Hybrid Microstrip/Slotline Ultra-Wideband Bandpass Filter with a Controllable Notch Band

Table 1

Comparisons between referenced works and our work.

Ref. number	CFs (GHz)/FBW (%)	Notch band (GHz)/ (dB)	In-band return loss (dB)	Circuit size
[8]	3.65/63,; 5.8/69	5.22/20	>14/>12	0.309
[10]	3.96/59,; 8.31/60	5.47/25	>12/>11	0.272
[12]	4.4/32,; 8.2/65	5.3/37,; 5.4/35	>15/>12	0.187
This work	3.8/52,; 8.31/49	5.1/39,; 5.5/45	>14/>18	0.181