PA.25A Taoglas Limited, PA.25A Datasheet - Page 17

• Manufacturer Part Number: PA.25A
• Description: ANTENNA 6-BAND SMT
• Manufacturer: Taoglas Limited

Specifications of PA.25A

• Antenna Type: Chip
• Number Of Bands: 6
• Frequency: 824MHz ~ 960MHz, 1.7GHz ~ 2.17GHz
• Vswr: 3
• Gain: 1.76dBi, 4.62dBi
• Termination: Surface Mount
• Mounting Type: Surface Mount
• Height (max): 5mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 931-1060-2

The matching component in a device we recommend starting with a 2.2 nH for short ground
planes (45-75 mm) and 6.8 nH for larger ground planes (80-100 mm). The inductor is strictly
required in the antenna integration (this lumped element is consider as part of the antenna).
Is not possible to determine if further improvement in matching is necessary for a PCB in
specific, but we recommend incorporating in the design extra spaces for a “pi” network in
between the GSM module and the edge of the ground plane. The starting point will be putting
a 0 ohm resistor in series in the “pi” network (S1) and the required 6.8 nH or 2 nH outside of
the ground plane (L1). With these spaces we have 3 options for matching topologies as in the
next figures:
“pi” matching network
“L” and “Inverted-L” matching network
Further optimization could be done as part of a matching circuit to determine if more
components are necessary in the “pi” network, but ca not be determined before, until we test
the board with the antenna on it.
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