Broadband Vertical Collinear Vertical antenna designed
for 430- MHz Band. The antenna has Diagram Directivity with low-altitude
maxima to the ground. Antenna has passband near 70- MHz at SWR
1.5:1.0. Figure 1
shows design of the Broadband Vertical for 430- MHz Band.
Antenna made from aluminum or copper rod in 3- mm diameter.
Capacitor 0.22- pF may be made structurally. Just thin dielectric-
mika or Teflon between the two vertical vibrators. Antenna
should be places at conductivity surface or have several counterpoises.
The antenna has 200- Ohm input impedance. Such input impedance
may be easy matched at one Band but there are some difficulties
to match such impedance in wide band by simple methods.
|
Figure
2 shows input impedance of the antenna at 430- MHz Band.
Figure 3
shows SWR of the antenna at 430- MHz Band. Figure 4 shows DD of the antenna at 430- MHz Band.
Figure
5 shows input impedance of the antenna at 100- MHz pass
band at 433- MHz central frequency. Figure 6 shows SWR of the antenna at 100- MHz pass
band at 433- MHz central frequency. Figure 7 shows DD of the antenna at 100- MHz pass
band at 433- MHz central frequency.
73! de UR0GT
|