User's Manual

FreeStar ZFSM-101-3
Page 4
ABSOLUTE MAXIMUM RATINGS
Rating Value Unit
Power Supply Voltage 3.6 Vdc
RF Input Power +10 dBm
Storage Temperature Range -55 to 125 ºC
RECOMMENDED OPERATING CONDITIONS
Characteristic Min Typ Max Unit
Power Supply Voltage (Vdd) 2.1 3.3 3.6 Vdc
Input Frequency 2405 2480 MHz
Ambient Temperature Range -40 25 85 ºC
Logic Input Low Voltage 0 30% Vdd V
Logic Input High Voltage 70% Vdd Vdd V
FreeStar Modules include an integrated PCB trace antenna. The PCB antenna employs an F-Antenna topology that is com-
pact and supports an omni-directional radiation pattern. To maximize antenna efciency, an adequate ground plane must be
provided on the host PCB.
The following will signicantly contribute to antenna performance:
• The position of the module on the host board
• The position of the ground plane on the host board under the module
• Overall design of product enclosure
Poor design affects radiation patterns and can result in reection, diffraction and/or scattering of the transmitted signal.
The following are a few design guidelines to help ensure antenna performance:
• Never place the ground plane or route copper traces directly underneath the antenna portion of the module
• Never place the antenna close to metallic objects
• In the overall design, ensure that wiring and other components are not placed near the antenna
• Do not place the antenna in a metallic or metallized plastic enclosure
• Keep plastic enclosures 1cm or more from the antenna in any direction
ANTENNA