Balanced tri- and quad-band BPFs based on SIR with improved passbands selectivity
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Jia-Qi Wang
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Kai-Xuan Wang
Abstract
In this paper, balanced tri- and quad-band bandpass filters (BPFs) with high selectivity and controllable center frequencies and bandwidths are proposed. In the tri-band BPF design, two differential-mode (DM) passbands are formed by utilizing a stub-loaded resonator (SLR) and a uniform impedance resonator (UIR). The coupling structure of the proposed BPF realizes the third DM passband. Moreover, the center frequencies and bandwidths of the three DM passbands can be controlled by the lengths of resonators and the gaps between the resonators. In order to improve the DM selectivity further, the source-load-coupled structure is introduced. In addition, common-mode (CM) suppression is achieved by using L-shaped balanced microstrip line to slotline transition structures, achieving the independence between CM responses and DM ones. Therefore, the design procedure can be simplified greatly. In order to validate the practicability, one balanced tri-band BPF operating at 2.5, 3.5 and 4.5 GHz is designed and fabricated. Moreover, by adding a short stub to the UIR located in the symmetrical plane, one flexible resonance frequency is generated, which is used to design the balanced quad-band BPF. By manufacturing and measurement, the measurement and simulation are in good agreement.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: The raw data can be obtained on request from the corresponding author.
References
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Articles in the same Issue
- Frontmatter
- A wideband tunable quadrature coupler with flat coupling
- Small size dual-band coupled-line coupler for WiMAX applications
- A flexible wideband wearable CPW antenna for WBAN application
- A dual-band dual-mode customer premises equipment antenna
- A compact multiband frequency reconfigurable antenna integrated with sextuple band artificial magnetic conductor for heterogeneous wireless applications
- A wideband reconfigurable filtering phase shifter based on Stub-loaded multimode resonators
- Balanced tri- and quad-band BPFs based on SIR with improved passbands selectivity
- A metasurface with three different configurations for absorption, transmission or reflection of incident electromagnetic waves
- Experimental study on thermal cycling of nano-silver and nano-silver coated tin flip solder joints
