Reconfigurable CPW Band-Stop Filter based on Loaded T-Shaped Defected Ground Structure with Frequency and Stopband Width Tunability | Zendy

Claudia E. Perez-Martinez | Zendy; Lourdes Martinez-Lopez | Zendy; Rosalba Martinez-Lopez | Zendy; Jose I. Martinez-Lopez | Zendy

Open Access

Reconfigurable CPW Band-Stop Filter based on Loaded T-Shaped Defected Ground Structure with Frequency and Stopband Width Tunability

Author(s) -

Claudia E. Perez-Martinez,

Lourdes Martinez-Lopez,

Rosalba Martinez-Lopez,

Jose I. Martinez-Lopez

Publication year - 2025

Publication title -

ieee access

Language(s) - English

Resource type - Magazines

SCImago Journal Rank - 0.587

H-Index - 127

eISSN - 2169-3536

DOI - 10.1109/access.2025.3594721

Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation

This paper presents the design and implementation of a reconfigurable band-stop filter based on a coplanar waveguide (CPW) transmission line incorporating defected ground structures (DGS). The proposed filter consists of two pairs of T-shaped resonators loaded with varactor diodes and embedded in the ground plane of the CPW. The biasing configuration in the pair of resonators, either symmetric or asymmetric, enables dynamic tuning of the stopband frequency and bandwidth. The filter also features switchable functionality when the resonators are deactivated via forward-biased diodes, the structure behaves as an all-pass filter, exhibiting insertion loss below 1 dB over the 525 MHz to 3.255 GHz range. A parametric study investigates the influence of the spacing between resonators on the filter’s response to account for the mode splitting effect. Full-wave simulations and experimental results demonstrate tunable stopbands with isolation levels better than 20 dB from 1.40 to 1.65 GHz, with bandwidths ranging from 50 to 175 MHz. The proposed filter exhibits sharp roll-off characteristics, effective tuning and multifunction behavior, large isolation in the stopband and low insertion loss in the passband, making it a strong candidate for integration in adaptive RF front-ends, cognitive radio systems, and frequency-agile microwave circuits.

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