Research Article
Design of a Microwave Quadrature Hybrid Coupler with Harmonic Suppression Using Artificial Neural Networks
Table 3
Performance summary of the presented coupler and similar works.
| Refs. | Frequency (GHz) | Harmonics suppression | Isolation (dB) | Return loss (dB) | Insertion loss (dB) | Type | Applied technique |
| [8] | 1 | 2nd to 5th | 19 | 18 | 0.2 | Coupler | Open ended resonator | [48] | 1.8 | 2nd and 3rd | 20 | 20 | 0.6 | Power divider | EBG | [49] | 1 | 3rd to 5th | 30 | 30 | 0.2 | Power divider | Capacitor loading | [50] | 2.4 | 2nd and 3rd | 20 | 22 | 0.65 | Power divider | Spiral resonant cell | [51] | 0.9 | 3rd | NA | 36 | 0.325 | Power divider | Complementary split ring resonator | [52] | 1 | 2nd to 4th | 32 | 40 | 0.25 | Power divider | Controllable transmission zeros | [53] | 1 | ā | 25 | 20 | 0.5 | Coupler | Fractal resonators | [54] | 26 | ā | 11 | 11 | 1 | Coupler | Dielectric constant | [55] | 0.9 | 2nd and 3rd | 28 | 28 | 0.3 | Coupler | Open stubs | [56] | 0.9 | 3rd and 5th | 31 | 36 | 0.3 | Coupler | Resonant cell | [57] | 3 | 2nd to 4th | 23 | 23 | 0.4 | Coupler | Nonuniform lines | This work | 1 | 3rd to 14th | 22.5 | 21 | 0.4 | Coupler | Elliptic filter and ANN |
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