2 research outputs found

    Multiport beamforming system based on reconfigurable waveguide phased antenna array for satellite communication applications

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    A multiport K/Ka-band beamforming system based on the reconfigurable waveguide phased antenna array is presented in this thesis. The waveguide structure is used to achieve low loss, wideband performance, and simple installation and maintenance. The antenna array is adopted to compensate for the high propagation loss in higher frequency, which also provided flexible functions for multi-user wireless communication applications. The reconfigurable waveguide transitions are the most crucial component in this beamforming system to achieve dual linear-polarized/left-handed circular-polarized/right-handed circular-polarized functions at K/Ka-band respectively by using the reconfigurable structure. It provided much better performance in bandwidth compared with the recent dual-band/dual-mode waveguide transitions. The waveguide antenna and antenna arrays are reconfigurable and replaceable to meet the design purposes and requirements for linear-polarized/left-handed circular-polarized/right-handed circular-polarized functions. The ultra-bandwidth from K-band to Ka-band provided advantages in saving cost and flexible functions due to the waveguide antenna array parts being applicable for both transmitting/receiving systems for K/Ka-band. This advanced beamforming system could provide many merits such as low loss, wideband, compact structure, high functional flexibility, lower cost, simpler installation, and easier maintenance by using the waveguide reconfigurable. These advantages are indicated by the sufficiently good performance in both the simulated and measured results in this thesis, which demonstrated that this beamforming system design is applicable for wireless communication applications in high frequency, especially for satellite communication applications with separated unlink and downlink systems. The potential and prospect for a MIMO beamforming system with a multilayer PCB feeding network are also demonstrated from the wideband performance of multilayer SICL power divider and SICL-to-waveguide transitions in this thesis to get a more flexible structure for a MIMO beamforming system and more compact structure
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