Triangular plane antenna
A triangular antenna is a transmission antenna stretched between three (often isolated from earth) transmission masts or transmission towers. It is used as a transmitting antenna for long and medium wave and consists either of three T-antennas, which are stretched between the antenna supports in the form of a triangle, or of a wire that is insulated in the form of a triangle and suspended from the tower tops, on the radially to the center of the triangle Leading wires are attached to which the feed line ends. The former design is preferred for medium wave, the latter mostly used for long wave. In contrast to self-radiating transmission masts, triangular antennae are very broadband and can be used for several transmission frequencies without major conversion measures. Triangular antennas were available for all large transmitters for long and medium wave in the former GDR, at least in a simple version as a reserve antenna (sometimes also as an operational antenna for a transmitter with lower power), the mast height for medium wave being approx. 50 meters and for long wave approx. 150 meters . At some locations, these antennas are still available today and in working order.
A special type of triangular antenna was used for the Eiffel Tower transmitter in the first half of the 20th century . Here the tip of the Eiffel Tower formed one side of the triangle, while the other anchoring points formed two ropes anchored on the Martian field.
literature
- Communication technology part 1 Basics of radio frequency. 1st edition, Institute for the Development of Modern Teaching Methods e. V., Bremen, 1980
- The big book of technology. Publishing house for knowledge and education, Bertelsmann GmbH publishing group, Gütersloh, 1972