As the colleagues above indicate your specification of your rectenna are too poor to comment.
Output voltage is not enough; to transmit DC POWER, you also must specify the detector load.
In my experiments I found that the propagation basics hold; one must irradiate a rectenna with a reasonable power density (which means a high RF power into a directional antenna, and counting propagation loss over a distance), and so far any available Schottky diodes can operate with a RF power of no more than +10 dBm, or 10 milliwatts. More power is simply reflected back and reradiated.
It may be easy to generate 1...3 V DC into a DVM with 10 MegOhm impedance. But loading the rectenna detector with a 1 kOhm load will drop the voltage to several millivolts, not a power for any use.
Many people try to play with rectennas but over years no progress was seen A new type of detector capable of a higher-power conversion at 2.45 GHz is needed.