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This paper presents a new broadband metal-only reflectarray antenna. The designed reflectarray antenna operating at 12.5 GHz doesn't contain any dielectric substrate by using a modified slot structure. The slot-type element is optimized to provide a linear phase curve and a phase-shift range in excess of 360 degrees is achieved. With an offset feed configuration, a 9×9 elements reflectarray antenna...
Reflectarray antennas with different feeding configurations are studied in this paper. A new multi-feeding reflectarray structure aiming at antenna profile reduction is designed and compared with the conventional single-feed reflectarray antenna. The effects of the focus length to diameter of the antenna on the performance of both the multi-feeding and single-feeding reflectarray antennas are investigated...
This paper investigates the allocation of subcarriers and power in the downlink channels of multiuser OFDM systems. The goal is to minimize the total transmit power under the constraints of user data rates and bit error rate (BER). We propose a sub-optimal algorithm to achieve the goal in this paper. We introduce a new factor which is the gain difference between the maximum and the next maximum userspsila...
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