Circularly Polarized Reflectarray With Microstrip Ring Elements Having Variable Rotation Angles

A Novel Bandwidth Enhancement Technique for X-Band Rf Mems Actuated Reconfigurable Reflectarray

“…Various methods have been introduced for synthesis of FBRAs microstrip elements, such as: With elements of the same shape and size which are loaded with stubs of different size [4], with elements of the same shape but different lengths [5], with elements of the same shape having slots of different size on the patch [6], with elements of the same shape and slots of different size on the ground plane [7], with loaded elements that their rotation angle is changed with stubs of circular polarization [8], with slot ring resonator elements [9], with ring resonator elements [10], with folded reflectarray elements [11], . .…”

The Generalized Direct Optimization Technique for Printed Reflectarrays

“…In this design (Design B), a right hand circularly polarized (RHCP) reflectarray that radiates a high-gain beam on the European coverage area in the frequency range is realized by utilizing the variable rotation technique (VRT) [10], [11]. The VRT uses identical array elements with different angular rotations to achieve a given far-field beam.…”

“…To obtain a specific far-field pattern with a printed reflectarray, several degrees of freedom can be used, e.g., the size [4], [5], the shape [6]- [9], the orientation [10], [11], and the position [12], [13] of the array elements. An accurate and efficient design procedure, capable of including all these parameters, is a challenging task.…”

Ka-Band Low Profile Circularly Polarized Reflectarray

“…So, a variety of CP reflectarrays have been proposed in the literature using LP feeder [2][3][4][5][6][7][8] and CP feeder [9][10][11][12][13][14][15]. A reflectarrays using linearly polarized feed can be used where its polarization runs parallel to the diagonal line of the square cell element by tilting the feed by 45 • , and its linearly polarized field is decomposed into two equal components along the sides of the square cell.…”

“…The element rotation technique for designing CP reflectarray was first reported by Huang and Pogorzelski [9], where the patch element is connected with two orthogonal microstrip delay lines of different lengths. Later, an element of the split ring structure was developed by Han et al [10] and Strassner et al [11] for simplifying the CP element structure. The reversal of polarization due to the ground plane is canceled out by the presence of these CP elements, and an element rotation of ∆Φ results in a 2∆Φ phase delay of the backscattering.…”