C-Band Multiple Beam Antennas for Communication Satellites

Montero, José M.; Ocampo, Ana M.; Fonseca, Nelson J. G.

doi:10.1109/tap.2015.2395444

Cited by 48 publications

(21 citation statements)

References 13 publications

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“…are generated with minimal SLL in both channels whose main lobe angles are in great agreement with the theoretical predictions based on Eq. (7). The gain of the main lobe in the 2nd channel is lower compared to that in the 1st channel despite the equal size of the sub-arrays which is due to fact that the generated beam in the 2nd channel is further from the broadside being in accordance with the results of study presented in Fig.…”

Section: Beam-steering In Two Planessupporting

confidence: 87%

“…Several different techniques have been adopted previously for development of multibeam patterns across different frequency spectra including utilization of phased array antennas [5]- [7], graded metamaterials based on transformation optics [8]- [10], zero refractive index metamaterials [11], [12], lenses [13]- [16], and metasurfaces [17]- [25]. Among these approaches, metasurfaces consisting of a planar twodimensional ensemble of subwavelength unit cells are of particular interest for on-chip devices and applications where the size and weight are highly constrained due to their small form factor and fabrication feasibility.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Multichannel Terahertz Communication by Space-Time Shared Aperture Metasurfaces

2020

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We propose a technique for adaptive multichannel communication in the low-terahertz frequency regime through simultaneous and independent multifrequency multibeam scanning via a single time-modulated metasurface consisting of graphene micro-patch antennas whose Fermi energy levels are modulated by radio-frequency biasing signals. For this purpose, we divide the metasurface aperture into interleaved orthogonally modulated sub-array antennas with distinct modulation frequencies, rendering a shared aperture in space-time. The higher-order frequency harmonics generated by the sub-arrays in such a space-time shared-aperture metasurface are mutually orthogonal as they do not yield an observable interference pattern. A distinct constant progressive modulation phase delay can be adopted in each sub-array to independently scan its corresponding higher-order frequency harmonics via dispersionless modulationinduced phase gradient with minimal sidelobe level and full angle-of-view over a wide bandwidth. The number of sub-arrays and distinct channels can be scaled easily without suffering from cross-talk due to orthogonality of the channels. The concept is established theoretically and verified through numerical simulations. We characterize active beam-scanning performance of the space-time shared aperture metasurface in terms of gain and half power beamwidth and their dependence to the array architecture. We consider both one-dimensional and two-dimensional interleaving for scanning the beams along elevation and azimuth angles. We also obtain the upper bounds for the number of independent channels attainable without compromising angle-of-view as 8 and 64 for one-dimensional and two-dimensional interleaving, respectively within the same physical aperture. Our results point toward high-capacity platforms with low size, weight and power for next generations of terahertz communication systems. INDEX TERMS Time-modulated metasurface, shared-aperture antennas, beam steering, terahertz communication

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Section: Beam-steering In Two Planessupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Adaptive Multichannel Terahertz Communication by Space-Time Shared Aperture Metasurfaces

2020

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“…The base‐station antennas are commonly linear arrays that provide a fan‐shaped beam, wide enough to cover the azimuth width of a sector and narrow in the elevation plane to increase the directivity and thus the link budget 1,2 . In the case of satellite communications, multi‐beam antennas generate several spots on the Earth to provide service to different regions 3,4 . In this case, reflectors with different feeders are used to generate very high directivity pencil beams in order to overcome high propagation losses.…”

Section: Introductionmentioning

confidence: 99%

Low‐costlens antenna for5Gmulti‐beam communication

García-Marín

Filipović

Masa‐Campos

et al. 2020

Micro & Optical Tech Letters

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A planar dielectric lens has been designed for low‐cost multi‐beam antennas in the 26‐GHz band of 5G communications. The lens feeder is a stacked‐patch microstrip antenna with four input ports, thus permitting four independent high‐directivity radiation beams. Maximum steering of 25° can be attained, which a simulated gain over 18 dB for all scanning angles. The antenna has been implemented with low‐cost manufacturing techniques. The feeder is fabricated as a printed circuit board, while the lens is realized as a perforated 3D‐printed dielectric piece. Experimental results confirm the multi‐beam capability of the lens system, suggesting that the spillover efficiency can be improved in further works.

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“…Large-scale spaceborne phased arrays are one of the most important enabling techniques for future high-capacity satellite communications [1]- [3]. To deploy high gain beams over targeting areas while maintaining sufficient attenuation elsewhere [3], the amplitude & phase relationship among the array elements must be under full control of the beamformer.…”

Section: Introductionmentioning

confidence: 99%

NOMA-Based Calibration for Large-Scale Spaceborne Antenna Arrays

Lin

Wang

et al. 2018

IEEE Trans. Veh. Technol.

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Abstract-In the parallel calibration for transmitting phased arrays, the calibration receiver must separate the signals belonging to different antenna elements to avoid mutual interference. Existing algorithms encode different antenna elements' radiation with orthogonal signature codes, but these algorithms are far from desired for large-scale spaceborne antenna arrays. Considering the strictly limited resources on satellites, to improve hardware efficiency of large-scale spaceborne antenna arrays, in this work inspired by the idea of non-orthogonal multiple access (NOMA) we design a series of non-orthogonal signature codes for different antenna elements by Cyclically Shifting an m-Sequence (CSmS) with different offsets named as CSmS-NOMA signaling. This design can strike an elegant balance between the performance and complexity and is very suitable for large-scale spaceborne antenna arrays. It is shown that no matter how many antenna elements there are to be calibrated simultaneously, CSmS-NOMA signaling needs only one calibrating waveform generator and one matched filter. Hence it is much more efficient than the existing fully orthogonal schemes. In order to evaluate the achievable calibration accuracy, a unified theoretical framework is developed based on which the relationship between calibration accuracy and signal to noise ratio (SNR) has been clearly revealed. Furthermore, a hardware experiment platform is also built to assess the theoretical work. For all the considered scenarios, it can be concluded that the theoretical, simulated and experimental results coincide with each other perfectly.

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C-Band Multiple Beam Antennas for Communication Satellites

Cited by 48 publications

References 13 publications

Adaptive Multichannel Terahertz Communication by Space-Time Shared Aperture Metasurfaces

Adaptive Multichannel Terahertz Communication by Space-Time Shared Aperture Metasurfaces

Low‐costlens antenna for5Gmulti‐beam communication

NOMA-Based Calibration for Large-Scale Spaceborne Antenna Arrays

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