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Design of Wideband Small Antenna for UWB Communication  

Ko Ji-Whan (School of Electronic Eng., Kumoh National University of Technology)
Shin In-Ho (School of Electronic and Electrical Engineering and Computer Science, Kyungpook National University)
Lee Young-Soon (School of Electronic Eng., Kumoh National University of Technology)
Cho Young-Ki (School of Electronic and Electrical Engineering and Computer Science, Kyungpook National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.11, 2005 , pp. 1086-1098 More about this Journal
Abstract
Two types of small wideband antennas are proposed for UWB application. One type is small biconical structure fed by coaxial probe, which is easy to be installed on the circuit board. The other type is of planar bow-tie type fed by coplanar transmission line. Generally, the bandwidth of the latter type is significantly narrower than that of the former type. It is shown, however that the bandwidth of the latter type can be made to be comparable to that of the former, if some series inductive component is introduced in the center conductor line in the CPW transmission line by replacing some part of center line with narrower line of higher characteristic impedance. The series inductance component play an important role of neutralizing the capacitive component of the small bow-tie antenna, thereby making broadband impedance matching possible. The small planar bow-tie antenna was fabricated and experimented. The experimental results for return loss are observed to be in good agreement with simulated results. The radiation pattern is also investigated experimentally.
Keywords
UWB; Ultra Wideband Antenna;
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