Design of Multimode Net-Type Resonators and Their Applications to Filters and Multiplexers

• Published in: IEEE transactions on microwave theory and techniques Vol. 59; no. 4; pp. 848 - 856
• Main Authors: Chen, Chi-Feng, Shen, Tze-Min, Huang, Ting-Yi, Wu, Ruey-Beei
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2011; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Allocations; Applied sciences; Bandpass filter; Bandwidth; Circuit properties; Circuits; coupling coefficient; Couplings; Devices; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Impedance; microstrip; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Microwaves; multiplexer; Multiplexers; Multiplexing; net-type resonator; Organization, operation and development plans; Oscillators, resonators, synthetizers; Passband; Q factor; Radiocommunications; Resonant frequencies; Resonant frequency; Resonators; Simulation; Switching, multiplexing, switched capacity circuits; Telecommunications; Telecommunications and information theory; Performance evaluation; Resonator; Microwave device; Multiplexer; Frequency allocation; Open line; net-type resonator; Mode filter; Bandpass filter; microstrip; Transmission line; Simulation; Coupling coefficient; Resonance frequency; Band pass filter; Electrical characteristic
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/TMTT.2011.2109392

Net-type resonators with dual- and tri-mode electrical behaviors have been presented and analyzed theoretically in this paper. The proposed net-type resonator is constructed by a short-ended and several open-ended transmission-line sections, which has the advantages of small size and more flexible resonant frequency allocation and is therefore particularly suitable for applications to the design of microwave devices. To verify the usefulness of the proposed resonators, three experimental examples, including a dual-mode bandpass filter, a dual-passband filter, and a triplexer, have been designed and fabricated with microstrip technology. Each of the designed circuits occupies a very small size and has a good upper stop and performance. All measured results are in good agreement with the full-wave simulation results.