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Textile antenna with EBG structure for body surface wave enhancement
Jinpil Tak,Youngtaek Hong,Jaehoon Choi IET 2015 Electronics letters Vol.51 No.15
<P>A textile antenna with an electric bandgap (EBG) structure for body surface wave enhancement is proposed. The proposed antenna is composed of a centre-fed circular patch to generate the TM<SUB>01</SUB> mode and an EBG structure near the patch to guide the TM wave along the horizontal surface (<I>θ</I> = 90°). Considering the wearability, the antenna has been fabricated using only textile materials such as conductive textiles, conductive thread, and a leather substrate, and has an enhanced radiated field along the surface direction in the 5.8 GHz industrial, scientific, and medical (ISM) band for on-body communication. The proposed antenna has a diameter of 1.98<I>λ</I><SUB>0</SUB> and a thickness of 0.058<I>λ</I><SUB>0</SUB> at 5.8 GHz.</P>
A Low-Profile Dipole Array Antenna with Monopole-Like Radiation for On-Body Communications
Jinpil Tak,Jaehoon Choi 한국전자파학회JEES 2015 Journal of Electromagnetic Engineering and Science Vol.15 No.4
In this paper, a low-profile dipole array antenna with monopole-like radiation for on-body communications is proposed. The proposed antenna, operating in the industrial, scientific, and medical (ISM) band, is designed with consideration of the human body effect. By placing eight planar dipole antenna elements symmetrically around the z-axis, the proposed antenna achieves monopole-like radiation characteristics with a low profile. The antenna has overall dimensions of 0.44 λ0 × 0.44 λ0 × 0.013 λ0 at 2.45 GHz in the ISM 2.45 GHz band (2.4?2.485 GHz) and a 10- dB return loss bandwidth of 4.9% ranging from 2.4 to 2.52 GHz.
Design of a Metamaterial Absorber for ISM Applications
Jinpil Tak,Youngki Lee,Jaehoon Choi 한국전자파학회JEES 2013 Journal of Electromagnetic Engineering and Science Vol.13 No.1
This paper proposes a metamaterial (MTM) absorber for 2.45 GHz band applications. The unit cell of the proposed absorber consists of an electric LC (ELC) resonator and a strip line, which are printed on opposite sides of the substrate. The ELC resonator comprises two split ring resonators (SRRs) and a connecting line with a resistor. The designed absorber exhibits an absorption of 94 % and a half-max bandwidth of 0.16 GHz at 2.45 GHz.
Dual-Band Dual-Mode Patch Antenna for On-/Off-Body WBAN Communications
Jinpil Tak,Seungmin Woo,Jaekwang Kwon,Jaehoon Choi IEEE 2016 IEEE antennas and wireless propagation letters Vol.15 No.-
<P>A novel coplanar waveguide (CPW)-fed dual-band dual-mode patch antenna for on-/off-body communications is proposed. The proposed antenna, which comprises a T-shaped patch with parasitic patches, a circular patch, and a CPW feedline, has dimensions of mm The proposed antenna operates in the 2.4-GHz ISM band (2.4-2.485 GHz) for off-body communication, and in the 5.8-GHz ISM band (5.725-5.875 GHz) for on-body communication. The antenna has a patch-like radiation pattern in the 2.4-GHz ISM band and a monopole-like radiation pattern in the 5.8-GHz ISM band.</P>
Tak, Jinpil,Kang, Do-Gu,Choi, Jaehoon Hindawi Limited 2015 International journal of antennas and propagation Vol.2015 No.-
<P>A stepped cylindrical antenna with a higher-order mode ring patch for wideband conical radiation pattern is proposed. To accomplish a low profile with wideband conical radiation characteristics, a stepped cylindrical monopole and a TM41higher-order mode ring patch with four shorting pins are utilized. The proposed antenna has a monopole-like radiation pattern with a wide 10-dB return loss bandwidth of 11 GHz (2 GHz-13 GHz). It can cover various wireless services, such as wireless broadband (WiBro; 2.3 GHz-2.39 GHz), wireless local area networks (WLAN; 2.4 GHz-2.484 GHz, 5.15 GHz-5.35 GHz, and 5.725 GHz-5.875 GHz), digital multimedia broadcasting (DMB; 2.63 GHz-2.655 GHz), and ultra wideband (UWB; 3.1 GHz-10.6 GHz). The antenna has a height of only 0.12<I>λ</I>0at 2 GHz.</P>
인체 표면 통신을 위한 TM31 고차 모드 반원-링 인체 부착형 마이크로스트립 패치 안테나 설계
탁진필(Jinpil Tak),전재성(Jaesung Jeon),김선우(Sunwoo Kim),최재훈(Jaehoon Choi) 한국전자파학회 2014 한국전자파학회논문지 Vol.25 No.5
본 논문에서는 모노폴과 같은 방사특성을 갖고 인체 표면 간 통신을 위한 TM31 고차 모드 반원-링 마이크로스트립 패치 안테나를 제안하였다. 제안된 안테나는 단락 핀을 이용하여 TM31 고차 공진 모드를 형성하였고, 평면형임에도 불구하고 모노폴과 같은 방사특성을 갖는다. 패치안테나의 좁은 대역폭을 확장하기 위해 TM31 모드 C-형 반링 패치를 반원 패치에 인접시켰으며, 소형화를 위해 half mode를 사용하였다. 인체 착용환경을 고려하여 마이크로스트립 라인을 이용하여 급전하였다. 제안된 안테나는 ISM(Industrial, Scientific, and Medical) 2.45 GHz 대역(2.4~2.485 GHz)에서 0.25 λ0×0.46 λ0×0.025 λ0의 크기를 갖고, 2.38~2.49 GHz에서 4.24 %의 10-dB 반사손실 대역폭을 갖는다. 인체의 영향을 고려하기 위해 2/3 근육-등가 반고체형 모의인체를 제작하고, 이를 이용하여 안테나에 미치는 인체의 영향을 분석, 검증하였다. 또한, 실제 인체 상황에서 제안된 안테나를 통해 인체 표면 간 링크의 통신 성능 분석을 위한 실험을 수행하였다. In this paper, a TM31 higher order mode half circular-ring microstrip antenna with monopole-like radiation characteristic for on-body communication is proposed. By using shorting vias, TM31 resonance mode was excited, while achieving compact low-profile antenna with monopole-like radiation characteristics. To overcome the narrow bandwidth of a patch antenna, a C-shape half ring patch with shorting vias having TM31 mode is closely located around a half circular patch. For size reduction, half mode is adopted. The proposed antenna has the overall dimensions of 0.25 λ0×0.46 λ0×0.025 λ0 at the industrial, scientific, and medical(ISM) 2.45 GHz band(2.4~2.485 GHz) and the 10-dB return loss is 4.24 % ranging from 2.38 to 2.49 GHz. To verify body effect, two-thirds muscle equivalent semi solid phantom was fabricated and used to measure the antenna performance. A communication link is analysed to investigate the effect of human-body movements and antenna locations.
탁진필(Jinpil Tak),최재훈(Jaehoon Choi) 한국전자파학회 2014 한국전자파학회논문지 Vol.25 No.11
WBAN은 다양한 응용 가능성 때문에 최근 들어 많은 관심을 받고 있다. 본 논문에서는 기기의 위치에 따른 WBAN 통신환경에 적합한 몇 가지 안테나와 모의 인체 제작에 대하여 소개하고자 한다. WBAN 시스템은 인체 내부 및 인체 표면에서 동작하므로 고유전율 및 고도전율을 갖는 인체 매질에 대한 영향을 고려해야 하며, 특히 안테나는 근역장 매질 특성에 따라 안테나의 방사 특성 및 반사 손실 특성이 변하게 되므로, 이를 고려한 안테나 설계가 요구된다. 또한, 안테나의 인체 영향을 고려하기 위해 모의 인체를 이용해 안테나를 설계하고 측정하였다. 서론에서는 WBAN 통신 채널의 분류를 소개하고, 각각의 통신 채널에 적합한 안테나의 특성에 대해 간단히 언급하였다. 제안된 몇 가지 안테나 사례 및 모의 인체 구현에 대하여 논의하였다. 결론에서는 안테나 설계 시 고려해야 할 사항과 향후 연구에 대해 언급하였다. WBAN has received great attention recently due to its versatile applicability. In this paper, antennas suitable for WBAN communication depending on the locations of mobile devices and the manufacturing of a human equivalent phantom are introduced. The effect of the body on the communication performance is largely dependent on the locations of devices. Specifically, the radiation and return loss characteristics of the antenna are greatly influenced by the characteristics of a medium existing in the near-field of an antenna. Thus, the proper WBAN antenna design is important in establishing a successful communication link between the transceivers. To consider the effect of the body on the antenna performance, the human equivalent phantom is also important factor in the WBAN antenna design and measurement. In introduction, categorization of the WBAN communication channel is introduced and antenna characteristics required for each communication channel are described. In the main subject section, several WBAN antenna design examples along with the implementation of the human equivalent phantom are discussed. In conclusion, the factors, which have to be considered in the design process, and future research are mentioned.