Three-element ZYGI BEAM. Scheme, description

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Three-element ZYGI BEAM. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / HF antennas

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Radio amateur G3PTN developed a two-element antenna design, which he called "Zygl-beam". It is an active powered antenna. Both elements are made in the form of open rectangles located in the same plane.

As a result of experiments to increase the efficiency of the antenna, the author developed its three-element version, the circuit of which (for the 14 MHz band) is shown in the figure. The three-element "Zygi-beam", according to the author, has a higher front-to-back ratio (up to 20 dB) and a higher gain (up to 65 dB). The input impedance of the active vibrator is XNUMX ohms.

Three-piece ZYGI BEAM

As the third element, a passive reflector is used, shortened with the help of two inductors (for the range of 14 MHz, the resonant frequency of the reflector is 13,6 MHz). Each coil is wound on a frame with a diameter of 19 mm and a length of 100 mm and consists of 56 turns of wire with a diameter of 1,2 mm, winding - turn to turn.

A 75-ohm coaxial cable with a balancing transformer was used as the antenna feeder. The author recommends tuning the antenna in two stages. First set up active elements, then add a reflector. Using a horizontally polarized signal (such as a local amateur radio signal), the best front-to-back ratio of emissions is achieved by adjusting the length of the reflector. Having adjusted the reflector, the element B is tuned to a frequency equal to approximately 15,35 MHz. In this case, the forward-backward ratio of radiation should increase. In conclusion, the correctness of the setting of the L element is checked by removing the dependence of the SWR on the frequency within the range.

The tuning of the active elements of the antenna should be carried out according to the method described in "Radio", 1975, No. 8, p.

Literature

"Radio Communication" (England), 1975, No. 10

Publication: N. Bolshakov, rf.atnn.ru

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