Abstract
In this paper, a seven-pole balanced filter is presented with sharp skirt and extended upper-stopband in differential-mode (DM) response. Based on slotline resonator published in previous works, boundary conditions are briefly discussed in order to explain the mechanism of multi-mode DM transmission and intrinsic high common-mode (CM) suppression in the microstrip-slotline (MS) conversion. Then a λ/2 stepped-impedance resonator (SIR) is loaded on the center of traditional slotline resonator for enhanced DM selectivity. Several T-shape and L-shape short-circuited stubs are introduced for extended DM upper-stopband. The proposed balanced filter is simulated, fabricated and measured afterwards. Finally, measured and simulated results are in good agreement, indicating favorable performances such as 7-mode bandpass response with enhanced selectivity, extended upper-stopband rejection and intrinsic high CM suppression.
Published Version
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