Four-Port Dual-Mode Diplexer with High Signal Isolation

Table 1

Dimensions of four-port microstrip dual-mode resonator diplexer.

Dimensions	RX = 1.95 GHz	TX = 2.14 GHz
Resonator width ()	1 mm	1 mm
Feed width (wf)	1.87 mm	1.87 mm
Coupling-feed width (cf)	0.4 mm	0.4 mm
Space between coupling feed and dual-mode resonator ()	0.6 mm	0.6 mm
Resonator length (a)	14 mm	14 mm
Resonator length (b)	18.5 mm	16.9 mm
Resonator length (c)	11.94 mm	10.2 mm
Feed length (ft)	19.8 mm	19.8 mm
T-junction length (t)	29.35 mm	27.05 mm
Delayed-line length (k)	18.5 mm
Microstrip line length (m)	5.58 mm
Delayed-line length (n)	17.7 mm