• Title, Summary, Keyword: CPW-fed

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A design and manufacture of CPW-Fed UWB antenna with notched WLAN band by using a U shaped slot (U자형 슬롯을 사용하여 WLAN 대역이 제거된 CPW 급전 방식을 갖는 UWB 안테나 설계 및 제작)

  • Ha, Yun-Sang;Kim, Gi-Rae;Yun, Joong-Han
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.11
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    • pp.2518-2525
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    • 2015
  • In this paper, we propose a UWB(Ultra Wide Band) antenna with CPW(Coplanar Waveguide) structure notched the 802.11a(5.15 ~ 5.825 GHz) band by using the U shaped slot. The proposed antenna not only shows Ultra-Wideband characteristic(3.1 ~ 10.6 GHz) suitable for UWB communications but has partially notched-band characteristic to reject 5 GHz WLAN band(5.15 ~ 5.825 GHz). The antenna is designed on an FR-4 substrate of which the dielectric constant is 4.4, and its overall size is $30mm(W){\times}20mm(L){\times}1mm(t)$. Fabricated antenna satisfied $VSWR{\leq}2$ in 3.1 ~ 10.6 GHz except for the band rejection of 5.15 ~ 5.825 GHz. And measured results of gain and radiation patterns characteristics displayed determined for operating bands.

A Compact CPW-fed Antenna with Step Structure for 5 GHz Band WLAN Applications (계단구조를 갖는 5 GHz 대역 무선랜용 소형 CPW 안테나)

  • Choi, In-Tae;Shin, Ho-Sub
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.1
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    • pp.8-14
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    • 2016
  • In this paper, a compact CPW-fed antenna for 5 GHz (5.15-5.35 GHz, 5.725-5.825 GHz) band WLAN applications is presented. The designed antenna's shape is step structure. The antenna is fabricated and measured into FR-4 substrate of dielectric comstant 4.2 and thickness 1.0 mm with optimized parameters obtained by simulation. We confirm that it is operated as antenna for WLAN applications by obtaining the measured return loss level of < -10 dB in 5.133-5.982 GHz. The dimensions of the antenna ($20.0{\times}16.0{\times}1.0mm^3$) shows an compactness of about 67.17% with respect to a conventional folded slot antenna.

Compact Broadband Monopole Antenna for Digital TV Reception (디지털 TV 수신용 소형 광대역 모노폴 안테나)

  • Lee, Jong-Ig;Yeo, Junho;Park, Jin-Taek
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.9
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    • pp.1996-2002
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    • 2013
  • In this paper, a design method for a compact broadband planar monopole antenna fed by a coplanar waveguide (CPW) is studied. The proposed broadband monopole is optimized for terrestrial digital television (DTV) reception. In order to achieve broadband characteristics, the monopole and ground conductor are gradually tapered. By loading slit pairs on both monopole and ground plane, the proposed antenna is miniaturized. The monopole is fed by a CPW with 75-ohm characteristic impedance on an FR4 substrate and its size is $100mm{\times}200mm$. 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.

Compact Dual-band CPW-fed Slot Antenna Using Split-Ring Resonator (분할 링 공진기를 이용한 소형 이중 대역 CPW-급전 슬롯 안테나)

  • Yeo, Junho;Park, Jin-Taek;Lee, Jong-Ig
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.11
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    • pp.2526-2533
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    • 2015
  • In this paper, a design method for a compact dual-band coplanar waveguide-fed slot antenna using SRR(split-ring resonator) conductor is studied. The SRR conductor is loaded inside a rectangular slot of the proposed antenna for dual-band operation. When the SRR conductor is inserted into the slot, the original rectangular slot is divided into a rectangular loop region and a rectangular slot region, and frequency bands are created by the loop and slot, separately. A prototype of the proposed dual-band slot antenna operating at 2.45 GHz WLAN band and 3.40-5.35 GHz band is fabricated on an FR4 substrate with a dimension of 30 mm by 30 mm. Experiment results show that the antenna has a desired impedance characteristic with a frequency band of 2.38-2.51 GHz and 3.32-5.38 GHz for a voltage standing wave < 2, and measured gain is 1.7 dBi at 2.45 GHz, and it ranges 2.4-3.2 dBi in the second band.

Design of a compact coplanar waveguide-fed 2-element quasi-Yagi antenna (코플래너 도파관으로 급전되는 소형 2-소자 준-야기 안테나 설계)

  • Baek, Woon-Seok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.12
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    • pp.2199-2205
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    • 2016
  • In this paper, a design method for a coplanar waveguide (CPW)-fed 2-element quasi-Yagi antenna (QYA) is studied. A balun between CPW and coplanar strip (CPS) which feeds a planar dipole is implemented by connecting the one end of ground strips in a CPW to a signal strip. The antenna size is reduced by bent strip dipole and reflector, and an integrated balun. The proposed antenna was designed for the operation in a UHF radio frequency identification (RFID) band of 902-928 MHz, and the effects of various parameters such as dipole length, reflector length, distance between dipole and reflector, feed position were examined. The antenna with a size of $90mm{\times}80mm$ was fabricated on an FR4 substrate, and the experiment results reveal a frequency band of 885-942 MHz for a voltage standing wave ratio < 2, a gain > 4.3 dBi, and a front-to-back ratio > 7 dB over the frequency band for the UHF RFID.

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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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.

Improvement of the Radiation Efficiency for a CPW(Co-Planar Waveguide)-Fed ZOR(Zeroth-Order Resonant) Antenna (Co-Planar Waveguide(CPW) 급전 영차 공진 안테나의 방사효율 개선)

  • Cho, Tae-Joon;Lee, Hong-Min
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.1
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    • pp.59-66
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    • 2011
  • In this paper, a co-planar waveguide(CPW)-fed zeroth-order resonant(ZOR) antenna with an improved radiation efficiency was built and tested. The unit cell of the proposed antenna consists of a series metal-insulator-metal(MIM) capacitor and a shorted shunt stub inductor. In order to reduce the antenna size and to achieve the high radiation efficiency two shorted shunt stub arms bent by 90 degree were connected to the ground plane through the via. The proposed antenna consisting of two unit cells has an open ended composite right/left-handed(CRLH) transmission line structure. As a result the dominantly radiating parts of the antenna comes from shunt stub arms and vertical vias. The total size of the fabricated zeroth-order resonant antenna is $0.22\;{\lambda}_0{\times}0.22\;{\lambda}_0$. The measured gain and efficiency of the fabricated antenna have been enhanced by 3.07 dBi and 75 %, respectively, at the zeroth-order resonant frequency of 2.97 GHz.

Disk Sector Antenna fed by CPW for UWB Communications (UWB 통신용 CPW 급전 디스크 섹터 안테나)

  • Lim, Jung-Hyun;Lee, Min-Soo;Yang, Doo-Yeong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.2
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    • pp.303-312
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    • 2009
  • In this paper, we design and fabricate a disk sector antenna fed by CPW fur UWB communications. Also, we insert a rectangular slit on the arc-edge of the disk sector antenna. Then, the antenna has the directivity of E-면. In order to design the antenna, the input impedance is matched with the feed line of $50{\Omega}$ as varying the physical antenna parameters, which are the radius, the flare angle of disk sector, the length of ground, and the length of ground comer near by feed tine. Dimension of the antenna designed for UWB communication is $72mm{\times}26mm$ and bandwidth through computer simulation is $3{\sim}13GHz$. From the measured results, the bandwidth is $1.98{\sim}11GHz$. Return loss and gain of the fabricated antenna are -50.38dB, 1.34dBi at 3.5GHz, -12.27dB, 3.35dBi at 5.5GHz, -23.2dB, 3.8dBi at 8GHz and -16.17dB, 5.2dBi at 10GHz, respectively.

A CPW-Fed Self-Affine Cross Shape Fractal Antenna (자기 아파인 프랙탈 구조를 이용한 CPW 급전 크로스 안테나)

  • Kim Tae-Hwan;Lee Jae-Wook;Cho Choon-Sik;Lee Yun-Hyun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.9
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    • pp.949-956
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    • 2005
  • In this paper, a new CPW-fed cross shape fractal antenna having a self-affinity is presented. This novel configuration, which has anisotropic scaling symmetry, makes smaller profile characteristic compared to the fractal antenna using a self-similarity. Increase of the iteration coefficient, which leads to decrease of the fundamental resonant frequency, shows a good impedance matching condition and multi-band characteristics due to new surface current paths. The radiation patterns are similar to those of monopole antennas. In the K3 stage of iteration, the proposed antenna shows a measured maximum gain 2.27 dBi at 940 MHz. A commercially available software based on the FDTD algorithm has been used to obtain the predicted results. In addition, an RT/Duroid 5880 substrate has been employed for the experimental results.