• Title, Summary, Keyword: Antenna

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Design of Circularly Polarized Array Antenna for 5.8GHz Microwave Wireless Power Transmission (5.8GHz 마이크로파 무선전력전송을 위한 원형 편파 배열 안테나 설계)

  • Lee, Seong Hun;Son, Myung Sik
    • Journal of the Semiconductor & Display Technology
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    • v.17 no.2
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    • pp.20-25
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    • 2018
  • In this paper, we have designed circularly polarized array antenna for 5.8GHz microwave wireless power transmission. To obtain high antenna gain, we studied a single patch antenna, a $2{\times}1$ array antenna, a $2{\times}2$ array antenna, a $2{\times}4$ array antenna, and a $4{\times}4$ array antenna. Commonly, characteristics of each antenna have a frequency of 5.8 GHz and Right Hand Circular Polarization(RHCP) of circular polarization. Also, the results were obtained with the design to each antenna that the return loss was less than -10dB and the axial ratio was less than 3dB. The gain of the antennas was 6.08dBi for a single patch antenna, 9.69dBi for a $2{\times}1$ array antenna, 12.99dBi for a $2{\times}2$ array antenna, 15.72dBi for a $2{\times}4$ array antenna and 18.39dBi for a $4{\times}4$ array antenna. When the elements of the array antenna were increased, it was confirmed that it increased by about 3dBi.

Design of the Pattern Adjustable Base Station Antenna for WCDMA Applications

  • Lee, Sang-Ho;Lee, Jung-Nam;Lee, Don-Shin;Park, Jong-Kweon;Kim, Hak-Sun
    • Journal of electromagnetic engineering and science
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    • v.8 no.2
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    • pp.64-69
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    • 2008
  • In this paper, we have proposed the pattern adjustable base station antenna for WCDMA applications. The proposed antenna consists of an omni-antenna(sleeve monopole) and two movable reflectors. The two reflectors can be controlled by mechanically and used to adjust the horizontal pattern of the base station antenna. The antenna was designed, fabricated, and measured. The antenna covers the entire WCDMA band for VSWR<1.4. The measured antenna gain is more than 15 dBi over the operating frequency range. By changing the angle (a) and the distance (d) of the antenna, the pattern adjustment of the proposed base station antenna is found to be possible.

Modeling and Design of Medium-wave DGPS Monopole Antenna (DGPS를 위한 중파대역 모노폴 안테나 모델링 및 설계)

  • Na, Sang-Geun;Lee, Su-Won;Kim, Young-Wan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.4
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    • pp.797-804
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    • 2014
  • The experimental design method based-on the measured data in the several LF monopole antenna was used in MF monopole antenna design. The design technique is also utilized in MF DGPS antenna design. It is not possible to predict the antenna performance of the MF short-monopole antenna because of simple experimental antenna design. Furthermore, it is difficult to design and analyze the various wired short-monopole antenna. The antenna models for performance analysis of the DGPS antenna with the various wired short-monopole structure are proposed in this paper. Based on the proposed antenna models, also, the antenna performance and design data of the wired short-monopole antennas are presented. To evaluate the validity of the analyzed antenna models, the wired short-monopole antenna for 100 kHz are modeled and analyzed. The antenna performance of the wired short-monopole antenna are compared with those of the previously presented LF antenna performance. Based on the evaluation for proposed antenna analyzing models, the DGPS wired short-monopole antennas are modeled and analyzed.

Compact and Wideband Fylfot-Shaped Planar Monopole Antenna

  • Shim, Jae-Ruen
    • Journal of information and communication convergence engineering
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    • v.7 no.4
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    • pp.449-452
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    • 2009
  • In this paper, a novel compact and wideband fylfot-shaped planar monopole antenna is proposed. The fylfot-shaped is suggested to reduce the volume of a general crossed planar monopole antenna. The volume of the proposed antenna is about 1/4 of a general crossed planar monopole antenna under the conditions where the wideband characteristics are maintained. This technique is suitable for the design of wideband planar monopole antenna which needed a small volume.

Antenna factors of short dipole antennas with roberts balun (Roberts밸런을 갖는 단축 다이폴 안테나의 안테나 인자)

  • 김기채
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.3
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    • pp.532-538
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    • 1997
  • Exactly aclculated antenna factors are requeired for determining EMI levels in an actual radiated emission test. In this paper, the antenna factors of short dipole antennas above the ground plane are calculated theoretically for the antenna with Roberts balun specified ANSI C63.5 regulation. Also treated is a half-wavelength dipole antenna with Roberts balun to compare the antenna factors with those of resonant dipole antenna. In formulationof antenna factors the antenna is treated as the boundary value problem of Maxwells equations and is analyzed by the Galerkins method of moments. The balun is treated using circuit theory based on power transmission mismatch.

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The Design of Rectangular Microstrip Patch Antenna Using The Ring Feed Line (링 급전선로를 이용한 Rectangular Microtrip Patch Antenna 설계)

  • 고영혁;양규식;이종악
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.14 no.5
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    • pp.435-441
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    • 1989
  • The three rectangular microstrip patch antenna of Resonant length, lambda/2 or , between two slot is designed by using the ring feed line, and the radiation pattern characteristic is showen. In case of the antenna of resonant length lambda/2 the radation pattern is shown at each antenna element, in the antenna of resonant length it is shown among patch antenna element.

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Antenna Design with Combination of Electric-Magnetic Radiators for RFID System

  • Kim, Yong-Jin
    • Journal of electromagnetic engineering and science
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    • v.10 no.3
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    • pp.79-85
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    • 2010
  • In this paper, a directive antenna design with a combination of electric-magnetic radiators for an radio frequency identification(RFID) system is presented. To generate a directive antenna radiation pattern, a structure combining a dipole and loop antenna is presented. A reader antenna and tag antenna are proposed for the RFID system. For the reader antenna, the frequency bandwidth defined by $S_{11}$<-10 dB is approximately from 820~990 MHz. The forward and backward gain differences are 1.5~2 dBi. For the tag antenna, the frequency bandwidth is approximately from 860~920 MHz with a maximum gain of 3.58 dBi at 910 MHz. In both cases, directive radiation characteristics are observed.

Size Reduction of HF Whip Antenna (HF 휩 안테나의 소형화)

  • Lim, Ji-Hun;Lee, Young-Jin;Kim, Young-Jun;Choi, Sung-Jun;Jeon, Wo-Won;Park, Dong-Kook
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.65-66
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    • 2012
  • For HF antenna, whip antenna with 6m length or more has been used generally. In this paper, we suggest a new HF antenna which is smaller than commercial HF whip antenna. The shape of the proposed antenna is "ㄷ" and the size of the antenna is $1m{\times}2m$. The feature of the antenna has been simulated by NECWin tools.

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The Design of Tx 30GHz/ Rx 20GHz Dual Feeding Circular Polarized Patch Antenna Using LTCC Process (LTCC 공정을 이용한 송신 30GHz/수신 20GHz 이중급전 원형편파 패치 안테나 설계)

  • 김성남;오민석;천영민;최재익;표철식;이종문;천창율
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.8
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    • pp.448-454
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    • 2004
  • In this paper, circular polarized antennas of Tx 30GHz and Rx 20GHz are implemented in LTCC process. Tx antenna has a circular patch structure and Rx antenna has a ring patch structure. The feeding line of Tx antenna is placed in the center hole of Rx ring patch antenna which is printed under Tx circular patch antenna layer. It makes antenna size smaller. Tx antenna's return loss in under -l0dB level from 30GHz to 31GHz and Rx antenna is under -10 dB from 20GHz to 21GHz. The isolation between two antennas is less than -20dB. Axial ratio is less than 3dB thoughout each band.