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L-Probe 급전 시스템을 이용한 광대역 마이크로스트립 패치 안테나
반창현 ( Chang Hyun Ban ),안병철 ( Bierng Chearl Ahn ) 충북대학교 산업과학기술연구소 2015 산업과학기술연구 논문집 Vol.29 No.1
This paper presents the design of a microstrip patch antenna fed in a successive 90-degree phase difference by four L-probes for circularly polarized radiation over a large bandwidth. Four slits are formed on the patch to increase the isolation between two orthogonal pairs of the L-probe. Design parameters such as patch width and length, L-probe length and height are adjusted to obtain an optimum design. The designed antenna has a reflection coefficient of less than -10dB over 1.43-2.32, a gain of 8.5dB, 8.2dB and 5.0dB, and a boresight axial ratio of 3.0dB, 0.0dB and 2.0dB at 1.6GHz, 2.0GHz, and 2.3GHz respectively.
송창섭 ( Song Chang Seob ),이신호 ( Rhee Shin Ho ),장병욱 ( Chang Pyoung Wuck ),반창현 ( Ban Chang Hyun ) 한국농공학회 1999 韓國農工學會誌 : 전원과 자원 Vol.41 No.3
This study has been performed to confirm the three dimensional effect of the crack reduction and the restrained effect of crack growth for the synthetic fiber reinforced soil. Two types of polypropylene fiber and low plastic clay(CL) were used for the test. And the test variable were fiber length and so on. The results of the study were summarized as follows ; 1) The mixing of synthetic fiber was effective in reducing crack growth due to adhesion between soil particles and synthetic fiber. Especially initlal crack was delayed, as compared with the pure soil, for about 1 day in case of mono filament synthetic fiber and for about 1 or 2 days in case of fibrillated synthetic fiber. 2) As the content and length of synthetic fiber were increased, the effect of crack reduction was increased. It was found that 0.5% fibrillated synthetic fiber with 40mm length reinforced soil had about 3 times more effective than natural soils. 3) In case of the same fiber content and fiber length, the fibrillated synthetic fiber has more effective than the mono filament synthetic fiber for crack reduction.
송창섭 ( Song Chang Seob ),이신호 ( Rhee Shin Ho ),반창현 ( Ban Chang Hyun ),인현식 ( In Hyun Sik ) 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-
This study was performed to ascertain the three-dimensional effect of the crack reduction and the restrained effect of crack growth, and to yield a suitable mixing ratio of the synthetic fiber reinforced soil. The results of the study are as follows ; 1) The synthetic fiber has the resisting force for crack because of the adhesion due to the attraction of soil particles. 2) As the synthetic fiber length and the mixing ratio are increased, mono filament synthetic fiber reinforced soil is increased the effects of crack reduction and the restraint of crack growth. 3) The fibrillated synthetic fiber is more effective than mono filament synthetic fiber for crack. 4) A suitable mixing ratio of synthetic fiber reinforced soil is 0.5% of the fibrillated synthetic fiber.
송창섭 ( Song Chang Seob ),반창현 ( Ban Chang Hyun ),장웅희 ( Chang Woong Hee ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
In this study, a series of test was conducted to show the characteristics of freezing-thawing process on soilcrete using the soft clay in a redevelopment paddy area, was treated with cement and several additives such as Beestar, CaSO<sub>4</sub>, MgO, and Polypropylene fiber. From the results of test, it was found that first additives-cement and beestar-was effective for compressive strength, and the resistance against freezing-thawing process was improved by secondary additives, in the order their effectiveness, i.e. CaSO<sub>4</sub>. Synthetic fiber, MgO, and Beestar.