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Passive Filters

Passive Filters

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...

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Multilayer UWB bandpass filter using liquid crystal polymer technology.

Khaled Aliqab¹

¹Departement of Electrical Engineering, College of Engineering, Jouf University, Sakaka, Saudi Arabia. kmaliqab@ju.edu.sa.

Scientific Reports

|July 8, 2024

Summary

This summary is machine-generated.

This study introduces an ultra-wideband (UWB) bandpass filter using a Marchand balun for tunable bandwidth. The novel design achieves 110% fractional bandwidth (FBW) with low insertion loss.

Keywords:

Bandpass filter Liquid crystal polymer Multilayer UWB

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Area of Science:

Electrical Engineering
Electromagnetics
Microwave Engineering

Background:

Ultra-wideband (UWB) technology requires efficient bandpass filters for signal processing.
Traditional filters often face limitations in achieving wide fractional bandwidth (FBW) and tunable characteristics.
Marchand baluns offer versatile impedance matching capabilities crucial for UWB applications.

Purpose of the Study:

To propose and design a novel ultra-wideband (UWB) bandpass filter.
To achieve a wide fractional bandwidth (FBW) using a Marchand balun.
To provide guidelines for the synthesis and formulation of the UWB bandpass filter.

Main Methods:

Utilizing a planar Marchand balun for impedance matching and bandwidth tuning.
Connecting two planar Marchand baluns consecutively to leverage transversal filter concepts.
Employing multilayer liquid crystal polymer (LCP) technology for filter fabrication.

Main Results:

Achieved an ultra-wideband (UWB) performance from 3.1 to 10.7 GHz.
Demonstrated a central frequency of 6.8 GHz with a fractional bandwidth (FBW) of 110%.
Obtained low insertion loss of 0.3 dB and return loss of 12 dB.

Conclusions:

The proposed Marchand balun-based UWB bandpass filter offers tunable bandwidth and excellent performance.
The design is adaptable due to the diverse input/output impedances of the planar Marchand balun.
This work provides a comprehensive approach to formulating and synthesizing UWB bandpass filters for advanced applications.