exact microwave frequency

Both are subsections of the electromagnetic spectrum below infrared and visible light. RF band is typically accepted as 30 kHz to 300 GHz, whereas microwaves are typically accepted as the range from 300 MHz (0.3 GHz) to 300 GHz. Therefore, microwaves are a subsection of the RF band.

you could go up somewjhat from that :) 1GHz is generally classed as the bottom end of the microwave bands

Dave

thanku......