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A novel compact high selectivity wideband differential bandpass filter with wideband common mode suppression using Marchand balun is presented in this paper. Open/shorted coupled lines and stubs are used to improve the selectivity for the differential mode and common mode suppression. The demonstrated filter with a compact size of 24 mm × 12 mm exhibits a fractional bandwidth of 53% centered at 3...
As one of the most important components in RF/microwave systems, high-performance wideband bandpass filters with low insertion loss within the passband and large attenuation in the stopband are extremely desirable [1], [2]. Moreover, as shown in Figure 1(a), the definition of the fractional bandwidth for the narrowband bandpass filter is less than 1%; and the fractional bandwidths for wideband/ultrawideband...
A compact ultra-wideband (UWB) bandpass filter (BPF) based on transversal signal-interaction concepts is proposed in this letter. Two transmission paths with a wideband double-sided parallel-strip line (DSPSL) 180° swap and a 3λ/4 transmission line are used to transmit signal from Port 1 to Port 2. Two λ/4 shorted lines are introduced to improve the passband transmission characteristic. Two transmission...
A novel ultra-wideband (UWB) bandpass filters using planar Marchand balun are proposed and demonstrated in this paper. Based on the intrinsic 180° phase difference of the planar Marchand balun and the transversal filter concepts, one kind of UWB bandpass filter (3 dB fractional bandwidth ranging from 86% to 111.5%) with two transmission zeros located close to the passband can be realized, by cascading...
In this paper, a novel microstrip differential filter with shorted parallel coupled-line is proposed. Based on the transversal signal-interference concept, a passband can be achieved when the differential mode signal is excited, while a stopband can be obtained when the common mode signal is excited. The proposed differential filter was analyzed and simulated. A prototype is fabricated for demonstration...
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