Nan Ni, EE Faculty candidate 

 

Friday, April 7, 2006 - 11:00-12:00

Presentation to the College and campus, 302 EMCS 

 

Abstract:

Ultra-Wideband (UWB) communication systems have been the subject of
intense research over the last few years because they present an
alternative physical layer to indoor wireless systems. Recently, The
Federal Communication Commission has secured the frequency range of
3.1-10.6GHz for UWB, which has a bandwidth ratio (defined as higher
frequency versus lower frequency) of approximately 3.3:1. The essence of
such communication link is the ability to send out and receive
Ultra-Short-Pulse (USP). Having this in mind, it is critical to develop
an antenna, which maintains a good phase and amplitude linearity over a
wide bandwidth. Broadband antennas have been studied for short pulse
applications. Little effort has been invested in antenna array for
short-pulse applications. We presented a new dipole array concept,
called Independently Center-fed Dipole Array (ICDA) for the UWB
applications. We firstly proved the feasibility of such concept by
treating the case of two elements. Then we presented a multi-element
ICDA for UWB communication systems in order to prove that ICDA is
capable of covering the entire UWB bandwidth even by using narrowband
dipoles as radiation elements. By using FDTD, we show that the workable
frequency range of the multi-element ICDA is the sum of its elements.
The transmission coefficient is linear, for the concern of amplitude and
phase, from 3.1GHz to 10.6GHz. Finally, based on its efficiency
characteristic, we designed a 2-element ICDA antenna by employing
broadband elements. Extensive simulations were conducted to characterize
the antenna in terms of transmission coefficient S21, radiation pattern
and time-domain comparison. The array exhibits linear amplitude and
phase in the frequency range of 2.6-11.8 GHz, broader than the allocated
UWB frequency range of 3.1-10.6 GHz.

 

 

Paula Klintworth , CPS, Administrative Specialist I
Computer Science - 313 EMCS - Dept. 2302
The Univ. of  TN at Chattanooga
615 McCallie Avenue
Chattanooga, TN 37403-2598
e-mail:  [log in to unmask]
phone:  (423) 425-4349 
fax:  (423) 425-5442

 


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