3-D Bifocal Design Method for Dual-Reflectarray Configurations With Application to Multibeam Satellite Antennas in &lt;italic&gt;Ka&lt;/italic&gt;-Band

Martinez‐de‐Rioja, Eduardo; Encinar, José A.; Florencio, Rafael; Tienda, C.

doi:10.1109/tap.2018.2877298

Cited by 29 publications

(30 citation statements)

References 23 publications

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“…The analysis of the results has shown that the increase of the cross-polar component is mainly produced in the subreflectarray, so an optimization procedure should be applied to the dual-band dual-LP cells to reduce the cross-polarization. Moreover, the use of a dual configuration could be used to implement a bifocal technique to improve the shaping of the beams generated in the edge of the coverage [24].…”

Section: Antenna Farm Based On Two Dual-band Dual Reflectarray Configmentioning

confidence: 99%

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

Martinez‐de‐Rioja

Rodríguez-Vaqueiro

et al. 2020

Sensors

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Broadband communication satellites in Ka-band commonly use four reflector antennas to generate a multispot coverage. In this paper, four different multibeam antenna farms are proposed to generate the complete multispot coverage using only two multibeam reflectarrays, making it possible to halve the number of required antennas onboard the satellite. The proposed solutions include flat and curved reflectarrays with single or dual band operation, the operating principles of which have been experimentally validated. The designed multibeam reflectarrays for each antenna farm have been analyzed to evaluate their agreement with the antenna requirements for real satellite scenarios in Ka-band. The results show that the proposed configurations have the potential to reduce the number of antennas and feed-chains onboard the satellite, from four reflectors to two reflectarrays, enabling a significant reduction in cost, mass, and volume of the payload, which provides a considerable benefit for satellite operators.

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Section: Antenna Farm Based On Two Dual-band Dual Reflectarray Configmentioning

confidence: 99%

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

Martinez‐de‐Rioja

Rodríguez-Vaqueiro

et al. 2020

Sensors

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“…In the recent years, several works have proposed the use of dual reflectarray antennas (DRAAs) for some applications demanding large bandwidth, dual-band operation or beam reconfigurability [14], [24]- [28], thanks to the high flexibility provided by the phase control in two reflective surfaces. The design with flat reflectarrays has some mechanical advantages, related to the compact folding and ease of deployment [26].…”

Section: Two Colors For Both Tx and Rxmentioning

confidence: 99%

“…Bifocal DRAA configurations have been recently proposed as an attractive solution for producing multi-spot coverage from K/Ka-band satellites [27]- [28]. They are able to provide higher gain and C/I levels for the edge beams and to reduce the beam spacing achieved using adjacent feeds with respect to their monofocal counterpart.…”

Section: A Multibeam Draa With Aflat Main Reflectarraymentioning

confidence: 99%

Advanced Multibeam Antenna Configurations Based on Reflectarrays: Providing multispot coverage with a smaller number of apertures for satellite communications in the K and Ka bands

Martinez‐de‐Rioja

Encinar

et al. 2019

IEEE Antennas Propag. Mag.

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This paper presents some recent developments in multiple beam antennas (MBAs) based on reflectarrays for communication satellites in K-and Ka-bands. The existing high throughput satellites commonly employ four reflector antennas to provide cellular coverage formed by multiple spot beams in a four color scheme. Reflectarray antennas are proposed as an attractive solution for the design of novel MBA configurations to produce multi-spot coverage with a smaller number of apertures than conventional MBA systems based on reflector technology. Single and dual reflectarray configurations have been considered for this purpose, exploiting the reflectarrays' ability to produce independent beams in different polarizations and frequencies.

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“…A straightforward approach is based on a feed displacement using a mechanically movable feed to obtain multiple independent beams, the direction of which is determined by the feed position. This solution has been successfully applied to transmitarrays and reflectarrays for space communications [ 14 , 15 , 16 ]. However, when dealing with near-field multi-focusing applications, this type of solution is not used, and published works design transmitarrays, reflectarrays, or metasurfaces using different optimization techniques, which have to include the requirement of each beam in the cost function, therefore increasing the complexity and the computational cost of the design.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a Dielectric-Only Transmitarray for Generating Multi-Focusing Near-Field Spots Using a Cluster of Feeds in the Ka-Band

Vaquero

Pino

Arrebola

et al. 2021

Sensors

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A transmitarray antenna is evaluated to generate a multi-focusing spot area in the Fresnel region of the antenna in the Ka-band. The antenna is designed to focus the radiated field at a certain point using a central feeding configuration. The number of feeds is increased to create as many focusing spots as feeds. The feeds are placed along an arc defined in the principal planes of the transmitarray, radiating independent near-field spots and providing a solution with a wide-angle spot scanning without an antenna displacement and a high isolation between feeds. To validate this concept, a transmitarray based on dielectric-only cells is designed and simulated under full-wave conditions. Then, this design is manufactured using a 3D printing technique, and the prototype is measured in a planar acquisition range. Measurements are performed for different feed positions in order to validate the multi-focusing capability of the antenna. Measurements and simulations show a high agreement and validate the proposed design technique.

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3-D Bifocal Design Method for Dual-Reflectarray Configurations With Application to Multibeam Satellite Antennas in <italic>Ka</italic>-Band

Cited by 29 publications

References 23 publications

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

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

Advanced Multibeam Antenna Configurations Based on Reflectarrays: Providing multispot coverage with a smaller number of apertures for satellite communications in the K and Ka bands

Evaluation of a Dielectric-Only Transmitarray for Generating Multi-Focusing Near-Field Spots Using a Cluster of Feeds in the Ka-Band

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