• Title/Summary/Keyword: Patch size

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A Small Size Broadband MEMS Antenna for 5 GHz WLAN Applications (5GHz 무선랜 응용을 위한 소형 광대역 MEMS 안테나)

  • Kim, Ji-Hyuk;Kim, Hyeon-Cheol;Chun, Kuk-Jin
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.603-604
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    • 2006
  • A small size broadband microstrip patch antenna with small ground plane has been fabricated using MEMS. Multiple layer of high and low dielectric substrates are used to realize small size and broadband characteristics. The microstrip patch is divided into 4 pieces and each patch is connected to each other using a metal microstrip line. The fabrication process is very simple and only one mask is needed. Two types of microtrip antennas are fabricated. Type A is the microstrip antenna with metal lines and type B is the microstrip antenna without metal lines. The size of proposed microstip antenna is $8*12*2mm^3$ and the experimental results show that the antenna type A and type B have the bandwidth of 420MHz at 5.3 GHz and 480MHz at 5.66 GHz, respectively.

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Design of Compact Circularly Polarized Microstrip Patch Antenna with T-slits Loading (T-슬릿 부설에 의한 소형 원편파 마이크로스트립 패치 안테나 설계)

  • 김영두;신경섭;원충호;이홍민
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.41 no.10
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    • pp.103-108
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    • 2004
  • In this paper, a compact patch antenna with four T-slits fed by crossed aperture coupling is proposed for miniaturized Portable GPS handsets. The mechanism for compact size antenna is investigated with the behavior of the currents on the radiating patch. The equivalent surface current path due to the slits is lengthened, reducing the resonant frequency at a fixed patch size. The results of embedded T-slits for compact antenna size show that the resonant frequency is significantly lowered from 2.545GHz to 1.575GHz, corresponding to a 44.65% antenna size reduction compared to reference design. Experimental results show that good CP radiation patterns are obtained and impedance bandwidth (VSWR $\leq$ 2), 3dB axial ratio are about 21MHz, 19MHz at the center resonant frequency, respectively.

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.

Aperture-Coupled Microstrip Antenna with Four Slits and T-Slits for Compact Circular Polarization Operation (슬릿이 부설된 소형 원편파 개구결합 마이크로 스트립 안테나)

  • 김영두;김호용;이홍민
    • Proceedings of the IEEK Conference
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    • 2003.11c
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    • pp.327-330
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    • 2003
  • A novel compact circular polarization operation of the microstrip antenna with four-slits and T-slits is proposed. The mechanism for compact size antenna is investigated with the behavior of the currents on the radiating patch. The equivalent surface current path due to the slits is lengthened, reducing the resonant frequency at a fixed patch size. The proposed compact CP design can have an antenna size reduction of about 33 ∼ 45% as compared to the conventional microstrip antenna. Details of the experimental and measured results are presented and analysed.

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Study on the Single Feed Antenna for 2.64 GHz (2.64 GHz 단일 급전 안테나의 연구)

  • Park, Yong Wook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.2
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    • pp.811-815
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    • 2013
  • In this paper, we proposed and fabricated the single feed microstrip patch antenna with slot for S-DMB(Satellite-Digital Multimedia Broadcasting). In order to improve of frequency properties, patch size, feed length, and slot size were investigated by HFSS simulation program. The manufactured single feed microstrip patch antenna with slot showed that the measured center frequency, the minimum return loss and -10dB bandwidth were 2.64GHz, -34.67dB and 180MHz, respectively.

Radiation Characteristics of a Probe-Fed Microstrip Patch Antenna on a Finite Grounded High Permittivity Substrate

  • Kwak, Eun-Hyuk;Yoon, Young-Min;Kim, Boo-Gyoun
    • Journal of Electrical Engineering and Technology
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    • v.10 no.4
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    • pp.1738-1745
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    • 2015
  • Radiation characteristics of a probe-fed rectangular microstrip patch antenna printed on a finite grounded high permittivity substrate are investigated systematically for various square grounded dielectric substrate sizes with several thicknesses and dielectric constants by experiment and full wave simulation. The effect of the substrate size on the radiation characteristics of a rectangular patch antenna is mainly determined by the effective dielectric constant of surface waves on a grounded dielectric substrate. As the effective dielectric constant of surface waves increases, the substrate sizes for the maximum broadside gain and the required onset for a large magnitude of squint angle decrease, while the variations of the broadside gain, the front-to-back ratio, and the magnitude of squint angle versus the substrate size increase due to the increase of the power of the surface wave.

The Design of Broadband Patch Antenna with Microstrip Line-Probe Feeder (마이크로스트립 라인-프로브 급전구조를 갖는 광대역 패치 안테나의 설계)

  • 박종열;이윤경;윤현보
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.7
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    • pp.687-692
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    • 2002
  • The design of broadband patch antenna with the new feeder structure is proposed in this paper. The antenna operates in the center frequency 5.8 GHz. Proposed the new feeder structure has also broadband characteristic and reduced antenna size. To confirm broadband characteristic, compared with probe feeder antenna. After designing and manufacturing, the antenna bandwidth enhanced by 34.5 % and the patch size reduced by 45 %.

Elastic-plastic analysis of the J integral for repaired cracks in plates

  • Salem, Mokadem;Bouiadjra, Belabbes Bachir;Mechab, Belaid;Kaddouri, Khacem
    • Advances in materials Research
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    • v.4 no.2
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    • pp.87-96
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    • 2015
  • In this paper, three-dimensional finite element method is used to analyze the J integral for repaired cracks in plates with bonded composite patch and stiffeners. For elastic the effect of cracks, the thickness of the patch ($e_r$) and properties of the patch are presented for calculating the J integral. For elastic-plastic a several calculations have been realized to extract the plasticized elements around the crack tip of repaired and un-repaired crack. The obtained results show that the presence of the composite patch and stiffener reduces considerably the size of the plastic zone ahead of the crack. The effects of crack size and the inter-distance of repaired cracks were analysed.

A Study on Characteristics According to Variation of the Radiator Structure and the Feeder Branch angle of 1×6 Array Patch Antenna (1×6배열 패치 안테나의 복사기 구조와 급전선 브랜치 각도 변화에 따른 특성 연구)

  • Kang, Sang-Won;Chang, Tae-Soon;Choe, Gwang-Je
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.18 no.2
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    • pp.177-184
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    • 2018
  • In this paper, we analyze the characteristics of the antenna by changing the structure of the radiator and the angle of the branch of the array patch antenna. First, the structure of the radiator was changed from the rectangular patch to a hexagonal patch, a triangular patch. Secondly, we changed the angle of the feeder branch to $5^{\circ}$, $10^{\circ}$, $15^{\circ}$, $20^{\circ}$. When the branch angle is $10^{\circ}$, the measured 10dB frequency band is 23.38 GHz-24.19GHz and the bandwidth is 810MHz. The fabricated antenna has a gain of 9.65-10.06dBi at 24.05 GHz. The beam width of the main lobe is $12^{\circ}$, and the antenna size is $70{\times}36mm^2$. In addition to the rectangular patch, it is possible to maintain the performance by using patches of other shapes, and it is confirmed that by changing the feeder branch at various angles, it is possible to reduce the substrate size and contribute to diversity in the fabrication of the array antenna.

Stacked Square-Ring Microstrip Slot Antenna for Broadband Characteristics (광대역 특성을 위한 적층형 정사각형 링 마이크로스트립 슬롯 안테나)

  • 이선기;최준호;김영식
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2000.11a
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    • pp.319-323
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    • 2000
  • A method for miniaturization of microstrip patch antenna without degrading its radiation characteristics is investigated. The ring geometry introduces additional parameters to the antenna that can be used to control its resonance frequency and bandwidth. For a single square ring increasing the size of patch decreases the resonance frequency and bandwidth. To match the antenna to a transmission line and also enhance its bandwidth. the square ring patch is stacked by a square ring patch. The computed results are compared with experiment and good agreement is obtained.

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