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Investigation of new nondegenerate dual-mode microstrip patch filter

Investigation of new nondegenerate dual-mode microstrip patch filter

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A new nondegenerate dual-mode microstrip patch filter structure is introduced. The proposed filter is based on a square microstrip patch with four slots etched in symmetrical form. Besides its simple structure, the filter has the advantages of small size and low loss. The full-wave IE3D package is used to analyse the proposed structure. Design curves that relate the mode resonance frequencies and fractional bandwidth against slot parameters are presented. A bandpass filter is designed, analysed and tested at 2.15 GHz. Experimental results show good agreement with theoretical results.

References

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      • Curtis, J., Fiedziuszko, S.: `Miniature dual mode microstrip filters', IEEE MTT-S Int. Microw. Symp. Dig., 1991, p. 443–446.
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      • I. Wolff . Microsrtip bandpass filter using degenerate modes of microstrip ring resonator. Electron. Lett. , 12 , 302 - 303
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