• Title/Summary/Keyword: Metamaterial

Search Result 231, Processing Time 0.019 seconds

Analysis of stealth design for naval vessels with wide band metamaterials (함정의 스텔스 설계를 위한 광대역 메타물질 적용 연구)

  • Hwang, Joon-Tae;Hong, Suk-Yoon;Kwon, Hyun-Wung;Song, Jee-Hun
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.21 no.11
    • /
    • pp.2206-2212
    • /
    • 2017
  • When it comes to naval surface warfare, the probability of detection is an important factor in survivability and the Radar Cross Section(RCS) is a major parameter. In this paper, the RCS reduction technology of the Radar Absorbing Material(RAM) method is carried out for the general frequency range for naval warfare. We set the analysis model with the simplified ship model and the wide band metamaterial which is high-tech radar absorbing materials is selected for the RAM method. The modeling of the wide band metamaterial composed of an MIK surface which has the wide band resonant properties and flexible substance and the electromagnetic absorptions and reflections of the wide band metamaterial has been simulated to explore the performance. Also, the wide band metamaterial is compared with the paint absorber to analyze RCS reduction in terms of RCS values.

Design of Ku-band Low Phase Noise Oscillator Using DSRR Structure Resonator based on Metamaterial (메타구조 기반의 DSRR 구조 공진기를 이용한 Ku 대역 저 위상잡음 발진기)

  • Yoon, Nanae;Seo, Chulhun
    • Journal of the Institute of Electronics and Information Engineers
    • /
    • v.51 no.2
    • /
    • pp.19-22
    • /
    • 2014
  • In this paper, Ku-band low phase noise oscillator using DSRR structure resonator based on metamaterial was proposed. To improve the phase noise of the oscillator, the proposed resonator consist of a DSRR strcuture based on metamaterial. The proposed resonator have a characteristic of $S_{11}$ is -0.25 dB, and $S_{21}$ in -44.59 dB at 14.67 GHz, respectively. At 14.67 GHz, the proposed Ku-band low phased oscillator achieves a output power of 2.03 dBm, $2^{nd}$ harmonic of -36.04 dBc, and phase noise of -130.63 dBc at the 100 kHz offset, respectively.

Design of a Novel 2D-Metamaterial CRLH ZOR Antenna with a Microstrip Patch Capacitively Coupled to a Rectangular Ring (직각 링과 용량성 결합된 마이크로스트립 패치 구조의 새로운 2차원 메타 재질 구조 CRLH 0차 공진 안테나의 설계)

  • Jang, Geon-Ho;Kahng, Sung-Tek
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.21 no.2
    • /
    • pp.143-151
    • /
    • 2010
  • In this paper, a novel rectangular patch antenna is proposed to have Zeroth Order Resonance(ZOR) generated based on the Metamaterial Complosite Right- and Left-Handed(CRLH) structure. Making the in-phase electric field over the entire antenna other than a half-wavelength as the fundamental resonance mode of a standard microstrip patch or its positive multiple, the metallic patch is suggested to be capacitively coupled with only one surrounding rectangular ring, different from the previous 1D ZOR antennas commonly having several metal cells in line. The performance of the proposed antenna is simulated by a 3D field solver that inputs the sizes of the physical structure corresponding to the equivalent circuit designed to have ZOR at 2.4 GHz. Consequently, the resonance frequency, the gain and the antenna efficiency are observed 2.4 GHz, 5 dB and 98%, respectively. Besides, the important property of the proposed antenna is addressed as the combination of the low profile as an advantage of microstrip patch antennas, and the omni-directional field pattern typical of monopole antennas.

Ethanol Concentration Sensor Using Microfluidic Metamaterial Absorber (에탄올의 농도를 검출하기 위한 미세유체 메타물질 흡수체)

  • Kim, Hyung Ki;Yoo, Minyeong;Lim, Sungjoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.26 no.5
    • /
    • pp.506-513
    • /
    • 2015
  • In this paper, we proposed a novel ethanol concentration sensor using microfluidic metamaterial absorber. The metamaterial absorber comprises a split-ring-cross resonator(SRCR) and a microfluidic channel. The SRCR can generate LC resonance that is very sensitive to changes in the effective dielectric constant around the capacitive gap. In addition, microfluidic channels can change the effective dielectric constant of the dielectric substrate by using an infinitesimal quantity of a liquid on the order of microliters. The proposed absorber can detect the electrical properties of different concentration of ethanol. The performance of the proposed absorber is demonstrated using the absorption measurements of a fabricated prototype sample with waveguides. In addition, the simulated results and measurement results show good agreement.

Analysis of the Cylindrical Metamaterial Slab Using the Higher Order-mode Finite Difference Time Domain Method (고차모드 시간영역 유한차분법을 이용한 원통형 메타물질 Slab의 해석)

  • Hong, Ic-Pyo
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.14 no.1
    • /
    • pp.38-44
    • /
    • 2010
  • In this paper, the higher order FDTD(Finite-Difference Time-Domain) method is used to obtain the frequency response characteristics of the cylindrical metamaterial slab. FDTD method is one of strongest electromagnetic numerical method which is widely used to analyze the metamaterial structure because of its simplicity and the dispersive FDTD equation which has the dispersive effective dielectric constant and permeability are derived to analyze the metamaterials. This derived dispersive FDTD equation has no errors in analyzing the dielectric materials but there are some time and frequency errors in case of analyzing the metamaterials. We used the higher order FDTD method to obtain the accurate frequency response of the metamaterials. Comparisons between the dispersive FDTD method and the higher order FDTD method are performed in this paper also. From the results, we concluded that more accurate frequency response for various metamaterials applications can be obtained using the proposed method in this paper.

A Small Composite Right/Left-Handed Transmission Line Metamaterial Antenna Using a Magneto-Dielectric Material (Magneto-Dielectric Material을 이용한 소형 Composite Right/Left-Handed Transmission Line Metamaterial 안테나)

  • Jang, Kyung-Duk;Kim, Jae-Hee;Kim, Gi-Ho;Seong, Won-Mo;Park, Wee-Sang
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.19 no.2
    • /
    • pp.223-230
    • /
    • 2008
  • A CRLH-TL based compact metamaterial antenna on a magneto-dielectric material is proposed. The proposed antenna is composed of two patches and vias, which is loaded by a magneto-dielectric material constructed by SRRs. The characteristic of SRRs is studied, and the size reduction of the antenna by using the magneto-dielectric material is confirmed. The simulated resonant frequency of the antenna has showed a decrease of 7.13 % at - 1st-order resonant mode, and 23.9 % at zeroth-order resonant mode. A zeroth-order resonant antenna is fabricated and measured, which has a resonant frequency of 1.888 GHz, a bandwidth of 0.48 %, a gain of 0.534 dBi, and an efficiency of 51.7 %.

Design and Analysis of 3D Isotropic Metamaterial Bulk Structure Using Thin Wire and SRR (Thin Wire와 SRR을 이용한 3D 등방성 Metamaterial Bulk 구조 설계 및 분석)

  • Kim, Chung-Ju;Lee, Bom-Son
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.22 no.9
    • /
    • pp.919-925
    • /
    • 2011
  • In this paper, we designed and analyzed a 3D isotropic bulk structure consisting of thin wires and SRR's(Split Ring Resonator) with which the permittivity and permeability can be controlled at the same time. For the 3D isotropic bulk structure, first of all, the geometry seen by three main axes must look alike. Thus, we adopted the orthogonal thin wires and symmetrical SRR's. As a result, we constructed metamaterial bulk structures of which effective relative permittivity and permiability are about -0.6 and -1.5, respectively. Its refractive index is about -0.95 in each direction(x, y and z direction). The computed Brillouin dispersion diagram also showed that the proposed structure is almost near isotropic.

Design of Ultra Wide Bandpass Filter by Metamaterial for KSTAR Reflectometry (KSTAR (Korea Superconducting Tokamak Advanced Research)용 Reflectometry를 위한 메타전자파 구조 광대역 대역 통과 여파기 설계)

  • Lee, Chong-Min;Sim, Woo-Seok;Seo, Chul-Hun
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.49 no.1
    • /
    • pp.73-77
    • /
    • 2012
  • In this article, we designed a wide bandpass filter in order to apply microwave reflectometry for KSTAR. The proposed wide bandpass filter consists of a metamaterial structure which is to get a wide band, a lower insertion loss, and a high skirt. This is applied to VCO's output to enhance the linearity. A pass band is 18-28 GHz and the out of pass band is stopped over 20 dB. To confirm of the metamaterial, we suggest a dispersion diagram. The proposed filter in lower band and upper band of pass band is respectively a left handed and right handed characteristics. A group delay is below 0.5 ns.

K-Band Low Phase Noise Push Push OSC Using Metamaterial Resonator (Metamatrial Resonator를 이용한 K-Band 저위상 잡음 Push Push OSC 설계)

  • Shim, Woo-Seok;Lee, Jong-Min;Seo, Chul-Hun
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.49 no.2
    • /
    • pp.67-71
    • /
    • 2012
  • In this paper, a push-push oscillator at K-band with a double H-shape metamaterial resonator (DHMR) based on high-Q is proposed with metamaterial structure to improve the phase noise and output power. The proposed oscillator shows low phase noise and high output power. DHMR is designed to be high-Q at resonance frequency through strong coupling of E-field. oscillators which are combined in push-push structure improve output power. The propose push-push oscillator shows the output power of 3.1 dBm, the fundamental signal suppression of -23.7 dBc and phase noise of -116.28 dBc at 100 kHz offset frequency and 20.20 GHz center frequency.

Flexible Microfluidic Metamaterial Absorber for Remote Chemical Sensor Application (원격 화학 센서로 활용 가능한 플렉서블 미세유체 메타물질 흡수체)

  • Kim, Hyung Ki;Lim, Sungjoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.27 no.2
    • /
    • pp.123-130
    • /
    • 2016
  • In this paper, a novel flexible microfluidic metamaterial absorber is proposed for remote chemical sensor applications. The proposed metamaterial absorber consists of a periodic of split-ring-cross resonators(SRCRs) and a microfluidic channel. The SRCR patterns are inkjet-printed using silver nanoparticle inks on paper. The microfluidic channels are laser-etched on polydimethylsiloxane(PDMS) material. The proposed absorber can detect change of the effective permittivity at different liquids. Therefore, the absorber can be used for a remote chemical sensor by detecting change of the resonant frequencies. The performance of the proposed absorber is demonstrated with full-wave simulation and measurement results. The experimental results shows that the resonant frequency is 10.49 GHz at the empty channel. When ethanol and DI-water are injected into the channel, the resonant frequencies are 10.04 GHz and 8.9 GHz, respectively.