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저잡음 Feedforward 초고주파 증폭기를 위한 온도안정 지연선로의 설계
吳承燁 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.2
This paper presents the design on MIC delay lines on the (ZrSn) ceramic substrate which has characteristics of high dielectric constant and stable temperature coefficient. This type of delay lines will meet the requirements of the time delay elements in the MMIC feed-forward M/W LNAs. The procedures of the design take frequency dispersion and loss of the microstrip lines into account, and also the effect of the temperature expansion coefficient is compensated by minus temperature coefficient of dielectric constant. The results of experiment show that the error of delay time of the delay line is about 1.25% in the range of 9-10GHz and temperature stability is very good (±0.5ppm/℃)
사각형 마이크로 스트립 선열 안테나의 설계에 관한 연구
오승엽,민경일 충남대학교 공업교육연구소 1984 論文集 Vol.7 No.2
The purpose of this study is to provide an equivalent network and design procedure for square and rectangular shaped linear array microstrip antennas. First, the characteristics of microstrip-line are described. Second, the antenna parameters. such as equivalent admittance, radiation pattern, resonant frequency and directivity of single slot are derived. Third, a design procedure for open-ciruit half-wave resonator and for high gain microstrip linear array antennas are considered. Finally, X-Band antennas of single-element, four-element and sixteen-element linear array with same resonant frequency are built by photo-etching techniqes and tested. The measured gain is 18[dB] and the side-lobe level was measured to 11[dB] for the sixteen-element two dimensional array. Its gain is increased 11[dB] and its beam-width is decreased 22° than those of single-element. The results show that the method presented in this paper has sufficient generality and accuracy to be applicable to design problems of microstrip array antennas.
雙円錐形 안테나를 利用한 미리波·써브 미리波帶의 檢出回路素子
吳承燁,小野昭一 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.2
In this paper, we discuss the biconical antenna with spherical reflector to use it as a milliand submilli-meter wave detection device with Schottky diode. First, this structure is experimented as an oscillator device at X-band frequency with Gunn diode and at 80 GHz frequency with Impatt diode to find its characterics as a resonator. Second, the structure is tested as a receiving device with Schottky diode at X-band and Infrared-Band to find its characteristics as an antenna. Our experiments show that: 2) This structure is convenient for impedance matching with solid-state elements. 2) Resonant frequencies of the structure are changed by a moving spherical reflector, but its range is narrow. 3) As an antenna, its directivity is good and then this antenna is a proper one to receive the sub-millimeter wave laser whose beam is a spherical Gaussian form.
홍봉식,김태균,오승엽,김환우,권오석 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(A)
The currenty offered experiment courses are completely reconsidered and reconfigured. The whole subjects are divided into 10 seperate courses, each of which should represent either basic or advanced stages of differing fields of the electronic engineering. It has been aimed that the courses form an elaborate hierachy so that they are minimally redundant but linked to one another in their fringes. Also, it has been pursued that the new courses should not fall obsolete in at last next five years exploring the maximum possibilities of the currently available equipments.
Parallel-Branch Spiral Inductors with Enhanced Quality Factor and Resonance Frequency
Hyun-Cheol Bae,Seung-Hyeub Oh 한국전자파학회JEES 2008 Journal of Electromagnetic Engineering and Science Vol.8 No.2
In this paper, we present a cost effective parallel-branch spiral inductor with the enhanced quality factor and the resonance frequency. This structure is designed to improve the quality factor, but different from other fully stacked spiral inductors. The parallel-branch effect is increased by overlapping the first metal below the second metal with same direction. Measurement result shows an increased quality factor of 12 % improvement. Also, we show an octagonal parallel-branch inductor which reduces the parasitic capacitances for higher frequency applications.
A 5-㎓ Band CCNF VCO Having Phase Noise of -87 ㏈c/㎐ at 10㎑ Offset
Bo-Woo Kim,Seung-Hyeub Oh,Ja-Yol Lee,Sang-Heung Lee,Jin-Young Kang 한국전자파학회JEES 2004 Journal of Electromagnetic Engineering and Science Vol.4 No.3
In this paper, we present a new current-current negative feedback(CCNF) differential voltage-controlled oscillator (VCO) with l/f induced low-frequency noise suppressed, By means of the CCNF. the 1/f induced low-frequency noise is removed from the proposed CCNF VCO Also, high-frequency noise is stopped from being down-converted into phase noise by means of the increased output Impedance through the CCNF and the feedback capacitor Cf The proposed CCNF VCO represents 11-dB reduction in phase noise at 10 ㎑ offset, compared with the conventional differential VCO The phase noise of the proposed CCNF VCO is measured as -87 ㏈c/㎐ at 10 ㎑ offset frequency from 5.5-㎓ carrier The proposed CCNF VCO consumes 14.0 ㎃ at 2.0 V supply voltage, and shows single-ended output power of - 12 ㏈m<br/> <br/>
Bae, Hyun-Cheol,Oh, Seung-Hyeub The Institute of Electronics and Information Engin 2008 Journal of semiconductor technology and science Vol.8 No.3
In this paper, a wideband power efficient 2.2 GHz - 4.9 GHz Medium Power Amplifier (MPA), has been designed and fabricated using $0.8{\mu}m$ SiGe BiCMOS process technology. Passive elements such as parallel-branch spiral inductor, metal-insulator-metal (MIM) capacitor and three types of resistors are all integrated in this process. This MPA is a two stage amplifier with all matching components and bias circuits integrated on-chip. A P1dB of 17.7 dBm has been measured with a power gain of 8.7 dB at 3.4 GHz with a total current consumption of 30 mA from a 3 V supply voltage at $25^{\circ}C$. The measured 3 dB bandwidth is 2.7 GHz and the maximum Power Added Efficiency (PAE) is 41 %, which are very good results for a fully integrated Medium PA. The fabricated circuit occupies a die area of $1.7mm{\times}0.8mm$.
Kyu-Song Lee,Seung-Hyeub Oh 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
A novel wideband 4-way quadrature power divider is designed and fabricated for the balanced HPA of VHF band which covers over 5-octave bandwiths. Measured results show insertion loss of less than 0.5㏈, return loss of better than 18㏈, isolation of better than 19㏈ and phase balance of 90 ± 10.7° from 20㎒ to 110㎒.