• Title/Summary/Keyword: Wideband antenna

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A Simple Planar Heptaband Antenna with a Coupling Feed for 4G Mobile Applications

  • Hong, Youngtaek;Tak, Jinpil;Choi, Jaehoon
    • Journal of electromagnetic engineering and science
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    • v.15 no.4
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    • pp.239-244
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    • 2015
  • A simple planar heptaband antenna with a coupling feed for 4G mobile applications is proposed. This antenna consists of a folded monopole and a feed strip line on the top plane and an L-shaped line with a coupling plate on the bottom plane. The antenna provides a wide bandwidth to cover the LTE/GSM/UMTS heptaband operation. The measured 6-dB return loss bandwidth is 152 MHz (820-972 MHz) in the lowfrequency band and 1,150 MHz (1,600-2,750 MHz) in the high-frequency band. The overall dimensions of the proposed antenna are $60mm{\times}105mm{\times}1.2mm$.

Band-Notched Ultra-Wideband Antenna with Asymmetric Coupled-Line for WLAN and X-Band Military Satellite

  • Lee, Jun-Hyuk;Sung, Young-Je
    • Journal of electromagnetic engineering and science
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    • v.13 no.1
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    • pp.34-37
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    • 2013
  • This paper presents a novel ultra-wideband (UWB) antenna that rejects narrow and broad bands and is suitable for wireless communications. The base of the proposed antenna has a circular patch that can cover the UWB frequency range (3.1~10.6 GHz). The interference issues caused by co-existence within the UWB operation frequency are overcome by a design that uses a parallel-coupled asymmetric dual-line with a circular monopole antenna. The proposed antenna showed a stable radiation pattern, realized gain and reflection coefficient lower than -10 dB across the UWB operation bandwidth except for 5.15~5.85 GHz and 7.25~8.4 GHz. The fabrication, simulation, and measurement results obtained for the proposed antenna were in good agreement with the expected values.

Study on the Bandwidth of Microstrip Patch Antenna (슬롯 패치 안테나의 대역폭 확장에 관한 연구)

  • Lee, Chick-Youl
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.6
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    • pp.581-585
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    • 2013
  • A technique to expand the operating impedance bandwidth of a microstrip patch antenna is presented. The antenna is fed by a truncated T-shaped microstrip line on the ground plane with the rectangular slot. The proposed microstrip patch antenna offers wide bandwidth characteristics with the rectangular slot which has optimized size and position on the ground plane. The simulation result shows a fractional bandwidth of 127.8 %(0.65 to 2.95 GHz) at VSWR 2:1.

Design of a Wideband Antipodal Vivaldi Antenna with an Asymmetric Parasitic Patch

  • Bang, Jihoon;Lee, Juneseok;Choi, Jaehoon
    • Journal of electromagnetic engineering and science
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    • v.18 no.1
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    • pp.29-34
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    • 2018
  • An antipodal Vivaldi antenna with a compact parasitic patch to overcome radiation performance degradations in the high-frequency band is proposed. For this purpose, a double asymmetric trapezoidal parasitic patch is designed and added to the aperture of an antipodal Vivaldi antenna. The patch is designed to efficiently focus the beam toward the end-fire direction at high frequencies by utilizing field coupling between the main radiating patch and the inserted parasitic patch. As a result, this technique considerably improves the gain and stability of radiation patterns at high frequencies. The proposed antenna has a peak gain greater than 9 dBi over the frequency range of 6-26.5 GHz.

Design of an Ultra-Wideband Antenna Using a Ring Resonator with a Notch Function

  • Lee, Jung-Nam;Kwon, Heon-Kook;Kang, Byung-Su;Lee, Kwang-Chun
    • ETRI Journal
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    • v.35 no.6
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    • pp.1075-1083
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    • 2013
  • This paper describes an ultra-wideband (UWB) antenna that uses a ring resonator concept. The proposed antenna can operate in the entire UWB, and the IEEE 802.11a frequency band can be rejected by inserting a notch stub into the ring resonator. The experiment results indicate that the measured impedance bandwidth of the proposed antenna is 17.5 GHz (2.5 GHz to at least 20 GHz). The proposed UWB antenna has omnidirectional radiation patterns with a gain variation of 3 dBi (1 dBi to 4 dBi).

Design of Simplified Wideband Sleeve Monopole Antenna (광대역 슬리브 모노폴 안테나의 단순화 설계)

  • Hwang, Hee-yong;Choi, Kyoung
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.1100-1103
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    • 2019
  • This paper presents the design method of a planar sleeve monopole antenna on PCB, which has wider bandwidth compared to that of the conventional sleeve monopole antenna, by showing the fact that the sleeve of the conventional antenna can be simplified in structure. The designed and fabricated planar sleeve monopole antenna's structure is very simple, with a monopole adjacent to a small square sleeve on FR4 PCB. The antenna shows 46% wider bandwidth compared to the corresponding 3-dimensional one with nearly omni-directional radiation property.

Application of Principle Component Analysis and Measurement of Ultra wideband PD signal for Identification of PD sources in Air (기중부분방전원 식별을 위한 광대역 부분방전신호의 측정 및 주성분분석기법의 적용)

  • Lee, K.W.;Kim, M.Y.;Park, D.W.;Shim, J.B.;Chang, S.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.505-506
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    • 2006
  • PD(partial discharge) occurred from variable PD sources in air may be the cause of breakdown in high voltage equipment which affect huge outage in power system. Identification and localization of PD sources is very important for engineer to cope with huge accident beforhand. PD phenomena can be detected by acoustic emission sensor or electromagnetic sensor like antenna. This paper has investigated the identification method using PCA(principal component analysis) for the PD signals from variable PD sources, for which the electric field distribution and PD inception voltages were simulated by using commercial FEM program. PD signals was detected by ultra wideband antenna. Their own features were extracted as the frequency coefficients transformed with FFT(fast fourier transform) and used to obtain independent pincipal components of each PD signals.

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Feasibility Study for the Development of a Device for Detecting Pathological Tissues (병리학적 조직 진단장치 개발에 대한 타당성 분석 연구)

  • Ko, Chea-Ok;Park, Min-Young;Pack, Jeong-Ki
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.421-424
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    • 2005
  • X-ray is currently most effective method in detecting small malignant breast tumors but has the several problems due to suppressing breast, ionizing radiation and not detecting small cancer. In this paper, a new method is proposed by using dielectric characteristics of pathological tissues and time delay of backscattered response. We have developed a detection algorithm and verified it by numerical simulation and measurement for a prototype system. For a prototype system, we have fabricated experimental model(artificial breast with a cancer) and UWB(ultra-wideband) antenna. The results of the measurement simulation show an excellent detection capability of a cancer tissue. It is found that a good UWB antenna is a key element of such detection system. Further study is ongoing to develop a commercial system.

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Compact wideband printed antenna with band-rejection characteristic (대역 저지 특성을 갖는 소형 광대역 안테나)

  • Choi, Woo-Young;Seol, Kyung-Moon;Jung, Ji-Hak;Chung, Kyung-Ho;Choi, Jae-Hoon
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.259-264
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    • 2005
  • In this paper, a novel compact microstrip-fed antenna with band-rejection characteristic for wideband applications is proposed. By cutting an L-shaped notch on the radiation patch, the wideband property for the proposed antenna is achieved. In addition, a C-shaped slot is introduced to obtain the band rejection operation of the antenna. The antenna, with very small size of $15.5\times21 mm^2$ including the ground plane, operates over 3.08 to 10.97 GHz and has the rejection band of 5.03 to 5.91 GHz for $S_{11}$ < -10 dB.

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CPW Feed Wideband U-slot Microstrip Antenna

  • Lee, Jong-In;Lee, Byoung-Moo;Yoon, Young-Joong
    • Journal of electromagnetic engineering and science
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    • v.2 no.1
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    • pp.11-15
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    • 2002
  • In this paper, we have proposed the new configuration of wideband antenna using CPW fred lines. The proposed antenna has CPW feed lines and U-slot to achieve wade bandwidth with good impedance matching. The use of CPW feed line can decrease the number of substrates. It is compared with the conventional antenna find by a microstrip fled line. The parameters of CPW fred lines were studied by using the quasi-static approximation which is based on the conformal mapping method. The analysis of CPW discontinuities such as the tapered-step structure and the open ended gap were studied by using the quasi-static approximation which is based on the boundary element method. Also, the equivalent circuit model of multi-layer antenna were proposed using the cavity model. Experiment results of the proposed antenna 7how wide-bandwidth characteristics and good radiation patterns in passband.