A novel compact microstrip dual-band bandpass filter with independently controlled center frequencies based on dual-mode resonators concept

Abstract

This letter presents a novel ultra-compact microstrip dual-band bandpass filter (DBBPF) with independently controlled center frequencies, and high Q-factor. The recommended DBBPF is realized by combining two different microstrip dual-mode resonators. One is a short-end stub-loaded resonator used to produce the first passband and the other one is an open-end stub-loaded resonator operating at the second passband which serves as part of the feed lines for the lower passband. To validate the performance of the proposed configuration, a novel compact DBBPF with center passband frequencies of 2.4 and 3.55 GHz is designed, simulated, fabricated and tested. A good agreement has been found between the simulation and measurement results. The designed microstrip DBBPF occupies a small area which is only about 0.19 λ_g × 0.15 λ_g. The presented microstrip DBBPF has many advantages in terms of compact size, low insertion loss, good frequency selectivity, easy fabrication, and high selectivity.

KEYWORDS:

• Dual bandpass filter (DBBPF)
• stub-loaded dual-mode resonators
• independently controlled center frequencies
• easy fabrication
• and compact size

Authors’ contributions

Mostafa Danaeian conceived of the presented idea. developed the theory and performed the computations. Mostafa Danaeian verified the analytical methods and discussed the results and contributed to the final manuscript.

Availability of data and materials

Data sharing is not applicable to this article as no new data were created or analyzed in this study.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Ethical Approval

The paper reflects the authors’ own research and analysis in a truthful and complete manner.