This letter presents a polarization reconfigurable compact slot antenna with reduced radar cross section (RCS) using an asymmetric cross-shaped metasurface (MS). The proposed MS can reconfigure the polarization of the slot antenna between right hand circular polarization (RHCP), left hand circular polarization (LHCP) and linear polarization (LP) by rotating it with respect to the centre of the slot antenna. In addition, the MS reduces the RCS of the slot antenna significantly in all polarization states. The cross slot MS is placed just over the planar slot antenna without any air gap. The simulated monostatic RCS of -19.5 dBsm is observed at 4.4 GHz for LHCP and RHCP case and -17.0 dBsm for LP mode of operation. Antenna performance in terms of its input matching, far-field parameters, monostatic RCS and axial ratio are measured at its three polarization states, which are in agreement with simulated results.

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A simple novel compact wideband directive metasurface (MS) enabled antenna is proposed. Two same dimensions of edge fed slots are used to excite the MS layer which is made of a periodic arrangement of a rectangular loop-based unit cell. An optimised resonant slot fed at the edge with a simple micro-strip line together with the epsilon very large MS layer exhibits wideband behaviour. The antenna yields a bandwidth from 5.89 to 6.6 GHz for a voltage standing wave ratio < 2 (12%) compared with a measured fractional bandwidth of 14%. A maximum broadside directivity of 10.5 dBi has been achieved. Simulated efficiency is more than 87%. The measurements characteristics of this antenna are in agreement with simulated results.Introduction: With the advent of modern wireless devices, compact wideband directive antennas have attracted much attention. In recent years, many meta-surface (MS)-based antennas have been proposed for polarisation and frequency reconfigurability [1][2][3][4]. In [5,6], wide-band slot antennas are presented, which have a very large ground plane around the slot and also the cross-polarisation level variation over the frequency band is greater. In [7], an off centred microstrip fed wideband pair of slot antennas is presented. A complex feeding structure is used for obtaining good matching over the wideband but the gain of the antenna is low and the radiation pattern is bidirectional. In this Letter, a novel wideband MS antenna fed by two same size edge fed slots is presented with a simplified feeding structure with good broadside directivity. The epsilon very large (MS layer) loading not only helps to provide good matching over the bandwidth but also provides a unidirectional radiation pattern with a broadside directivity of about 10 dBi as described in [8]. To maintain the low profile, the MS layer is placed on top of the edge fed slot layer. The antenna ground plane area is small at 1.22 l 2 0 . The proposed antenna gives a fractional bandwidth (FBW) of 14% which is higher than given in [1][2][3]. This antenna gives a maximum gain of 9.4 dB, which is more than almost 5 dB as compared with that reported in [7]. The average front to back lobe ratio is 7 dB over the bandwidth.

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