Design for a Self-Packaged All-PCB Wideband Filter with Good Stopband Performance

A new design of a self-packaged all-PCB ultrawideband filter based on the cascade connection of high-pass and low-pass filters is presented. The novel low-pass and high-pass quasi-lumped filter structure differs from the known one by the existence of cross-coupling between elements producing transmission zeroes at the desired frequency. The filter fabricated using materials with a rather low quality factor has demonstrated a good performance: the central frequency is 0.99 GHz, the 1 dB bandwidth is 151%, the minimum in-band loss is 0.3 dB, the selectivity (Δf
30dB
/Δ f
3dB
) is 1.21, and the 40 dB stopband width is 6.10
$f$
0
.