Compact and Wideband Parallel-Strip 180° Hybrid Coupler with Arbitrary Power Division Ratios

Table 3

Summarized performance of the four couplers.

𝑘	Impedance bandwidth	Average 𝑘	Port-to-port isolation	Phase error
1	120%	1.02	>29 dB	<5°
2	112%	1.85	>27 dB	<5°
4	119%	2.89	>25 dB	<7°
8	129%	7.55	>28 dB	<6°