tailieunhanh - Satellite Communicationsever increasing widespread Part 12

Tham khảo tài liệu 'satellite communicationsever increasing widespread part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 376 Satellite Communications absorbed by a matching network or reflected back to be reradiated in phase. Corporate feed arrays also called parallel feed arrays are more versatile and the designer has more control of the phase and amplitude of each feeding element making them ideal for scanning phased arrays multibeam arrays or shaped-beam arrays. Fig. 4. Parallel feed configuration for microstrip arrays. After Lee 1997 Fig. 4 shows how the patches are feeding by power division lines. Transmission lines divides into two branches and each branch divides again until it reaches the patch elements. For a broadside array all the divided lines are of the same length. A disadvantage of parallel feeding is that the insertion loss is higher than that of a series feeding however is less affected by phase changes due frequency changes because relative phases between all elements will remain the same. The corporate feed array can achieve a bandwidth of 15 or more depending on the design. Fig. 5. Series-Parallel feed configuration for microstrip arrays. After Lee 1997 The hybrid series parallel array is shown in Fig. 5 where a combination of series and parallel feed lines are used feeding elements in this way is possible to have a wider bandwidth than the series feed array but with a higher insertion loss due the parallel feeding but the technique allows to make design trade-offs between bandwidth and insertion loss. A microstrip can be designed in a single layer or multilayer configuration decision is related with complexity and cost sidelobes cross polarization bandwidth and other factors. Using a single layer reduces manufacturing costs but other characteristics are degraded. When low sidelobe or cross polarization is needed the double layer design seems to be the better choice. Fig. 6 shows a multilayer of a dual polarization antenna where the antenna feeding is obtained with crossed slots on the ground plane and the feeding of the two polarizations is obtained using two .

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