Abstract
In this paper, a novel four-band diplexer using defected ground structures with compact size, low insertion loss and high isolation is presented. To begin with, there are 16 defected ground stepped impedance resonators (DSIRs) controlling four passbands characteristics. Every four DSIRs can generate one passband. Then, four different DSIRs use the same feeding line. According to the group delay, we can determine the relative physical position of the first resonator. For the demonstration, a four-band diplexer operating at 2.45/4.2 and 3.5/5.2 GHz with the fractional bandwidths of 10, 7, 6.2 and 5% is designed and fabricated. Finally, measured results agree well with simulated results.
Funding source: National Natural Science Foundation of China (NSFC)
Award Identifier / Grant number: 62071357
Award Identifier / Grant number: 61001039
Award Identifier / Grant number: 61471292
Award Identifier / Grant number: 61471292
Funding source: Fundamental Research Funds for the Central Universities
Award Identifier / Grant number: JB210208
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This work was supported by the National Natural Science Foundation of China (NSFC) under project nos. 62071357, 61001039, 61471292 and 61471292, and the Fundamental Research Funds for the Central Universities no. JB210208.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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