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A phase tunable hybrid coupler with enhanced bandwidth

机译：具有增强带宽的相位可调混合耦合器

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摘要

The majority of the previous works on tunable coupler concentrates on the tunability of the frequency and amplitude. The capability to control the phase characteristics draws little attention. However, the tunability in phase becomes more and more important, as the flexible control in phase affects the performance significantly in the modern wireless communication systems. Regarding this, several phase tunable couplers were proposed but with narrow bandwidth. In this article, a novel phase-tunable coupler with enhanced bandwidth is proposed. It is constructed by introducing two varactor loaded coupled line sections between two branch line sections. By varying the capacitances loaded on and between the coupled lines, the continuously tunable phase difference can be achieved between two output ports without affecting the equal power division characteristics. The analysis of the ideal model and detailed circuit has been conducted to obtain the design formulas and guidelines. For demonstration, a phase tunable coupler operating at 1.8 GHz was designed, fabricated, and measured. It exhibits a tunable phase difference from 60 degrees to 120 degrees by varying the two biasing voltages. Meanwhile, the equal power division, good return loss, and high isolation are still maintained. The desired characteristics have been implemented over a wide bandwidth from 1.6 GHz to 2.0 GHz.
机译：以前的大部分工作在可调耦合器上专注于频率和幅度的可调性。控制相位特征的能力很少注意。然而，随着阶段的灵活控制在现代无线通信系统中的灵活控制中，相位的可调性变得越来越重要。关于此，提出了几个相位可调耦合器，但具有窄的带宽。在本文中，提出了一种具有增强带宽的新型相位可调耦合器。它通过在两个分支线部分之间引入两个变容负载耦合线部分来构造。通过改变耦合线上和之间的电容，可以在两个输出端口之间实现连续可调的相位差而不影响等功率分割特性。已经进行了理想模型和详细电路的分析以获得设计公式和指南。为了演示，设计，制造和测量以1.8GHz工作的相位可调耦合器。它通过改变两个偏置电压，它从60度到120度表现出可调谐相位差。同时，仍然保持相同的电力分割，良好的回报损失和高隔离。所需的特性已经在1.6 GHz到2.0 GHz的宽带上实现。

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