• Title/Summary/Keyword: 안테나 급전 구조

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Design of a Internal Loop Antenna for Multi-band Mobile Handset Applications (다중 대역 이동 통신 단말기용 내장형 루프 안테나 설계)

  • Lee Young-Joong;Lee Jin-Sung;Jung Byungwoon;Park Myun-Joo;Lee Byungje
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.9 s.100
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    • pp.917-925
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    • 2005
  • In this paper, the quad-band antenna for mobile handsets is proposed and developed. The operating frequency bands include GSM(880 MHz${\~}$960 MHz), GPS(1,575 MHz$\pm$10 MHz), DCS(1,710 MHz${\~}$l,880MHz), and PCS(1,850 MHz${\~}$l,990 MHz). The proposed antenna consists of a feed line, a shorting post, and a radiating element of the feed loop. The multi-band operation is achieved by using the fundamental and higher resonant modes of the radiating element. Based on analysis of the current distribution on the radiator, the resonant frequency of each mode can be adjusted by adding the different sizes of slots on the radiator. The radiator of the feed loop is designed to be symmetrical so that the energy is symmetrically distributed on the radiator, which results in omni-directional radiation pattern. The ground plane under the radiator is removed in order to improve the bandwidth. The measured impedance bandwidths are $10.1\%$ in GSM band(VSWR<2.5), $26.8\%$ in GPS band, and DCS/US-PCS bands(VSWR<2.5), respectively. The maximum gains on the H-plane of the fabricated antenna are measured about -0.37 dBi${\~}$2.55 dBi for all operating frequency bands.

Design and Fabrication of Right Hand Circular Polarization Microstrip Patch Array Antenna for Ka Band with Mono-Pulse Feed (모노펄스 급전 구조를 갖는 Ka 대역 우회선 원편파 마이크로스트립 패치 배열 안테나 설계 및 제작)

  • Bae, Ki-Hyoung
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2005.11a
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    • pp.297-302
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    • 2005
  • Right hand circularly polarized Ka band microstrip patch array antenna was designed, manufacture and measurement were carried out. In order to lower axial ratio performance sequential rotation array technique was used. With mono-pulse feed There are sum and delta channel. Waveguide to microstrip transition was used. The 512 array antenna was performed which axial ratio is about 1.ldB in the half power beam width and also 1.ldB at the normal direction. Directivity gain of designed antenna is 32dB.

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Reconfigurable beam steering U-slot patch antenna with high gain for a wireless headset (무선 헤드셋용 고이득 재구성 빔 스티어링 U-slot 패치 안테나)

  • Kang, Seonghun;Yeom, Insu;Jung, Changwon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.9
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    • pp.5796-5800
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    • 2014
  • This paper presents reconfigurable beam steering patch antenna with high gain for a wireless headset. Because existing antenna for wireless communication in headsets has an omni-directional radiation pattern, it has a deleterious effect in the vicinity of the human head. To reduce this effect, this paper proposed an antenna comprised of a U-slot and manufactured on a FR-4 substrate. The antenna operating at the 2.37-2.5 GHz band used a tapered matching method to match the impedance between the feed part and patch part. To implement the beam steering capability, the antenna used two PIN diodes. Using PIN diodes, the antenna presented three states ($S_0$, $S_1$ and $S_2$) in the maximum beam directions of the YZ-plane ($0^{\circ}$, $30^{\circ}$ and $330^{\circ}$, respectively). The peak gains of the antenna in the headset were 4.22-5.15 dBi. The fabricated antenna could communicate efficiently with a wireless headset.

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.

A triple band printed monopole antenna with a bent branch strips for WiFi / 5G (와이파이 및 5G용 굽은 가지 스트립을 가진 삼중대역 인쇄형 모노폴 안테나)

  • Min-Woo Kim;Dong-Gi Shin;Oh-Rim Ryu;Young-Soon Lee
    • Journal of Advanced Navigation Technology
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    • v.25 no.6
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    • pp.536-542
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    • 2021
  • In this paper, we proposed a triple band printed monopole antenna with a bent branch strips for WiFi / 5G. An antenna structure in which bent strips for generating multiple resonance are attached in the form of branches was newly proposed based on a typical monopole strip vertically erected as a triple band antenna structure. The proposed antenna is designed on a FR-4 substrate with dielectric constant 4.3, thickness of 1.6 mm, and size of 28×40 mm2. The measured impedance bandwidth is 430 MHz (2.22~2.65 GHz) in the 2.4 GHz WLAN, 450 MHz (3.38~3.83 GHz) in the 3.5 GHz and 2390 MHz (4.95~7.34 GHz), In particular, it has been observed that antenna has a stable omnidirectional radiation patterns as well as gain of 1.537 dBi, 1.878 dBi and 2.337 dBi in the entire frequency band of interest.

Band-Broadening Design of the Butler Matrix for V2X - 5.9 GHz Communication (V2X 차량 통신용 5.9 GHz 버틀러 매트릭스의 광대역화 설계)

  • Han, Dajung;Lee, Changhyeong;Park, Heejun;Kahng, Sungtek
    • Journal of Satellite, Information and Communications
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    • v.11 no.4
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    • pp.107-113
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    • 2016
  • In this paper, we suggest a design method of a wide-band Butler matrix working at 5.9 GHz for V2X communication antennas. Since V2X communication needs beam-forming and beam-steering antennas to make transportation systems, mobile comm platforms, saturated frequency-resources, and signal TX-and-RX smart, multi-functional, resolved, and efficient utmost, respectively, the proper Butler matrix and its radiating elements as a low-profile geometry are realized. The constitutive components of the basic Butler matrix of a narrow band are designed first. And then, it is extended to a wide-band version to make its frequency-shift less affected by the event of the antenna system being mounted on a car body. The beam-forming and beam-steering performance is presented as the common feature tagged along with the different bandwidths of the frequency responses as the comparison between the narrow- and wide-band cases.

Design and Fabrication of Wireless LAN for Miniaturized Microstrip Antenna (소형화를 위한 무선랜 대역의 마이크로스트립 안테나 설계 및 제작)

  • Lee Won-Jong;Kim Yong-Kyun;Kang Suk-Youb;Lee Hwa-Choon;Yoon Cheul;Park Hyo-Dal
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.9A
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    • pp.906-912
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    • 2006
  • In this paper, N-shaped slot antenna for $5.15GHz{\sim}5.35GHz$ is designed, fabricated, and measured. The prototype consist of meander corrugated N-shaped slot. To obtain suitable bandwidth, the form layer is inserted between ground plane and substrate. Important parameters in the design are N-slot length, width, position, air-gap height, and feed point position. From these parameters optimized, a four N-shaped slot antenna is fabricated and measured. The measured results of the antenna are obtained as follows results. The resonant frequency of the fabrication N-shaped slot antenna is 5.25GHz bandwidth for approximately 300MHz(VSWR<2.0) and the gain is $1.3{\sim}2.64dBi$. The experimental far-field patterns are stable across the pass band. The 3dB bandwidth in H-Plane and E-Plane are $80.21^{\circ}\;and\;103.38^{\circ}$, respectively.

Characteristics of a Microstrip Circularly-Polarized Aperture-Patch $8\times8$ Array Antenna (마이크로스트립 원형 편파 개구면-패치 $8\times8$ 배열 안테나의 특성)

  • 김인광;박위상
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.10 no.7
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    • pp.1022-1032
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    • 1999
  • The radiation characteristics of a microstrip circularly-polarized aperture-patch $8\times8$ array antenna are investigated at X-band. The radiator consists of a truncated square aperture on the ground plane with an inclined rectangular patch inside, and it is coupled by a microstrip line on the opposite side of the ground. The element spacing of the array was chosen as $0.8\lambda_0$so as to minimize the mutual coupling and maximize the gain. A corporate feed network was employed to distribute the power to each element through four Wilkinson and two T-junction dividers. Measurement results for the $8\times8$ array at 10 GHz showed a directivity of 26.3 dBi, a gain of 22.2 dBi, an axial ratio of 2.97 dB, and a side lobe level of -12.7dB. It was observed that when the array size increases, the directivity increases while the efficiency decreases.

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Design of the L-band Rotary Joint in Ring Contact Type to Improve Signal Insertion Loss (삽입손실 개선을 위한 링 접촉식 구조의 L대역 로터리조인트 설계)

  • Na, Jae-Hyun;Roh, Don-Suk;Kim, Dong-Gil
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.1
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    • pp.41-48
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    • 2019
  • This paper deals with the design of the L-band rotary joint, which is a core part of the tracking radar system. The rotary joint is a part that is mounted on the rotating parts of the tracking system antenna, which smoothly transmits RF signals with minimizing signal insertion loss. To improve the insertion loss of rotary joint, 1) dielectric materials, 2) design of distribution ring and 3)dielectric shape are studied. The performance of proposed rotary joint is compared with the conventional product. The prototype rotary joint showed a max insertion loss of 0.68dB, that is improved about 46% compare with conventional product which insertion loss was 1.26dB.

Design and SAR Analysis of Broadband Monopole Antenna Using Loop and T-Shaped Patches (사각 루프와 T자형 패치를 결합한 광대역 평면형 모노폴 안테나 설계 및 SAR 분석)

  • Jang, Ju-Dong;Lee, Seungwoo;Kim, Nam;Choi, Dong-Geun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.1
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    • pp.1-10
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    • 2013
  • In this paper, a broadband planar monopole antenna for multi-band services is proposed. The physical size of the proposed antenna is miniaturized by folding a rectangular loop. And a resonance point in the 3.9 GHz band is reduced by a coupling phenomenon with the central part of the T-shaped patch and the folded rectangular loop. In addition, the T-shaped patch is inserted to the rectangular shaped monopole antenna due to deriving the broadband frequency characteristics. The frequency characteristic is optimized by adjusting the gap and length of the folded rectangular loops and a transverse diameter of the T-shaped patch. The antenna dimensions including the ground plane are $40{\times}60{\times}1.6mm^3$. It is fabricated on the FR-4 substrate(${\epsilon}_r$=4.4) using a microstrip line of $50{\Omega}$ for impedance matching. In the measured result, the bandwidth corresponding to the VSWR of 2:1 is 162 MHz(815~977 MHz) and 2,530 MHz(1.43~3.96 GHz). For analyzing the human effect by the proposed antenna, 1 g and 10 g averaged SARs are simulated and measured. As the simulated results, 1 g-averaged SAR is 1.044 W/kg, and 10 g-averaged SAR is 0.718 W/kg. This result are satisfied by the SAR guidelines which are 1.6 W/kg(1 g-averaged) and 2.0 W/kg(10 g-averaged).