The design and simulation of a 10 × 8 multibeam dual-band orthogonal linearly polarized antenna array operating at Ku-band are presented for transmit-receive applications. By using patches with different coupling methods as elements, both perpendicular polarization in 12.25–12.75 GHz band and horizontal polarization in 14.0–14.5 GHz band are realized in a shared antenna aperture. A microstrip Rotman lens is employed as the beamforming network with 7 input ports, which can generate a corresponding number of beams to cover −30°–30° with 5 dB beamwidth along one dimension. This type of multibeam orthogonal linearly polarized planar antenna is a good candidate for satellite communication (SatCom).
Abstract. In this paper, a novel hybrid structure of reflectarray with dielectric cylinder, metallic cylinder and metallic ground is designed. This structure can generate a pencil beam in a desired direction by adjusting its phase appropriately with its 1-dB gain bandwidth achieving 22.56%. Moreover, radiation patterns of the structure at different frequencies are in good consistency.
Abstract. In this paper, a design for wideband and low cross polarization slot antenna at X band is presented. By adopting the double-layer slots and strip-line structure, the proposed antenna obtains a good characteristic of wide band. And unidirectional radiation is achieved by adding a planar reflector. In order to solve the weakness of high cross polarization and pattern distortion for wide slot antenna, an antiphase balanced feed network is introduced. Simulation results proved that the proposed antenna lowers the cross polarization level (XPL) while maintaining a bandwidth of 46.3% from 7.5GHz to 12.5GHz. The largest XPL in the range of half-power angle is -20dB. And the gain is 8.4dBi to 9.5dBi within the operating band.
In order to lengthen floating time of foil in the air and improve its scattering abilities, this paper proposes a novel structure of millimeter wave foil. By cutting useless part of foil, its weight is reduced appropriately while its scattering properties as well as floating time are strengthened which usually means effective interference.
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