Jagadish Nadakuduti EME Research Engineer, Motorola, Inc .

C63.19 SC8 WG3 meeting, March 26, 2007

Calibration values for dipole validations at new RF probe separation distance of 1.5cmPINS-C item 5.k

Jagadish NadakudutiEME Research Engineer, Motorola, Inc.


Outline• Background

– C63.19-2006 Amendment: Change the RF measurement position from bottom of probe element to the center of element and change the test distance from 10mm to 15mm

• FDTD simulations

• Updated Table 4.2 and Table D.4

• Measurements

• Conclusion


Background: PINS-C item 5.kThe RF probe separation distance is 15 mm and the calibration values in table 4.2

were made at 10 mm. These calculations need to be redone at 15 mm distance.

15 mm


FDTD simulations: E- & H-field patterns

Update field values from 10 mm to 15 mm distance


FDTD simulations: Results at 10 mm

• Created FDTD models as specified in “D.5.1.4 Dipole validation theoretical modeling”.

• Comparison of FDTD simulations results to those specified in Table D.4.

Mod. Freq.(MHz)

CW peak E (V/m)existing new

CW peak H (A/m)existing new

|Zo|(Ω)

Return loss (dB)

VSWR Gain(dBi)

CW 813.5 268 270.9 0.68 0.6651 74.7, 75.8 -10.0, -10.1 1.925, 1.9 2.25, 2.235

CW 835 265 261.4 0.673 0.6847 75.3, 76.3 -12.0, -12.1 1.67, 1.66 2.32, 2.29

CW 898.5 262 264.7 0.675 0.6820 75.5, 76.9 -11.9, -11.8 1.68, 1.69 2.33, 2.3

CW 1880 211 211.6 0.645 0.6482 87.1, 89.7 -10.6, -10.3 1.837, 1.87 2.52, 2.55

Table D-4. Results of FDTD modeling for ‘Thick dipoles’ (existing values vs. new simulation results)


FDTD simulations: Results at 10 mm contd.• CW peak E- and H-field values taken from table D-4 are converted into

RMS values. These values are incorporated into Table 4.2.Table 4.2 – Illustrated dipole calculated values (existing and new simulation results)

• “D.5.1.4 Dipole validation theoretical modeling” section describes simulations for ‘thick dipoles’ and has no information on modeling parameters for ‘planar dipoles’. The relatively high difference between values specified in table 4.2 and those from new simulations in case of ‘planar dipoles’ might be because of using different simulation parameters.

Dipole Freq.(MHz)

E-field values (V/m)existing new

difference H-field values (A/m)existing new

difference

D.5.1 thick 813.5 190 192 1.1% 0.476 0.4842 1.7%

D.5.1 thick 835 187 185 -1.1% 0.481 0.4703 -2.2%

D.5.1 thick 898.5 185 187 1.1% 0.477 0.4822 1.1%

D.5.1 thick 1880 149 150 0.7% 0.456 0.4584 0.5%

D.5.1 planar 813.5 224.6 - 236.4 257.2 8.8% 0.5139-0.5226 0.57 9.1%

D.5.1 planar 835 214.9 - 232.2 250 7.7% 0.4954-0.5164 0.5523 7%

D.5.1 planar 898.5 213.2 - 220.9 248.4 12.4% 0.5032-0.5005 0.5622 11.7%

D.5.1 planar 1880 153.6 - 149.3 182.3 18.7% 0.4478-0.4035 0.5091 13.7%


Measurements:At 10 and 15 mm of probe separation distance with 100 mW of input power

Frequency(MHz)

E (V/m) H (A/m)10 mm 15 mm 10 mm 15 mm

813.5 171 108.3 0.4597 0.3146835 185.9 116.6 0.4692 0.3253

1880 156.2 96.1 0.4433 0.3192

Frequency(MHz)

E (V/m) H (A/m)10 mm 15 mm 10 mm 15 mm

813.5 211.9 131.1 0.497 0.3391835 213.5 131.5 0.4987 0.3412

898.5 202.7 126.4 0.4963 0.34231880 153.4 93.05 0.4748 0.3289

• Thick dipoles

• Planar dipoles*898.5 MHz thick dipole is not available in the lab


Updated Table D.4 at 15 mm

Mod. Freq.(MHz)

CW peak E(V/m) (dB V/m)

CW peak H(A/m) (dB A/m)

|Zo|(Ω)

Return loss (dB)

VSWR Gain(dBi)

CW 813.5 179 45.1 0.493 -6.14 75.8 -10.1 1.9 2.235

CW 835 172 44.7 0.48 -6.38 76.3 -12.1 1.66 2.29

CW 898.5 174 44.8 0.492 -6.16 76.9 -11.8 1.69 2.3

CW 1880 139 42.9 0.472 -6.52 89.7 -10.3 1.87 2.55

Table D-4. Results of FDTD modeling at 15 mm


Table 4.2 at 10 mm with measurement results

Table 4.2 – Illustrated dipole calculated and measured values

Dipole Freq.(MHz)

E-field values (V/m)calculated measured

difference H-field values (A/m)calculated measured

difference

D.5.1 thick 813.5 192 171 -10.94% 0.4842 0.4597 -5.06%

D.5.1 thick 835 185 185.9 -0.49% 0.4703 0.4692 -0.234%

D.5.1 thick 898.5 187 - - 0.4822 - -

D.5.1 thick 1880 150 156.2 4.13% 0.4584 0.4433 -3.29%

D.5.1 planar 813.5 257.2 211.9 -17.6% 0.57 0.497 -12.8%

D.5.1 planar 835 250 213.5 -14.6% 0.5523 0.4987 -9.7%

D.5.1 planar 898.5 248.4 202.7 -18.4% 0.5622 0.4963 -11.7%

D.5.1 planar 1880 182.3 153.4 -15.85% 0.5091 0.4748 -6.7%


Updated Table 4.2 at 15 mm with measurement results

Table 4.2 – Illustrated dipole calculated and measured values

Dipole Freq.(MHz)

E-field values (V/m)calculated measured

difference H-field values (A/m)calculated measured

difference

D.5.1 thick 813.5 127 108.3 -14.72% 0.349 0.3146 -9.86%

D.5.1 thick 835 122 116.6 -4.43% 0.339 0.3253 -4.04%

D.5.1 thick 898.5 123 - - 0.348 - -

D.5.1 thick 1880 98 96.1 -1.94% 0.334 0.3192 -4.43%

D.5.1 planar 813.5 156.3 131.1 -16.12% 0.39 0.3391 -13.05%

D.5.1 planar 835 151.5 131.5 -13.20% 0.3787 0.3412 -9.90%

D.5.1 planar 898.5 150.2 126.4 -15.85% 0.3853 0.3423 -11.16%

D.5.1 planar 1880 106.8 93.05 -12.87% 0.3475 0.3289 -5.35%


Conclusion

• ‘Planar dipole’ FDTD simulations need to be repeated with the correct parameters.

• The following sections in C63.19-2006 need to be updated with calibration values at 15 mm distance– In Section 4.4:

• Table 4.2– In Annex D:

• Table D.4• Figures D.3 - D.4, D.10• Equations D.1 & D.2• Include ‘Planar dipole’ simulation parameters in section

‘D.5.1.4 Dipole validation theoretical modeling’.• All of the above tasks can be completed in a time frame of

1-2 months.


Thank you


Table 4.2 at 10 mm


Table D-4 at 10 mm

Jagadish Nadakuduti EME Research Engineer, Motorola, Inc .

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