Manuals / Telit Wireless Solutions / Computer Equipment / Network Card

Telit Wireless Solutions GE863-PY, GE863-QUAD manual GSM Antenna Requirements

Models: GE863-QUAD GE863-PY

1 79

Download 79 pages 15.11 Kb

Page 22

GE863-QUADGE863-PY1vv0300715 Rev. 1 - 19/09/06

5 Antenna

The antenna connection and board layout design are the most important part in the full product design and they strongly reflect on the product overall performances, hence read carefully and follow the requirements and the guidelines for a proper design.

5.1 GSM Antenna Requirements

As suggested on the Product Description the antenna and antenna line on PCB for a Telit GE863- QUAD/PY device shall fulfil the following requirements:

	ANTENNA REQUIREMENTS

Frequency range		Standard Dual Band GSM/DCS frequency
		range or
		Standard Quad Band GSM/DCS/PCS
		frequency range if used for all four bands
Bandwidth		80 MHz in GSM900, 70MHz in GSM850 &
		170 MHz in DCS & 140 MHz PCS band
Gain		Gain < 3dBi
Impedance		50 ohm
Input power		> 2 W peak power
VSWR absolute		<= 10:1
max
VSWR		<= 2:1
recommended

When using the Telit GE863-QUAD/PY, since there's no antenna connector on the module, the antenna must be connected to the GE863-QUAD/PY through the PCB with the antenna pad.

In the case that the antenna is not directly developed on the same PCB, hence directly connected at the antenna pad of the GE863-QUAD/PY, then a PCB line is needed in order to connect with it or with its connector.

This line of transmission shall fulfil the following requirements:

ANTENNA LINE ON PCB REQUIREMENTS

Impedance	50 ohm
Max Attenuation	0,3 dB

No coupling with other signals allowed

Cold End (Ground Plane) of antenna shall be equipotential to the GE863-QUAD/PY ground pins

Furthermore if the device is developed for the US market and/or Canada market, it shall comply to the FCC and/or IC approval requirements:

Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved

page 22 of 79

Image 22

Telit Wireless Solutions GE863-PY, GE863-QUAD manual GSM Antenna Requirements

Contents

GE863-QUAD GE863-PY Hardware User Guide Contents 10.3 10.110.2 10.413.1 12.113.2 This document is relating to the following products Overview GE863 module connections PIN-OUTPin Signal Function Internal Type Pull up Pin Signal Function Internal Type Pins Layout Hardware Commands Turning on the GE863-QUAD/PYTurning OFF the GE863-QUAD/PY Turning off of the device can be done in two waysHardware Unconditional Reboot Hardware shutdownGE863-QUAD 1Power Supply Requirements Power SupplyGE863-QUAD/PY power requirements are 2General Design Rules Electrical design Guidelines1.2 + 12V input Source Power Supply Design Guidelines An example of linear regulator with 5V input isBattery Source Power Supply Design Guidelines An example of switching regulator with 12V input isBattery Charge control Circuitry Design Guidelines Thermal Design Guidelines Power Supply PCB layout Guidelines Antenna GSM Antenna RequirementsSerial Ports GSM Antenna installation GuidelinesGSM Antenna PCB line Guidelines Absolute Maximum Ratings -Not Functional Parameter Min Max Level Min Max17-28-36 Ground 45-48-50-56 Signals in the Uart connector on the EVK areNumber Pad Number Clear to Send Output from the GE863-QUAD/PY that2MODEM Serial Port 2 Python Debug It is available on the following pins3RS232 level translation An example of level translation circuitry of this kind is 5V Uart level translation GE863-QUAD Audio Section Overview GM863-GPS Echo canceller type Car kit hands-free Microphone Paths Characteristic and RequirementsEcho canceller type Handset + 20dBThat means You can set GA= +20dB to use standard resistor valuesTIP environment consideration General Design Rules Other considerationsMicrophone Biasing Balanced Microphone BiasingUnbalanced Microphone Biasing GE863-QUAD Buffered Balanced Mic Microphone BufferingSample circuit can be Gain = RR604605 = RR607606 Buffer gain is given by the formulaBuffered Unbalanced Single Ended Microphone Freq . = 2π * R719* C726 2π * R711* C727 Buffer bandwidth at -3dB shall be 4KHzGE863-QUAD Output Lines Speaker Short descriptionOutput Lines Characteristics SW volume level step Number of SW volume stepsNoise Filtering Handset Earphone Design Hands-Free Earphone Low Power Design An example of internal Ear amplifier could beCar Kit Speakerphone Design Evaluation Kit for Telit Modules EVK2 Short Description2 EVK2 Audio Lines Characteristics @ 350mWData Integrity ESDSchematic SIM SupplyLayout Using a Gpio Pad as Output Using a Gpio Pad as InputGeneral Purpose I/O 10.3Using the Alarm Output GPIO6 Using the Buzzer Output GPIO7Description DAC and ADC section11.1DAC Converter Min Max UnitsEnabling DAC An AT command is available to use the DAC functionCommand is AT#DAC=enable,value Low Pass Filter ExampleInput Voltage range AD conversion Bits Resolution Using ADC Converter11.2ADC Converter Type Camera12.1Transchip Camera Sensitivity LuxCamera Interface Connectors Camera Physical Detail & Connector Camera Socket Connector Camera Board Module Main Block Diagram for supported cameras Schematic Diagrams for supported camera Example usage script for camera Camera setting shown here are the defaults onesTaking an reading a photo Mounting the GE863-QUAD / PY on the Application Board 13.2Module Finishing & Dimensions13.1General Surface finishing Ni/Au for all test pads Lead-free AlloyRecommended foot print for the application Stencil Debug of the GE863 in ProductionPCB pad Design Solder paste 13.2.6 GE863-QUAD / PY Solder Reflow Following is the recommended solder reflow profileGE863-QUAD Packing System Section A-AModules orientation on tray Moisture Sensibility Conformity Assessment Issues Safety Recommandations 21/02/06 Document Change LogRevision Date Changes 19/09/06