Exploiting High-Isolation 2nd-Harmonic Backscatters for Distance-Adaptive Microwave Power Delivery

Microwave power delivery always suffers unknown distances between transmitting (TX) and receiving (TX) antennas. To smooth away such problem, 2
^nd
harmonics generated from a rectifier approaching its voltage compression output (breakdown) are exploited. Meanwhile, with an integration of a modified ring coupler and a dual-linearly-polarized antenna, the fundamental incidences and 2
^nd
harmonics can be highly isolated by different channels. Theoretical analysis as well as some experiment results has validated this proposed novel technique for distance-adaptive microwave power delivery.