The UHF frequency band covers the range from 300 MHz to 3 GHz. RAIN RFID systems comply with the UHF Gen2 standard and use the 860 to 960 MHz band. While there is some variance in frequency from region to region, RAIN RFID systems in most countries operate between 900 and 915 MHz. The MAX2235 low-voltage, silicon RF power amplifier (PA) is designed for use in the 900MHz frequency band.