Design of Input and Output Couplers for Ku-band 140Watts Spa

JasonYoo

Design of Input and Output Couplers for Ku-band 140Watts Spa [复制链接]

Input and output couplers, as shown in Pigs .1&2, have been designed for Ku-band 140 W TWT with
minimum reflection and transmission loss over the desired frequency range of 10.9 to 11.7 GHz. The
software package Ansoft HFSS version 8.5 was used to simulate the coupler terminated with the
actual helix slow wave structure {SWS). The SWS is a tungsten tape helix, which is supported inside
the metallic barrel assembly using three rectangular shaped APBN support rods at 120 degrees. The
dimensions of the helix SWS are: tape width 0.375mm, tape thickness 0.175nun, helix pitch 0.54mm
for input and 0.495mm For output. The barrel diameter is 5.0 mm and support rods are in two steps of
width 0.4mm and 0.8mm. Five helix turns were used for simulation, as the results were found
consistent with more number of helix turns that leads to more computational time.