标题： 基于新型扫描包络合成方法的宽角扫描异构元件相控阵 显示英文标题

标题： Wide-angle Scanning Heterogeneous Element-Based Phased Array Using Novel Scanning Envelope Synthesis Method

摘要： 提出两种新方法，包括扫描包络综合（SES）方法和有源反射自抵消（ARC）方法，用于设计宽角扫描异质单元相控阵。 异质策略能够有效扩展扫描范围，但定量表征其效果对于指导设计以实现期望性能至关重要。 提出的SES方法从理论上推导出一个相控阵的扫描范围与其模式包络3 dB波束宽度之间的关系，该模式包络是各单元有源辐射图（AEP）幅度的线性叠加。 因此，可以定量分析每种异质性的贡献，从而进一步提高扫描范围。 我们看到，相控阵的高有源反射系数会直接降低实际增益。 为此，提出了一种ARC方法，通过用传输分量抵消有源反射系数中的反射分量来减少有源反射系数，从而即使在阵列在大角度扫描时也能有效地保持实际增益。 为了验证，设计并制造了一个24.5-29.5 GHz的4×4 E面扫描相控阵。 得益于提出的SES方法，原型的扫描范围扩展到$\pm74\deg$，比传统的异质阵列提高了约10{\deg }。 同时，应用ARC方法后，有源反射系数从-4 dB降低到低于-7.5 dB。 显示英文摘要

摘要： Two novel methods, including the scanning envelope synthesis (SES) method and the active reflection self-cancellation (ARC) method, are proposed to design wide-angle scanning heterogeneous element phased arrays. Heterogeneous strategy is efficient to extend scanning range but quantitatively characterization of the effect is critically needed to guide design for achieving desired performance. The proposed SES method derives theoretically the relationship between scanning range and the 3dB-beamwidth of the pattern envelope of one phased array, which is linear superposition of active radiation pattern (AEP) magnitude of each element. Therefore, the contribution of each kind of heterogeneity can be quantitatively analyzed for further enhancing the scanning range. As we see, a high active reflection coefficient of the phased array can directly reduce the realized gain. In this way, one ARC method is proposed to reduce the active reflection coefficient by counteracting the reflection component of active reflection coefficient with its transmission component, thereby keeping the realized gain efficiently even when the array scans at large angels. For verification, one 24.5-29.5GHz 4x4 phased array scanning in E-plane is designed and fabricated. Benefiting from the proposed SES method, the scanning range of the prototype is extended up to $\pm74\deg$, around 10{\deg} improvement over one traditional heterogeneous array. Meanwhile, the active reflection coefficient is reduced from -4dB to lower than -7.5dB by applying the ARC method.