Compact Quadruple-Mode FSIW Filtering Power Divider With High Isolation Using Embedded Capacitive Isolation Network
- 28 February 2024
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Circuits and Systems II: Express Briefs
- Vol. 71 (8) , 3750-3754
Abstract
In this brief, a new compact filtering power divider (FPD) with high isolation utilizing embedded capacitive isolation network (CIN) is proposed, which is based on the quadruple-mode folded substrate integrated waveguide (FSIW) resonator. The dual-mode stepped-impedance stub-loaded resonator (SISLR) is the first embedded in the closed dual-mode FSIW to achieve the quadruple-mode resonator with reduced size. In addition, the CIN containing two interdigital capacitors is embedded in two hybrid resonators, which greatly improves the isolation of output ports as well as further effectively reduces the size of the FPD. In final, a prototype with 3-dB fractional bandwidth of 15.2% is designed and fabricated at 4.98 GHz (f0), and its insertion loss is 1.47 dB. The isolation and upper-stopband rejection are better than 25.2 dB, and 20 dB extended to 1.97f0, respectively. It occupies only 0.26 λg2, where λg is the guided wavelength at f0.Keywords
Funding Information
- National Natural Science Foundation of China (62201278)
- Natural Science Research Start-up Foundation of Recruiting Talents of Nanjing University of Posts and Telecommunications (NY221120)
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