ANTENTOP- 01- 2015 # 019

Dipole Antenna for 40- and 20- meter Bands

In my case changing length B on to 1- cm caused changing resonance frequency of the antenna up to 100- kHz at the 40- meter Band. Figure 2 shows SWR of the antenna from 5 to 19.5- MHz. The plot was taken with VNA N2PK.

Figure 3 shows SWR of the antenna at the 40- meter Band. Figure 4 shows SWR of the antenna at the 20- meter Band. SWR was taken at the end of the coaxial cable going from antenna. The program Zplots where the VNA is working has function to remove length of cable (going to antenna) from the antenna measurements.

Figure 5 shows SWR of the antenna from 5 to 19.5- MHz with turned on function "remove coaxial cable length." As you can see the plot at the bands of the interest is practically identical to plot shown at Figure 2.

The MMANA file of the Dipole Antenna for 40- and 20- meter Bands may be loaded: http: // www.antentop.org/019/dl1ba_dipole_019.htm

The file was prepared by RW4HFN. Simulation the Dipole Antenna for 40- and 20- meter Bands in MMANA shows very close theoretical parameters of the antenna to practical obtained ones.

Figure 4 SWR of the Dipole Antenna for 40- and 20- meter Bands at the 20- meter Band

Figure 5 SWR of the Dipole Antenna for 40- and 20- meter Bands from 5 to 19.5- MHz with turned on function "remove coaxial cable length"

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