© TDK Corporation 2018
Product Marketing [Jan 2018] 1
Attracting Tomorrow
ANTENNA DESIGN APPLICATION NOTES
STUDY | SINGLE vs. DUAL BAND
►RHCP RADIATION PATTERN EXAMPLE DATA @1.575GHz
EVALUATION BOARD FOR SINGLE BAND (GPS)
■ ANT016008LCD1575MA1
Dimensions (mm)
L W T
1.60 0.80 0.40
±0.10 ±0.10 Max.
EVALUATION BOARD FOR DUAL BAND (GPS & 2.4GHz)
Antenna Location: Center
Board size: 55 x 15 x 1 mm
2
Antenna keep out area: 15 x 6 mm
2
55mm
15mm
Antenna Location: Center
Board size: 55 x 15 x 1 mm
2
Antenna keep out area: 15 x 6 mm
2
55mm
15mm
Frequency[GHz] 1.574 1.59 1.606 1.574 1.59 1.606
VSWR 1.38 1.36 1.89 1.76 1.14 2.01
Total Efficiency[dB] -1.01 -0.91 -1.18 -1.83 -1.27 -1.59
Model-1
Model-2
Frequency[GHz] 2.4 2.442 2.485
VSWR 1.50 1.47 1.64
Total Efficiency[dB] -1.49 -1.50 -1.64
Model-2
VSWR & EFFICIENCY (SIMULATION RESULTS)
GPS + GLONASS BAND
2.4GHz ISM BAND
Model-1 Model-2
Z-X cut -2.1 -2.8
Z-Y cut -5.2 -5.8
Total -3.4 -4.1
Unit: dBic
Model-1 Model-2
Average[dBic] -2.10 -2.83
Maximum[dBic] -1.16 -1.95
Minimum[dBic] -2.65 -3.42
Model-1 Model-2
Average[dBic] -5.13 -5.76
Maximum[dBic] -2.00 -2.64
Minimum[dBic] -22.79 -23.99
Model-1 Model-2
Average[dBic] -4.55 -5.24
Maximum[dBic] -1.17 -1.95
Minimum[dBic] -12.08 -12.64
Z-axis Direction Upper Hemisphere Average Gain
15 mm
6 mm
15 mm
6 mm
© TDK Corporation 2018
Product Marketing [Jan 2018] 2
Attracting Tomorrow
ANTENNA DESIGN APPLICATION NOTES
STUDY | PCB DIMENSION (Length)
►RHCP RADIATION PATTERN EXAMPLE DATA (MEASUREMENT L= 80mm)
EVALUATION BOARD
■ ANT016008LCD1575MA1
Dimensions (mm)
L W T
1.60 0.80 0.40
±0.10 ±0.10 Max.
TUNING COMPONENTS
Antenna Location: Center
Board size: L x 20 x 1 mm
2
Antenna keep out area: 10 x 6 mm
2
Ft (pF) Mt-1 (pF) Mt-2 (pF)
L = 40mm 3.6 - 1.2
L = 60mm 3.0 0.5 2.0
L = 80mm 4.0 1.5 2.0
L = 100mm 5.0 0.8 2.0
L = 120mm 5.2 0.2 2.0
Frequency
Tuning (Ft)
Impedance
Matching (Mt1)
Impedance
Matching (Mt2)
VSWR & EFFICIENCY (SIMULATION RESULTS)
Item
Frequency(GHz) 1.574 1.575 1.576 1.574 1.575 1.576 1.598 1.602 1.606 1.598 1.602 1.606
L=40mm 2.7 2.6 2.4 -4.6 -4.5 -4.4 1.7 2.1 2.5 -3.5 -3.7 -4.0
L=60mm 1.5 1.5 1.4 -1.1 -1.0 -1.0 1.4 1.5 1.6 -0.9 -0.9 -0.9
L=80mm 1.3 1.3 1.3 -0.5 -0.5 -0.5 1.4 1.4 1.4 -0.5 -0.5 -0.5
L=100mm 1.3 1.3 1.3 -0.8 -0.8 -0.8 1.3 1.4 1.4 -0.8 -0.8 -0.8
L=120mm 1.5 1.5 1.4 -1.3 -1.3 -1.3 1.2 1.3 1.5 -1.1 -1.2 -1.2
VSWR
Efficiency
VSWR
Efficiency
GPS band
Glonass band
1.575GHz 1.602GHz
Average[dBic] -1.2 -1.2
Maximum[dBic] -0.1 -0.1
Minimum[dBic] -2.8 -2.9
1.575GHz 1.602GHz
Average[dBic] -4.5 -4.5
Maximum[dBic] -1.1 -1.1
Minimum[dBic] -16.7 -16.5
1.575GHz 1.602GHz
Average[dBic] -4.5 -4.5
Maximum[dBic] -0.1 -0.1
Minimum[dBic] -34.5 -36.9
L mm
20mm
10 mm
6 mm