filter retuning demo spx [compatibility mode]
TRANSCRIPT
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Filter Retuning DemonstrationD i l F ll S RF E i
COMPANY CONFIDENTIAL
GLOBAL INFRASTRUCTURE X PROCESS EQUIPMENT X DIAGNOSTIC TOOLS
1
Daniel Fallon, Sr. RF Engineer
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Filter Tuning
• Retune 150 Watt Filter from ch 42 to ch 30
• Uses Agilent Time Domain Tuning Technique
• Agilent AN1287-8 “Simplified Filter Tuning Using Time Domain”
• Requirements
• VNA with time domain option (8753ES / )EN5071…)
• 7/8” deep socket wrench
• ½” wrench (deep socket preffered)
• 1/16” Allen Wrench
COMPANY CONFIDENTIAL
GLOBAL INFRASTRUCTURE X PROCESS EQUIPMENT X DIAGNOSTIC TOOLS
7/28/2012 2
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Sequence• Capture memory trace of tuned filterp y
• Set frequency of new channel and recalibrate
• Preset all coupling loop depthsPreset all coupling loop depths
• Set input coupling and resonator 1 (each side)
• Rough tune resonators 2 and 3 (each side)• Rough tune resonators 2 and 3 (each side)
• Time domain fine tune res 1 to 3 (each side)
• S21 fine tune cross coupling• S21 fine tune cross coupling
• Time domain fine tune all
F d i fi i hi t h t i /• Frequency domain finishing touches – centering / bandwidth / frequency
• Lock down
COMPANY CONFIDENTIAL
GLOBAL INFRASTRUCTURE X PROCESS EQUIPMENT X DIAGNOSTIC TOOLS
7/28/2012 3
• Lock down
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100/150/200 Watt Filter
COMPANY CONFIDENTIAL 4
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Resonators, Fine matchers and Loops
COMPANY CONFIDENTIAL 5
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Initial Channel Measurement
• Span 30 MHz• Full two Port Cal
COMPANY CONFIDENTIAL 6
Full two Port Cal• Shown with limits – LPTV Stringent Mask
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Coupling Presets
• All coupling loops and Cross coupler position pre-set to height off case from chart
COMPANY CONFIDENTIAL 7
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Coupling Heights
• Cross Coupler Height
• Coupling Loop Height
COMPANY CONFIDENTIAL 8
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Loosen all resonators
COMPANY CONFIDENTIAL 9
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Resonator # 1 and input coupling tune
COMPANY CONFIDENTIAL 10
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Rough In Resonator #2
COMPANY CONFIDENTIAL 11
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Rough In Resonator #3
COMPANY CONFIDENTIAL 12
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Initial Time Domain Tune
COMPANY CONFIDENTIAL 13
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Adjust Cross Coupling
COMPANY CONFIDENTIAL 14
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Bandwidth Adjust
COMPANY CONFIDENTIAL 15
• All loops deeper = wider filter
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Frequency Adjust
COMPANY CONFIDENTIAL 16
• All fine matchers into cavity= tune down
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Fine Tune in Time Domain
• S11 Log Mag display data and memory
COMPANY CONFIDENTIAL 17
S11 Log Mag, display data and memory• Band-pass time domain transform• Start time -20 ns, stop time ~650 ns
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Polar Plot Centering
COMPANY CONFIDENTIAL 18
• Input coupling and resonator 1
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Lock Down Tuned Filter
COMPANY CONFIDENTIAL 19
• Put tuned filter into memory, do one screw at a time
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CONCLUSIONS
• Tuned filter can serve as a template for new channel
• Time domain option on VNA makes tuning much easierTime domain option on VNA makes tuning much easier
• Dielectric offers one time re-tuning with low power filters
COMPANY CONFIDENTIAL 20