Premium
Study of distributions of modes and plane waves in reverberation chambers for the characterization of antennas in a multipath environment
Author(s) -
Rosengren Kent,
Kildal PerSimon
Publication year - 2001
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.1323
Subject(s) - electromagnetic reverberation chamber , microwave , optics , multipath propagation , plane (geometry) , physics , plane wave , frequency band , acoustics , mode (computer interface) , azimuth , reverberation , geometry , engineering , antenna (radio) , mathematics , electrical engineering , computer science , channel (broadcasting) , quantum mechanics , operating system
A rectangular metallic cavity is known to support a number of resonant cavity modes. Each of these modes can be described as a sum of eight plane waves incident from different angles. This paper studies how these plane waves are angularly distributed in space, which is of interest when the cavity is used to simulate multipath environment. The results show that the angular distribution in space is uniform provided that the three linear dimensions of the chamber are sufficiently large, and do not deviate too much from each other. As an example, two rectangular cavities with dimensions 1 m×0.8 m×1 m and 5.5 m×2.5 m×3.5 m are analyzed in detail, and are shown to have uniform plane‐wave distributions. We also demonstrate how the chamber geometry may be chosen in order to weight the angular plane‐wave distribution in the elevation plane. A result of the study is that we detect a 25 MHz frequency band with very few modes in a small chamber designed for use with reduced accuracy in the GSM 900 MHz band. We also propose how this chamber can be modified to obtain uniform mode distribution over this frequency band. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 386–391, 2001.