Dual Polarized Reflectarray Transmit Antenna for Operation in Ku- and Ka-Bands With Independent Feeds

Abstract

Abstract-A reflectarray antenna capable of operating independently in the transmit frequencies (from a satellite) in and has been proposed and demonstrated. To prove that independent beams can be optimized in each frequency band using separate feeds, a 25-cm demonstrator that generates a focused beam in dual polarization (linear or circular) has been designed, manufactured, and tested. The reflectarray cells comprise two stacked sets of coupled parallel dipoles for each polarization, which permits an independent optimization of the phase for each frequency and polarization. The simulated and measured radiation patterns for both copolar and crosspolar components are in good agreement in Ku-and Ka-bands.

Multibeam Reflectarrays in Ka-Band for Efficient Antenna Farms Onboard Broadband Communication Satellites

“…The flat subreflectarray has a diameter of 0.65 m and it is formed by 11,497 cells disposed in a 117 × 125 grid, considering the same type The operating principles behind this solution have been experimentally validated separately. The design of a dual-band reflectarray with independent operation in dual LP at two separated frequencies can be reached in a direct way, as proposed in [21], by means of reflectarray cells based on orthogonal sets of parallel dipoles for each band. A polarizing reflectarray to convert dual LP into dual CP with broadband operation from 20 to 30 GHz (covering both Tx and Rx bands) has been demonstrated in [22].…”

Analysis and Design of Reflectarray Antennas Based on Delay Lines: A Filter Perspective

“…effects and the influence of the incident angle of the incoming wave to each cell; (ii) gather together slightly different cells to engineer a specific surface phase-profile that implements a desired RA performance; and (iii) evaluate the radiation properties of the entire structure considering the different phase delay between the feeder and the cells. The development of advanced unit-cells exhibiting large phase-shift ranges and intriguing responses -for instance, in terms of polarization [5], multifrequency operation [6], reconfigurability [7], using advanced elements rotation techniques [8], or by integrating SIW antennas as feeders [9]-has undoubtedly driven RAs technology in the last years. The most severe drawback of RA antennas is arguably their narrow operational bandwidth, which is determined by the resonant response of their composing unit-cells and the different phase delay between such cells and the feeder [1].…”

Design and fabrication of a novel single-layer Ka-band reflectarray antenna

“…One of the main characteristics of reflectarray antennas is that they can be designed to work at multiple frequency bands, either using a single-layer [3–9] or a stacked multi-layer configuration [10–14]. Single-layer reflectarrays offer a reduced manufacturing cost; however, the physical distance between the unit-cell elements used for each frequency band may seem a design problem, since the mutual coupling between the elements must be accurately taken into account and physical interference must be avoided [1, 5].…”

“…In the case of dual-band reflectarrays based on several stacked layers, the restriction of this method is that cells with identical period are applied for both frequency bands, and as a result, the maximum ratio between the two frequencies is limited [13]. Thus, a reflectarray antenna can be designed for transmit and receive at two different frequencies, either using a feed with dual-frequency characteristic [7] or applying separate feeds for each frequency band [10]. In both cases, the reflectarray can be designed to work in dual polarization [4, 7, 10].…”