چکیده

A reflectarray antenna is demonstrated which can operate at X-band as a Local Multipoint Distribution Service (LMDS) base station antenna. The configuration consists of a center-fed single layer reflectarray consisting of 23×27 elements. The unit cell of the reflectarray has linear polarization with more than 400° linear phase shift. The geometrical parameters of the unit cell have been optimized to increase the bandwidth and achieve lower cross polarization (XP) level for the reflectarray. A design procedure valid for obtaining any arbitrary pattern has been implemented. In this procedure to achieve a specified radiation pattern over a desired frequency range a phase-related synthesis method is applied to obtain required phase shift on the reflectarray surface. The method has been successfully applied to a LMDS base station antenna characterized by a sectorial cosecant squared beam in the frequency range of 9.4 GHz - 11.5 GHz. The simulation results are in a good agreement with the design requirements. The antenna has cosecant squared pattern over the bandwidth of 21% XP level better than -30 dB and SLL less than -20 dB in both elevation and azimuth planes. Also the 23×27-element array size is 246×289 mm2 which its 1dB gain bandwidth is higher than 19%.

کليدواژه ها

Beam shaping reflectarray Microstrip patch LMDS base station Antenna Cosecant squared pattern

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رضا معصومی , 1400 , فرآیند طراحی یک آنتن آرایه بازتابی جدید برای ایستگاه مرکزی LMDS , پنجمین کنفرانس مهندسی مخابرات ایران