Title :
Novel microstrip-line directional filters
Author :
Rosloniec, Stanislaw ; Habib, Tahar
Author_Institution :
Inst. of Radioelectron., Warsaw Univ. of Technol., Poland
fDate :
9/1/1997 12:00:00 AM
Abstract :
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
Keywords :
Doppler radar; microstrip filters; microwave filters; multiport networks; transceivers; four-port microwave directional filters; frequency characteristics; high-level isolation; microstrip-line directional filters; p-i-n diodes; phase-reversal units; pulse-radar applications; Admittance; Frequency; Microstrip filters; Microstrip resonators; Microwave filters; P-i-n diodes; Resonator filters; Scattering parameters; Slotline; Transmission line matrix methods;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
