• Title/Summary/Keyword: Wideband antenna

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Design of Loop Antenna Using Coplanar Waveguide Feeding Method (동일면 도파관 급전방식을 이용한 루프안테나 설계)

  • Yeo, Junho;Lee, Jong-Ig
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.55-56
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    • 2017
  • In this paper, a wideband loop antenna is designed using a CPW feeding method for indoor digital TV applications. The proposed loop antenna consists of a square loop and two circular sectors which connect the loop with central feed points, and the CPW feed line is inserted in the lower circular sector. The CPW feed line is designed to match with the 75 ohm port impedance for DTV applications, and the ground slots are etched in order to improve the impedance matching in the middle frequency region. The optimized antenna is fabricated on FR4 substrate, and the experiment results show that it operates in the frequency band of 463-1,280 MHz for a VSWR < 2, which assures the operation in the DTV band.

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Analysis of a Semicircle Antenna by Tilt Angles for Wideband Applications (광대역 통신용 반원형 안테나의 경사각에 의한 성능분석)

  • Jung, Chang-Won;Yeom, In-Su;Park, Se-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.7
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    • pp.1509-1513
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    • 2009
  • A semicircle antenna is presented for wideband communication system. The proposed antenna radiates linear polarized wave omnidirectionally in wide frequency band from 1.5 GHz to more than 5 GHz (110%). The frequency bands of the proposed antenna are investigated from the variable current path lengths by tilting angles. The overall radiation gain of the proposed antenna is 2-3 dBi.

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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Characteristic Improvement & Design of Dual Polarization Wideband Single Element Antenna for IMT-2000 Base Station (IMT-2000 기지국용 이중 편파를 위한 광대역 단일 소자 안테나 설계 및 특성 개선)

  • Jang, Won-Ho;Park, Joo-Sung;Tae, Jae-Hoon;Lee, Yun-Hyun
    • Journal of Advanced Navigation Technology
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    • v.6 no.3
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    • pp.251-257
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    • 2002
  • Design and characteristic improvement of existing folded dipole antenna is presented to adopt W-CDMA(1.885~2.170 GHz) wideband antenna radiators. The antenna structure has +/- 45 degrees dual polarization. In order to overcome the narrow bandwidth and low gain characteristic typical of the microstrip antenna, double layered structure was employed. The antenna achieved below - 20 dB reflection coefficients each ports, - 20 dB of port isolation, above 7 dBi of gain, providing evidence that the proposed design can be used in the W-CDMA service frequency band antenna.

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A Trapezoidal Ultra-Wideband Antenna Design (사다리꼴 모양의 UWB 안테나 설계)

  • Lee Jung-Nam;Lee Seong-Hun;Park Jong-Kweon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.3
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    • pp.235-245
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    • 2005
  • In this paper, a novel Ultra-Wideband(UWB) antenna fed by CPW is designed, fabricated, and measured for UWB communications. We have used the Microwave Studio of CST to simulate the proposed antenna. It is designed to work on a substrate TMM4 of thickness 0.762 mm and relative permittivity 4.5. The proposed antenna is satisfied with Ultra-Wideband communication band from 3.1 GHz to 11.5 GHz, for VSWR$\leq$2, and isolated IEEE 802.1la frequency band(5.15 GHz$\~$5.825 GHz) using a rectangular slot. Measured group delay variation is less than 1 ns, thus indicating the proposed antenna a good candidate for UWB applications.

CPW-Fed π-Shaped Antenna for Wideband (CPW급전 광대역 파이형 안테나)

  • Kang, Young-Man;Ceong, Hyi-Thaek;Rhee, Seung-Yeop
    • The Journal of the Korea institute of electronic communication sciences
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    • v.13 no.2
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    • pp.291-298
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    • 2018
  • In this paper, we propose an antenna that improves narrow band characteristics which is a disadvantage of inverted-F type antenna and utilizes the structural advantages of small size and low profile by modifying the inverted-F type antenna structure and applying CPW feeding method. Experimental results show that the broadband characteristic of about 40% at the center frequency of 3 GHz is seen, and it is found that the narrow band characteristic which is a disadvantage of the conventional inverted F antenna can be improved. The radiation pattern showed almost omnidirectional characteristics and the maximum gain was about 2.0dBi.

A study on the Heart-shape Beam Pattern Antenna for IMT-Advanced (4세대 이동통신용 하트형 빔 패턴 안테나의 설계에 관한 연구)

  • Yoon, Hyun-Soo;Kong, Jin-Woo;Choi, Byoung-Ha
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.857-862
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    • 2007
  • In this paper, we studied about the antenna designed by heart-shape beam pattern for 4G mobile communication applications. The proposed whole size of structure was identical if it compare with the basis structure. But size of the patch was improved a little(upaward 1.3). The impedance bandwidth was improved about 258% which compares with the basis structure. And the structure could get very good characteristic applicatory to IMT-Advanced. Impedance bandwidth of antenna was about 22%(870MHz). The gain of above 8.7dBi was achieved extended IMT-Advanced all frequency band.

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Wideband Slot Antenna with Corrugated Structure (물결모양 구조를 갖는 광대역 슬롯 안테나)

  • Kim, Taewon;Yoon, Sungjoon;Lee, Heejae;Choi, Jae-Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.1
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    • pp.14-19
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    • 2016
  • In this paper, a wideband slot antenna with corrugated structure antenna is proposed. The proposed antenna consists of a ground plane with corrugated slot and microstrip feed-line. Even with a limited dimension of $70{\times}70{\times}1.6mm$, the proposed antenna has wide bandwidth due to the longer current path formed by the corrugated slot structure. Measured bandwidth(10 dB return loss) and fractional bandwidth of the proposed antenna are 2,180 MHz(2.5~4.68 GHz) and 60.7 % at the center frequency of 3.59 GHz. The proposed antenna has an omni-directional radiation pattern and measured gains and average efficiency were 3.48~5.83 and dBi, 81.55 %, respectively.

Design of Wide Band Antennas for Mobile Communications (이동통신용 광대역 패치 안테나 설계)

  • Kim, Jang-Wook
    • Journal of the Korea Society of Computer and Information
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    • v.18 no.3
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    • pp.27-34
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    • 2013
  • A wideband patch antenna fed by an L-strip feeder is studied. The objective of this paper is to design small wideband antenna for 3G and 4G wireless mobile communication service. The enhanced features were confirmed and proved by comparing the proposed antenna with the antennae that have been reported in the relevant literatures. Measurement results confirm that an impedance bandwidth($VSWR{\leq}2$) of 636MHz(32.5%, fo=1,960MHz) is achieved at 3G and 4G frequency band for L-strip-fed triangular patch antenna. In general, probe feed has only the parasitic reactance caused by the probe, which reduces the bandwidth performance of the antenna. The experimental results proved that the effects of improvement could be achieved because the proposed antenna is capable of compensating the parasitic reactance from the feeding mechanism. The studied antenna can be designed easily for extension of array because it has simple structure.

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

  • Ko Chea-Ok;Park Min-Young;Kim Jeong-Lan;Lee Ae-Kyoung;Choi Hyung-Do;Choi Jae-Ic;Pack Jeong-Ki
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.4
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    • pp.341-350
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    • 2006
  • In this paper, a new method for detecting breast cancer is proposed, which utilizes dielectric characteristics of pathological tissues and time delay of back scattered response, and its feasibility was investigated. 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 and a good calibration signal are key elements of such detection system. Further study is ongoing to develop a commercial system.