• Title/Summary/Keyword: Antenna

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Design of Implantable Rectangular Spiral Antenna for Wireless Biotelemetry in MICS Band

  • Lee, Jae-Ho;Seo, Dong-Wook;Lee, Hyung Soo
    • ETRI Journal
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    • v.37 no.2
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    • pp.204-211
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    • 2015
  • For this study, we designed an implantable rectangular spiral antenna for medical biotelemetry in the Medical Implant Communications Service band (402 MHz to 405 MHz). The designed antenna has a U-shaped loop for impedance matching. The antenna impedance is easily adjusted by controlling the shape and length of the U-shaped loop. Significant design parameters were studied to understand their effects on the antenna performance. To verify the potential of the antenna for the desired applications, we fabricated a prototype and measured its performance in terms of the resonant characteristics and gain radiation patterns of the antenna. In the testing phase, the prototype antenna was embedded in human skin tissue-emulating gel, which was developed to simulate a real operation environment. The measured resonant characteristics show good agreement with the simulations, and the -10 dB frequency band is within the range of 398 MHz to 420 MHz. The antenna exhibits a maximum gain of -22.26 dBi and an antenna efficiency of 0.215%.

Design and Implementation of Koch curve Microstrip Patch Antenna for Antenna Miniaturization (안테나 소형화를 위한 koch curve 마이크로스트립 패치 안테나 설계 및 구현)

  • Kim, Sun-Woong;Lim, Dong-Seob;Kim, Young-Gon;Choi, Dong-You
    • Journal of Information Technology Services
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    • v.12 no.3
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    • pp.323-330
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    • 2013
  • In this paper, miniaturized patch antenna operating at ISM band has been designed by applying the fractal technique. Various type of antenna structure, microstrip patch antenna and koch curve microstrip patch antenna has been proposed and simulated using Ansoft HFSS (High Frequency Structure Simulator). The area of microstrip patch antenna and koch microstrip patch antenna is 1,058 $mm^2$, and 891 $mm^2$ respectively, showing the size reduction ratio of 16%. The finally made koch curve microstrip patch antenna resonates at 2.45GHz with return loss of 22.69dB, VSWR of 1.2142, and antenna radiation gain of 3.26dBi.

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.

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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Design of a Compact Antenna Array for Satellite Navigation System Using Hybrid Matching Network

  • Lee, Juneseok;Cho, Jeahoon;Ha, Sang-Gyu;Choo, Hosung;Jung, Kyung-Young
    • Journal of Electrical Engineering and Technology
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    • v.13 no.5
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    • pp.2045-2049
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    • 2018
  • An antenna arrays for a satellite navigation systems require more antenna elements to mitigate multiple jamming signals. In order to maintain the small array size while increasing the number of antenna elements, miniaturization technique is essential for antenna design. In this work, an electrically small circular microstrip patch antenna with a 3 dB hybrid coupler is designed as an element antenna, where the 3 dB hybrid coupler can yield the circularly polarized radiation characteristic. The miniaturized element antenna typically has too large capacitance in GPS L1 and GLONASS G1 bands, making it difficult to match with a single stand-alone non-Foster matching circuit (NFMC) in a stable state. Therefore, we propose a new matching technique, referred to as the hybrid matching method, which consists of a NFMC and a passive circuit. This passive tuning circuit manages reactance of antenna elements at an appropriate capacitance without a pole in the operating frequency range. The antenna array is fabricated, and the measured results show a reflection coefficient of less than -10 dB and an isolation of greater than 50 dB. In addition, peak gain of the proposed antenna is increased by 22.3 dB compared to the antenna without the hybrid matching network.

Parallel-fed Multiple Loop Antenna for 13.56MHz RFID Reader

  • Yang Woon Geun;Park Yong Ju;Kim Hyuck Jin;Cho Jung Min;Kim Jung Ho
    • Proceedings of the IEEK Conference
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    • pp.334-338
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    • 2004
  • In this paper, we suggest a new antenna structure for RFID(Radio Frequency IDentification) reader. Conventional RFID reader uses a loop antenna. The central area of a loop antenna shows a low magnetic field strength especially for the case of a large loop antenna diameter. We propose a parallel-fed multiple loop antenna. Simulation results and measured results show that we can adjust field distribution with the number of turns and diameter of an inner loop antenna to obtain a longer reading distance. Simulation results for the specific case of a proposed antenna structure show that at the center point of a proposed parallel-fed multiple loop antenna, the typical card area averaged magnetic field strength is 2.53A/m, which is higher than the case of a conventional type single loop antenna of 0.44A/m and the case of a series-fed multiple loop antenna of 0.96A/m when we drive with same source signal. We realized the antenna for the case of 13.56MHz RFID reader and the performance of reading distance was much more improved than the case of a conventional antenna.

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Compact GPS Patch Antenna Using Variable Capacitor (가변 캐패시터를 이용한 초소형 GPS 패치 안테나)

  • Kim, Ki-Nam
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39C no.3
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    • pp.282-288
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    • 2014
  • Recently there have been much interest in the GPS antenna performance improvement. In this paper, we propose very small patch antenna for GPS band. The proposed antenna resonance frequency was adjusted using the ground plane and variable capacitor connected the frame. The fabricated antenna was used a FR4 substrate by considering the difficulty and economical efficiency. Antenna measurement results was obtained good characteristics of VSWR 1.2, the passive antenna gain -0.60 dBi, the active antenna gain of 29 dB in center frequency of 1575.42 MHz GPS band.

Radiation Characteristics of Broadband Folded Cross Monopole Antennas (광대역 폴디드 십자형 모노폴 안테나의 복사 특성)

  • Park, Yong-Uk;Choi, Hak-Keun
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.307-312
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    • 2005
  • In this paper, the broadband FCMA(Folded Cross Monopole Antenna), which is the cross monopole antenna with the folded element, is presented. To investigate the broadband characteristics of FCMA the VSWR, the gain, and the radiation pattern are calculated in frequency between 1.75 GHz and 2.655 GHz. From the calculated result, it is shown that the presented folded cross monopole antenna has a excellent band characteristics than the existing cross monopole antenna. The presented antenna is conformed as a broadband antenna which can be used for the indoor antenna of PCS, WCDMA, Wibro, and satellite DMB band.

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Design and Analysis of Composite Surface-Antenna-Structure for the Satellite Communication (위성통신을 위한 복합재료 표면안테나 구조의 설계 및 해석)

  • 유치상;황운봉;박현철;박위상
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.1-4
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    • 2002
  • The present study aims to design a multiplayer microstrip antenna with composite sandwich construction and to estimate structural behavior of this multiplayer structure for the next generation of structural surface technology. This is termed Surface-Antenna-Structure indicating that structural surface becomes antenna. Constituent materials were selected considering electrical properties as well as mechanical properties. For the antenna performance, antenna elements inserted into structural layers were designed for satellite communication at a resonant frequency of 12.5 GHz and final demonstration article was $16\times16$ array antenna. From electrical measurements it was shown that antenna performances were in good agreement with design requirements. Structural analysis showed this antenna structure was well designed for the mechanical rigidity. All constituent materials were characterized independently. The SAS concept is the first serious attempt at integration for both antenna and composite engineers and promises innovative future communication technology.

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