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Novel microstrip-line directional filters

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2 Author(s)
S. Rosloniec ; Inst. of Radioelectron., Warsaw Univ. of Technol., Poland ; T. Habib

This paper presents two new structures of four-port microwave directional filters incorporating microstrip-line resonators, uniplanar 180° phase-reversal units, and two or four identical p-i-n diodes. These filters provide substantially improved frequency characteristics compared to the conventional constructions. The unique feature of them is that they ensure high-level isolation independent of frequency between opposite ports. Due to this electrical property the proposed filters may be suitable for some pulse-radar applications

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:45 ,  Issue: 9 )