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Dual-Band and Wideband Bandpass Filters Using Coupled Lines and Tri-Stepped Impedance Stubs
1Electrical Engineering Department, College of Engineering and Petroleum, Kuwait University, Safat, Kuwait City 13060, Kuwait.
Micromachines
|June 28, 2023
Summary
This study presents novel dual-band and wideband bandpass filters using coupled lines and tri-stepped impedance stubs. The filters demonstrate effective performance for applications like GSM and GPS, validating theoretical designs with experimental results.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Microwave Engineering
Background:
- Bandpass filters are crucial components in modern wireless communication systems.
- Existing filter designs often face limitations in achieving desired dual-band or wideband responses with high selectivity.
- Novel stub structures are needed to enhance filter performance.
Purpose of the Study:
- To design, implement, and validate two novel bandpass filters: one with a dual-band response and another with a wideband response.
- To investigate the performance characteristics of filters based on series coupled lines and tri-stepped impedance stubs.
- To confirm the effectiveness of these filters for specific applications like GSM and GPS.
Main Methods:
- Design and theoretical analysis of bandpass filters incorporating series coupled lines and tri-stepped impedance open stubs (TSIOSs) for dual-band response.
- Design and theoretical analysis of bandpass filters incorporating series coupled lines and tri-stepped impedance short-circuited stubs (TSISSs) for wideband response.
- Experimental implementation and testing of both filter designs using full-wave simulation and measurement.
Main Results:
- The dual-band filter exhibited two wide passbands centered at 0.92 GHz and 1.52 GHz, with fractional bandwidths of 38.04% and 22.36%, respectively, suitable for GSM and GPS.
- The wideband filter showed a center frequency of 1.51 GHz with a 62.91% fractional bandwidth and a selectivity factor of 0.90.
- Excellent agreement was observed between simulated and experimental results for both filter configurations.
Conclusions:
- The proposed novel combination of coupled lines and tri-stepped impedance stubs effectively enables the creation of high-performance dual-band and wideband bandpass filters.
- The designed filters meet the requirements for practical applications, offering wide passbands and good selectivity.
- The study validates the theoretical approach and demonstrates the feasibility of the implemented filter designs.
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