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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：以前关于可调耦合器的大部分工作都集中在频率和幅度的可调性上。控制相位特性的能力很少引起关注。但是，由于相位的灵活控制会严重影响现代无线通信系统的性能，因此相位可调性变得越来越重要。对此，提出了几种相位可调的耦合器，但是带宽较窄。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。它是通过在两个分支线段之间引入两个装有变容二极管的耦合线段构成的。通过改变负载在耦合线路上和耦合线路之间的电容，可以在两个输出端口之间实现连续可调的相位差，而不会影响相等的功率分配特性。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，制造和测量了工作在1.8 GHz的相位可调耦合器。通过改变两个偏置电压，它在60度到120度之间显示出可调的相位差。同时，仍保持相等的功率分配，良好的回波损耗和高隔离度。期望的特性已在1.6 GHz至2.0 GHz的宽带宽上实现。

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