DocumentCode :
980693
Title :
Energy considerations in open and closed waveguides
Author :
Laxpati, S.R. ; Mittra, R.
Author_Institution :
University of Illinois, Urbana, IL, USA
Volume :
13
Issue :
6
fYear :
1965
fDate :
11/1/1965 12:00:00 AM
Firstpage :
883
Lastpage :
890
Abstract :
Energy relations derived for a lossless closed uniform and periodic structure show that the total complex Poynting vector integrated over the cross section is identically zero for the case of an arbitrary complex wave. These results are also applicable to open structures provided certain conditions are satisfied. The application of these results in the field of leaky wave antennas is discussed. Two illustrative examples, those of the sinusoidally modulated reactance surface and the sheath helix, are worked out. It is shown that although the slope of the dispersion curve can no longer be associated with the direction of net power flow, the knowledge of the slope may still be helpful in selecting certain modes for representing a given source.
Keywords :
Waveguides; Aerospace electronics; Attenuation; Helical antennas; Leaky wave antennas; Load flow; Periodic structures; Propagation constant; Reflection; Tensile stress; Waveguide theory;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1965.1138546
Filename :
1138546
Link To Document :
بازگشت