by Jinwoo Jung and Yeongseog Lim, Chonnam National University Gwangju, Korea; Hyeonjin Lee, Dongkang College, Gwangju, Korea
The United States Federal Communications Commission (FCC) has opened the radio spectrum from 3.1 to 10.6 GHz, permitting the use of a new unlicensed radio transmission technology, the UWB system. UWB systems entail sharp sub-nanosecond pulses, and occupy a wide band with the only restriction being a limit on the radiated emissions levels. The European Commission is following the same road and has been allocating the bands from 3.4 to 9 GHz for UWB systems.1 Several compact UWB antennas have been reported.2-5,7
In this article, a compact planar monopole antenna is proposed for UWB operation. The proposed antenna uses an SMA connector in place of a ground plane. Details of the antenna design and experimental results are presented and discussed.
Antenna Design
Figure 1 shows the geometry of the proposed antenna. The antenna is printed on a FR4 substrate, with a relative permittivity of 4.4 and a thickness of 1.6 mm, and mounted on the square flange of an SMA connector, with a width of 12.7 mm. The antenna consists of three sections: a planar monopole, a microstrip line and an SMA connector.
Figure 1 Geometry of the proposed antenna: (a) top view, (b) SMA connector and (c) sectional view.
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