TOPIC Advanced Antenna Technology for Wireless Communications 
AREA Microwave & RF 
SPEAKER Professor Hiroyuki Arai , Department of Electrical and Computer Engineering,Yokohama National University  
DATE 3 September 2014, Wednesday 
TIME 10:30 pm to 12:00 pm 
VENUE E4-04-07, Engineering Block E4, Faculty of Engineering, NUS 
FEES No Charge 


1) Dual Polarized Wide Band Antenna Fed by Triplate Line for Celluar Base Stations

Wide band antenna elements consisting of a loop slot and double layered parasitic patches are designed for the cellular base station antennas to cover the frequency band of 698 to 960MHz. This antenna is excited by triplate transmission line, eliminating feeding coaxial cables and connectors inside base station antenna. This talk describes the design of this antenna element and array characteristics. N

2) Low-Profile and High-Isolation Orthogonal Dual-Polarization Combined Antenna

A pair of small and low-profile dual-polarization antennas is proposed. Each composite antenna consists of a vertical and a horizontal polarized component element. The two component elements operate at the 2GHz band of IMT-2000,To extend the frequency band width of the horizontal polarization element placed near the ground plane, we use double parasitic strips to obtain dual-band characteristics to cover the uplink and downlink separately. The proposed antennas have been designed to to have a compact and low profile structure with a high isolation.

3) A Closely Spaced Switched Beam Antenna

This talk presents a switched beam antenna consisting of closely spaced two monopoles fed by its optimum amplitude and phase condition to obtain high gain in end-fire direction. The large mutual coupling is reduced by a decoupling circuit, and then a cardioid pattern is switched by selecting feeding port. The decoupling circuit is also replaced by a capacitor to keep the same network condition. This talk also discusses the super-directive condition of this array.



Hiroyuki Arai received the B.E. degree in Electrical and Electronic Engineering, M.E. and;; Physical Electronics from Tokyo Institute of Technology in 1982, 1984 and 1987, respectively. Now he is professor in Department of Electrical and Computer Engineering, Yokohama National University. He was visiting scholar at University of California, Los Angeles in 1997 and was visiting professor in 2005 and adjunct professor, 2012 -2014, respectively, at Yonsei University, Seoul.

He investigated microwave passive components for high power handling applications such as RF p
lasma heating in large Tokamaks. He developed a flat diversity antenna for mobile telephone terminal,a polarization diversity base station antenna for Japanese PDC systems, small base station antennas of In-building micro cellular system and DOA estimation for cellular system.

His current research interest includes MIMO antennas, wireless power transmission, energy harveting in EM waves and EMC/EMI antennas.

He is chair of Technical Group on Antennas and Propagation of IEICE. He is Fellow of IEEE and IEICE.


Jointly organised by IEEE MTT/AP Chapter Singapore and Department of Electrical & Computer Engineering, NUS 

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All are welcome to attend these Seminars. Should you have any enquiries, please contact Ms. Lily Png at 6516 6509 or you can e-mail to Ms Lily Png ().