Read an article named "A Lumped Circuit for Wideband Impedance Matching of a Non-Resonant, Short Dipole or Monopole Antenna", this article suggested a 5-elements wideband matching network with some both low pass and high pass sections and so it say it's a wideband matching network.
Then I trying to apply this circuit to 27.0MHz band, and a python code is made to randomly guess the 5 component values and evaluate the performance by calculating the reflection coefficient at 5 frequency point around 27.0MHz. After millions cycles of guess, this is the best result I can get.
L1 : 4.04e-06
L2 : 2.918e-07
C1 : 2.247e-11
L3 : 7.131e-07
C2 : 2.312e-11
These value is put into Agilent ADS to verify. With reflection magnitude plot and smith chart plot.
The green plot is the baseline reference matching result using simple 1-element matching and the blue plot is from the 5-element. The 5-element matching network appeared having a wider bandwidth compare to that of 1-element network.
Promising.
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