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A Survey of Differential-Fed Microstrip Bandpass Filters: Recent Techniques and Challenges

Al-Yasir, Yasir I. A.; Ojaroudi Parchin, Naser; Abdulkhaleq, Ahmed M.; Bakr, Mustafa S.; Abd-Alhameed, Raed A.


Yasir I. A. Al-Yasir

Ahmed M. Abdulkhaleq

Mustafa S. Bakr

Raed A. Abd-Alhameed


Differentially driven devices represent a highly promising research field for radio frequency (RF), microwave (MW), and millimeter-wave (mmWave) designers and engineers. Designs employing differential signals are essential elements in low-noise fourth-generation (4G) and fifth-generation (5G) communications. Apart from the conventional planar MW components, differential–fed balanced microstrip filters, as promising alternatives, have several advantages, including high common-mode rejection, low unwanted radiation levels, high noise immunity, and wideband harmonic suppression. In this paper, a comprehensive and in-depth review of the existing research on differential-fed microstrip filter designs are presented and discussed with a focus on recent advances in this research and the challenges facing the researchers. A comparison between different design techniques is presented and discussed in detail to provide the researchers with the advantages and disadvantages of each technique that could be of interest to a specific application. Challenges and future developments of balanced microstrip bandpass filters (BPFs) are also presented in this paper. Balanced filters surveyed include recent single-, dual-, tri-, and wide-band BPFs, which employ different design techniques and accomplish different performances for current and future wireless applications.

Journal Article Type Article
Acceptance Date Apr 14, 2020
Online Publication Date Apr 21, 2020
Publication Date 2020
Deposit Date Feb 21, 2022
Publicly Available Date Feb 21, 2022
Journal Sensors
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 20
Issue 8
Article Number 2356
Keywords differential-fed filter; microstrip; RF; MW; 4G; 5G; bandpass
Public URL


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