• Title/Summary/Keyword: Periodically ground structure

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A Low Impedance and Short Guided-Wavelength Microstripline Employing a Periodically Perforated Ground Metal and Its Application to Miniaturized Ratrace MMIC (주기적 홀을 가지는 접지 금속막을 이용한 저임피던스/단파장 선로와 MMIC용 소형 레트레이스에의 응용)

  • Yun, Young
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.7
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    • pp.727-733
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    • 2003
  • In order to realize miniaturized and low-impedance MMIC passive component, a novel microstripline structure employing periodically perforated ground metal was proposed. The novel microstripline structure showed much lower impedance, and shorter guided-wavelength than conventional one. Using the novel microstripline with periodically perforated ground metal, a miniaturized 15 $\Omega$ ratrace was fabricated. The line width of the ratrace was 20 $\mu\textrm{m}$, and the size of it was 0.375 mm$^2$, which is 9.3 % of conventional one. The ratrace exhibited good RF performances from 20 to 30 GHz.

Highly Miniaturized and Low impedance Wilkinson Power Divider on RFIC/MMIC for application to IT components of Ocean Engineering (해양 IT 소자에의 응용을 위한 RFIC/MMIC용 초소형 저임피던스 윌킨슨 전력분배기 설계)

  • Kim, Choong-Ryul;Yun, Young
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.06a
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    • pp.412-416
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    • 2005
  • In this paper we propose low-impedance and miniaturized a wilkinson power divider on MMIC passive component which was fabricated by a novel microstrip line structure employing periodically perforated ground metal (PPGM). The novel microstrip line structure showed much lower impedance and shorter guided-wavelength than conventional one. Using the novel microstrip line with periodically perforated ground metal, a miniaturized 17 ${\Omega}$ power divider was fabricated. The line width of the power divider was 20 ${\mu}m$, and the size of it was 0.110 $mm^2$, which is 21 % of conventional one. The power divider exhibited good RF performances from 10 to 20 GHz.

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A Study on Characteristics of the Transmission Line Employing Periodically Perforated Ground Metal on GaAs MMIC and Its Application to Highly Miniaturized On-chip Impedance Transformer Employing Coplanar Waveguide (GaAs MMIC상에서 주기적으로 천공된 홀을 가지는 접지 금속막 구조를 이용한 전송선로 특성연구 및 코프레너 선로를 이용한 온칩 초소형 임피던스 변환기에의 응용)

  • Yun, Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.8
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    • pp.1248-1256
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    • 2008
  • In this paper, basic characteristics of transmission line employing PPGM (periodically perforated ground metal) were investigated using theoretical and experimental analysis.According to the results, unlike the conventional PBG (photonic band gap) structures, the characteristic impedance of the transmission line employing PPGM structure showed a real value, which exhibited a very small dependency on frequency. The transmission line employing PPGM structure showed a loss (per quarter wave length) higher by $0.1{\sim}0.2\;dB$ than the conventional microstrip line. According to the investigation of the dependency of RF characteristic on ground condition, the RF characteristic of the transmission line employing PPGM structure was hardly affected by the ground condition in the frequency lower than Ku band, but fairly affected in the frequency higher than Ku band, which indicated that coplanar waveguide employing PPGM structure was optimal for RF characteristic and reduction of size. Considering above results, impedance transformer was developed using coplanar waveguide with PPGM structure for the first time, and good RF characteristics were observed from the impedance transformer. In case that {\lambda}/4$ impedance transformer with a center frequency of 9 GHz was fabricated for a impedance transformation from 20 to10 {\Omega}$, the line width and length were 20 and $500\;{\mu}m$, respectively, and its size was only 0.64 % of the impedance transformer fabricated with conventional microstrip lines. Above results indicate that the transmission line employing PPGM is a promising candidate for a development of matching and passive elements on MMIC.

Development of Short-Wavelength Transmission Line Employing Periodically Perforated Ground Metal for Application to Miniaturized On-chip Passive Components on Si RFIC (Si RFIC상의 온칩 수동소자에의 응용을 위한 주기적 접지 금속막 선로를 이용한 단파장 전송선로 개발)

  • Joh, Han-Nah;Park, Young-Bae;Yun, Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.2
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    • pp.330-335
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    • 2008
  • In this study, highly miniaturized short-wavelength transmission line employing periodically perforated ground metal (PPGM) structures were developed for application to miniaturized on-chip passive component on Si RFIC. The transmission line employing PPGM structure showed shorter wavelength and lower characteristic impedance than conventional coplanar-type transmission line. The wavelength of the transmission line employing PPGM structure was 57% of the conventional coplanar-type transmission line on Si Radio Frequency Integrated Circuit (RFIC) substrate. Basic characteristics of the transmission line employing PPGM structure were also investigated in order to evaluate its suitability for application to a development of miniaturized passive on-chip components. According to the results, it was found that the PPGM structure is a promising candidate for application to a development of miniaturized on-chip passive components on Si RFIC.

A Study on Basic Characteristics of a Coplanar-type Transmission Line Employing Periodic Structure on Si RFIC (Si RFIC상에서 주기적 구조를 이용한 코프레너형 전송선로의 기본특성연구)

  • Joh, Han-Nah;Park, Young-Bae;Yun, Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.6
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    • pp.964-973
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    • 2008
  • In this study, a short-wavelength coplanar-type transmission line employing periodic ground structure (PGS) was developed for application to miniaturized on-chip passive component on Si Radio Frequency Integrated Circuit (RFIC). The transmission line employing PGS showed shorter wavelength and lower characteristic impedance than conventional coplanar-type transmission line. The wavelength of the transmission line employing PGS structure was 57 % of the conventional coplanar-type transmission line on Si substrate. Using the theoretical analysis. basic characteristics of the transmission line employing PGS (e.g., bandwidth. loss, impedance, and resonance characteristics) were also investigated in order to evaluate its suitability for application to a development of miniaturized passive on-chip components on silicon RFIC. According to the results. the bandwidth of the transmission line employing PGS was more than 895 GHz as long as T is less than 20${\mu}m$, and the resonance characteristic was observed in 1239 GHz, which indicates that the PPGM structure is a promising candidate for application to a development of miniaturized on-chip passive components on Si RFIC.

A Study on a Meander line employing Periodic Patterned Ground Structure on GaAs MMIC (GaAs MMIC 상에서 주기적 접지구조를 가지는 미앤더 선로에 관한 연구)

  • Jung, Bo-Ra;Yun, Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.2
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    • pp.325-331
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    • 2010
  • In this study, highly miniaturized short-wavelength meander line employing eriodically patterned ground structure (PPGS) was developed for application to miniaturized on-chip passive component on GaAs MMIC (monolithic microwave integrated circuit). The meander line employing PPGS showed shorter wavelength and slow-wave characteristic compared with conventional meander line. The wavelength of the meander line employing PPGS structure was 17 % of the conventional meander line on GaAs MMIC. Due to its slow-wave structure, the meander line employing PPGS exhibited large propagation constant than conventional meander line, which resulted in larger phase shift and shunt inductance value. Above results indicate that the meander line employing PPGS is a promising candidate for application to a development of miniaturized on-chip RF components as well as inductor with a high inductance value on GaAs MMIC.

Stopband Extension of Slow-wave Bandpass Filters Using Ring Resonators (링 공진기를 사용한 저속파 대역통과 여파기의 저지대역 확장)

  • 배은규;석창헌;심보환;제영태;이문수
    • Proceedings of the IEEK Conference
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    • 2003.11c
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    • pp.317-322
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    • 2003
  • In this paper, we design a slow-wave bandpass filter that uses a microstrip line periodically loaded with microstrip ing resonators for WLAN(5 GHz). Unlike conventional slow-wave filters, this filter is designed to produce a narrow passband at the fundamental mode of the resonators and provide lower insertion loss than that of parallel- or cross-coupled ring bandpass filters. A PBG(Photonic Band Gap) structure patterned in the ground plane is used to suppress the spurious transmission and extend out-of-band rejections Experimental result shows that the first spurious response in the stopband of the slow-wave bandpass filter can be rejected using a PBG structure.

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Blind Drift Calibration using Deep Learning Approach to Conventional Sensors on Structural Model

  • Kutchi, Jacob;Robbins, Kendall;De Leon, David;Seek, Michael;Jung, Younghan;Qian, Lei;Mu, Richard;Hong, Liang;Li, Yaohang
    • International conference on construction engineering and project management
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    • 2022.06a
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    • pp.814-822
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    • 2022
  • The deployment of sensors for Structural Health Monitoring requires a complicated network arrangement, ground truthing, and calibration for validating sensor performance periodically. Any conventional sensor on a structural element is also subjected to static and dynamic vertical loadings in conjunction with other environmental factors, such as brightness, noise, temperature, and humidity. A structural model with strain gauges was built and tested to get realistic sensory information. This paper investigates different deep learning architectures and algorithms, including unsupervised, autoencoder, and supervised methods, to benchmark blind drift calibration methods using deep learning. It involves a fully connected neural network (FCNN), a long short-term memory (LSTM), and a gated recurrent unit (GRU) to address the blind drift calibration problem (i.e., performing calibrations of installed sensors when ground truth is not available). The results show that the supervised methods perform much better than unsupervised methods, such as an autoencoder, when ground truths are available. Furthermore, taking advantage of time-series information, the GRU model generates the most precise predictions to remove the drift overall.

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Mass Memory Operation for Telemetry Processing of LEO Satellite (저궤도위성 원격측정 데이터 처리를 위한 대용량 메모리 운용)

  • Chae, Dong-Seok;Yang, Seung-Eun;Cheon, Yee-Jin
    • Aerospace Engineering and Technology
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    • v.11 no.2
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    • pp.73-79
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    • 2012
  • Because the contact time between satellite and ground station is very limited in LEO (Low Earth Orbit) satellite, all telemetry data generated on spacecraft bus are stored in a mass memory and downlinked to the ground together with real time data during the contact time. The mass memory is initialized in the first system initialization phase and the page status of each memory block is generated step by step. After the completion of the system initialization, the telemetry data are continuously stored and the stored data are played back to the ground by command. And the memory scrubbing is periodically performed for correction of single bit error which can be generated on harsh space environment. This paper introduces the mass memory operation method for telemetry processing of LEO satellite. It includes a general mass memory data structure, the methods of mass memory initialization, scrubbing, data storage and downlink, and mass memory management of primary and redundant mass memory.

Evaluation of the Septic Tank Performance in the Sewage Treatment Area and Suggestion of an Optimum Model (하수처리구역내 단독정화조의 성능평가 및 최적 모형의 제안)

  • Lim, Bong-Su;Jung, Keum-Hee;Wang, Ze-Jie
    • Journal of Korean Society on Water Environment
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    • v.23 no.3
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    • pp.403-409
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    • 2007
  • This study was carried out to recommend the systematic improving practice for the effective operation of septic tank, and the evaluation of its BOD and nutrient removal efficiency depending on process, the survey of characteristics of FRP material, and the suggestion of optimum septic tank model within sewage treatment area. The average BOD concentration and BOD removal efficiency of septic tank which was carried out the cleaning periodically in 63.9 mg/L and 77.8%, shows good quality better than the septic tank which was not carried out the cleaning regularly. Maximum load of tensile, flexural and compressive strength increased in proportion to its thickness, and the contents standard 25% of glass fiber required upgrade over than 30%. Configuration and performance for the optimum of the septic tank suggests that over $0.75m^3$ of the effective total volume, adding to over $0.25m^3$ a man for more than 5 men of the treated person, retention time should be within one day. Improving plans about facility and materials quality of the septic tank have an obligation that protective wall ought to install on the concrete bottom and side faces to prevent crumble or transform from loading of the ground or upper part of the structure on the tank setting. And it is eliminated the uneffective resisting pressure and it keeps off circulate imperfect products by strengthening of the test methods such as stretching strength, pressing strength, glass fiber contents and thickness.