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| AN INVESTIGATION INTO REDUCING AM-PM CONVERSION COEFFICIENT BY THE DOUBLE TAPER HELIX TECHNIQUE |
| Zhou Wen-biao Song Pei-de |
| Institute of electronics; Academia Sinica |
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Abstract The eonversion coefficient of a TWT can be reduced, when it works at under-voltage condition. Therefore if a section of helix which works at under-voltage condition is added to a TWT, the improvement of AM-PM eonversion coefficient can be expected,then a "doubl taper helix technique" is developed.This paper describes the double taper helix technique and presents a small signal design method. The actual TWT which uses the double taper helix proves that it not only raises the electron efficiency, but also improves the AM-PM conversion coefficient. Further experiment shows that this technique has other advantages, such as operation at two or three power levels and good depressed collector characteristics.
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Received: 28 July 1980
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1982, Vol. 4 
