A NECHOIC C HAMBER System Design Review 10/14/2011.

ANECHOIC CHAMBERSystem Design Review 10/14/2011

PROJECT OVERVIEW

Designed for 2-4 GHz

To be used by future senior design teams

Easy to use Robust

Three antennas designed and built

One Wideband Antenna

One High Gain Antenna

One Reduced Size Antenna

Anechoic Chamber Test antennas

PROJECT PLAN

Assembly Isolation testing Isolation

improvements and final test

Design Cutting/ scaling/

purchasing Application Quiet zone testing Final review/design

edits

Phase I- Chamber Design Phase II- Absorber

PROJECT PLAN (CONT.)

Design Arm construction Slider construction Motor/Housing

construction Control system

housing construction Wiring and

insolation

System Level Design GUI LabView control

level Microcontroller level Interface

Phase III – Rx antenna mount

Phase IV – Control System

PROJECT PLAN (CONT.)

Design Construction Testing

Final tests Calibration Documentation of

chamber properties User’s manuel

Phase V – Antennas Phase VI – Final review and testing

KEY RISKS

Standard gain reading can not be taken Calibration sequence does not accurately

apply offset so readings are wrong Chamber is too complicated for someone

without RF background to use Absorber is not placed correctly and allows

for reflections

CUSTOMER NEEDS

CUSTOMER SPECIFICATIONS

FUNCTIONAL DIAGRAM

ANTENNA MOUNT DESIGN

SLIDER DESIGN

ANTENNA SELECTION

Antenna Type Price Freq Range Gain Horizonal

AngleVertical Angle Height (Diameter) Width Depth Far Field Distance

GHz dB Degrees Degrees in cm in cm in cm m feet

1Standard

Gain Horn

3745 1.7-2.6 16.3 27 27 25.25 64.14 13.64 34.65 25.25 64.14 8.50 30.22

2 Octave Horn 5510 2-4 17.5 22 22 9.12 23.17 13.63 34.61 23.37 59.34 4.63 15.18

3 Parabolic Grid 37-53 2.4-2.5 15 16 21 15.7 40 11.8 30 10.4 26.3 1.62 5.33

4 Parabolic Grid 48-60 2.4-2.5 19 12 16 23.6 60 15.7 40 10.4 26.3 6.81 22.34

5 Backfire Dish 36 2.4-2.5 14 25 25 (10.25) (26) - - 0.34 1.12

LABVIEW FUNCTION FLOW CHARTstart

Choose type cut (180 or 360)

Choose Resolution Fine or very Fine

Send signal to micro controller

Micro Controller run initialization code lab view acquire a signal from the micro

controller via DAC

Start the data collection and store the values in a Matrix

Lab View dialogue box alerting the user to set the certain parameters

Check to see if the choosed type cut is finished

Save Matrix

Allow user to choose the appropriate scale for plot

Plot Graph

Dialogue box alerting the user to save Plot

End

Yes

NO

Send signal to Micro Controller prompting it to turn

Acquire signal from micro controller after trun

LABVIEW FRONT PANEL / INTERFACE

LABVIEW INTERFACE FIRST STAGE

LABVIEW INTERFACE SECOND STAGE

LABVIEW INTERFACE THIRD STAGE

CONTROL SYSTEM DIAGRAM

Linear flow Micro Controller

interfaces with LabView

Reset option for users to stop program mid-execution

When normal execution completes, exports all data to a text file to be used with programs such as Matlab

MOTOR SYSTEM DIAGRAM