Design of compact quadruplexer based on the tri-mode net-type resonators
Journal
IEEE Microwave and Wireless Components Letters
Journal Volume
21
Journal Issue
10
Pages
534-536
Date Issued
2011-10
Author(s)
Abstract
A compact size and high isolation microstrip quadruplexer based on the tri-mode net-type resonators is proposed in this letter. The quadruplexer is composed of four folded tri-mode net-type resonator filters with one input and four output coupled-line structures. By adjusting the structural parameters of a single tri-mode net-type resonator, its first three resonant frequencies can be controlled and, thus, it can be utilized to implement a third-order bandpass filter when these resonant frequencies are suitably assigned. The proposed third-order bandpass quadruplexer is constructed by only four tri-mode resonators, showing a small circuit size. In addition, no additional five-pole matching junction is needed for the quadruplexer design. As a result, the proposed quadruplexer occupies an extremely small area, i.e., 0.27 λ0 by 0.09 λ0 (0.42 λg by 0.13 λg), while still keeping good isolation better than 40 dB for each channel. © 2011 IEEE.
Subjects
Bandpass filter (BPF); coupling; microstrip; net-type resonator; quadruplexer
Other Subjects
Band pass; Circuit size; Compact size; Coupled lines; High isolation; Microstripes; net-type resonator; quadruplexer; Resonator filters; Small area; Structural parameter; Third-order; Bandpass filters; Microwave filters; Natural frequencies; Resonators; Microstrip filters
Type
journal article