Title:
A compact wide-band shorted folded antenna
Author(s):
G. Ruvio and M.J. Ammann
Source:
IEEE International Workshop on Antenna Technology: Small Antennas and Metamaterials
Vol./Issue/Date:
Year:
2006
Page(s):
84 - 87
Keywords:
Abstract:
Planar monopole antennas are easy to construct from a single metal plate and able to offer attractive
performance in terms of impedance bandwidth and radiation properties [1]. However, the necessity of
compactness has induced the research community to investigate folded radiation elements [2 and 3]. But,
at the same time, by reducing the overall dimensions of planar monopole antennas distortions in the
radiation pattern and drawbacks in the impedance bandwidth can be introduced. Special feeding
techniques and particular grounding systems have to be designed in order to obtain an acceptable
compromise between compact dimensions and interesting performance [4, 5 and 6].
The novel and compact wide-band shorted folded antenna presented in this paper offers a working
bandwidth of 4.6GHz between 1.6GHz and 7.2GHz (IBR=4.5;1). Good radiation properties and acceptable
omni-directionality are obtained throughout the operating bandwidth.
The use of a vertical ground plane and a microstrip feeding system permit a dramatic reduction of
dimensions when compared to a planar monopole antenna with same characteristics. In this paper, we
present another promising bandwidth-enhancement technique, which consists of grounding the radiating
element with the vertical ground plane. This solution is shown to only moderately disturb the radiation
properties of the antenna.
As a consequence of performance and reduced dimensions, this antenna represents a significant candidate
for in-door, mobile and vehicular applications where the coverage of different communication protocols is
required.
Numerical simulation have been obtained by CST Microwave Studio and compared to experimental
results of the constructed prototype. A good agreement is achieved.
Document:
Reference Id:
54
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