Abstract
A bandpass filter (BPF) with improved upper-stopband performance has been studied and implemented with the aid of a ground plane based on high impedance structures (HIS). The microstrip structure of the filter on the top layer consists of three-order cascaded cross-shaped resonators loaded by folded split ring slots. The ground plane contains two groups of 2 × 5 lattice metallic mushroom array, showing high impedance at the spurious band so that the upper-stopband bandwidth of the BPF can be effectively broadened. The HIS-based ground can independently control the stopband without affecting passband performance. Experimental results demonstrate that the BPF exhibits an extremely broad stopband region from 15.5 to 49.2 GHz with a rejection level above 20 dB.
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