• Title, Summary, Keyword: Metamaterial

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New Metamaterial Structure for High Gain Metamaterial Patch Antenna (고 이득 메타매터리얼 패치안테나를 위한 새로운 메타매터리얼 구조)

  • Lee, Nam-Ki;Yang, Seung-In
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.47 no.4
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    • pp.25-30
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    • 2010
  • Our new metamaterial structure patch antenna improves the gain of ordinary metamaterial patch antenna. The structure of new metamaterial cover is made by removing central $7{\times}7$ lattices out of $9{\times}9$ lattices. Also, the metamaterial covers can be easily fabricated using ordinary substrates. Measurement results of a patch antenna, a metamaterial patch antenna and our proposed metamaterial patch antenna show that the gain of the proposed metamaterial patch antenna is about 3dB higher than that of the ordinary metamaterial patch antenna.

Design and analysis of a new composite double negative metamaterial for multi-band communication

  • Hossain, Mohammad Jakir;Faruque, Mohammad Rashed Iqbal;Islam, Mohammad Tariqul
    • Current Applied Physics
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    • v.17 no.7
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    • pp.931-939
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    • 2017
  • In this paper, a double C-shaped structure of double negative composite metamaterial is designed and depicts in configurations that can capable in a multi-band microwave frequency band. The design has achieved relative negative permeability, relative negative permittivity and relative negative refractive index. Analysis and comparison were done by using four configurations of composite metamaterial such as horizontal $1{\times}1$ array and vertical $1{\times}1$ array structures and the horizontal $1{\times}1$ and vertical $1{\times}1$ unit-cell configurations. Multi-band operating frequencies namely, S-band, C-band and X-band have been achieved using all configurations. The proposed metamaterial size is $1.2cm{\times}1.2cm{\times}0.16cm$ which includes all geometrical parameters to fit the design inside the substrate area. Computer Simulation Technology (CST) is adopted to investigate this design where an incident electromagnetic wave travelling along the positive z-axis with an E-field polarized along the y-axis. The results of the proposed metamaterial depict multi-band metamaterial response over the frequency span from 1 to 15 GHz. The effective medium ratio of the metamaterial unit-cell is 7.44. Moreover, the results clearly seen that the single-negative and double-negative metamaterial characteristics of the unit-cell and arrays over the multi-band. The dimensions and scattering parameters of the proposed double C-shaped metamaterial are suitable for the S -band, C-band and X-band applications.

A study of metamaterial transmission line characteristics using CPW structure (CPW 구조를 이용한 metamaterial 전송선로 특성에 관한 연구)

  • Kim, Jin-Su;Hwang, Hee-Yong
    • Journal of Industrial Technology
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    • v.28 no.B
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    • pp.251-255
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    • 2008
  • Metamaterial are artificial structures that can be designed to exhibit specific electromagnetic properties not commonly found in nature. Metamaterial transmission lines are usually fabricated with a microstrip structure and it's equivalent circuit is composed of two series capacitances and a shunt inductance. However microstrip structure need a via hall for realizing a shunt inductance. To eliminate via hall, we proposed a CRLH transmission line using a CPW structure, and obtained equivalent circuit values, line parameters.

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X-band Low Phase Noise Push-Push Oscillator Using Metamaterial Resonator (Metamaterial 공진기를 이용한 레이더 송. 수신기용 X-대역 고출력. 저위상 잡음 Push-Push 발진기)

  • Kim, Yang-Hyun;Seo, Chul-Hun;Ha, Sung-Jae;Lee, Bok-Hyung
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.46 no.12
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    • pp.1-5
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    • 2009
  • In this paper, low phase noise push-push oscillator (OSC) using the metamaterial resonator for missile defense systems and satellite communication was design and implemented. The metamaterial resonator has the large coupling coefficient value, which makes a high Q value, and has reduced phase noise of OSC. The OSC with 1.8 V power supply has phase noise of -117 dBc/Hz @100 kHz in the 12 GHz. When it has been compared with metamaterial resonator and coventional spiral resonator, the reduced Q value has been -29.7 dB and -47.6 dB respectively. This low phase noise OSC using metamaterial resonator could be available to a OSC in X-band.

Metamaterial with Electromagnetic Transparency under Multiband Absorptions

  • Zhang, Xu;Qi, Limei
    • Journal of the Korean Physical Society
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    • v.70 no.4
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    • pp.401-405
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    • 2017
  • We propose a metal-dielectric-metal (MDM) metamaterial that has an electromagnetic (EM) transparency spectrum under multiband absorptions in the C and the X bands. The ground continuous metal film used in the conventional metamaterial absorber (MA) is replaced by a structured ground plane (SGP) in our design. The band-pass properties of the front patterned metal film and the SGP determine the EM transparency spectrum, while the magnetic and the electric resonances in the MDM structure contribute to the multiband absorptions. Due to the symmetric structure of the unit cell, the absorption bands and the EM transparency spectrum of the metamaterial have the property of polarization independency. Despite the normal incidence, the metamaterial can also be used for non-normal incidence.

Metamaterial Perfect Absorber Technology for Leading the Fourth Industrial Revolution (4차 산업혁명을 선도할 메타물질 완전흡수체 기술 동향)

  • Hong, S.H.;Kim, M.H.;Yun, H.W.
    • Electronics and Telecommunications Trends
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    • v.32 no.6
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    • pp.1-7
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    • 2017
  • A metamaterial is a material engineered to have a property that does not exist in nature. A designable material property can be achieved by tailoring its structure, and thus a metamaterial is a novel ICT material and component technology that can break through the limitations of conventional technologies. Among the metamaterials available, a perfect metamaterial absorber is a technology that can nearly absorb light, sound waves, thermal waves, and electromagnetic waves with a simple structure, and has been of significant interest in energy, display, sensor, stealth, and military applications, with wavelengths from visible light to microwaves. In this article, we introduce a brief description of metamaterial absorber technology, the critical issues for its application, as well as ETRI's developed metamaterial absorber technology and its prospects for future use.

High Gain Metamaterial Patch Antenna for 2.4GHz Band using New Metamaterial Single-Layer (새로운 메타물질 Single-Layer를 이용한 2.4GHz 대역을 위한 고 이득 메타물질 패치 안테나)

  • Park, Kwan-Young;Yang, Seung-In
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.6
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    • pp.56-61
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    • 2013
  • In this paper, a high gain patch antenna using a single layer metamaterial superstrate with a near-to-zero refractive index (n) is proposed. Simulations for an ordinary patch antenna and our proposed metamaterial patch antenna were conducted. Our proposed metamaterial patch antenna was implemented and measured. The gain of our proposed metamaterial patch antenna is 6.77dB higher than that of an ordinary patch antenna.

4 Way Quadrature Divider Using Metamaterial Transmission Lines (Metamaterial 전송선로를 이용한 4출력 90° 위상 분배기)

  • Cho, Hak-Rae;Kim, Jeong-pyo;Koo, Kyung-Heon
    • The Journal of Advanced Navigation Technology
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    • v.22 no.2
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    • pp.141-147
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    • 2018
  • We propose a wideband 4-way quadrature divider for global navigation satellite system (GNSS). The proposed divider consists of one balun and two 2-way quadrature dividers. In the balun, the input power is divided by a wilkinson divider and the out of phase characteristic is achieved by ${\pm}90^{\circ}$ metamaterial transmission line phase shifters applied two output ports. The structures of two quadrature dividers is similar to that of the balun, but the phase shifters of two output ports are exchanged by ${\pm}90^{\circ}$ metamaterial transmission line. Metamaterial transmission lines are designed by using five LC loaded transmission line (LCL-TL) unit cells. The fabricated 4 way quadrature divider has the phase characteristic of $90^{\circ}{\pm}10^{\circ}$ in 1.165 - 1.61 GHz.

Controllable electromagnetically-induced transparency-like response in a bilayer metamaterial

  • Hwang, J.S.;Yoo, Y.J.;Kim, Y.J.;Kim, K.W.;Rhee, J.Y.;Park, S.Y.;Lee, Y.P.
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.234.2-234.2
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    • 2015
  • Recently, the electromagnetically-induced transparency (EIT)-like effect in metamaterials has attracted enormous interest. Metamaterial analogs of EIT enable promising applications in slow-light devices, low-loss metamaterial, quantum optics, and novel sensors. In this work, we experimentally and numerically studied a bilayer metamaterial for controllable EIT-like spectral response at microwave frequencies. Bilayer metamaterial consists of two snake-shape resonators (SSRs) with one and two bars. The transmission spectra were measured in a frequency range of 4 - 8 GHz in an anechoic chamber at normal incidence. It is found that two SSRs in the metamaterial are activated in bright modes, and the coupling between two bright modes leads to the EIT-like effect, which results in the enhanced transmission at 5.61 GHz. Furthermore, we confirm that the EIT-like feature could be controlled by adjusting the geometric parameters of metamaterial structure. Our work provides a way to tunable EIT-like effect and various potential applications including filters, sensors, and other microwave devices.

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Common-Mode Suppression Balanced Filter based on Composite Right/Left-Handed Transmission Line (CRLH 전송선로를 이용한 공통 모드 억압 평형 필터)

  • Kim, Young;Yun, Jeong-Ho;Yoon, Young-Chul
    • The Journal of Advanced Navigation Technology
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    • v.15 no.4
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    • pp.571-577
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    • 2011
  • This paper presents a novel balanced filter design based on a metamaterial structure applicable to differential-mode excitation. The metamaterial structure is based on a unit-cell which under a differential-mode excitation behaves like composite right/left-handed(CRLH) metamaterial with filter characteristics. In contrast, the metamaterial unit-cell is below cut-off under a common-mode excitation. Experimental results are used to verify the proposed metamaterial's differential-mode characteristics. The metamaterial is fabricated with a balanced filter design resulting in an operating frequency range of 960~1000 MHz with a insertion loss of 4.1 dB.