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Yanggu, South Korea

Yoon Y.-K.,18 Gajeongno | Jung M.-W.,18 Gajeongno | Kim J.,18 Gajeongno
Asia-Pacific Microwave Conference Proceedings, APMC | Year: 2011

This paper proposes an adaptive frequency assignment method and addresses the potential frequency sharing method. The paper investigates a scenario where a block of spectrum is shared between code division multiple access (CDMA) systems with different frequency bands, each with the same time-varying loads. Through simulation, we indicate that the adaptive frequency sharing method has a significant benefit in terms of capacity improvement and seamless service support. © 2011 Engineers Australia. Source


Lee H.,18 Gajeongno | Yun S.,18 Gajeongno | Uhm M.,18 Gajeongno | Yom I.,18 Gajeongno
Electronics Letters | Year: 2015

A novel substrate integrated waveguide to rectangular waveguide (RWG) transition for effective power transfer is proposed. The substrate taper is inserted into a conventional height-stepped impedance transformer of the RWG region to improve transmission loss and bandwidth. The transition is designed to cover the entire K-band (18- 26 GHz), showing a return loss of 20 dB. A back-to-back transition has been fabricated to verify the proposed transition. The experimental results show good agreement with the analysis. The transmission loss of the stand-alone transition is 0.22 dB at 21.7 GHz with a usable bandwidth of 36%. © The Institution of Engineering and Technology 2015. Source

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