• Title/Summary/Keyword: Planar Antenna

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Miniaturization of UHF Planar Antenna Employing Slot-loading (Slot-loading에 의한 UHF 대역 평면 안테나의 소형화 설계)

  • Chun, Joong-Chang;Lee, Dong-Hyun;Kim, Tae-Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2008.05a
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    • pp.685-688
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    • 2008
  • Planar antennas are very efficient for the use of the out-door data transmission applications due to their low-profile characteristics. But the size of the antenna in UHF band blocks the practical usage. In this paper, a miniaturized planar antenna is investigated for the application of AMR system in UHF band. The designed antenna is fabricated in the form of the microstrip patch on the FR-4 substrate. The miniaturization is achieved by slot-loading on the patch. First, effects of simple slots on the size reduction are analyzed, followed by the design using more complex slots resulting in the reduction ratio of 37.9% in 425.6 MHz and bandwidth of 3.8 MHz. The effect of epoxy coating for the protection is also investigated.

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Band-Rejected UWB Antenna Using Unit Cells of FSS (FSS 단위 셀을 이용한 대역저지 UWB 안테나)

  • Lee, Chang Yong;Jung, Chang Won
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.7
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    • pp.3431-3436
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    • 2013
  • Band-notched ultra-wideband (UWB) antennas using frequency selective surfaces (FSSs) are presented. The proposed antennas utilized the band rejection characteristic of typical FSS unit cells. We loaded the FSS unit cells on the same plane of planar UWB antenna. These antennas are designed to reject the interference from the wireless local area network band, 5.15-5.825 GHz in the UWB band, 3.1-10.6 GHz. The measured peak gains of the proposed antennas are more than 2 dBi at both operation edge and center frequencies, and sufficient to apply for commercial purpose. The antennas are small size and planar shape for the purpose of the small mobile application, and enhanced design freedom by using various existing FSS unit cells.

Miniaturization of UHF Planar Antenna Employing Slot-loading (슬롯 장하에 의한 UHF 대역 평면 안테나의 소형화 설계)

  • Chun, Joong-Chang;Lee, Dong-Hyun;Kim, Tae-Soo;Kim, Hyun-Deok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.6
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    • pp.979-983
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    • 2008
  • Planar antennas are very efficient for the use of the out-door data transmission applications due to their low-profile characteristics. But the size of the antenna in UHF band blocks the practical usage. In this paper, a miniaturized planar antenna is investigated for the application of AMR system in UHF band. The designed antenna is fabricated in the form of the microstrip patch on the FR-4 substrate. The miniaturization is achieved by slot-loading on the patch. First, effects of simple slots on the size reduction are analyzed, followed by the design using more complex slots resulting in the reduction ratio of 37.9% in 425.6 MHz and bandwidth of 3.8 MHz. The effort of epoxy coating for the protection is also investigated.

Study of FEM with integrated antenna (안테나를 집적한 FEM에 대한 연구)

  • Kim Jun-Kyu;Kang Sung-Won;Cheon Chang-Yul
    • 한국정보통신설비학회:학술대회논문집
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    • 2006.08a
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    • pp.189-192
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    • 2006
  • 본 논문에서는 안테나와 미국 PCS대역(1.85GHz-1.99GHz) FEM(Front End Module)을 결합하여 하나의 패키지로 구현하는 것을 연구하였다. FEM의 크기를 고려하여 안테나의 크기를 작게 만들고 단말기에 내장하기 위해 PIFA(Planar Inverted F Antenna)형식의 안테나를 선택하였다. 안테나의 지지를 위해 비유전율 2의 캐리어를 사용하였고, 안테나와 FEM간의 상호 간섭을 막기 위해 도체로 차폐시켰다. 유한요소법(Finite Element Method)로 모의 실험을 하여 안테나를 설계하고 실제 제작하여 모의 실험결과와 비교하였다. 제작한 안테나를 FEM과 결합, 기판을 제작하여 FEM의 이득을 측정하였다.

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Analysis of Arbitrarily-Shaped Microstrip Antenna in Multi-Layered (다층 유전체에서 임의의 형상을 갖는 마이크로스트립 안테나의 해석)

  • Kim, Sang-Jin;Kim, Young-Sik;Cheon, Chang-Yul
    • Proceedings of the KIEE Conference
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    • 1998.07e
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    • pp.1821-1823
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    • 1998
  • In this paper, arbitrarily-shaped microstrip patch antenna in multi-layered is analyzed using spatial domain MoM. The triangular patch function is adopted here as the expansion function for planar arbitrarily-shaped microstrip. For example, an edge-fed rectangular patch antenna on a single-layered substrate is analyzed. The results show the agreement between the calculation and measurement.

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Small-sized Planar Spiral Monopole Antennas by Using Parasitic Elements (기생소자에 의한 소형 평면 맴돌이형 모노폴 안테나)

  • Lee Hyun-Kyu;Lee Taek-Kyung;Jang Won-Ho;Kang Yeon-Duk
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.6 s.97
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    • pp.563-570
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    • 2005
  • In this paper, a small-sized planar square-spiral monopole antenna is proposed by using parasitic elements. The Parasitic element is composed of a crossed strip and additional right-angle folded(L-type) stirps. And these parasitic elements are printed on a substrate which is the opposite side of a radiation element . When the parasitic elements are used, the size of the square-spiral monopole antenna is reduced by $32\%$ for the same operating frequency compared to the antenna without parasitic elements. The radiation pattern of the proposed antenna is nearly omni-directional in azimuth. The designed antenna can be used in the application of channel 12 digital mulimedia broadcasting(DMB) handset.

Improvement of Radiation Performance of Mobile Phone Antenna Using PIFA on U-Shaped Ground Plane (U-형 접지면 상에 배치된 평판형 역 F 안테나 구조를 이용한 휴대폰 단말기의 무선 성능 개선)

  • Lee, Jeong-Ho;Song, Jae-Kwan;Yook, Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.1
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    • pp.90-97
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    • 2010
  • In this paper, we propose antenna topology and ground plane shape to improve the performance of PIFA (Planar Inverted F Antenna) which is built-in mobile phone. First, we designed the PIFA antenna consists of multiple radiators to provide multi-current paths. Then we designed U-shaped ground plane on the PCB under the antenna. The proposed antenna structure shows TRP/TIS improvement of 2.0 dB/3.7 dB for GSM and 2.2 dB/ 2.0 dB for DCS and 0.8 dB/1.5 dB for PCS and 1.3 dB/0.7 dB for WCDMA at the free space.

Design of a Planar Antenna with Monopole-like Radiation Pattern for On-Body Communications (수직 모노폴 방사패턴을 갖는 인체표면 통신용 평면형 안테나 설계)

  • Kwon, Jaekwang;Woo, Seungmin;Tak, Jinpil;Choi, Jaehoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.26 no.4
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    • pp.365-373
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    • 2015
  • In this paper, a planar antenna with monopole-like radiation pattern for on-body communications is proposed. The proposed antenna consists of three split-rings(SR) to generate a monopole-like radiation characteristic. To account for the on-body application, the proposed antenna is designed to have a low-profile. The antenna has an overall dimensions of $0.29{\lambda}_0{\times}0.29{\lambda}_0{\times}0.008{\lambda}_0$ at 5.8 GHz industrial, scientific, and medical(ISM) band(5.725~5.875 GHz). To verify the body effect, a two-thirds muscle equivalent semi solid phantom is fabricated and used to measure the antenna performance. The 10-dB return loss bandwidth is 280 MHz(5.68~5.96 GHz) and the measured peak gain is 1.91 dBi.

Design and Implementation of UWB Antenna with Band Rejection Characteristics (대역저지 특성을 갖는 초광대역 안테나 설계 및 구현)

  • Yang, Woon Geun;Nam, Tae Hyeon;Yu, Jae Seong;Oh, Hee Oun
    • Journal of Advanced Navigation Technology
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    • v.22 no.1
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    • pp.31-36
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    • 2018
  • In this paper, we designed and implemented an ultra wideband(UWB) antenna with band rejection characteristics. The proposed antenna consists of a planar radiation patch with slots and ground planes on both sides. Due to the slots in the radiation patch, the antenna shows band rejection characteristics. U-type slot contributes for wireless local area network(WLAN, 5.15~5.825 GHz) band rejection and n-type slot contributes for X-Band(7.25~8.395 GHz) band rejection. To make voltage standing wave ratio(VSWR) less than 2.0 for UWB frequency band except rejection bands, the shapes of planar radiation patch and ground plane was modified. The Ansoft 's high frequency structure simulator(HFSS) was used for the design process and simulations of the proposed antenna. The simulated antenna showed VSWR less than 2.0 for all UWB band excepts for dual rejection bands of 5.15 ~ 5.94 GHz and 7.02 ~ 8.45 GHz. And measured VSWR for the implemented antenna is less than 2.0 for all UWB band of 3.10~10.60 GHz excluding dual rejection bands of 5.12~5.95 GHz and 7.20~8.58 GHz.

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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