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Broadband Loaded Cylindrical Monopole Antenna


Ahstract-A broadband printed monopole antenna based on the variation of the conductivity along its length is proposed .. The result indicates that a non-monotonous repartition provides interesting performances in terms of impedance bandwidth but also concerning antenna gain. The achievement of the method is demonstrated through its application, using the carbon fibers to perform this conductivity variation. Monopole antenna presents a large impedance bandwidth of 123% with an interesting gain. Measurement and simulation present a good agreement. I. I N T R O D U C T I O N With the rapid development of communication standards, wide band antennas are needed. Several authors have suggested widening monopole antenna bandwidth by resistive loading continually [1,2]. This kind of resistive distribution leads to a very wide bandwidth but damages significantly antenna gain and its efficiency becomes very low. Antenna characteristics could be improved by modifying the resistive profile. In this paper, we propose to use a variable conductivity along the antenna length applying an optimized profile which gives a broadband impedance bandwidth, a stable radiation pattern, a stable gain level over a large bandwidth especially in the horizontal plane and a higher radiation efficiency. The values of conductivity used is achieved by using various materials such as copper and specially carbon fibers fo r which we can easily tune its conductivity by modifying the concentration of carbon nanofibers [3]. The main aim is to find a compromise between a large impedance bandwidth at -5 dB of reflection coefficient and a good efficiency. So, a new broadband monopole antenna is presented working in the VHF-UHF band. Simulation results and measurements are presented in order to illustrate the characteristics of the proposed antenna.
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hal-01119719 , version 1 (23-02-2015)


  • HAL Id : hal-01119719 , version 1


Solene Boucher, Ala Sharaiha, Patrick Potier. Broadband Loaded Cylindrical Monopole Antenna. Proceedings of the International Symposium on Antennas & Propagation (ISAP), 2013, Oct 2013, Nanjing, China. ⟨hal-01119719⟩
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