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테이퍼드 발룬을 포함한 계단형의 다이폴 안테나 설계 및 구현
이현진(Hyeonjin Lee),김태홍(Tea-Hong Kim) 대한전기학회 2015 전기학회논문지 P Vol.64 No.3
In this paper, a step type driver dipole antenna with a tapered balance and unbalance (balun) by a coplanar waveguide (CPW) to coplanar strip (CPS) transition is proposed. The proposed antenna consisted of step type driver, a CPW to CPS transition and tapered balun. The proposed antenna is realized the multi and wide resonate frequency band to introduce the step type driver and tapered balun. The step type driver is acted as a director too. This antenna could be more easily designed than the conventional printed quasi-Yagi dipole antenna. The operating frequency bandwidth was 650 [MHz] (2.65~3.3 GHz), 900 [MHz] (4.7~5.6 GHz) under a return-loss criterion of less than 10 dB. The measurements of the proposed antenna exhibited good results in the wideband operating frequency and radiation pattern. The proposed antenna can support wireless communications applications.
이현진(Hyeonjin Lee),최태일(Tea-Il Choi) 대한전기학회 2012 전기학회논문지 P Vol.61 No.1
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].
이현진(Hyeonjin Lee),정진우(Jinwoo Jung),임영석(Yeongseog Lim) 대한전자공학회 2008 電子工學會論文誌-TC (Telecommunications) Vol.45 No.7
본 논문에서는 모노폴 안테나를 변형한 평면형 모노폴 안테나를 제안하였다. 제안된 안테나의 루프구조 중심부를 개방하고 일정 부분을 내부로 접어서 안테나의 선로간의 커페시턴스를 증가하여 리액턴스 값을 최소화 하였으며, 또한 안테나의 크기를 약 20%정도 최소화하였다. 제안된 안테나는 단일 평면으로 구현할 수 있는 CPW(Coplanar waveguide)급전방법을 이용하였다. 안테나의 이득은 최대 3.1[㏈i]이며 대역폭은 VSWR?2를 기준하여 900㎒ (2.6~3.56㎓])로 29.9% 대역폭을 얻었다. 이는 S-DMB대역을 충족시킬 수 있다. In this paper, the several printed square loop antennas which modified monopole antennas are proposed . The proposed antennas are reduced about 20% physical size of antenna and miniaturized reactance value of impedance due to fold center part of the loop. They obtained omni-directional radiation patterns with broad bandwidth and feed method used coplanar waveguide to composed single planar. The proposed antenna bandwidth is about 900㎒(2.63~3.56[㎓]) resonance frequency on VSWR?2. it can be sufficiency of S-DMB band.
이현진(Hyeonjin Lee) 대한전기학회 2012 전기학회논문지 P Vol.61 No.1
In this paper, the planar type modified folded loop antennas for S-DMB band is proposed. The proposed antenna consisted of opened center of a conventional closed loop and folded terminal of microstrip line to inside loop antenna. The sizes proposed antenna was minimized by folding the terminal of the loop. Also, It was minimized reactance value by increasing capacitances between coupled microstrip line. Therefore the proposed antennas compacted about 20% than a conventional loop antenna and increased efficiency of antenna. The proposed antennas got an omni-directional pattern, the antenna gain was 3.67 [dBi] and the bandwidth was 900 MHz (2.6-3.56 GHz) with VSWR≤2 from the simulated and the measured results. The frequency utilization coefficient was 29.9 %. These properties could satisfy the S-DMB band.