A multibeam adaptive antenna at a basestation can separate spectrally and temporally overlapped signals in a TDMA mobile communication system. Thus, we can achieve space division multiple access (SDMA), which increases the channel capacity. For an uplink channel, weight vectors can be determined by applying a conventional method. In this paper, we consider the weight vectors for a downlink chan...

In this letter, the design of a passive multibeam lens antenna is proposed for CubeSat space communication system as an alternative application 2-D microstrip array that has originally been designed 39-GHz 5G multi-user, multiple-input, multiple-output (MU-MIMO) system. The half-ellipsoid 3-D printed using stereolithography technology. prototype capable selecting main beam between 16 different ...

Abstract In this paper, we propose a novel method for synthesizing multibeam metasurface antenna (MSA) use in space application - payload component of small satellite as part low Earth orbit (LEO) communication constellation. MSA is synthesized using the holographic technique with divergent phase distribution. Using method, low-cost multi-beam Ku-band seven flattened beams developed. The result...

Antenna efficiency is one of the most important figures merit a radio telescope for observations, especially at millimeter wavelengths or shorter wavelengths, even multibeam telescope. To analyze system with beam waveguide, lossless antenna consisting two apertures in series considered frame scalar wave approximation. We found that can be evaluated field distribution over second aperture, and f...

We demonstrate a silicon (Si)-gallium arsenide (GaAs) semiconductor-based holographic metasurface antenna operating at 94 GHz. The molds the radiated beam by resorting to approach involving modulation of guided-mode generated pillbox beamformer. beamformer is fed three integrated horns in substrate-integrated waveguide (SIW) technology located focal plane parabolic reflector correspond independ...

Orthogonality in multibeam antennas is revisited. The difference between orthogonal beamforming and zero-forced highlighted. intriguing relation orthogonality, reciprocity losses recapitulated. Different approaches on the design of networks implementation strategies are shown with various examples from antenna-research-oriented literature. use discussed communication system perspective relevant...

A multibeam antenna with a full azimuthal survey based on cylindrical lens axial symmetry in the form of set layers, each which is metal-dielectric geodesic shell, proposed and investigated. converts fields feeds located circle centered axis plane its base into directed beams same plane. The analysis metal horn was carried out by numerical simulation using finite element method.