This paper presents concept of wideband log-periodic phase shifter (LPPS) and also three novel microstrip phase shifters using a log-periodic structure for the first time. The process of achieving the goal of wideband releases three main-line models with different characteristics. The design process follows a log-periodic phase shifter theoretical analysis and optimization algorithm of the desired designing platform for circuit tuning. Three proposed main-line log-periodic phase shifters are short-circuited stub LPPS (SS-LPPS), double-sided LPPS (DS-LPPS), and Multilayer coupling LPPS (MC-LPPS). Compact size, planar, ease of fabrication, and wideband are the critical characteristics of the proposed structures. The broadband characteristic of the MC-LPPS is due to top and bottom Log-Periodic microstrip patches broadside coupling of 2 dB through an elliptical slot placed in a ground plane as a middle layer of a structure. Even-odd model analysis of design verification method employed. The optimized overall dimension of the final wideband proposed structure on the low-cost Rogers RO4003C substrate is 35 mm × 20 mm, Fabricated and tested. Experimental and simulation results have good agreement. S₁₁ and S₂₁ are better than −10 and − 1.45 dB in considered 141% fractional bandwidth (1.40-8.11 GHz) for a 130^° continuous phase gradient, respectively.

中文翻译：

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宽带对数周期移相器

本文介绍了宽带对数周期移相器 (LPPS) 的概念以及首次使用对数周期结构的三种新型微带移相器。在实现宽带目标的过程中，发布了三种不同特性的主线模型。设计过程遵循对数周期移相器理论分析和电路调谐所需设计平台的优化算法。三种建议的主线对数周期移相器是短路短线 LPPS (SS-LPPS)、双面 LPPS (DS-LPPS) 和多层耦合 LPPS (MC-LPPS)。紧凑的尺寸、平面、易于制造和宽带是所提出结构的关键特性。MC-LPPS 的宽带特性是由于顶部和底部对数周期微带贴片通过放置在接地平面中作为结构中间层的椭圆槽的 2dB 宽边耦合。采用的设计验证方法的奇偶模型分析。低成本罗杰斯 RO4003C 基板上最终宽带提议结构的优化整体尺寸为 35 毫米 × 20 毫米，制造和测试。实验和仿真结果具有很好的一致性。秒对于 130 ^°连续相位梯度，在考虑的 141% 分数带宽 (1.40-8.11 GHz) 中，₁₁和 S ₂₁分别优于 -10 和 -1.45 dB 。