Table 2 Comparison of the proposed 3-dB coupler with other 3-dB couplers.
From: Extremely wideband ridge gap waveguide-based 3-dB coupler using supershaped coupling apertures
Ref | Tech | f0 (GHz) | BW (%) | Coupling (dB) | Isolation (dB) | Insertion loss (dB) | Coupling region length (λg) |
|---|---|---|---|---|---|---|---|
SIW | 10 | 160 | 3 ± 0.6 | 17 | 0.3 | > 6 | |
HW | 2.35 | 55.3 | 3 ± 0.34 | 21.3 | N.A | 0.7 | |
PRGW | 30 | 6 | 3.6 ± 1 | 12 | 0.8 | 1.1 | |
PRGW | 30 | 13 | 3.7 ± 0.8 | 13 | 1.12 | 1.12 | |
PRGW | 30 | 38 | 3.4 ± 0.5 | 15 | 0.55 | 1.3 | |
RGW | 15.5 | 14 | 3 ± 1 | 15 | 0.7 | 1.6 | |
GGW | 14 | 14.3 | 3.25 ± 0.75 | 20 | N.A | 3 | |
RGW | 18.5 | 40 | 3 ± 1 | 20 | 0.7 | 2 | |
GGW | 65.5 | 25 | 3 ± 0.5 | 20 | 0.65 | 2 | |
RGW | 11 | 13 | 3 ± 1 | 10 | 0.35 | 2 | |
RGW | 16 | 50 | 3 ± 0.7 | 15 | N.A | 2.2 | |
GGW | 20.5 | 29.1 | 3 ± 0.5 dB | 15 | 0.4 | 1.2 | |
This work | RGW | 29 | 75.8 | 3 ± 0.3 dB | 22 | 0.51 | 0.8 |
