This example illustrates the case of a wireless device having three frequency bands. Each frequency band may have multiple modulations, but only the transmission mode having the highest output power will be tested in accordance with 6.6.2. The fast SAR method uses different hardware from the full SAR system and is able to perform a SAR measurement in a very short time (less than 1 % of the full SAR measurement time). The SAR values reported here are 10 g average values, with the applicable SAR limit of 2 W/kg applied. The SAR values are generated using a random number generator, similarly to the SAR values reported in K.3.2. The steps of the procedure of 6.6.2 are followed below. There are eight test configurations per frequency band. An example of what would create eight test configurations is testing at both sides of the head (left and right) in both tilt and cheek positions for a device that has two different battery types.
a) Use the fast SAR method to perform measurements on a number of test configurations.
The test configurations should be grouped separately per the N different frequency bands and modulations evaluated.
Table K.9 shows the results of the fast SAR measurements. Since the fast SAR measurement system performs measurements faster than the time needed for device positioning, it makes sense to perform the tests across the frequency band at the same time.
Table K.9 – Fast SAR measurements conducted according to Step a)
Test config.
number
Band 1 Band 2 Band 3
low mid high low mid high low mid high
1 0,961 1,046 1,294 0,472 0,535 0,514 0,438 0,498 0,483
2 0,956 0,752 0,551 1,041 0,774 0,757 0,449 0,480 0,625
3 0,452 0,962 0,654 1,258 1,078 0,630 0,767 0,576 0,499
4 0,821 0,662 0,627 0,446 0,672 0,427 0,275 0,335 0,245
5 0,751 0,704 0,487 0,883 1,252 0,861 0,523 0,559 0,286
6 1,130 1,519 1,519 0,545 0,717 0,391 0,377 0,321 0,323
7 0,447 0,831 0,881 0,839 0,952 0,976 0,231 0,434 0,431
8 1,063 1,183 1,536 0,669 0,575 0,312 0,459 0,433 0,561
b) For each of the N frequency bands and modulations evaluated in Step a), find the test configuration having the highest SAR value measured by the fast SAR technique, denoted SARmax,fasti (i = 1 to N). Use the full SAR method (according to the procedure in 6.4.2) to measure each of the N test configurations identified in this step, denoted SARmax,fulli. Select the maximum value among the N test configurations, SARmax,full = max(SARmax,fulli).
There are N = 3 frequency bands. The highest SAR configurations for the N = 3 frequency bands are SARmax,fast1 = 1,536 W/kg, SARmax,fast2 = 1,258 W/kg and SARmax,fast3 = 0,767 W/kg, as shown in Table K.10. The measured values of SARmax,fulli for i = 1, 2 and 3 are shown in Table K.11. SARmax,full = max(1,662 W/kg, 1,530 W/kg, 0,815 W/kg) = 1,662 W/kg.
Table K.10 – Fast SAR measurements showing highest SAR value according to Step b)
Test config, number
Band 1 Band 2 Band 3
low mid high low mid high low mid high
1 0,961 1,046 1,294 0,472 0,535 0,514 0,438 0,498 0,483
2 0,956 0,752 0,551 1,041 0,774 0,757 0,449 0,480 0,625
3 0,452 0,962 0,654 1,258 1,078 0,630 0,767 0,576 0,499
4 0,821 0,662 0,627 0,446 0,672 0,427 0,275 0,335 0,245
5 0,751 0,704 0,487 0,883 1,252 0,861 0,523 0,559 0,286
6 1,130 1,519 1,519 0,545 0,717 0,391 0,377 0,321 0,323
7 0,447 0,831 0,881 0,839 0,952 0,976 0,231 0,434 0,431
8 1,063 1,18 1,536 0,669 0,575 0,312 0,459 0,433 0,561
Table K.11 – Full SAR measurements conducted according to Step b)
Test config.
number
Band 1 Band 2 Band 3
low mid high low mid high low mid High
1 2
3 1,530 0,815
4 5 6 7
8 1,662
c) From the N groups of frequency bands and modulations defined in Step a), choose the i-th one corresponding to SARmax,full in Step b). For this i-th group, use the full SAR method (according to the procedure in 6.4.2) to measure all other test configurations (j = 1 to M, where M is the number of test configurations in the i-th group) if the condition of Formula (11) is met.
SARmax,full is from the i = 1 group. Using Formula (11), with Ufast = 10 %, Bfast is calculated as 1,027 6. From Formula (10), Bfast− Bfast2−1=0,791 . From Table K.10,
SARmax,fast1 = 1,536 W/kg, so all test configurations where
SARfasti ≥ 1,536 W/kg × 0,791 = 1,215 W/kg should be measured with the full SAR method.
There are only four test configurations which satisfy this condition, as shown in bold in Table K.12. This step therefore involves three full SAR measurements, shown in bold in Table K.13 below.
Table K.12 – Fast SAR measurements showing values according-to requirements in Step c)
Test config, number
Band 1 Band 2 Band 3
low mid high low mid high low mid high
1 0,961 1,046 1,294 0,472 0,535 0,514 0,438 0,498 0,483
2 0,956 0,752 0,551 1,041 0,774 0,757 0,449 0,480 0,625
3 0,452 0,962 0,654 1,258 1,078 0,630 0,767 0,576 0,499
4 0,821 0,662 0,627 0,446 0,672 0,427 0,275 0,335 0,245
5 0,751 0,704 0,487 0,883 1,252 0,861 0,523 0,559 0,286
6 1,130 1,519 1,519 0,545 0,717 0,391 0,377 0,321 0,323
7 0,447 0,831 0,881 0,839 0,952 0,976 0,231 0,434 0,431
8 1,063 1,18 1,536 0,669 0,575 0,312 0,459 0,433 0,561
Table K.13 – Full SAR measurements conducted according to Step c)
Test config, number
Band 1 Band 2 Band 3
low mid high low mid high low mid high
1 1,611
2
3 1,530 0,815
4 5
6 1,535 1,573
7
8 1,662
d) From the full SAR measurements that have been measured so far, denoted SARfulli,j, choose the highest value, SARhighest,full = max(SARfulli,j):
SARhighest,full = max(1,611 W/kg, 1,535 W/kg, 1,573 W/kg, 1,662 W/kg, 1,530 W/kg,
0,815 W/kg) = 1,662 W/kg.
e) For each i-th group of frequency bands and modulations (i = 1 to N) that has not been evaluated according to Step c), use the threshold of Formula (13) to determine if Step c) is needed.
From Formula (13) with Ufast = 10 % and Ufull = 15 %, B = 1,095 8 and 648
, 0
2 1
fast
fast− B − =
B . For i = 2, SARmax,full2 = 1,530 W/kg. This is higher than W/kg
077 ,1 648 , 0 W/kg 662 ,1
2 1
fast fast full
highest, = × =
B − B −
SAR . Therefore, Step c) should be
repeated for i = 2. However, for i = 3, SARmax,full3 = 0,815 W/kg which is less than 1,077 W/kg. So Step c) is not needed for i = 3.
For i = 2, all test configurations where SARfast2,j ≥ 1,258 W/kg × 0,791 = 0,995 W/kg should be tested with the full SAR system (shown in bold in Table K.14). Therefore, three additional full SAR tests are needed, with the results shown in Table K.15.
Table K.14 – Fast SAR measurements showing values according to requirements in Step e)
Test config, number
Band 1 Band 2 Band 3
low mid high low mid high low mid high
1 0,961 1,046 1,294 0,472 0,535 0,514 0,438 0,498 0,483
2 0,956 0,752 0,551 1,041 0,774 0,757 0,449 0,480 0,625
3 0,452 0,962 0,654 1,258 1,078 0,630 0,767 0,576 0,499
4 0,821 0,662 0,627 0,446 0,672 0,427 0,275 0,335 0,245
5 0,751 0,704 0,487 0,883 1,252 0,861 0,523 0,559 0,286
6 1,130 1,519 1,519 0,545 0,717 0,391 0,377 0,321 0,323
7 0,447 0,831 0,881 0,839 0,952 0,976 0,231 0,434 0,431
8 1,063 1,18 1,536 0,669 0,575 0,312 0,459 0,433 0,561
Table K.15 – Full SAR measurements conducted according to Step e)
Test config, number
Band 1 Band 2 Band 3
low mid high low mid high low mid high
1 1,611
2 1,153
3 1,530 1,201 0,815
4
5 1,342
6 1,535 1,573
7
8 1,662
f) Use the full SAR method to measure any other test configurations that have not been tested by the fast SAR method in Step a).
This step is not needed, as testing across the frequency band has already been conducted.
In this example, a value of 1,662 W/kg is the peak spatial-average SAR measured with full SAR method across all frequency bands.
For this example, nine full SAR tests were performed. If fast SAR testing had not been applied, 24 full SAR tests would have been required for the centre frequency alone. With low and high channel testing requirements of 6.2.5, additional full SAR tests would also have been required if fast SAR had not been applied.