Optimum Design of Multi-Section Asymmetrical Transdirectional Couplers with Port Impedance Matching up to S Band Frequency

Table 10

Compression between TRD coupler in other papers and this study 10 dB ATRD coupler.

Reference	Isolation 20 dB	Through	Coupling	Return loss 15 dB	Technology	Structure
[8]	1.421–1.520 GHz (6.3%)	0.68 0.2 dB	10.8 0.4 dB	1.36–1.66 GHz (19.8%)	DGS CPWs	Symmetrical
[6]	3.31–3.93 GHz (17.13%)	2.18 0.18 dB	2.5 0.5 dB	3.05–4.1 GHz (29.3%)	Single layer PCB	Symmetrical
[7]	1.5–1.69 GHz (11.91%)	3.47 0.33 dB	3.18 0.37 dB	1.42–1.82 GHz (24.6%)	Single layer PCB	Symmetrical
This study	3.32–3.68 GHz (10.2%)	0.86 0.03 dB	−11.7 0.2 dB	2.7–3.8 GHz (33.8%)	Single layer PCB	Asymmetrical