• Title/Summary/Keyword: H-Band

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The Design of Ultra-Wide Band(UWB) Band Pass Filler with WLAN Notched Band Using Defected Ground Structure (결함 기저면 구조를 이용한 무선 랜 차단대역을 포함하는 Ultra-Wide Band(UWB) 대역통과 필터 설계)

  • Park, Chang-Hyun;Jo, Sung-Sik;Park, Jung-Ah;Kim, Kab-Ki
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2008.10a
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    • pp.299-302
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    • 2008
  • In this paper, A compact ultra-wideband(UWB) bandpass filter(BPF) with WLAN notched filter has been proposed. H-shaped slot is studied and adopted to tighten the coupling of inter-digital capacitor in order to improve the BPF's performance. Three pairs of tapered defected ground structures(DGS) are formed to assign their transmission zeros towards the out of band signal, thereby suppressing the spurious passband. Also Meander line slot is developed to reject the undesired wireless local-area network(WLAN) radio signals. That's combining these three structures we obtain a small sized UWB BPF.

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The Design of Ultra-Wide Band(UWB) Band Pass Filter with WLAN Notched Band of DGS(Defected Ground Structure)-Type (DGS형 무선 랜 차단대역을 포함하는 UWB(Ultra-Wide Band) 대역통과 여파기 설계)

  • Kim, Kab-Ki
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.11
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    • pp.1909-1913
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    • 2008
  • In this paper, A compact ultra-wideband(UWB) bandpass filter(BPF) with WLAN notched filter has been proposed. H-shared slot is studied and adopted to tighten the coupling of inter-digital capacitor in order to improve the BPF's performance. Three pairs of tapered defected ground structures(DGS) are formed to assign their transmission zeros towards the out of band signal, thereby suppressing the spurious passband. Also Meander line slot is de#eloped to reject the undesired wireless local-area network(WLAN) radio signals. That's combining these three structures we obtain a small sized UWB BPF.

Orthogonally-Polarized Dual-Band Switchable Microstrip Antenna Using PIN-Diode Loaded H-Shape Slot (PIN 다이오드가 구비된 H 모양 슬롯을 이용한 직교편파 이중대역 변환 마이크로스트립 안테나)

  • Lim, Eunsook;Pyo, Seongmin
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.2
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    • pp.156-162
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    • 2016
  • This paper proposes a novel orthogonally-polarized dual-band switchable microstrip antenna. The proposed antenna consists of a perpendicular feeding network and an radiator with a PIN-installed H-shaped slot. When the states of one single PIN diode in H-slot are controlled by bias voltages, the controlled physical geometry of the H-slot determines the operation frequencies of switchable 1.80 GHz and 2.43 GHz for vertically polarized linear polarization and fixed 2.06 GHz for horizontally linear polarization. The implemented antenna experimentally demonstrates reconfigurable dual-band capability by means of controling the states of the PIN diode. The simulation and measurement results of the implemented antenna have been in good agreement with the reflection coefficients, realized antenna gains and far-field radiation patterns at each of the PIN diode states.

Organotitanium Chemistry (IV). The Molecular and Electronic Structure of $TiCl(OC_6H_5)_3{\cdot}C_6H_5OH\;and\;Ti(OC_6H_5)_4{\cdot}C_6H_5OH$ (유기티탄 화학 (제4보). $TiCl(OC_6H_5)_3{\cdot}C_6H_5OH\;및\;Ti(OC_6H_5)_4{\cdot}C_6H_5OH$의 분자 및 전자구조)

  • Lee Hoosung;Uh Young Sun;Sohn Youn Soo
    • Journal of the Korean Chemical Society
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    • v.19 no.2
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    • pp.92-97
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    • 1975
  • The molecular and electronic structures of $TiCl(OC_6H_5)_3{\cdot}C_6H_5OH\;and\;Ti(OC_6H_5)_4{\cdot}C_6H_5OH$ have been studied by employing cryoscopic and electronic spectroscopic methods. The cryoscopic data have shown that the dimeric tetraphenoxytitanium(Ⅳ) phenolate in solid undergoes complete dissociation into monomer in solution and also the chlorocomplex starts dissociation around the concentration of 8 m mole/l. Therefore, these two Ti-complexes are pentacoordinated in dilute solution and the local symmetry of the titanium ion in these complexes seems to be trigonalbipyramid. The electronic spectra of $TiCl(OC_6H_5)_3{\cdot}C_6H_5OH$ and $Ti(OC_6H_5)_4{\cdot}C_6H_5OH$ each show two band, systems, one vibration-structural band characteristic of the aromatic ring in the near UV and another visible band at 26.8 kK, 29.6 kK, respectively, which are assigned as a ligand to metal charge transfer band corresponding to $^1A_1''{\to}^1E'\;or\;^1E''$ transition.

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Materials properties of wide band-gap semiconductors and their application to high speed electronic power devices (Wide band-gap반도체의 물성 및 고주파용 전력소자의 응용)

  • 신무환
    • Electrical & Electronic Materials
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    • v.9 no.9
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    • pp.969-977
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    • 1996
  • 본고에서는 여러가지 Wide Band-gap중에서 특히 최근에 많은 관심을 끌고 있는 GaN와 4H-SiC, 6H0SiC의 전자기적 물성을 소개하고 현재 이들로부터 제작된 prototype소자들의 성능을 비교함으로써 그 발전현황을 알아보기로 한다. 본고에서 관심을 두는 소자분야는 광전소자(optoelectronic devices)라기보다는 고주파 고출력용 전력소자임을 밝힌다. 아울러 GaN로부터 제작된 MESFET(MEtal Semiconductor Field-Effect Transistor)소자의 고주파 대역에서의 Large-Signal특성을 Device/Circuit Model을 통하여 실험치와 비교하여보고 이로부터 최적화된 channel 구조를 갖는 소자구조에서의 RF특성을 조사한다.

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V-band CPW receiver chip set using GaAs PHEMT (GaAs PHEMT를 이용한 V-band CPW receiver chip set 설계 및 제작)

  • W. Y. Uhm;T. S. Kang;D. An;Lee, B. H.;Y. S. Chae;Park, H. M.;J. K. Rhee
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2002.11a
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    • pp.69-73
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    • 2002
  • We have designed and fabricated a low-cost, V-band CPW receiver chip set using GaAs PHEMT technology for the application of millimeter-wave wireless communication systems. Low noise amplifiers and down-converters were developed for this chip set. The fabricated low noise amplifier showed an S$\sub$21/ gain of 14.9 ㏈ at 60 ㎓ and a noise figure of 4.1 ㏈ at 52 ㎓. The down-converter exhibited a high conversion gain of 2 ㏈ at the low LO Power of 0 ㏈m. This work demonstrates that the GaAs PHEMT technology is a viable low-cost solution for V-band applications.

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FUSESHARP: A MULTI-IMAGE FOCUS FUSION METHOD USING DISCRETE WAVELET TRANSFORM AND UNSHARP MASKING

  • GARGI TRIVEDI;RAJESH SANGHAVI
    • Journal of applied mathematics & informatics
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    • v.41 no.5
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    • pp.1115-1128
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    • 2023
  • In this paper, a novel hybrid method for multi-focus image fusion is proposed. The method combines the advantages of wavelet transform-based methods and focus-measure-based methods to achieve an improved fusion result. The input images are first decomposed into different frequency sub-bands using the discrete wavelet transform (DWT). The focus measure of each sub-band is then calculated using the Laplacian of Gaussian (LoG) operator, and the sub-band with the highest focus measure is selected as the focused sub-band. The focused sub-band is sharpened using an unsharp masking filter to preserve the details in the focused part of the image.Finally, the sharpened focused sub-bands from all input images are fused using the maximum intensity fusion method to preserve the important information from all focus images. The proposed method has been evaluated using standard multi focus image fusion datasets and has shown promising results compared to existing methods.

Quadruple Band-Notched Trapezoid UWB Antenna with Reduced Gains in Notch Bands

  • Jin, Yunnan;Tak, Jinpil;Choi, Jaehoon
    • Journal of electromagnetic engineering and science
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    • v.16 no.1
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    • pp.35-43
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    • 2016
  • A compact ultra-wide band antenna with a quadruple band-notched characteristic is proposed. The proposed antenna consists of a slotted trapezoid patch radiator, an inverted U-shaped band stop filter, a pair of C-shaped band stop filters, and a rectangular ground plane. To realize the quadruple notch-band characteristic, a U-shaped slot, a complementary split ring resonator, an inverted U-shaped band stop filter, and two C-shaped band stop filters are utilized in this antenna. The antenna satisfies the -10 dB reflection coefficient bandwidth requirement in the frequency band of 2.88-12.67 GHz, with a band-rejection characteristic in the WiMAX (3.43-3.85 GHz), WLAN (5.26-6.01 GHz), X-band satellite communication (7.05-7.68 GHz), and ITU 8 GHz (8.08-8.87 GHz) signal bands. In addition, the proposed antenna has a compact volume of $30mm{\times}33.5mm{\times}0.8mm$ while maintaining omnidirectional patterns in the H-plane. The experimental and simulated results of the proposed antenna are shown to be in good agreement.

Effect of Phytate on the Electrophoretic Behavior of Rapeseed Protein Isolate (분리 유채단백의 전기영동 패턴에 미치는 Phytate의 영향)

  • Cho, Hee-Kyung;Yoon, Jae-Young;Lee, Su-Rae
    • Korean Journal of Food Science and Technology
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    • v.24 no.3
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    • pp.284-288
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    • 1992
  • This study was undertaken to investigate the effect of pH and phytate level on the solubility of the protein due to binding between phytate and low-phytate rapeseed protein isolate by means of SDS-polyacrylamide gel electrophoresis. Results showed that the number of protein bands decreased by the increasing amount of phytate added to the soluble extract at pH 2.0 and 5.0 whereas there was no change at pH 11.5. Among 18 bands of rapeseed proteins at pH 2.0, seven bands (105.8, 52.3, 37.3, 34.8, 26.3, 21.3, 18.4 KDa) were removed by precipitation with 100 mg phytate addition and six bands (78.8, 46.5, 19.4, 16.8, 11.7, 8.5 KDa) further disappeared by 150 mg phytate addition. Among 15 bands at pH 5.0, only four bands disappeared by phytate addition. It is suggested that the functionality of rapeseed protein isolate can be improved by lowering the phytate content.

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Frequency and Input Impedance Selective Antenna Using Lumped Element for Multi-band Handhold Terminals (집중형 소자를 이용한 공진 주파수 및 입력 임피던스 선택형 다중 대역 튜너블 안테나)

  • Jung, Byung-Woon
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.7 no.2
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    • pp.50-55
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    • 2008
  • In this paper, multi-band internal antenna which can adjust both resonant frequency and input impedance of antenna as using lumped inductor between shoring plate and ground plane is proposed. The structure of proposed antenna consists of PIFA (Planar Inverted F Antenna) structure and half-wavelength loaded line structure and has two shorting plates and one feeding plate. One shorting plate is shared. The operating frequency bands of designed antenna are GSM, GPS in the PIFA structure and DCS, US-PCS, W-CDMA in half-wave loaded line structure as varying the inductor value in 2.2nH, 3.3nH, and 4.7nH. As varying the inductor value in the shared shorting plate, input impedance of antenna is varied. To minimize the gain variation of antenna as adding lumped element, the inductor value is restricted at maximum of 6.8nH. The maximum gain of proposed antenna is measured as -1.60dBi in the GSM band, -1.16dBi in the GPS band, and 1.41dBi in the DCS/US-PCS/W-CDMA band.

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