Note by VA3ZNW: MMANA does not provide correct simulation
when elements of the antenna aerial are located close to the ground.
NEC- 2 for MMANA should be used in the situation. So by me the antenna
was simulated in NEC- 2 for MMANA.
Figure 7 shows the diagram directivity and data for the antenna.
Input impedance is near 21 Ohm, capacitor should be had 132-pF. For matching the antenna with 50-Ohm coaxial
cable an inductor 0.9 micro Henry should be turn on across antenna
clips, and base capacitor C should be used on to 100-pF. Off course,
the real capacity should be found at tuning of the antenna.
Figure 8 shows the circuit of this matching device.
Figure 9 shows parameters of the antenna depending on ground,
above which the antenna is located. As you can see, the ground
does not influence much to the parameters of the antenna. So,
the antenna can be placed above any ground.
land (Eps=12, Sigma=7.5)
rich (Eps=14, Sigma=10)
16. Very good (Eps=20,