TITLE:
The Effect of High Power at Microwave Frequencies on the Linearity of Non-Polar Dielectrics in Space RF component
AUTHORS:
Tawfik Elsayed Khattab
KEYWORDS:
Passive Intermodulation, PIM, Nonlinear, Polar Dielectric, Harmonics, Cavity Resonator
JOURNAL NAME:
International Journal of Communications, Network and System Sciences,
Vol.8 No.2,
February
28,
2015
ABSTRACT: In satellite communication systems, there are high power multichannel transmitters and wideband receivers that have shared RF antenna transmission lines because of: 1) large power level difference between the transmitted and received signal; 2) limited frequency channels. The harmonics and Passive Intermodulation (PIM) Interference will be generated due to passive non-linearities in the high power transmission path. This can be a serious problem. This paper describes how to determine the signal levels and dominant mechanisms that are associated with non-linear dielectric behavior in this context. A novel measurement system for testing dielectric samples is described and measurement results are provided for commonly used microwave dielectrics.