • This paper presented the extraction solution for the coupling coefficient at the magnetically coupled wireless power transmission(WPT) system through the analysis of its equivalent circuit considering the loss. The conventional extraction solution using coupled mode theory is generalized employing the extracted solution considering the load resistance. Consequently, the measuring process of extracting coupling coefficient becomes convenient since the even/odd mode analysis is not necessary. Furthermore, the coupling coefficient obtained from the induced extraction method was in excellent agreement with the coupling coefficient obtained using the ratio of magnetic flux passing through the two loops. The extraction of the accurate coupling coefficient at the magnetically coupled WPT is an essential work to analyze and optimize the WPT system.

A Coupled-Line Type Waveguide Bandpass Filter using Normalized Impedance Concept

  • Park, Jun-Seok;Kim, Young-Tae;Kim, Sun-Hyeong;Lim, Jae-Bong;Cho, Hong-Goo
    • Journal of electromagnetic engineering and science
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    • v.3 no.2
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    • pp.126-132
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    • 2003
  • In this paper, a coupled-line type waveguide bandpass filter is newly proposed. The proposed bandpass filter configuration consists of magnetically coupled waveguide cavities. In order to show the background of the proposed waveguide bandpass filter, the general coupled line TEM bandpass filter theory, which means the coupled line filter with arbitrary coupled line length and impedance level, will be briefly introduced. Calculations for the even- and odd-mode wave impedance of a coupled line waveguide structure are achieved based on the normalized impedance concept for a broad-side coupled waveguides by using vector finite element method(VFEM) calculation. Measured result of an implemented coupled-line type waveguide filter is presented.

Design of a Novel Lumped Element Backward Directional Coupler Based on Parallel Coupled-Line Theory (평행 결합선로 이론에 근거한 새로운 집중 소자형 방향성 결합기 해석 및 설계)

  • 송택영;이상현;김영태;천창율;박준석
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.157-160
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    • 2002
  • In this paper, a novel lumped equivalent circuit for a conventional parallel directional coupler is proposed. The equivalent circuit and design formula for the presented lumped element coupler is derived based on the even-and odd-mode properties of a parallel-coupled line. By using the derived design formula, we have designed the 3㏈ and 10㏈ lumped element directional couplers at the center frequency of 100Mhz. Furthermore, a chip type directional coupler has been designed to fabricate with multilayer configurations by employing the Low Temperature CofiredCeramic (LTCC) process. Designed chip-type directional coupler has a 10㏈-coupling value at the center frequency of 2㎓. Excellent agreements between simulations and measurements on the designed directional couplers show the validity of this paper

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A Study on the Adjusting Fine Method of Tap-off for CATV Transmitting Circuits Using Coupled-Line Theory (결합선로이론을 이용한 CATV 전송회로용 Tap off의 미조정방법에 관한 연구)

  • 김동일;민경식;정세모
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.31A no.6
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    • pp.26-33
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    • 1994
  • Much time and labor has been conventionally paid for fine adjustment of circuit elements by experience to improve the characteristics of Tap-off for CATV systems. To solve the problem, in this paper, the relations between the even- and odd-mode impedance. Z$_{oe}$ and Z$_{oo}$ of symmetrical 4-port coupled-line directional coupler and power dividing characteristics of Tap-off for CATV system have been derived. After the coupling, the reflectivity and the isolation are represented by Z$_{oe}$ and Z$_{oo}$ only, the fine adjustment of all S-parameters can be performed by controling the elements of Z$_{oe}$ and Z$_{oo}$ only. Furthermore, the validity of the new fine adjustment method proposed here has been confirmed by experiments.

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Lumped Element MMIC Direction Coupler Based on Parallel Coupled-Line Theory (평행 결합선로 이론에 근거한 MMIC 집중 소자형 방향성 결합기)

  • Kang, Myung-Soo;Joung, Myung-Sup;Park, Jun-Seok;Lim, Jae-Bong;Cho, Hong-Goo;Lee, Jae-Hak;Kim, Heong-Seok
    • Proceedings of the KIEE Conference
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    • pp.2028-2030
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    • 2004
  • In this paper, a lumped equivalent circuit for a conventional parallel directional coupler is proposed. The equivalent circuit and design formula for the presented lumped element coupler is derived based on the even- and odd-mode properties of a parallel-coupled line. By using the derived design formula, we have designed the 3dB and 4.7dB lumped element directional couplers at the center frequency of 3.4GHz and 5.6GHz. A chip type directional coupler has been designed to fabricate with MMIC(Monolitic Microwave integrated circuit) process. Excellent agreements between simulations and measurements on the designed directional couplers show the validity of this paper.

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