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Abstract_ In this paper we introduce a new compact dualpolarized circular slot antenna fed by two orthogonal CPW semidiscs. In order to achieve a good performance in terms of bandwidth and isolation, several techniques are used. To examine the antenna performances, numerical simulations using CST software were carried out. The obtained results show that the proposed antenna has good matching and isolation lower than20dB over a broad-band of frequency from 3GHz to 14GHz. These features make the proposed antenna very attractive for UWB applications using polarization-diversity technique.

In this paper, we present the design of a new ultra-wideband (UWB) frequency selective surface (FSS) based antenna, by using a wide stop-band FSS as a backing reflector for an UWB monopole antenna. A new single layer FSS, with UWB stop-band response and a reflection phase varies linearly with frequency, is firstly designed and thereafter, it is integrated with an UWB electric monopole. The studies of the behavior of the proposed antenna reveal that a unidirectional radiation with a quasi-constant gain of an average of 9dBi and a compact profile of λ/10 are achieved. The features of the proposed UWB FSS and its based antenna make them good candidates for integration with low profile broadband printed circuits and UWB applications.

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In this letter, a technique to improve the gain of ultra-wideband (UWB) planar antennas, by using low-profile frequency selective surface (FSS) based reflectors, is proposed. This technique not only enhances the gain of the planar UWB antennas but also guarantees a constant gain of maximum variation of 0.5 dB across the entire UWB, while keeping their attractive merits. To prove the effectiveness of the proposed technique, UWB coplanar waveguide (CPW) fed circular-disc antenna is installed above the proposed reflectors. As result, constant gain UWB antenna has been obtained.

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