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The design of an X-band circularly polarized reconfigurable reflectarray antenna is presented. Elements with concentric dual split rings are mechanically rotated by micromotors to achieve phase reconfigurability with low cross-polarization and low element loss. Simulation results show that a maximum gain of 26.43 dB with aperture efficiency of 62.9% is achieved by a reflectarray with 15×15 elements...
We consider data-streaming from an access point to multiple receivers, which is modeled as packet erasure channel. A simple network coding is shown to achieve larger rate region than without network coding, using minimal control information. The performance is characterized exactly using state transition graph. The scheme is then mapped to an information theoretic formulation for broadcast channel...
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