ANTENTOP- 01- 2007, # 009

BA- Butterfly Antenna

By: N. Filenko, UA9XBI, ua9xbi@online.ru

Credit Line: www.cqham.ru

The antenna is a version of a shunt fed loop (Reference 1). However, the antenna has some advantage compare to a version from Reference 1.

1. Input impedance is closed to 50 Ohm.
2. The antenna has more narrow diagram directivity.
3. Easy to installation. It could be hanged between trees, trees and house, etc.

Figure 1 shows the antenna at a horizontal installation. Figure 2 shows the diagram directivity of the antenna at its height 5 meters over real ground. Mostly vertical polarization is at the installation. Figure 3 shows the SWR the antenna at its height 5 meters over real ground. Figure 4 shows input impedance the antenna at its height 5 meters over real ground. The plots were taken with help of MMANA (Reference 2).

UA9XBI

Radio club "Arktika" Championship 2004

Photo Credit Line:

http://www.arktika.komi.com/Champ_2004.htm

Figure 1 Butterfly Antenna at Horizontal Installation

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