• Title, Summary, Keyword: CPW-급전

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Design of a CPW-fed Double-Dipole Quasi-Yagi Antenna (CPW 급전 이중 다이폴 준-야기 안테나 설계)

  • Yeo, Junho;Lee, Jong-Ig
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.22 no.11
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    • pp.1518-1523
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    • 2018
  • A method for designing a DDQYA fed by a CPW is proposed in this paper. The proposed CPW-fed DDQYA consists of two series-connected strip dipoles, a ground reflector, and a strip-pair director. Instead of the conventional microstrip feed line in which the signal line is located on the substrate opposite to the antenna, a CPW is used because CPW is located on the same side with the antenna, and so the fabrication is easy. The strip-pair director is composed of two horizontally-separated strips, and it is added above the second dipole to enhance the gain in the high frequency region. A prototype of the proposed CPW-fed DDQYA is fabricated on an FR4 substrate. The fabricated antenna has a frequency band of 1.66-3.38 GHz(68.3%) for a voltage standing wave ratio < 2, and measured gain ranges 5.0-7.3 dBi over a frequency band of 1.60-2.90 GHz.

CPW Fed Ultra Wide Band Slot Antenna (초광대역 CPW 급전 슬롯안테나)

  • 김기수;박동국
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.7
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    • pp.663-668
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    • 2003
  • In this paper, a CPW fed slot antenna with novel broadband feed structure is presented. To enhance the impedance bandwidth of the slot antenna we proposed the broadband feed structure of new bow-tie slot which is combined with four λ/2 rectangular radiation slot and inductively coupled. The measured 10 dB impedance bandwidth is about 60 %(5.2∼9.4 GHz) and the simulated antenna gain is about 6 dBi at 7.36 GHz.

CPW-fed Wideband Loop Antenna for Indoor Digital TV Applications (실내 디지털 TV용 CPW-급전 광대역 루프 안테나)

  • Yeo, Junho;Lee, Jong-Ig
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.8
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    • pp.1492-1497
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    • 2017
  • In this paper, a design method for a CPW-fed wideband loop antenna for indoor digital TV applications is studied. 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 effects of the gap between the circular sectors and the location and dimension of the ground slots on the input reflection coefficient and gain characteristics are examined to obtain the optimal design parameters. 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.

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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Design of Wide-Band Slot Antenna with CPW-Fed (CPW 급전 광대역 슬롯 안테나 설계)

  • 김명석;신경섭;김영두;이홍민
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.2
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    • pp.212-216
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    • 2004
  • In this paper, a new design for a Coplanar Waveguide(CPW) fed wide-band slot antenna is presented. To enhance the impedance bandwidth of the slot antenna, we proposed the tapering slot structure. A various resonance modes are generated in the tapering slot. The measured impedance bandwidth of the proposed antenna is about 13:1(2.0 GHz∼25.9 GHz) with VSWR$\leq$2. Simulation and measurement results for return loss and radiation pattern are presented.

Design and fabrication of the Printed Type Folded Slot Antenna (인쇄회로형 폴디드 슬롯 안테나 설계.제작)

  • 송면규;한중호;이종녕;양규식
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.3 no.2
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    • pp.267-272
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    • 1999
  • In general, printed antennas have a narrow bandwidth characteristic and many people want to find out the method of bandwidth improvement through complicated procedures. So we want to reform the conventional printed antenna characteristic by using the folded dipole's superiority to unit dipole. But it is hard to feed the printed folded dipole antenna, we use the CPW, which is widely used in microwave IC or MMIC applications and have many advantages to the conventional microstrip line, to feed the printed folded slot antenna. It is confirmed that the improvement in the bandwidth characteristic of CPW fed folded slot antenna, as much as 20%, through the measurement of designed and implemented antenna.

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Designs on CPW-FED Aperture Antenna for UWB Applications for Wireless System in a Ship (선박 내 무선 시스템을 위한 UWB용 CPW-FED APERTURE 안테나 설계)

  • Kim, Kab-Ki
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.14 no.4
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    • pp.347-351
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    • 2008
  • In this paper, a new co-planar waveguide ultra-wideband aperture is designed as wireless application in ships. The designed antenna consists of a rectangular aperture on a determined ground plane and a mushroom shaped stub. The mushroom-shaped stub, which is simple, convenient to analyze and optimise, has less parameters. This antenna has compact aperture size $21.1{\times}8.1mm^2$, designed on FR-4 substrate with dielectric constant of 4.3, thickness of 1.5mm. CPW fed planar antenna has the advantages of wide-bandwidth, low-cost and easy interaction with the radio frequency front end circuitry.

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CPW-fed Broadband Monopole Antenna for HDTV Reception (CPW로 급전되는 HDTV용 광대역 모노폴 안테나)

  • Lee, Jong-Ig;Han, Dae-Hee;Kim, Soo-Min;Kim, Gun-Kyun;Yeo, Junho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.564-566
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    • 2012
  • In this paper, a design method for a compact broadband planar monopole antenna fed by coplanar waveguide (CPW) is studied. The proposed broadband monopole is optimized for terrestrial digital television (DTV) receiving. The monopole is fed by a CPW with 75-ohm characteristic impedance on an FR4 substrate and its size is $100mm{\times}200mm$. A pair of slit is appended for size reduction and an inductive stub is loaded for the impedance matching between the feedline and monopole. The optimized monopole antenna for DTV band (470-806 MHz) is fabricated on an FR4 substrate and tested experimentally to verify the results of this study.

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Design of the CPW-Fed Triple-band Internal Planar Monopole Antenna (CPW 급전 삼중대역 내장형 평면 모노폴 안테나 설계)

  • Lim, Jung-Sup;Kim, Cheol-Bok;Jang, Jae-Sam;Lee, Ho-Sang;Jung, Young-Ho;Cho, Dong-Ki;Lee, Mun-Soo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.12
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    • pp.73-78
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    • 2007
  • In this paper, the CPW-fed triple-band internal planar monopole antenna which simultaneously meets the three bands such as Cellular, PCS and Wibro is designed. The size of the radiation elements can be reduced to about $\lambda/4$ by designing the CPW-fed monopole antenna and then we can miniaturize the antenna size by meandering the radiation elements. In addition, we design the planar antenna for the slim-type mobile phone. We can obtain the desired antenna properties by controlling the length of each radiation elements. The measured return loss of the antenna is less than -7 dB at the desired bandwidth. And the measured radiation patterns are similar to that of the monopole antenna. The designed antenna has the gains -5.2 dBi. -2 dBi, -0.4 dBi at each resonant frequencies respectively.

A Study on Multi-Frequency Antenna with CPW Feeder (CPW급전을 이용한 다중 공진 안테나 연구)

  • 이정남
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.3
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    • pp.535-540
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    • 2004
  • In this paper, We proposed a rectangular slot antenna with CPW feeder. Slot antennas fed by CPW are attractive due to the simple fabrication simplicity and ease of integration with active devices. This antenna consists of two parts, inner patch and outer patch to realize wide-band antenna by multi-frequency. Also, We fabricated a proposed rectangular slot antenna, confirm characteristics of multi-frequency by tuning antenna parameters, inner antenna's location and size. The experimental results show that each resonant frequency of a fabricated antenna is measured at almost 1, 9GHz, 2.8GHz, 3, 5GHz, 4, 9GHz. In radiation patterns each resonant frequency, radiation pattern 4-th resonant frequency is the same ad that of TM11 in patch antenna. Therefore, the experimental and theoretical results shows that a proposal rectangular slot antenna have triple resonant frequencies.