• Title/Summary/Keyword: Return loss

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A Design of a Meander Antenna using Magneto-dielectric Material for 433.92 MHz band (433-92 MHz대 Magneto-dielectric 매질을 이용한 미앤더 안테나의 설계)

  • Tran, Viet Hong;Park, Chul-Keun;Min, Kyeong-Sik
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2005.11a
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    • pp.323-328
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    • 2005
  • The paper describes a meander antenna using magneto-dielectric composite for 433.92 MHz band. The antenna with magneto-dielectric material in this paper is suggested for miniaturization of antenna size. The return loss of meander antenna is achieved by optimizing the permittivity, $\varepsilon_r$=1.71-j0.004 and permeability, $\mu_r$=2.39+j2.58. Over all dimension of the antenna is $51\times11\times1.6mm$. The return loss and gain are -41 dB, -5dBi, respectively at 433.92 MHz.

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Design and Implementation of the GHz-Band Wide (2~18 GHz) Linear Equalizer

  • Kahng, Sung-Tek;Ju, Jeong-Ho;Moon, Won-Gyu
    • Journal of electromagnetic engineering and science
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    • v.7 no.1
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    • pp.42-46
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    • 2007
  • This paper presents a linear amplitude equalizer developed to secure the linearity of the slope of the amplitude over the frequency band ranging $2\sim18\;GHz$. The circuit model is featured by the resistor placed between each pair of a transmission-line and a stub. The design includes finding the values of resistors and stubs to have the optimal linear slope and return loss performances. The measured data show the acceptable performances of the slope variation and return loss over $2\sim18\;GHz$.

A Design for a Modified Circular Slot Antenna with a Fork-like Tuning Stub for UWB Operations

  • Yoon, Joong-Han
    • Journal of information and communication convergence engineering
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    • v.14 no.2
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    • pp.65-70
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    • 2016
  • This paper proposes and experimentally tests a modified circular slot antenna fed by a fork-like tuning stub for ultra-wideband (UWB) operation. The proposed antenna consists of a modified circular slot model and fork-like tuning stub. The proposed antenna is printed on a 34.0 mm × 30.0 mm FR4 substrate with thickness of 1.0 mm and relative permittivity of 4.4. The effect of various parameters of the circular slot and fork-like tuning stub is investigated for UWB operation. The modified circular slot and fork-like tuning stub are fabricated on the substrate to achieve wideband operation and good impedance matching. Experimental results demonstrated that the measured return loss exhibits an acceptable agreement with the simulated return loss and satisfies the -10 dB impedance bandwidth requirement while simultaneously covering the UWB bands. In addition, the proposed antenna shows good radiation characteristics and gains in the UWB bands.

도파관-마이크로스트립간의 트랜지션 설계

  • 이문수
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.15 no.9
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    • pp.722-728
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    • 1990
  • A comppact waveguide to microstrip transition to be used for measurements of the performances of the U-band MMIC power amplifier is designed and fabricated. A Tchebyscheff ${\lambda}$/4 impedence transformer is adopted as an impedence converter of the transition. The designed transition is optimized to get Su less then -28dB over the 40-to-48GHZ band using Supper Compact program. The measured results shows that insertion loss and return loss are typically 0.3 and 25dB respectively over 40-to-47GHz.

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Design of Implantable CPW Fed Monopole Antenna for ISM Band Applications

  • Kumar, S. Ashok;Shanmuganantham, T.
    • Transactions on Electrical and Electronic Materials
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    • v.15 no.2
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    • pp.55-59
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    • 2014
  • An implantable CPW fed monopole antenna embedded into human tissue is proposed for ISM band biomedical applications. The proposed antenna is made compatible for implantation by embedding it in an alumina ceramic substrate (${\Box}_r=9.8$ and thickness=0.65 mm). The proposed antenna covers the ISM band of 2.45 GHz. The radiation parameters, such as return loss, E-Plane, H-Plane, are measured and analyzed, using the method of moments. The proposed antenna has substantial merits over other implanted antennas, like low profile, miniaturization, lower return loss, and better impedance matching and high gain.

A study on the definition of Agricultural water use and the calculation methods (농업용수 이용량 산정 합리화 방안 연구)

  • Park, Kap-Soon;Lee, Seong-Hee;Kim, Tae-Cheol
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2002.10a
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    • pp.41-44
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    • 2002
  • It is unreasonable to calculate the amount of agricultural water use by applying unit demand method, because it is different from other water use due to the return flow and reuse in the recycle of watershed. Data from irrigation pumping station and reservoir were analysed. Factors for water balance are precipitation, evapotranspiration, percolation, runoff, and management loss, etc. Here in the study, the amount of agricultural water was defined in the way of three different categories. First one is "Gross water" including evapotranspiration, percolation, and management loss. Second one is "Agricultural water" including Gross water and effective rainfall. Third one is "Broad water" which is abstracting the return flow from Agricultural water.

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Design and Implementation of Koch curve Microstrip Patch Antenna for Antenna Miniaturization (안테나 소형화를 위한 koch curve 마이크로스트립 패치 안테나 설계 및 구현)

  • Kim, Sun-Woong;Lim, Dong-Seob;Kim, Young-Gon;Choi, Dong-You
    • Journal of Information Technology Services
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    • v.12 no.3
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    • pp.323-330
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    • 2013
  • In this paper, miniaturized patch antenna operating at ISM band has been designed by applying the fractal technique. Various type of antenna structure, microstrip patch antenna and koch curve microstrip patch antenna has been proposed and simulated using Ansoft HFSS (High Frequency Structure Simulator). The area of microstrip patch antenna and koch microstrip patch antenna is 1,058 $mm^2$, and 891 $mm^2$ respectively, showing the size reduction ratio of 16%. The finally made koch curve microstrip patch antenna resonates at 2.45GHz with return loss of 22.69dB, VSWR of 1.2142, and antenna radiation gain of 3.26dBi.

A New Technique to Improve ZnO-based FBAR Device Performances

  • Mai, Linh;Lee, Jae-Young;Pham, Van Su;Yoon, Gi-Wan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2007.06a
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    • pp.437-440
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    • 2007
  • This paper presents the improvement of the resonance characteristics of film bulk acoustic-wave resonator (FBAR) devices fabricated on multilayer Bragg reflectors (BRs) based on inserting ultra-thin chromium (Cr) adhesion layers into BRs and post-annealing processes. The measurements show excellent improvement of return loss $(S_{11})$ and Q-factor by the combined use of Cr adhesion layers and thermal treatments particularly for 120 minutes at $200^{\circ}C$.

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Design and Performances of Implantable CPW Fed Apollian Shaped Antenna at 2.45 GHz ISM Band for Biomedical Applications

  • Kumar, S. Ashok;Sankar, J. Navin;Dileepan, D.;Shanmuganantham, T.
    • Transactions on Electrical and Electronic Materials
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    • v.16 no.5
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    • pp.250-253
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    • 2015
  • A novel implantable CPW fed Apollian shaped antenna embedded into human tissue is proposed for ISM band biomedical applications. The proposed antenna is made compatible for implantation by embedding it in an alumina ceramic substrate(εr=9.8 and thickness= 0.65 mm). The proposed antenna covers the ISM band of 2.45 GHz. The radiation parameters such as return loss, xy-plane, xz-plane, and yz-plane etc., are measured and analyzed using the agilent vector network analyzer. The proposed antenna has substantial advantages, including low profile, miniaturization ability, lower return loss, better impedance matching, and high gain over conventional implanted antennas.

Aperture-Miniaturized Antenna Loaded with Split Ring Resonator Array

  • Oh, Soon-Soo;Park, Wook-Ki;Kang, Suk-Youb;Park, Hyo-Dal
    • ETRI Journal
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    • v.31 no.3
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    • pp.315-317
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    • 2009
  • In this letter, a novel antenna with a miniaturized aperture is proposed. The substrate including a split-ring resonator array is inserted into a size-reduced open-ended waveguide. For a low return loss and high radiation efficiency, the ring arrangement is optimized, and a stepped transition using H-plane discontinuity is proposed. The proposed antenna achieves a 70% aperture reduction compared to a conventional standard waveguide antenna of WR-187 (47.6 mm${\times}$22.2 mm). The return loss drops significantly at three frequencies, and a reasonable gain is achieved. The aperture-miniaturized antenna can be used in many antenna applications such as near-field measurement.

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