Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TB4
Session:
Number:3TB4-1
Estimating antenna bandwidth using the bandwidth potential and Q value techniques
Jussi Rahola,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
In many cases the bandwidths of different antennas are compared by simply looking at their S11 curves and determining the bandwidth at a desired matching level. However, this approach may be problematic if the antennas are not matched in the same way. Ideally the antennas under comparison should be tuned and optimized so that the antenna impedance is overcoupled and obtains maximal bandwidth around a desired center frequency. Especially when comparing the effect of different parameters on antenna performance the requirement of optimal overcoupling requires a lot of manual work for each parameter combination. This paper presents two techniques, the Q value technique and the bandwidth potential approach, for estimating the obtainable bandwidth of antennas by using just the antenna impedance data. In both methods implicitly constructed matching circuits are used in the analysis. The methods can easily be applied to non-resonant antennas and can thus be used to select best antenna candidates in term of bandwidth when a parameter sweep is run.