Figure 3
From: Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression

(a) The geometry of SSLSIR without slit line. (b) The equivalent circuit of SSLSIR without slit line. (c) The geometry of SSLSIR with two slit line loaded. (d) The equivalent circuit of SSLSIR with two slit line loaded.