Title :
Influence of calibration loads structure on emissivity at millimeter-wave lengths
Author :
Li, Zhiping ; Liu, Dawei ; Bai, Ming ; Miao, Jungang ; Li, Xuan
Author_Institution :
Electromagn. Lab., Beihang Univ., Beijing, China
Abstract :
By using the three-dimensional finite-difference time-domain (FDTD) algorithm, we investigated the optimal structure parameters of pyramidal arrays used for millimeter-wave radiometer calibration. The arrays are constructed with a periodically arranged metallic pyramids which are coated with absorbing materials. In considering the difficulties in manufacturing the sharp tips of the pyramids, we investigated the effect of two other tip shapes: flat and semi-spheric. We found that the absorbing performance of the pyramidal array with semi-spheric tips is about 10dB higher than that with flat tips.
Keywords :
absorbing media; emissivity; finite difference time-domain analysis; millimetre wave devices; radiometers; absorbing material; calibration load structure; emissivity; flat tips shape; millimeter-wave length; millimeter-wave radiometer calibration; optimal structure parameters; pyramid sharp tips manufacturing; pyramidal array; semispheric tips shape; three-dimensional finite-difference time-domain algorithm; Calibration; Finite difference methods; Materials; Microwave radiometry; Microwave theory and techniques; Shape; Time domain analysis; FDTD; calibration target; emissivity; pyramid array;
Conference_Titel :
Microwave, Antenna, Propagation, and EMC Technologies for Wireless Communications (MAPE), 2011 IEEE 4th International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-8265-8
DOI :
10.1109/MAPE.2011.6156216
