The latest cellular network called 5G NR is actually done in 2 steps with FR1 which was covered at cellular antennas and FR2 which introduces a need for 5G mmWave antenna design. FR2 defines a set of new frequencies:
• n257 at 28GHz (26.50-29.50GHz)
• n258 at 26GHz (24.25-27.50GHz)
• n260 at 39GHz (37.00-40.00GHz)
The frequency range differs greatly from the below 6GHz frequencies of earlier cellular bands and introduces several new design challenges.