Moufida Bouslama

Beam-Switching Antenna With a New Reconfigurable Frequency Selective Surface

In this letter, a design of a beam-sweeping antenna using a new active frequency selective surface (FSS) is presented. The active FSS is composed of a steerable hybrid element that allows the control of radiation characteristics of the proposed antenna. The design is composed of an active cylindrical FSS structure containing PIN diodes and is divided into 10 equal columns. This design contains a simple dipole that is located in the center and surrounded by a cylindrical active FSS. The beam-sweeping of the antenna is produced by switching the PIN diodes between the on and off states. The antenna operates at 1.8 GHz and covers all azimuth angles in 10 steps with a maximum measured gain of 9.1 dBi. This beam-switching antenna can be used in the base stations of wireless communication systems.

Reconfigurable dual-band 3D Frequency Selective Surface unit-cell

A novel Frequency Selective Surface composed of the intersection of the combination between a cone-shaped structure and rectangle is presented. The proposed 3D Frequency Selective Surface contains high frequency PIN Diodes which allow the reconfiguration of the transmission and reflection coefficients of the electromagnetic window in two frequencies bands of 1.45 GHz and 2.45 GHz. The design results obtained from the CST simulation software show that the proposed 3D-FSS can provide a reconfigurable frequency for the unit cell which can be used in electromagnetic switched beam antennas or in building applications.

A new FSS superstrate structure for antenna performance enhancement

A high gain resonant cavity antenna using a new Frequency Selective Surface (FSS) superstrate is presented. In the proposed design, the simple superstrate is composed of two different dielectric slabs with different material proprieties and thicknesses, both are arranged to be highly reflective to achieve gain and directivity enhancement. Furthermore, the Software CST Microwave Studio is used to extract the directivity and the radiation pattern of the FSS resonator design. The proposed antenna using a single probe feeds is designed to operate at 5.8-6.2 GHz region. The measurement results are included for supporting the modelings and simulations.

Enhanced radiation characteristics for antipodal Vivaldi antenna using high permittivity dielectric director

In this paper, we investigate the influence of higher permittivity dielectric director on the radiation performances of an antipodal Vivaldi antenna. An elliptical dielectric director with high per...

Reconfigurable radiation pattern antenna based on a new active frequency selective surface

In this paper, a reconfigurable antenna beam switching based on a new frequency selective surface is presented. The new unit cell used for this antenna is a combination of strip and six typical square loops. The simulation results show that the antenna produces a gain of 9.8 dBi at an operating frequency of 2.4 GHz. The antenna can scan the entire azimuth plane with 36° wide beam radiation in ten steps.

Reconfigurable dual band filter using new frequency selective surface

In this paper, a reconfigurable frequency selective surface is proposed to control the transmission/reflection of the incident EM waves. A novel FSS unit cell contains a strip and ten typical square loops united together to create a dual stop band response. Besides, a PIN-diode is incorporated to alter the transmission/reflection coefficients. The proposed reconfigurable FSS unit cell provides a dual-band response centered at 2.25 GHz and 4.2 GHz. Therefore, the design can be used in S-band shielding applications.

Reconfigurable new unit-cell frequency selective surface for beam switching applications

In this paper, we present a novel Reconfigurable Frequency-Selective Surface (RFSS) design intended to improve the performance of filtering property. An FSS hybrid element is made reconfigurable through the use of a high frequency switch PIN diode. Our focus will be on the design of FSS structures whose transmission coefficient has acquired a dual-band of the desired frequencies. The RFSS hybrid element is composed of ten rings and a single dipole combined together to create two bands. The PIN-diode is also included in the structure to constitute a reconfigurable response of the electromagnetic window in two frequency bands of 2.3 GHz and 3.7 GHz. These dual bands are available for IEEE 802.16 WiMAX Applications. The impact of hybrid element, which is simulated by CST microwave studio software, has produced a reconfigurable transmission and reflection coefficient.