Abstract
This communication presents a dual-band design procedure applied to a very large contoured-beam reflectarray with improved copolar and cross-polarization performances for direct broadcast satellite (DBS) in dual-band dual-linear polarization. The reflectarray is elliptical, with the axes of 1.10 and 1.08 m, and provides coverage for South America in transmit (11.70-12.20 GHz) and receive (13.75-14.25 GHz) bands. The novel dual-band design approach is based on the use of a multiresonant unit cell with several degrees of freedom (DoFs). It is divided into several stages to facilitate convergence toward a broadband high-performance reflectarray. First, a narrowband layout is obtained at the central frequency with a phase-only synthesis. Then, using a limited number of DoFs, a copolar-only optimization is carried out in both frequency bands maximizing the copolar figure of merit. Finally, increasing the number of DoFs, cross-polarization requirements are also included in the optimization procedure. The optimized antenna complies with all copolar and cross-polarization requirements with a loss budget of at least 0.62 dB in both receive and transmit bands, outperforming earlier works in the literature while using a smaller antenna than previously proposed for this mission.
Highlights
R EFLECTARRAY antennas usually exhibit narrow bandwidth which is primarily the result of two factors: the low bandwidth of resonant elements and the differential spatial phase delay [1]
We present a new dual-band design procedure based on a multi-resonant unit cell with up to eight degrees of freedom (DoF) and the generalized intersection approach
A copolar-only dual-band design is carried out with a limited number of DoFs, which are subsequently increased while including cross-polarization requirements as well
Summary
R EFLECTARRAY antennas usually exhibit narrow bandwidth which is primarily the result of two factors: the low bandwidth of resonant elements and the differential spatial phase delay [1]. A copolar-only dual-band design is carried out with a limited number of DoFs, which are subsequently increased while including cross-polarization requirements as well. This guided optimization procedure assists in obtaining a dual-band highperformance reflectarray, which otherwise would be unattainable. It was applied to the design of a 1.10 × 1.08-meters elliptical, transmitreceive reflectarray for space applications in Ku band with a South American coverage in dual-linear polarization with very tight copolar and crosspolar requirements.
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