Turnstile antenna

 

(57) Abstract:

The invention relates to antenna technique and can be used for transmitting objects, in particular on television stations. The technical result of the invention is to increase the gain and decrease the lateral radiation turnstile antenna without changing its pattern in the horizontal plane. The antenna contains two perpendicular active vibrator length of 0.5, fed by a current with a phase shift equal to 90oand four passive vibrator length (0,51-0,53) each. Passive vibrators are arranged in parallel above and below each active vibrator on the distance (0.5 to 0.6). With this arrangement, the vibrators according to the numerical calculations confirmed the experimental data, the antenna gain in the direction of maximum radiation increases by 3-4 dB relative to the prototype, and the level of the lateral radiation in the direction of up and down is reduced by at least 5 dB. 3 Il.

The invention relates to antenna technique and can be used for transmitting objects, in particular on television stations.

Known turnstile antenna with Paradise entity is a turnstile antenna [X. Meinke, F. Gundlah. , Radio engineering Handbook. So 1. - M.: State energy publishing, I960. 416; Markov, I., Sazonov, D. M. , Antenna. - M.: Energy, 1975. 528], which consists of two horizontal half-wave dipoles perpendicular to each other, fed by currents with a phase shift equal to 90o.

The disadvantage of this antenna is a low gain and a high level of lateral radiation, due to its design. Under lateral radiation refers to radiation in directions other than horizontal.

The aim of the invention is to increase the gain and decrease the lateral radiation turnstile antenna without changing its pattern in the horizontal plane.

To achieve this objective, it is suggested over and under each vibrator antenna prototype at a distance (0.5 to 0.6), where is the working wavelength, install passive vibrators length (0,51-0,53) (Fig.1).

Comparative analysis with the prototype shows that the claimed antenna differs in that it contains additional passive vibrators located above. Thus, the claimed device acoefficient gain and low side radiation. This allows to make a conclusion on the conformity of the proposed technical solution the criterion of "inventive step".

In Fig.1 shows the proposed antenna. In Fig.2 presents the calculated and experimental radiation pattern of the antenna in the vertical plane (the plane xoz or yoz) d = 0,5. In Fig.3 shows the calculated radiation pattern in the horizontal plane (the plane HOU) antenna prototype and the proposed antenna with the same value of d. Pattern coincide with graphic accuracy.

The antenna contains two perpendicular active vibrator length of 0.5, fed by a current with a phase shift equal to 90oand four passive vibrator length (0,51-0,53) each. Passive vibrators are arranged in parallel above and below each active vibrator on the distance (0.5 to 0.6) from them. With this arrangement, the vibrators according to the numerical calculations confirmed the experimental data, the antenna gain in the direction of maximum radiation increases by 3-4 dB relative to the antenna prototype, and the level of the lateral radiation in the direction of "up" and "down" decreases by at least 5 dB.

The device operates as follows. When wosb is that along with the currents on the active vibrators also radiate into the surrounding space. When the selected geometric dimensions, the addition of tension fields from each vibrator is such that in the horizontal plane fields are added in ratios close to in-phase and in the directions "up" and "down" largely offset each other.

The effectiveness of the invention is that by using passive elements is increased gain and reduced lateral radiation turnstile antenna. The proposed antenna can be widely used in network TV repeaters.

Turnstile antenna for transmitting objects with horizontal polarization, containing two perpendicular active vibrator and characterized in that to increase the gain and decrease the lateral radiation above and below the active half-wave vibrators and parallel them at a distance (0.5 to 0.6) are four passive vibrator length (0,51-0,53), where is the working wavelength.

 

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