• Title, Summary, Keyword: spiral antenna

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Miniaturization of an Ultra-Wideband Antenna with Two Spiral Elements

  • Hong, Seok-Jin;Choi, Jae-Hoon
    • ETRI Journal
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    • v.31 no.1
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    • pp.71-73
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    • 2009
  • In this letter, novel antennas with two spiral elements are presented for ultra-wideband application. The original antenna consists of a T-shaped microstrip feed line, two spiral radiating elements, and a ground plane with two circular slots. It measures 30 mm ${\times}$ 40 mm ${\times}$ 1.6 mm. Spiral elements are used to increase the lower bandwidth limit. To further reduce the size of the antenna, the original antenna is cut in half by using the symmetry of the surface current distributions. The proposed antennas feature omnidirectional radiation patterns and good gain flatness.

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Cavity-backed Two-arm Spiral Antenna with a Ring-shaped Absorber for Partial Discharge Diagnosis

  • Kim, Han-Byul;Hwang, Keum-Cheol;Kim, Hyeong-Seok
    • Journal of Electrical Engineering and Technology
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    • v.8 no.4
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    • pp.856-862
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    • 2013
  • A cavity-backed two-arm spiral antenna for partial discharge diagnosis is presented. The proposed antenna consists of a two-arm Archimedean spiral, a tapered microstrip balun as spiral antenna feed, and a ring-shaped absorber-loaded cavity. The Archimedean spiral antenna is designed for the operating frequency band of 0.3 GHz to 1.5 GHz and fed by the tapered microstrip balun. The cavity is utilized to transform the bidirectional beam into a unidirectional beam, thereby enhancing gain. The ring-shaped absorber is stacked in the cavity to reduce the reflected waves from the cavity wall. The proposed antenna is designed and simulated using CST Microwave Studio. A prototype of the proposed antenna is likewise fabricated and tested. The measured radiation patterns are directional to the positive z-axis, and the measured peak gain is 8.13 dBi at a frequency of 1.1 GHz.

Analysis and Design of a Spiral Antenna using Moment Method (모먼트법을 이용한 스파이럴 안테나의 해석 및 설계)

  • 한정세;이갑수;박병우
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.5
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    • pp.857-871
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    • 1994
  • In this paper, six kinds of spiral antenna, a combination of two types of spiral arm-width and three types of spiral curvature are analyzed by using moment method. Dividing spiral arms into N sections, the current distribution is calculated by Galerkin`s method. The radiation pattern and the antenna gain are derived from antenna currents. All os the six spiral antenna have amni-dirctional and wide-band characteristics, although the antenna gain changes within +_ 5dB bound for operating range(600MHz-2GHz). The variation of antenna`s gain is caused by the return loss in connection the Balun to the antenna. Simulation and experimental results on the radiation pattern also show spiral antennas have omni-directional and wide-band characteristics.

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A Study on Folded Monopole Antenna with Spiral Shape for Wireless DVI Dongle Applications (무선 DVI 동글장치를 위한 스파이럴 구조를 갖는 폴디드 모노폴 안테나에 관한 연구)

  • Lee, Jae-Choon;Lee, Yun-Min
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.1
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    • pp.72-75
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    • 2016
  • In this paper, we proposes a internal antenna for wireless DVI dongle device using the folded monopole structure. The proposed antenna uses a basic structure of spiral and monopole. The antenna optimized for parameters length, gap, width, and rectangle of folded monopole antenna using the spiral structure. To confirm the characteristics of the antenna parameters, HFSS from ANSYS Inc. was used for the analysis. We used an FR4 dielectric substrate with a dielectric constant of 4.4. The DVI dongle size of the proposed antenna is $50{\times}40{\times}1.6mm$, and the size of the antenna area is $10{\times}40mm$. There is a value of return loss less then -10dB in 2.4GHz and 5.8GHz, band and the maximum antenna gain is -4.13dBi. The utilization possibility of the wireless DVI Dongle antenna have a folded monopole with spiral shape could be confirmed according to compare and analyze the simulation and measurement data.

Self-Complementary Spiral Antenna Design Using a Ultra-Wideband Microstrip-to-CPS Balun (초광대역 마이크로스트립-CPS 발룬을 이용한 Self-Complementary 스파이럴 안테나 설계)

  • Woo, Dong-Sik;Kim, Young-Gon;Cho, Young-Ki;Kim, Kang-Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.2
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    • pp.208-214
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    • 2009
  • A design and its experimental result of a wideband self-complementary spiral antenna for UWB USPR(Ultrashort-Pulse Radar) system applications is presented. By utilizing the planar-type ultra-wideband microstrip-to-CPS balun, ultra-wideband characteristics of the inherent spiral antenna are retrieved. Also, the design procedure of the spiral antenna is simplified by performing simple impedance matching between separately designed balun and antenna. The proposed spiral antenna is equiangular self-complementary spiral antenna. The implemented antenna demonstrates widebaad performance for frequency ranges from 2.9 to 12 GHz with the relatively flat antenna gain of 2.7 to 5.3 dB and broad beamwidth of more than $70^{\circ}$. From these result, the possibility of a spiral antenna using a ultra-wideband microstrip-CPS balun is verified.

A Superconducting $Y_1Ba_2Cu_3O_{7-\delta}$ Square Spiral Microstrip Antenna

  • Jung, Sung-H.;Song, Ki-Y.
    • Progress in Superconductivity
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    • v.2 no.1
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    • pp.51-55
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    • 2000
  • A $Y_1Ba_2Cu_3O_{7-\delta}$ square spiral microstrip antenna (YBCO antenna) was epitaxially grown on a $LaAlO_3$ substrate by laser ablation. Also fabricated was a gold square spiral microstrip antenna (gold antenna) having the same structure as that of the YBCO antenna in order to compare the properties of both antennas. Both the YBCO antenna and the gold antenna were operated in Ku (12-18 GHz) band, and their properties such as the return loss, SWR, power gain, and radiation patterns were investigated at 77 K. The return loss below -10 dB was obtained in two frequency ranges, i.e., 14.05-14.90 GHz, and 16-18 GHz for the YBCO antenna at 77 K (YBCO superconducting antenna), and in the frequency range of 15.05-17.60 GHz for the gold antenna at 77 K. The SWR bandwidths are 0.85 GHz and 2 GHz for the YBCO superconducting antenna, and 2.55 GHz for the gold antenna at 77 K. The gain improvement of the superconducting YBCO antenna over the gold antenna at 77 K was about 10 dB in the frequency range of 16 GHz to 18 GHz. The radiation patterns show the YBCO superconducting antenna has the omni-directional property of a spiral antenna.

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Design of PIFA type Spiral Antenna for Vehicle RKE Reader (차량 RKE 리더기용 PIFA형 스파이럴 안테나의 설계)

  • Oh, Dong-Jun;Yun, Ho-Jin;Jeong, Bong-Sik
    • Journal of the Institute of Convergence Signal Processing
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    • v.9 no.2
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    • pp.135-140
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    • 2008
  • In this paper, the spiral antenna with the center frequencies of 315MHz, 433MHz, and 447MHz for RKE system of a vehicle is designed on PCB. The antenna is microstrip line-fed, and applied PIFA concept near the feeding part to easily tune center frequency and input impedance. The PIFA-type spiral antenna with the size of $30mm{\times}20mm$ is designed on printed PCB by considering the effect of circuits and components on PCB, ECU case and vehicle body. Also chip inductor inserted dual-band spiral antenna of 315MHz and 447MHz is designed. We found that the antenna designed on PCB satisfied the antenna specifications through measurement and field test.

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Design for High Gain Spiral Antenna by Added Conical Cavity Wall

  • Jeong, Jae-Hwan;Min, Kyeong-Sik;Kim, In-Hwan
    • Journal of electromagnetic engineering and science
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    • v.13 no.3
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    • pp.165-172
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    • 2013
  • This paper describes a design for a spiral antenna with a conical wall to obtain the high gain. The gain and the axial ratio of the spiral antenna were improved by a new design that included a conical wall and an optimized Archimedean slit on the ground plane in a conventional antenna with a circular cavity wall and a 4.5-turn slit. A gain improvement of 9.5 dBi higher and a good axial ratio of 1.9 dB lower were measured by the added conical wall and the newly designed slit from the current distribution control on the ground plane, respectively. The measured return loss, gain and axial ratio of the proposed antenna showed a good agreement with the simulated results. The proposed antenna will be applied to a non-linear junction detector system.

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%.

Single Spiral CPW Antenna with Three Stubs for Mobile Communication (3개의 스터브를 가진 이동통신용 단일 나선형 CPW 안테나)

  • Shin, Ho-Sub;Choi, In-Tae
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.903-905
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    • 2013
  • In this paper, we propose the CPW antenna with a spiral geometry for miniaturization. Widths of a spiral line are constant, and three stubs are added to broaden bandwidth. Proposed antenna is designed. Lengths and widths of three stubs are gradually changed and optimized.

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