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MICROWAVE BRIDGE USED TO MEASURE THE PHASE CHANGE
A SECOND MICROWAVE BPIDGE USED TO MEASURE PHASE
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15db attenuation 20db directional coupler 60 mega hertz attenuation constant attenuation due attenuation reading attenuator under test calibrate the attenuator calibrating an attenuator card is absorbed Card Type Attenuator card unattenuated center resistive card changed alternately Chapter circular waveguide crystal detector cumulative error D.C. signal dielectric slab differed by 60 differential voltmeter dot product frequency drifting hertz sine wave incoming signal input signal Klystron local oscillator lOdb Low Attenuation Range magic tee Microwave Bridge microwave signal microwave source middle card mixer modulated signal multiple reflections null was obtained Odb to 15db output end Perturbed Waveguide phase angle phase constant phase shift associated phase shift error phasors rectangular waveguide reflection coefficient Resistive Card Type rotary vane attenuator rotary vane type second method sharp null shown in Fig signal in arm signal passes step of 2db switch SW SWR meter TE^q Mode vane type attenuator variable attenuator variable phase shifter