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Lim, Inseop,Yun, Taehwa,Lim, Sungjoon IEEE 2014 IEEE antennas and wireless propagation letters Vol.13 No.-
<P>A novel low-profile reconfigurable antenna is proposed for changing radiation patterns. The antenna is constructed on a circular patch fed by a grounded coplanar waveguide (GCPW). The circular patch has three vertical shorting lines and one horizontal shorting line. A p-i-n diode switch on the horizontal shorting line is used to configure the radiation pattern of the antenna. In the off state, the maximum radiation intensity occurs at <TEX>$\pm 45^\circ$</TEX> to the circular patch. In the on state, the maximum radiation intensity occurs perpendicular to the circular patch. Simulation and measurement results at 2.3 GHz validate the reconfigurability of the proposed design.</P>
Monopole-Like and Boresight Pattern Reconfigurable Antenna
Inseop Lim,Sungjoon Lim IEEE 2013 IEEE transactions on antennas and propagation Vol.61 No.12
<P>A novel pattern reconfigurable antenna is proposed to achieve two different radiation patterns by controlling the bias voltage of switches. Initially, the proposed antenna operates as a top-loaded monopole antenna fed by a co-planar waveguide (CPW). When the slot from the CPW is disturbed by switching on PIN diodes, it operates as a slot antenna. Therefore, when the switch turns on, the maximum radiation intensity occurs at the normal to the aperture surface defined as the boresight direction, which is similar to a slot antenna. When the switch turns off, the maximum radiation intensity occurs at right angles to the boresight direction, which is similar to a monopole antenna. The pattern reconfigurable capability is successfully demonstrated at 2.3 GHz by full-wave simulation and measurement.</P>
Substrate-Integrated-Waveguide (SIW) Single-Pole-Double-Throw (SPDT) Switch for X-Band Applications
Inseop Lim,Sungjoon Lim IEEE 2014 IEEE microwave and wireless components letters Vol.24 No.8
<P>A substrate-integrated-waveguide (SIW) single-pole double-throw (SPDT) switch is presented for X-band applications. Inductive posts with rectangular slots are embedded in the SIW to control the traveling EM wave. By adding PIN diodes on the top slots of the inductive posts, we achieved the ability to switch in the SIW technology; then, an SIW SPDT switch was designed. The proposed SPDT switch has a measured isolation (S31) of greater than 10 dB, isolation (S32) of greater than 15 dB, and an insertion loss (IL) of less than 2.55 dB, from 8.24-10.36 GHz.</P>
곡률에 독립적인 플렉서블 기판 위에 설계된 영차 공진 안테나
임인섭(Inseop Lim),정진우(Tony J. Chung),임성준(Sungjoon Lim) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.1
본 논문에서는 가요성(flexible) 있는 영차 공진 안테나를 제안하였다. 안테나의 성능을 결정하는 본 논문의 위상 상수는 영차 공진일 때 기판의 변형에 독립적이다. Composite right/left-handed(CRLH) 전송 선로를 영차 공진 현상을 실현하기 위해 coplanar waveguide technology(CPW)를 기반으로 구현되었다. CRLH는 병렬 인덕턴스와 직렬 캐패시턴스를 추가함으로써 메타 물질로 구현된다. 추가적인 회로 변수를 만들기 위해 칩 인덕터와 갭 캐패시터가 각각 추가되었다. 제안된 ZOR 안테나는 대역폭 6.5 %와 최대 이득 0.69~1.39 ㏈i으로 좋은 성능을 보인다. 시뮬레이션과 측정 결과를 통해서 곡면의 지름이 서로 다른 각각 30, 50, 70 ㎜ 뿐만 아니라 평면일 때 공진 주파수와 방사 패턴이 거의 변하지 않았음을 보였다. In this paper, we propose a flexible zeroth-order resonant(ZOR) antenna. Its zero phase constant ensures that the antenna performance is independent of substrate deformation. A composite right/left-handed transmission line is designed based on coplanar waveguide technology to realize the zeroth-order resonance phenomenon. The CRLH is an implementation of metamaterial(left handed material) which is composed of shunt inductance and series capacitance. In order to yield additional circuital parameter, chip inductor and gap capacitor is added, respectively. The proposed ZOR antenna provides good performances: reasonable bandwidth(6.5 %) and peak gain(0.69~1.39 ㏈i). Simulated and measured results show that the antenna’s resonant frequencies and radiation patterns are almost unchanged at different curvature diameters of 30, 50, 70 ㎜, as well as for a flat surface.
Lim, Sanghyun,Lee, Kukjoo,Shin, Inseop,Tron, Artur,Mun, Junyoung,Yim, Taeeun,Kim, Tae-Hyun Elsevier Sequoia 2017 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>The practical applications of Si electrodes in lithium-ion batteries are limited since they undergo large changes in volume during charge and discharge, and consequently become highly deteriorated. A novel binder system holding silicon particles together and preventing disintegration of the electrode during operation hence needs to be developed to enable reliable cycleability. In the current work, such a new polymer binder system, based on poly(acrylic acid) (PAA) and poly(ethylene glycol-<I>co</I>-benzimidazole) (PEGPBI), is developed for silicon anodes. The physical crosslinking using acid-base interactions between PAA and PBI, together with the ion-conducting PEG group, yields physical properties for the resulting PAA-PEGPBI-based anodes that are better than those of electrodes based on the currently available PAA binder, and yields good cell performances. A Si-based electrode with high loading levels of 1.0–1.3 mg cm<SUP>−2</SUP> (0.7–0.91 Si mg cm<SUP>−2</SUP>) is reliably manufactured using specifically PAA-PEGPBI-2, which is made with 2 wt% of PEGPBI relative to PAA, and shows a very high capacity value of 1221 mAh g<SUP>−1</SUP> at a rate of 0.5 C after 50 cycles, and a high capacity value of more than 1600 mAh g<SUP>−1</SUP> at a high rate of 2 C.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Physically-crosslinked polymer binders are developed for Si anode. </LI> <LI> Physical and electrochemical properties of new binders are investigated. </LI> <LI> Reversible acid-base interaction and ion conductivity are provided to new binders. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>