ay design, and especially the physical distance between the elements in the array is related to the half-wavelength at the frequency of operation. Thus, unlike for FR1, the frequency range of operation of an antenna array is limited to 20-30% relative bandwidth, and multi- ple band support is not possible other than for adjacent or overlapping bands. This is actually the cases for bands n257, n258, and n261, but as they cover 20% of the relative bandwidth and designs can be optimized for a given region, a relaxation of the mini- mum EIRP and SC is allowed. Table 12.9 reports that the allowed relaxations depend on the band combinations. It is to be noted that relaxation is also allowed for combinations with band n260, although this one ideally requires a different array due to the signifi- cantly smaller wavelength compared to the 28 GHz bands. The two arrays can belong to the same module, and thus the array performance is influenced by the proximity of the other array, especially at large steering angles. For Release 15, only intra-band carrier aggregation is specified; with large bandwidths and fixed wireless access use cases, a large number of intra-band contiguous bandwidth classes have been defined when compared to the LTE legacy. These can be found in Table 12.10, which covers fallback groups based on 100 MHz, 200 MHz, and 400 MHz channel bandwidths and up to 8 carriers in the 100 MHz channel bandwidth case. 12.4.6 OTA Conformance Test Challenges OTA testing brings a whole set of measurement uncertainties (MUs) in addition to what formed the baseline of FR1 3GPP conducted conformance tests. For example, even if measurements could be performed conducted using "V" type coaxial connectors OBW = 91.88 MHz OBW 99.35 MHz OBW = 107.61 MHz ACLR = -23.9 dB ACLR = -22.8 dB ACLR = -21.9 dB er 24.3000 GHz Video BW 300.00 kHz' Span 300 MHzar 24.3000 GHz Video BW 300.00 kHz' Span 300 MHar 24.3000 GHz Video BW 300.00 kHz BW 30.000 kHz Span 300 MHz Sweep 397 ms (10001 pts)BW 30.000 kHz Sweep 397 ms (10001 pts BW 30.000 kHz 