
Frequency characteristics
Push the
Plot
button at the bottom of the optimization window to calculate the
frequency characteristics of the antenna. Make sure that you have
calculated the antenna model at least once before you use this function.
Speculation button: MMANA-GAL calculates the antenna model with a little
frequency offset and speculates the frequency characteristics around the
center frequency. MMANA-GAL uses a linear approximation for R, Ga, and F/B.
MMANA-GAL assumes that the antenna is a serial resonance circuit and
speculates the jX and SWR. MMANA-GAL cannot speculate the far field pattern,
Hi.
All points button: MMANA-GAL calculates the antenna model at all five points
and plots the graph.
Detail button: MMANA-GAL calculates the antenna model at intermediate
frequencies as well as the grid points. This is useful for obtaining the
antenna characteristics in the wide frequency range. The number of
intermediate points can be set in the property window.
Resonance button: MMANA-GAL first calculates the resonance frequency of the
antenna and shows the Fo in the Z graph. Care should be taken that it
takes substantial time for the calculation if you put the frequency that
is very far from the resonance frequency.
Setup: You can calculate the antenna model having
a matching circuit. MMANA-GAL assumes that the matching section is composed
of no-loss lumped-constant LC circuit. If you turn it on, MMANA-GAL always
supposes a perfect matching circuit is attached.
It should be noted that these values are calculated from the jX
transition on the assumption that the antenna is a serial resonance
circuit. Therefore, the values would not be valid for some kinds of
antennas. In addition, the error of them is not small if the frequency
for the calculation is far from the resonance frequency.
The beam pattern chart in the far field page superimposes all the
results. If you want to focus on one of the results, click on the
frequency you want to see, or click on ON field. The results marked
with On are displayed.
Push the Print button to invoke a print dialog box. Z, SWR, and Ga/FB
charts are printed in a sheet. The far filed pattern is not printed. |