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Bandpass Sampling

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Modified Triple-Tuned Bandpass Filter with Two Concurrently Tuned Transmission Zeros.

Mirosław Magnuski¹, Artur Noga¹, Maciej Surma¹

¹Department of Electronics, Electrical Engineering and Microelectronics, Silesian University of Technology, Akademicka 16, 44-100 Gliwice, Poland.

Sensors (Basel, Switzerland)

|December 23, 2022

Summary

This study presents a novel triple-tuned microstrip bandpass filter using varactor-tuned resonators and advanced coupling techniques. The filter achieves sharp transition bands and tunable frequency control for preselector applications.

Keywords:

constant fractional bandwidth microstrip technology single control voltage tunable bandpass filter

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Area of Science:

Electrical Engineering
Electromagnetics
Microwave Engineering

Background:

Microstrip bandpass filters are crucial components in RF systems.
Achieving sharp transition bands and tunable frequency response remains a challenge.

Purpose of the Study:

To introduce a modified triple-tuned microstrip bandpass filter with enhanced performance.
To demonstrate the concurrent tuning of transmission zeros with the operating frequency.

Main Methods:

Utilizing inductively cross-coupled resonators tuned with varactors.
Implementing additional source-load couplings and resonator branch swapping.
Manufacturing and validating an example filter tuned from 0.36 to 0.78 GHz.

Main Results:

The filter exhibits two transmission zeros tuned concurrently with the operating frequency, enhancing slope steepness.
Achieved a constant fractional bandwidth of 11% and low in-band insertion loss (1.8–2.5 dB).
Demonstrated out-of-band attenuation up to 5 GHz without parasitic passbands.

Conclusions:

The modified triple-tuned microstrip bandpass filter offers significant improvements in selectivity and tunability.
The filter's performance makes it highly suitable for preselector networks in various RF applications.