Seung-hyeup Oh

Chungnam National University

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Co-Authors

In‐Bok Yom

Electronics and Telecommunications Research Institute

Inkwon Ju

Electronics and Telecommunications Research Institute

Dong‐Pil Chang

Electronics and Telecommunications Research Institute

Pyoungho Lee

SangHyun Chang

Samsung (South Korea)

ChangSoo Kwak

Electronics and Telecommunications Research Institute

Jeong‐Won Lee

Chosun University

Dong-Un Park

Rok-Yeon Hwang

Rural Development Administration

Ho-sin Lee

Electronics and Telecommunications Research Institute

Cooperative Institutions

Electronics and Telecommunications Research Institute

Korea University

GS Caltex (South Korea)

Samsung (South Korea)

Korea Advanced Institute of Science and Technology

Chungnam National University

Rural Development Administration

University of Southern California

California Institute of Technology

Green Technology Center

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Novel vertical transition using a trough line, a slab line and shielded multilayer coplanar waveguides for 50 GHz LTCC hermetic SMT MMIC package

European Microwave Integrated Circuit Conference (2007)

Inkwon Ju In‐Bok Yom Seung-hyeup Oh

A new vertical transition using a trough line, a slab line and shielded multilayer coplanar waveguides (SMCPW) was proposed in order to develop a DC to 50 GHz band low loss LTCC hermetic surface mounting (SMT) MMIC package. The trough line, the slab line and the SMCPWs were employed to minimize the radiation loss, crosstalk and discontinuity of the conventional via vertical transition. The proposed vertical transition was made with the multiple transmission lines that consist of the SMCPW1 - trough line - slab line - SMCPW2 - SMCPW3. The manufactured LTCC hermetic SMT MMIC package showed the low insertion loss less than 0.6 dB and the reflection loss below −20 dB in the frequency range from DC to 53 GHz.

Shielded cable

Slab

Coplanar waveguide

10.1109/emicc.2007.4412775

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Citations (3)

RF performance Analysis for Galileo Receiver Design

ICEIC : International Conference on Electronics, Informations and Communications (2010)

SangHyun Chang Il-Kyoo Lee Dong‐Pil Chang Youngwoo Lee Seung-hyeup Oh

This paper presents the effects of RF performance parameters on the Galileo receiver design via simulation after reviewing the requirements of the Galileo receiver structure. At first, we considered the general requirements, structure and characteristics of the Galileo system. Then we designed the Galileo receiver focused on performance requirement of 16 ㏈ C/N which is equal to 15 % Error Vector Magnitude (EVM) by using Advanced Design System (ADS) simulation program. In order to verify the function of Automatic Gain Control (AGC)), we measured the IF output power level by changing the input power level at the front - end of the receiver. We analyzed the performance degradation due to phase noise variations of Local Oscillator (LO) in the Galileo receiver through EVM when the minimum sensitivity level of -127 ㏈m is applied at the receiver. We also analyzed the performance degradation according to variable Analog-to-Digital Converter (ADC) bits within the Dynamic range, -92 ~ -139 ㏈m, which has been defined by gain range (-2.5 ~ +42.5 ㏈) in the AGC operation. The results clearly show that the performance of the Galileo receiver can be improved by increasing ADC bits and reducing Phase Noise of LO.

Galileo (satellite navigation)

RF front end

Radio receiver design

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Qualification Model 4x4 Microwave Switch Matrix for the COMS Ka-Band Communication Payload

25th AIAA International Communications Satellite Systems Conference (organized by APSCC) (2007)

Inkwon Ju In Bok Yom Seung-hyeup Oh

[Abstract] This paper presents the design and test results of the Qualification Model 4x4 Microwave Switch Matrix (MSM) using PIN diode switches for the Communication, Oceanographic, and Meteorological Satellite (COMS) Ka-band communication payload. The parallel capacitance of a PIN diode restricts the isolation of the series PIN diode switch and the switch driver circuit limits the switching speed of PIN diode switch. The resonant circuitry and the TTL compatible switch driver circuit are proposed to obtain high isolation and high switching speed. High path isolation in the 4x4 MSM module was accomplished by using the appropriate interconnection cavity between 4-way power divider and SPST switch. The test results of the Qualification Model 4x4 MSM show that insertion loss is 16 dB, on-off isolation is more than 57 dB and on-off transition time is below than 30 ns.

Ka band

Payload (computing)

10.2514/6.2007-3229

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A 6-Bit MMIC Digital Attenuator with High Attenuation Accuracy and Small Phase Variation for X-band TR Module Applications

Journal of the Korea Institute of Military Science and Technology (2009)

Inkwon Ju In‐Bok Yom Jeong‐Won Lee Sooho Lee Chang‐Soo Ahn

A 6-bit MMIC digital attenuator applicable to X-band TR module has been developed by using GaAs pHEMT processes. The Switched-T attenuator scheme and the switched-path attenuator scheme were adopted to obtain low insertion loss and small phase variation, respectively. Resistors and transmission lines are optimized to achieve the digital attenuator with high attenuation accuracy and small phase variation. The digital attenuator has RMS error of 0.4dB, resolution of 0.5dB and dynamic range of 31.5dB. The measurement results show that in-out VSWRs are less than 1.5, phase variation is from -7 to +2 degrees and IIP3 is 36.5dBm.

Attenuator (electronics)

Source

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MMICs for the COMS(Communication, Ocean and Meteorological Satellite) Ka Band Communications Transponder(Components)

Theory and Applications of Satisfiability Testing (2005)

In‐Bok Yom Dong‐Pil Chang Seung-hyeup Oh Seung Hyeup Oh

Ka band

Transponder (aeronautics)

Communications satellite

Satellite broadcasting

Meteorological satellite

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Citations (0)

Novel vertical transition using a trough line, a slab line and shielded multilayer coplanar waveguides for 50 GHz LTCC hermetic SMT MMIC package

European Microwave Conference (2007)

Inkwon Ju In‐Bok Yom Seung-hyeup Oh

Shielded cable

Slab

Coplanar waveguide

Line (geometry)

10.1109/eumc.2007.4405456

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Citations (1)

Initial Population Dynamics of Citrus Leafminer, Phyllocnistis citrella (Lepidoptera:Gracillariidae) in Spring Season Recently Using Sex Pheromone Trap in Jeju Island in Korea

한국응용곤충학회 학술발표회 (2012)

Pyoungho Lee Jae-Wook Hyun Rok-Yeon Hwang Seung-hyeup Oh

Gracillariidae

Pheromone trap

Source

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Citations (0)

Qualification of MMICs for the COMS (Communication, Ocean and Meteorological Satellite) Ka Band Communications Transponder(Component)

Theory and Applications of Satisfiability Testing (2006)

Dong‐Pil Chang In‐Bok Yom ChangSoo Kwak Seung-hyeup Oh

Transponder (aeronautics)

Communications satellite

Ka band

Satellite broadcasting

Component (thermodynamics)

Source

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Citations (0)

High Performance Vertical Transition from DC to 70 GHz for System-on-Package Applications

Inkwon Ju In‐Bok Yom Ho-sin Lee Seung-hyeup Oh

High performance vertical transition from DC to 70 GHz was proposed for system-on-package (SoP) applications. The trough line, slab line and shielded multilayer coplanar waveguides were employed to minimize the radiation loss, crosstalk and discontinuity of a conventional via vertical transition. The half square via pad was used in order to prevent unwanted coupling between the transmission lines of the vertical transition. The proposed vertical transition was made using a LTCC process. The manufactured single vertical transition showed a low insertion loss less than 0.7 dB and a reflection loss below -13 dB in the frequency range of DC to 70 GHz.

Shielded cable

Reflection loss

Slab

Crosstalk

Discontinuity (linguistics)

10.1109/eumc.2008.4751711

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Citations (8)