Lumped-element structures of basic microwave components for large-scale MMIC applications

1.提出了一种基于不变量和等效导纳的具有双反射或单反射对称的无损互易四端口电路的系统设计思想。(2)解析地推导了由非平衡线LC电路和平衡线LC电路组成的各种混合器的频率特性。一般而言，平衡线混合电路具有更宽的频带特性，而正交混合电路的带宽是非平衡电路混合电路的两倍。此外，平衡线180度混合电源具有3.2的宽带比。分析了导体损耗对电感性能的影响。(3)提出了一种新型的宽带180度逆变器混合电源。在考虑了电感损耗的情况下，计算了频率的依赖关系。(4)提出了一种超小型化、带宽相当宽的半集总元件混合环。(5)在砷化镓衬底上实现了上述混合环，并用电磁模拟器(Sonnet)验证了设计方法的有效性。(6)对加宽的正交混合环进行了实验验证。8端口混合器(1)通过适当连接四个正交混合器提出了各种结构，并阐述了两种宽带类型。(2)描述了一种带宽展宽技术。威尔金森功分器：(1)对集总元件结构的频率特性进行了解析推导。(2)利用电磁模拟器对其版图及其频率特性进行了仿真。未来课题(1)新型多端口功分器和N路Wilkinson功分器的研制。(2)降低导线损耗的研究。(3)可变衰减器和移相器等功能器件的研制。

1. Quadrature and 180-degree 3 dB hybrids(1) The research presents a systematic design concept based on the invariant and the equivalent admittance for lossless reciprocal 4-port circuits with double or single reflection symmetry.(2) The research derives the frequency characteristics of various hybrids consisting of unbalanced or balanced line LC circuits analytically. Generally, balanced line hybrids exhibit a broader-band property, and the bandwidth of a quadrature hybrid is twice as wide as that of an unbalanced line hybrid. Additionally, a balanced line 180-degree hybrid possesses a wide bandwidth ratio of 3.2. The effect of conductor loss in inductors also is examined.(3) A new broadband 180-degree hybrid with a phase inverter is proposed. The frequency dependencies are calculated with consideration for the loss of inductors.(4) An exceedingly miniaturized semi-lumped-element hybrid ring with a considerably broad bandwidth is newly proposed using a phase inverter and shunt capacitors added at each port.(5) The above hybrids are virtually realized on a GaAs substrate, and the validity of the design technique is demonstrated by an electromagnetic simulator (Sonnet).(6) Experimental confirmation is shown for a broadened quadrature hybrid.2. Eight-port hybrids(1) Various structures are proposed by appropriately connecting four quadrature hybrids, and two typed with a broad bandwidth are elaborated.(2) A band-broadening technique is described.3. Wilkinson power divider(1) The frequency characteristics of a lumped-element construction are derived analytically.(2) The layout and its frequency properties are shown by and electromagnetic simulator.4. Future subjects(1) Development of a new multi-port power divider and N-way Wilkinson power divider.(2) Investigation on decrease of the conductor loss.(3) Development of functional devices such as a variable attenuator and a phase shifter.