• Title, Summary, Keyword: CPW-fed

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A Design of Inverted-Triangle UWB Monopole Antenna with Band Rejection Slot (대역 저지 슬롯이 추가된 역삼각형 모노폴 UWB 안테나의 설계)

  • Choi, Hyung-Seok;Choi, Kyoung;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.5
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    • pp.516-521
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    • 2011
  • In this paper, an inverted-triangle patch UWB antenna with an uneven ground planes and an inverted T-slot for 5 GHz WLAN band rejection is presented. The operating bandwidth of the proposed antenna fed with the CPW line is expanded from 3.1 GHz to 10.6 GHz for about -10 dB return loss using three angular parameters correlated to the main patch and the ground plane. The fabricated antenna on Taconic RF-60A substrate with 6.16 relative dielectric constant and 0.64 mm thickness has a main antenna patch size of 36 mm${\times}$19.5 mm. The measured results show return losses of about -10 dB and nearly omni-directional radiation patterns. The proposed UWB antenna has advantages of easily adjustable impedance characteristics by the three angular parameters and easily accomplishable band rejection characteristics by the inverted T-slot.

Capacitively Loaded Loop Antenna Fed with Metamaterial Balun (Metamaterial 발룬으로 급전된 Capacitively Loaded 루프 안테나)

  • Jung, Youn-Kwon;Lee, Bom-Son
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.10
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    • pp.1084-1090
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    • 2009
  • This paper presents a balun consisting of a T-junction, a Right/Left Handed Transmission line(RLH-TL), and a conventional Right Handed(RH) line. It is assumed that the RLH-TL consists of N unit-cells. We provide closed-form solutions and design a very compact wideband(80 %) balun using CPW lines based on the obtained solutions. Then, we propose a capacitively loaded loop antenna designed for a uniform current distribution. The antenna resistance of the proposed antenna at resonance is about 204 ohms. The length of the unit cell is about $\lambda/12$(total length: $1\;\lambda$). The magnetic field generated from the proposed antenna is stronger than that of the conventional one by as much as 20 dB. We used a coplanar strip line(CPS) to combine the loop antenna and balun. The proposed antenna may be used as a near field UHF RFID reader antenna.

Design of $Ti:LiNbO_3$ Three-Waveguide Optical Switch with Outer-Waveguide Fed (바깥도파로 입사된 $Ti:LiNbO_3$ 세 도파로 광스위치의 설계 및 제작)

  • Kim, Young-Moon;Seo, Jung-Hoon;Huh, Chang-Yul;Kim, Chang-Min
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.36D no.6
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    • pp.61-70
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    • 1999
  • An optical switch composed of three-identical, equally-spaced $Ti:LinbO_3$ waveguides and overlaid Al electrodes of CPW structure was designed and fabricated. Patterned Ti was diffused into z-cut $LinbO_3$ substrates at $1025^{\circ}C$ for 6 hours to make a three-waveguide directional coupler. $SiO_2$ buffer layer of $1.2{\mu}m$ was grown by the PECVD to reduce the propagation loss of TM mode, and Al electrodes were built on the layer for switching the guided beam. For an incident beam of ${\lambda}=1.3{\mu}m$, almost perfect optical coupling between two outer waveguides was observed. When an electric field was applied to detune the three waveguides anti-symmetrically, the optical switching phenomenon was successfully confirmed.

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A Design of Wide-band Folded Dual Monopole Antennas (광대역 폴디드 이중 모노폴 안테나 설계)

  • Lee, Hyeon-Jin;Jung, Jin-Woo;Lim, Yeong-Seog
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.2
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    • pp.69-75
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    • 2007
  • In this paper, a single plane wide band microstrip antenna for integrated circuit is designed and fabricated. A new configuration for a wide bandwidth is proposed. This antenna consists of two folded microstrip monopoles, which are fed by a coplanar waveguide (CPW). Therefore In this paper is folded terminal part of dual microstrip line for variable reactance value. As a result compared the proposed folded dual microstrip monopole antenna with established dual microstrip monopole antennas, the proposed antenna can widen bandwidth more then about over 1[GHz. The characteristics of the proposed antenna were analyzed by using an FDTD methods. The proposed antenna has $1.98{\sim}4.05GHz$ bandwidth for using ISM, Wibro and DMB band.

A Study on Design of Microstrip Patch Antenna for Dedicated Short Range Communication (DSRC용 마이크로스트립 패치 안테나 설계 연구)

  • Park, Byeong-Ho;Choi, Yong-Seok;Seong, Hyeon-Kyeong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.2
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    • pp.393-400
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    • 2015
  • As the development and distribution of the intelligent transport system is spreading recently and some of the services are commercialized through a pilot project, interest in DSRC with high utilization is increasing and antennas for roadside and on board equipment are being studied. A single patch was used for a vehicle antenna due to the requests of miniaturization of size, but there was performance degradation in most cases due to miniaturization. In addition, some methods to improve performance have been used in the antennas that were previously researched using the arrays, but they have the disadvantages of bulkiness in size of the antennas when using the arrays. Therefore, in this paper, the CPW fed microstrip patch antenna with the simple structure of being compact and easy to produce, which can be used in the OBU of DSRC, was designed.

A Study on Design of Mobile Communication Microstrip Patch Antenna using PSO algorithm (PSO 알고리즘을 이용한 이동통신용 마이크로스트립 패치 안테나 설계에 관한 연구)

  • Kim, Myung-Dong;Park, Byeong-Ho;Seong, Hyeon-Kyeong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.8
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    • pp.1796-1803
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    • 2013
  • In this paper, a novel particle swarm optimization method based on IE3D is used to design a mobile communication microstrip patch antenna. The aim of the paper is to design and fabricate an inset fed rectangular microstrip antenna and study the effect of antenna dimensions length (L), width (W) and substrate parameters relative dielectric constant (${\varepsilon}r$), substrate thickness on radiation parameters of band width. PSO algorism was applied to IE3D, low resistance against, band width and advantage, were improved.

Studies on Miniaturization and Notched Wi-Fi Bandwidth for UWB Antenna Using a Wide Radiating Slot (넓은 방사 슬롯을 이용한 초광대역 안테나의 소형화와 Wi-Fi 대역의 노치에 관한 연구)

  • Beom, Kyeong-Hwa;Kim, Ki-Chan;Jo, Se-Young;Ko, Young-Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.2
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    • pp.265-274
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    • 2011
  • In this paper, it is studied on wide radiating slot antenna's miniaturization for ultra wide-band(UWB) technologies and notch structure to prevent interference between UWB systems and existing wireless systems for using Wi-Fi service of IEEE standards 802.11 a/n. Proposed antenna that wide slot is decreased from $\lambda/2$ to $\lambda/4$ length of resonant frequency has decreased by 72 % compared with conventional antenna. And optimized T-shaped CPW-fed stub has satisfied UWB bandwidth for 3.0~11.8 GHz. Then, creating 2-order Hilbert curve slot line in the stub's patch area, 4.9~5.6 GHz that centered frequency is 5 GHz is eliminated. Finally, the designed antenna constructed on FR4-epoxy has $20{\times}15\;mm^2$ dimension. The measured results that are obtained return loss under -10 dB through 3.2~11.8 GHz without Wi-Fi bandwidth, a linear phase characteristic, a stable group delay, and omnidirectional radiation patterns are presented.

Design of Active Antenna Diplexers Using UWB Planar Monopole Antennas (초광대역 평면형 모노폴 안테나를 이용한 능동 안테나 다이플렉서의 설계)

  • Kim, Joon-Il;Lee, Won-Taek;Chang, Jin-Woo;Jee, Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.9
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    • pp.1098-1106
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    • 2007
  • This paper presents active antenna diplexers implemented into an ultra-wideband CPW(Coplanar Waveguide) fed monopole antennas. The proposed active antenna diplexer is designed to direct interconnect the output port of a wideband antenna to the input port of two active(HEMT) devices, where the impedance matching conditions of the proposed active integrated antenna are optimized by adjusting CPW(Coplanar Waveguide) feed line to be the length of 1/20 $\lambda_0$(@5.8 GHz) in planar type wideband antenna. The measured bandwidth of the active integrated antenna shows the range from 2.0 GHz to 3.1 GHz and from 5.25 GHz to 5.9 GHz. The measured peak gains are 17.0 dB at 2.4 GHz and 15.0 dB at 5.5 GHz.