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Introduction
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1. Overview / Achievements
  •   Microwave systems engineering deals with various aspects of electromagnetics, microwave circuits and systems, and signal processing techniques to make complex microwave systems like radars and communication systems work effectively.
  •   The microwave systems laboratory (MSL) of POSTECH was a member of the Microwave Applications Research Center (MARC) funded by the Ministry of National Defense for 9 years. It developed a unique and probably the first automobile-based synthetic aperture radar (SAR) system in Korea to be used as an experimental vessel to study various SAR techniques and processing algorithms. The experience was invaluable in developing SAR signal processing software for the first airborne SAR system developed by the Agency for Defense Development (ADD) in recent years. The MSL has also developed a radar emulator and an algorithm for helicopter classification, and a short-range FM-CW radar for automobile applications.  The MSL has been recognized by ADD and the radar industries for its achievements in the field, and has been a constant supplier of well-educated and experienced engineers for them.
  •   The electromagnetic interference (EMI) reduction techniques in a printed circuit board (PCB) has also been the topic of research for the MSL for the last 7 years. As a member of Display Technology Research Center funded by LG Electronics Company, the MSL has been studying grounding and layout techniques for PCB which would result in a reduced EMI.
  •   In 2004, the MSL extended its research area to include the communication field. It joined the Center for Broadband OFDM Mobile Access (BrOMA) which is an IT Research Center (ITRC) funded by the Ministry of Knowledge Economy. We developed a spectrum engineering simulator, and the MSL has been using the simulator to study various spectrum parameters for next generation mobile communication systems.  
2. Current research topics and their importance
  1) Radar;  Near-Field SAR algorithm development  
- Using the experiences in developing the automobile-based and airborne SAR systems, we are now working on near-field 2D and 3D stripmap and circular SAR algorithms for ADD. This project will help ADD in developing a near-field SAR system to measure the radar cross sections of large-size military targets, and to have the target classification capability using the measured SAR data. The MSL is working closely with ADD to improve our national defense capability in imaging radar area.
  2) EMI; PCB Circuit design and Optimization
- Using the experience in developing layout techniques for PCB with reduced EMI characteristics, we are now designing EBG structures to minimize noise coupling from one section of a PCB to another sensitive sections of the same PCB. If successful, this is expected to have a large industrial and economic impact due to its wide applications since almost all IT equipments use some type of PCB in them and many have similar problems of noise coupling.
  3) Communications; Spectrum Engineering
- Using the spectrum engineering simulator we developed, the MSL is now studying the methods for optimizing various spectrum parameters including the transmit powers for the users in the cell center regions and cell edge regions which would result in the minimum inter-cell interference. We are also proposing a new uplink control signalling scheme to be used in the next generation mobile communication systems. It is expected that the proposed scheme would result in a better system performance than the existing schemes.