Compact Microstrip Bandpass Diplexer Based on Twist Revised Split Ring Resonators

Table 1

Comparisons between the proposed diplexer and other compact designs.

Designs	of substrate	Frequency (GHz)	Size ()	Insertion loss (dB)	Isolation (dB)
[11]	4.5	1.85, 2.5	0.424 × 0.382	2.05, 2.15	>25
[14]	2.2	1.82, 2.5	0.193 × 0.297	2.51, 2.17	>55
[15]	3.38	1.8, 3.6	0.153 × 0.09	0.4, 0.5	>30
[16]	2.55	8, 9	1.325 × 1.325	2.86, 3.04	>40
[22]	2.2	1.8, 2.35	0.178 × 0.341	1.34, 1.44	>25
[23]	2.65	3.5, 4	0.944 × 0.765	1.95, 1.97	>25
This work	3.55	2.16, 2.91	0.217 × 0.217	1.25, 1.48	>30