Continuously tunable impedance matching network using ferroelectric varactors

Influence of sputter deposition parameters on the properties of tunable barium strontium titanate thin films for microwave applications

“…For upcoming microwave applications, capacitance tunability is one key-functionality to adjust components and systems like phase-shifters, 1,2 tunable filters 3,4 and matching networks 5,6,7 to meet future requirements, e.g. for mobile communications up to 10 GHz.…”

Constraints on Efficient Control of Tunable Impedance Matching Network Based on Barium-Strontium-Titanate Thick-Film Varactors

“…(1)-(3) with the following g S ' and g L ' respectively, the component values can be recalculated. 1 and 1 (6) Furthermore, at the frequency ω m , the serial parasitic ohmic loss r ind of the inductor can be transformed to conductance g ind , which increases the conductance loaded at the point B and results in further reduction in the voltage at point B and P C . Accordingly as shown in Fig.…”

“…Since handset antennas are typically subject to environment surrounding and change their impedance, electrically tunable impedance matching networks are desirable to compensate the emerging mismatch. In recent years, developments in materials and processing techniques of the ferroelectric material of BariumStrontium-Titanate (BST) have enabled continuously tunable matching networks (TMN) with promising performance [1]- [3]. Different processing techniques i.e.…”

Design and Analysis of Frequency-Tunable Amplifiers using Varactor Diode Topologies

“…To the authors' knowledge, the impact of using tunable matching networks on amplifier efficiency and linearity has not been investigated previously. Although there are many tunable matching network designs, [2,15,25,28,32,33,35,38,39] examples of complete tunable amplifier modules are not many [6,8,11,18,37]. Most of the tunable amplifiers presented in the literature are designed for frequencies between 10-40 GHz and provide up to 10% tunability.…”