RF Signal RF Signal Wireless Test LabWireless Test Lab

Weekly Report 1:Weekly Report 1:

Objective:Objective:

Familiarize all group Familiarize all group members with RF members with RF wireless transmission wireless transmission capabilities and capabilities and components. components.

RF Signal Wireless Test RF Signal Wireless Test LabLab

We met with Graduate Research Assistants and We met with Graduate Research Assistants and discussed possible objectives as to how we can discussed possible objectives as to how we can enhance certain concepts of the original design.enhance certain concepts of the original design.

Researched devices such as Mixers, Filters, Researched devices such as Mixers, Filters, Circuit Designs, Oscillators, Amplifliers, and RF Circuit Designs, Oscillators, Amplifliers, and RF Signal Generators for Base Band FrequencySignal Generators for Base Band Frequency

Familiarize ourselves with the actual design and Familiarize ourselves with the actual design and breakdown the frequency receiver/transmitter breakdown the frequency receiver/transmitter capabilities for the 900 MHz and 2.4 GHz capabilities for the 900 MHz and 2.4 GHz frequency signals.frequency signals.

Arranged lab access hours with Graduate Arranged lab access hours with Graduate Research Assistants for further weekly meetings.Research Assistants for further weekly meetings.

RF Signal Wireless Test LabRF Signal Wireless Test Lab

TRANSMITTER

Carriercircuits

Signalprocessing

Transmissionmedium

(channel)

s(t)

RECEIVER

Carriercircuits

Signalprocessing

r(t)

Informationinput

m(t)m(t)~

To informationsink (user)

There are 3 basic elements to every communication system:

Transmitter: converts the message signal produced by the source of information into a form suitable for transmission over the channel.

Channel: physical medium that connects the transmitter and receiver.

Receiver: operates on the received signal so as to reconstruct a recognizable form of the original message signal.

RF Signal Wireless Test RF Signal Wireless Test LabLab

FrequencyBand

0.3-3 GHz

3-30 GHz

Designation

Ultrahigh Frequency(UHF)

Superhigh Frequency(SHF)

PropagationCharacteristics

LOS propagation, cosmic noise

LOS propagation; rainfall attenuation above 10 GHz, atmospheric attenuation because of oxygen and water vapor, high water vapor absorption at 22.2 GHz

Typical Users

VHF television, FM two-way radio, AM aircraft communication, aircraft navigational aids

UHF television, cellular telephone, navigational aids, radar, GPS, microwave links, personal communication systems

RF Signal Wireless Test RF Signal Wireless Test LabLab

Amplifier: enhances current signal to allow stronger Amplifier: enhances current signal to allow stronger frequency frequency

Filter (low-pass): bypass unwanted high-frequency Filter (low-pass): bypass unwanted high-frequency signals signals

Mixer – combine both base band and oscillated Mixer – combine both base band and oscillated frequency signals into one frequency signals into one

Oscillator – generates frequency signal for a Oscillator – generates frequency signal for a determined valuedetermined value

Signal Generator – provides base band frequency Signal Generator – provides base band frequency through an external medianthrough an external median

RF Signal Wireless Test RF Signal Wireless Test LabLab

RF Signal Wireless Test RF Signal Wireless Test LabLab

Current Design is able to transmit a Current Design is able to transmit a 900 Mhz and 2.4 MHz frequency 900 Mhz and 2.4 MHz frequency

The 5.7 MHz transmission capability The 5.7 MHz transmission capability has been redesigned due to excessive has been redesigned due to excessive voltage provided by power voltage provided by power generator/splittergenerator/splitter

Efficient in providing consistent results Efficient in providing consistent results for given frequency capabilitiesfor given frequency capabilities

RF Signal Wireless Test RF Signal Wireless Test LabLab

Take the current design layout for the Take the current design layout for the 900Mhz and 2.4 GHz transmission rate and 900Mhz and 2.4 GHz transmission rate and redesign platform onto a PCB( printed redesign platform onto a PCB( printed circuit board )circuit board )

Modifying current 5.7 GHz Modifying current 5.7 GHz transmitter/receiver design onto new modeltransmitter/receiver design onto new model

Find a constructive Application process for Find a constructive Application process for the given frequencies once implemented the given frequencies once implemented onto PCBonto PCB

RF Signal Wireless Test RF Signal Wireless Test LabLab

We will have a finished layout of website We will have a finished layout of website where all presentations, progress reports, where all presentations, progress reports, and research papers will be available for and research papers will be available for viewingviewing

Test the 5.7 GHz frequency design to see Test the 5.7 GHz frequency design to see what improvements can be made what improvements can be made

Start researching components for proposed Start researching components for proposed PCB modelPCB model