Review Article
Overview on the Phase Conjugation Techniques of the Retrodirective Array
Table 1
Comparison of the phase conjugation mixers using balanced structures.
| | RF fed | LO fed | Characteristics |
| | rat-race coupler | out of phase | in phase | simple structure, poor isolation degree, and broadband use |
| | balanced mixer 1 | out of phase | out of phase | good isolation degree |
| | balanced mixer 2 | out of phase | in phase | combined RF/IF port |
| | delay line | in phase | in phase | combined RF/IF port, delay line in one channel, and used in narrow band or point frequency |
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