• Title/Summary/Keyword: Microstrip Antennas

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Design and Implementation of a Stacked Microstrip Antenna with Broad Bandwidth for ISM Band (ISM 대역에서의 적층 구조를 이용한 광대역 마이크로스트립 안테나 설계 및 제작)

  • Kim, Min-Joon;Lee, Jong-Woo
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.437-441
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    • 2003
  • The major drawback of the classical microstrip patch antennas Is their narrow band characteristic from 1% to 5%. In this paper, to improve this drawback, we designed the antenna with stacked structure having one drive patch connected with feed line and four identical radiation patches. Resonance is achieved by adjust ing coupling area between one drive patch and four identical radiation patches and changing the size of drive patch or radial ion patches. Used substrate is FR4(${\epsilon}_r$=4.6 and t=1.6mm) and designed center frequency is 2.45GHz. The designed antenna has a wide bandwidth of 380Mhz form 2.333GHz to 2.713GHz(about 15.5%) including ISM band from 2.4GHz to 2.4835GHz.

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Slotted Implantable Patch Antenna for ISM Band Application and Its Usage in WiMAX with an I-Shaped Defected Ground Structure

  • Ayubi, Adil Al;Sukhija, Shikha;Sarin, Rakesh Kumar
    • Transactions on Electrical and Electronic Materials
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    • v.18 no.6
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    • pp.359-363
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    • 2017
  • A slotted implantable patch antenna with microstrip feeding is proposed for industrial, scientific, and medical band applications. The result is verified by implanting the antenna in animal tissue. Further, by varying the ground width and introducing a defect into the ground structure, the antenna becomes applicable for worldwide interoperability for microwave access operations. A simulation is performed using Empire XCcel software. An Agilent vector network analyzer is used for analyzing the return loss performance. Simulated and measured results are compared. Antennas with and without defected ground structure both have key advantages including low profile, desirable return loss, good impedance matching and required bandwidth.

Multi Folded Dual rectangle loop Type Dual Monopole Antenna (다중 폴드 이중 사각루프형태의 이중 모노폴 안테나)

  • Lee, Hyeon-Jin;Choi, Tea-Il
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.61 no.1
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    • pp.5-9
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    • 2012
  • In this paper, multi folded dual monopole antenna for WLAN communication of dual bend is designed and fabricated. The proposed multi folded dual monopole antenna are consisted of two folded rectangle loops by microstrip fed that is modified dual monopole antenna. Therefore, the outside rectangle loop structure of the proposed antenna is extended a dual monopole. The characteristics of the proposed antenna is analyzed return loss and radiation patterns by the FDTD tools. As a result a bandwidth of proposed antenna has about 0.82GHz from 2.0 to 2.82[GHz] and 0.7GHz from 5.46 to 6.16[GHz]. It is used WLAN communications of 2[GHz] and 5[GHz].

A dual-frequency and dual-polarization antenna with enhanced isolation between two ports using shorted metallic patches (Shorted metallic patch 를 이용하여 두 포트 사이의 고립도를 향상 시킨 이중대역 이중편파 안테나)

  • Lee, Dong-Hyun;Kim, Jae-Hee;Jang, Jong-Hun;Im, Yun-Taek;Park, Wee-Sang
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.67-68
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    • 2006
  • A suspended microstrip line structure over mushroom-like SMPs is designed and is applied to a dual-frequency and dual-polarization microstrip patch antenna. This structure has a distinctive and sharp rejection band and provides near 0 dB insertion loss outside the rejection band. Applying the structure to the conventional DFDP antenna enhanced the isolation between the two ports more than 20 dB. The structure is expected to have a wide range of applications in antennas and filters due to its compactness and integrability in circuits.

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An Improvement of Closed-Form Formula for Mutual Impedance Computation

  • Son, Trinh-Van;Hwang, Keum Cheol;Park, Joon-Young;Kim, Seon-Joo;Shin, Jae-Ho
    • Journal of electromagnetic engineering and science
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    • v.13 no.4
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    • pp.240-244
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    • 2013
  • In this paper, we present an improvement of a closed-form formula for mutual impedance computation. Depending on the center-to-center spacing between two rectangular microstrip patch antennas, the mutual impedance formula is separated into two parts. The formula based on synthetic asymptote and variable separation is utilized for spacings of more than 0.5 ${\lambda}_0$. When the spacing is less than 0.5 ${\lambda}_0$, an approximate formula is proposed to improve the computation for closely spaced elements. Simulation results are compared to computational results of mutual impedances and mutual coupling coefficients as functions of normalized center-to-center spacing in both E- and H-plane coupling configurations. A good agreement between simulation and computation is achieved.

The Characteristics of Koch Island Microstrip Patch Antenna

  • Kim, Il-Kwon;Yook, Jong-Gwan;Park, Han-Kyu
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.3A
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    • pp.166-170
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    • 2003
  • In this paper, the characteristics of Koch island microstrip patch antenna are investigated by numerical and experimental methods. The Koch patch is fractal shaped antenna which can be characterized by two properties such as space-filling and self-similarity. Due to its space-filling property of fractal structure, the proposed Koch fractal patch antennas are smaller in size than that of conventional square patch antenna. From numerical and experimental results, it is found that as the iteration number and iteration factor of Koch patch increase, its resonance frequency becomes lower than that of conventional patch, thus contributes to antenna size reduction. In particular, when the fractal iteration factor is 1/4, the fractal antenna is 45% smaller in size than that of conventional patch, while maintaining radiation patterns comparable to those of rectangular antenna and cross polarization level is about -20~-14 dB.

The Design of $4{\times}4$ Microstrip Patch Array Antenna of K-Band for the High Directivity (고지향성 구현을 위한 K-밴드 $4{\times}4$ 마이크로스트립 패치 어레이 안테나의 설계)

  • Lee, Ha-Young;Braunstein, Jeffrey;Kim, Hyeong-Seok
    • Proceedings of the KIEE Conference
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    • 2006.07c
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    • pp.1613-1614
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    • 2006
  • In this paper, a $4{\times}4$ rectangular patch array antenna operated at 20 GHz is implemented for the satellite communication. Two $2{\times}2$ subarrays are designed and more efficient $2{\times}2$ subarray is used for the design of $4{\times}4$ patch array. The sixteen patch antennas and microstrip feeding line are printed on the single-layered substrate. The spacing between the array elements is chosen to be $0.736{\lambda}$. HPBW (Half-Power Beam Width) is 17.6 degrees in the E-plane and 18.7 degrees in the H-plane with a gain of 17.2SdBi in the simulation results.

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Wideband 4×8 Array Antennas with Aperture Coupled Patch Antenna Elements on LTCC

  • Jun, Dong-Suk;Bondarik, Alexander;Lee, Hong-Yeol;Ryu, Han-Cheol;Paek, Mun-Cheol;Kang, Kwang-Yong;Choi, Ik-Guen
    • Journal of electromagnetic engineering and science
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    • v.10 no.3
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    • pp.150-157
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    • 2010
  • We proposed a $4{\times}8$ array antenna with aperture-coupled patch antenna elements. The antenna was designed for 60 GHz operation and fabrication on the low-temperature cofired ceramic(LTCC) substrate($\varepsilon_r$=5.8). The feedline with the stub was designed to enhance the radiating element bandwidth and the transition characteristics between the waveguide (WG) and microstrip line(MSL). Through the optimization of the antenna and feedline geometry, the antenna gain and the performance of the 10 dB bandwidth were 20.2 dBi and 13 % up, respectively. The measured results agreed with the simulated ones.

Synthesis of Filtering Structures for Microstrip Active Antennas Using Orlov's Formula

  • Urbani, Fabio;Bilotti, Filiberto;Vegni, Lucio
    • ETRI Journal
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    • v.27 no.2
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    • pp.166-171
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    • 2005
  • In this paper, a synthesis technique for nonuniform filtering structures to be employed in active integrated antenna layouts is presented. The idea is to suppress the higher harmonic contribution due to the presence of nonlinear components through a nonuniform transmission line properly designed via Orlov's synthesis formula. The theory presented is applied here to synthesize an amplifier-based active antenna layout for wireless local area network (WLAN) purposes working at 2.4 GHz. The numerical results presented show the capabilities of the proposed approach.

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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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