Reconfigurable Three Functional Dimension Single and Dual-Band SDR Front-Ends Using Thin Film BST-Based Varactors

This paper presents a performance evaluation of single and dual-band software-defined radio (SDR) front-ends using commercially available barium strontium titanate (BST) thin film to control SDR receivers dynamic range and mitigate interference. Firstly, an SDR front-end solution using a BST-based s...

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Bibliographic Details
Published in:IEEE access 2022, Vol.10, p.4125-4136
Main Authors: Bouca, Patricia, Figueiredo, Ricardo, Matos, Joao Nuno, Vilarinho, Paula M., Carvalho, Nuno Borges
Format: Article
Language:English
Subjects:
Attenuation
Band-pass filters
Bandpass filters
Barium strontium titanates
Bias
Dual band
Dual-band bandpass filters
ferroelectric devices
frequency selectivity
Insertion loss
Interference
intermodulation distortion
Limiting
nonlinear measurements
Performance evaluation
power limiters
Radio frequency
SDR front-ends
Selectivity
Software radio
Thin films
three functional dimension devices
tunable microwave filters
Voltage measurement
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Summary:This paper presents a performance evaluation of single and dual-band software-defined radio (SDR) front-ends using commercially available barium strontium titanate (BST) thin film to control SDR receivers dynamic range and mitigate interference. Firstly, an SDR front-end solution using a BST-based single-band bandpass filter (BPF) is developed to manage in-band attenuation according to the input power. Secondly, a dual-band SDR front-end to avoid high power interference with its spectral content on the below side of the second band is designed. This device is performed with a BST-based dual-band BPF providing independent control of the power limiting capabilities of the first and second bands. The BST component introduces a dependence on bias voltage, frequency, and input power. Consequently, by applying a 0 V bias, it is possible to target interferers between 700 MHz up to 1 GHz and attenuate them more than 7 dB at 40 dBm. The frequency dependence is defined by the second band, which retains its filtering performance while performing interference cancellation in the first band. This SDR solution implements a three functional dimension device in the upper MHz with a power-dependent insertion loss, high threshold power level, and frequency selectivity.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2022.3140686