Construction of multi-port hybrid circuits

1.提出了一种适用于微带线结构的新型八端口混合电路。该电路的一个要点是能够选择任意值的支路阻抗。2. (1)A针对具有1/4波长线段和匹配网络的分支线型八端口混合电路，建立了展宽带宽的设计方法。获得了约20%的相对带宽，并且在同一特定情况下，应当标记带宽上的非常平坦的耦合。（2）虽然不能用匹配网络来展宽，但上述八端口混合电路的带宽对Blanchline阻抗有很强的依赖性，文中给出了16端口和32端口混合电路的结构，并研究了用1/4波长线段来改善其带宽的方法。结果表明，这两种混合电路都实现了相对带宽约为15%的平坦耦合。4.从理论上分析了多端口混合电路散射参数的相位关系，并导出了八端口混合电路散射参数的一般关系。此外，还证明了具有二重对称性的八端口混合电路可以实现同相/反相或四相的输出相位关系。5.作为多端口混合电路的一个应用，提出并详细研究了一个由四个振荡器通过一个八端口混合电路耦合而成的功率合成系统。该系统的特点是将一个组合功率可分配给四个端口中的任意一个端口。

1.It is shown that a novel eight-port hybrid circuit adequate to microstrip line structure can be constructed by utilizing a crossover. A point of this circuit is to be able to choose an arbitrary value for branchline impedances.2.(1)A design method of broadening the bandwidth is established for a branch-line-type eight -port hybrid with 1/4-wavelength line sections and matching networks. A relative bandwidth of about 20% is obtained, and in the same particular a very flat coupling over bandwidth should be marked.(2)The bandwidth of the above nobel eight-port hybrid is strongly dependent on the blanchline impedances, though it can not be widened by matching networks.Constructions of 16- and 32-port hybrids are shown and an improvement on their bandwidth by means of 1/4-wavelength line sections is investigated. As a result, flat couplings over a relative bandswidth of about 15% are realized for the both hybrids.4.A phase relation of the scattering parameters of multi-port hybrids is examined theoretically, and the general relation for eight-port hybrids is derived. Moreover, it is shown that eight-port hybrids with two-fold symmetry can take a output phase relation of inphase/anti-phase or quadrtature.5.As an application of the multi-port hybrid, a power-combinig system of four oscillators coupled through an eight-port hybrid is suggested and studied in detail. The distinction of this system is to deliver a combined power distinguishably to an arbitrary port of four ports.Various multi-port hybrids inclusive of those developed by another investigator are surveyed.