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Novel approach to optimizing a broadband right-angle coaxial-to-microstrip transition
Roh, Jin-Eep,Li, Jun-Wen,Ahn, Bierng-Chearl,Park, Chan-Sik,Cha, Eun-Jong Wiley Subscription Services, Inc., A Wiley Company 2007 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.49 No.2
<P>A new approach to the optimization of a broadband right-angle coaxial-to-microstrip transition is presented. The right-angle transition finds many applications where printed circuits need to be fed from behind the ground plane using coaxial connectors. To obtain low reflections over the whole operating frequency range of the transition, dimensional parameters, such as ground aperture and probe diameters, ground aperture offset, and microstrip stub length are optimized using a commercial electromagnetic simulation software. Results are presented for the optimum right-angle transition from an SMA connector to a 50-Ω microstrip line on common reinforced PTFE substrates. Measurements of a fabricated transition on a 31-mil thick substrate show that its reflection coefficient is less than −20 dB and the insertion loss is less than 0.5 dB over 0.05–20 GHz. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 451–456, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22151</P>
유도무기용 전파고도계 주파수변환기 및 Ku-대역 안테나 개발
김태훈,노진입,Kim, Taehoon,Roh, Jin-Eep 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.6
A radar altimeter which measures the distance using radio wave developed by domestic technology has been applied to various missiles. It is used also for calculating the error of integrated navigation technique. There are a couple of methods to reduce the error but in this paper, we proposed to utilize existing C-band radar altimeter main body with frequency conversion. We designed and manufactured the frequency converter and Ku-band antenna to accomplish this goal. From the test results of products' function and performance, we could expect the possibility of applying this method to enhance the missiles' integrated performance.
Woodpecker-inspired shock isolation by microgranular bed
Yoon, Sang-Hee,Roh, Jin-Eep,Kim, Ki Lyug Institute of Physics [etc.] 2009 Journal of Physics. D, Applied Physics Vol.42 No.3
<P>This paper presents a woodpecker-inspired shock isolation (SI) using a microgranular bed to protect micromachined electronic devices (MEDs) for high-<I>g</I> military applications where mechanical excitations reach up to tens of thousands of <I>g</I>s and several hundreds of kHz. The shock isolating phenomenon in the microgranular bed within a metal housing, biomimetically inspired from a spongy bone within a skull of the woodpecker, controls unwanted high-frequency mechanical excitations so that their adverse effects on the embedded MEDs are kept within acceptable limit. The microgranular bed composed of close-packed microglass beads reduces the mechanical excitations transmitted to the MEDs through kinetic energy absorption. Two kinds of tests, a laboratory test and a 60 mm air-gun test, have been made. The laboratory test using a vibration exciter up to 25 kHz has demonstrated that the cut-off frequency (2.2–15.8 kHz) and roll-off steepness (−155.0 to −78.7 dB decade<SUP>−1</SUP>) are inversely proportional to the diameter of the close-packed microglass beads (68–875 µm), whereas the vibration absorptivity (0.23–0.87) is proportional. The 60 mm air-gun test under high-<I>g</I> environments of up to 60 000 <I>g</I> has verified that the woodpecker-inspired SI is superior in improving the shock survivability of the MEDs to the conventional one using hard resin.</P>
장갑표적 감지센서용 94GHz 도파관 하모닉 전압조정발진기 설계 기법
노진입,최재현,리준문,안병철,Roh, Jin-Eep,Choi, Jae-Hyun,Li, Jun-Wen,Ahn, Bierng-Chearl 한국군사과학기술학회 2005 한국군사과학기술학회지 Vol.8 No.3
In this paper, we propose a design method of the millimeter-wave(W-Band) waveguide cavity harmonic voltage controlled oscillator(VCO) using a Gunn diode for the armor sensor. Using the 3-dimensional simulation tool(Ansoft $HFSS^{TM}$), we were able to find the impedance matching point between waveguide and Gunn diode and estimate the oscillation frequency. A varactor diode is used for the frequency tuning, and we find out the equation for the calculation of the tunable frequency range. The designed VCO shows good performances; 17dBm output power at 94GHz center frequency, 520MHz frequency tuning range similar to the estimated value(480MHz).
지상 접근 표적 감지를 위한 초소형 K-대역 레이다 연구
하종수(Jong-Soo Ha),노진입(Jin-Eep Roh),최재현(Jae-Hyun Choi),이한진(Han-Jin Lee),박영식(Young-Sik Park) 한국전자파학회 2017 한국전자파학회논문지 Vol.28 No.4
본 논문에서는 능동방호 시스템의 소형 근접신관에 적용되는 초소형 K-밴드 레이다를 제안한다. 지상 환경에서는 클러터가 산재되어 있기 때문에 접근하는 소형 표적을 감지하기는 쉽지 않다. 또한 이러한 환경에서 레이다의 표적 정확도를 향상시키면서 동시에 소형 근접신관용으로 레이다를 소형화하기에는 어려움이 따른다. 이러한 어려움을 해결하기 위해 본 연구에서는 초소형 K-밴드 레이다의 시스템 분석 및 설계, 안테나 설계, 송수신 및 신호처리기 설계를 제시한다. 이후 일부 시험 결과를 제시하고 그 결과를 분석함으로써 제안하는 연구의 타당성을 검증한다. This paper proposes a compact K-band radar applied to a miniature proximity fuze for the active defense system. In this terrestrial environment, it is not easy to detect approaching small targets because the clutter is scattered. In addition, it is difficult to miniaturize the radar for the small proximity fuze while improving the target accuracy of the radar in such environments. To solve these difficulties, this study presents system analysis and design, antenna design, and transceiver and signal processor design of the compact K-band radar. Some test results are presented and the results are analyzed, the validity of the proposed study is examined.
Design of an FMCW Radar Altimeter for Wide-Range and Low Measurement Error
Jae-Hyun Choi,Jong-Hun Jang,Jin-Eep Roh Institute of Electrical and Electronics Engineers 2015 IEEE Transactions on Instrumentation and Measureme Vol. No.
<P>This paper presents the design of a frequency-modulated continuous-wave radar altimeter with wide altitude range and low measurement error. A wide altitude range is attained by employing an optical delay in the path of transmission to reduce the dynamic range of the altitude being measured. The transmitter power and receiver gain are also controlled to facilitate a reduction in the dynamic range of the received power. In addition, low measurement error was obtained by improving the sweep linearity using a direct digital synthesizer and minimizing phase noise by employing a phase-locked loop with the offset frequency driven by a reference clock (Ref_CLK). The performance of the radar altimeter was experimentally verified using an optical-delay simulator, which provided a delay time corresponding to a 200-m radar distance. To assess the performance of the system in a realistic setting, the radar altimeter was tested using a crane setup. The crane test demonstrated that the design described in this paper resulted in a reduced measurement-error rate.</P>
광 지연선 기반의 넓은 고도 범위를 갖는 고정밀 FMCW 전파고도계 송수신기 설계
최재현(Jae-Hyun Choi),장종훈(Jong-Hun Jang),노진입(Jin-Eep Roh) 한국전자파학회 2014 한국전자파학회논문지 Vol.25 No.11
본 논문은 넓은 고도 범위와 낮은 측정 오차를 갖는 주파수 변조 연속파(FMCW) 레이더 고도계의 설계 방안을 제안한다. 측정 고도의 동적 범위를 줄이기 위해 전파 고도계의 송신 경로에 광 지연선을 적용하여 넓은 고도 범위를 얻을 수 있다. 송신 전력과 수신단 이득을 제어하여 또한 수신 전력의 동적 범위를 줄일 수 있다. 더불어, 직접 디지털 합성기를 사용하여 변조 선형성을 향상시키고, 기준 클럭 신호를 위상 고정 루프의 옵셋(offset) 주파수로 사용하여 위상잡음을 최소화함으로써 낮은 고도 측정오차를 갖는다. This paper presents the design of a Frequency Modulated Continuous Wave(FMCW) radar altimeter with wide altitude range and low measurement errors. Wide altitude range is achieved by employing the optic delay in the transmitting path to reduce the dynamic range of measuring altitude. Transmitting power and receiver gain are also controlled to have the dynamic range of the received power be reduced. In addition, low measurement errors are obtained by improving the sweep linearity using the Direct Digital Synthesizer(DDS) and minimizing the phase noise employing the reference clock(Ref_CLK) as the offset frequency of the Phase Locked Loop(PLL).