Abstract
In this chapter a cascaded bandpass filter composed of three open-loop λ/2 resonators is proposed. The three elements are electromagnetically coupled. They are placed on the top of a multiplayer structure. Electromagnetic simulation of the cascaded bandpass filter shows good results in both passband and in stopbands. The filter provides two 3-dB attenuation pole frequencies f 1 at 2.95 GHz, f 2 at 3.25 GHz, and a center frequency f 0 at 3.1 GHz. In order to develop and to miniaturize this planar three-pole microstrip bandpass filter, two ideas are developed and implemented that are based on DGS technique and the coupling matrix method. Using DGS resonators on the ground structure, a compact filter with improved response has been realized. The proposed filter has been fabricated on a substrate with dimensions of (0.57λ g × 0.28λ g ). The simulated and measured results show good agreement and validate the proposed approach.
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References
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Boutejdar, A., Batmanov, A., Omar, A., Burte, E. (2010). A Miniature 3.1 GHz Microstrip Bandpass Filter with Suppression of Spurious Harmonics Using Multilayer Technique and Defected Ground Structure Open-Loop Ring. In: Sabath, F., Giri, D., Rachidi, F., Kaelin, A. (eds) Ultra-Wideband, Short Pulse Electromagnetics 9. Springer, New York, NY. https://doi.org/10.1007/978-0-387-77845-7_20
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DOI: https://doi.org/10.1007/978-0-387-77845-7_20
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