RU1815701C - Antenna with elliptic polarization - Google Patents

Abstract

Usage: the invention relates to antenna technology and can be used to expand the range of operating frequencies, protruding cavity antennas. SUMMARY OF THE INVENTION: A symmetrical half-wave vibrator is placed in the plane of the screen behind a quarter-wave diamond-shaped cavity. The side of the rhombus is 0.7 ± 0.05 of the average working wavelength, the angle between the sides is 45 °, the angle between the smaller diagonal of the rhombus and the vibrator is 55 ± 5 °. 3 ill.

Description

The invention relates to radio engineering, and more particularly, to antennas for receiving or emitting electromagnetic waves of elliptical polarization.

An object of the invention is to expand the operating frequency range.

Figure 1 shows the proposed elliptical polarization antenna; figure 2 - graphs of the frequency dependence of the VSWR antenna of the prototype (2A) and the proposed antenna (26); in Fig. 3 - graphs of the frequency dependence of the coefficient Kz of the ellipticity of the antenna of the prototype (Over) and the proposed antenna (36) ..

The proposed elliptical polarization antenna contains (see FIG. 1), a cavity 1 with a depth of a quarter of the average length A Cp of the working wave located in the metal screen 2, and a symmetrical half-wave vibrator 3. The cavity 1 is made in the form of a rhombus from the side (0.7 ± 0.05)

Der and angle of 45 °. The symmetric half-wave vibrator 3 is located in the plane of the screen 2 above the center of the cavity 1 at an angle of 55 ± 5 ° to the small diagonal of the cavity 1.

The principle of operation of the antenna is as follows. The signal from the output of the transmitter (not shown) is fed to the input of the vibrator 3. Under the influence of the currents flowing in the arms of the vibrator 3, cavity 1 is excited and an electromagnetic field is created in the space surrounding the antenna, which is a superposition of the cavity field 1, the current field field 2 and the vibrator field 3. The proposed arrangement of the vibrator 3 in the cavity 1, as well as the proposed shape and dimensions of the cavity 1 provide elliptical polarization of the electromagnetic field prs while expanding the operating frequency range.

On figb, 36 shows graphs of the frequency dependences of the SWR n and the coefficient K e of the ellipticity of the proposed antenna w

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liptic polarization. The graphs show that the operating frequency range of the proposed antenna in terms of the ellipticity coefficient is 50%, which is significantly larger than the corresponding operating frequency range of the antenna of the prototype, the characteristics of which are shown in Fig. 2a, 3a. The graphs in Figures 2a, b and 3a. B are obtained experimentally under the same excitation conditions using the same linear symmetric half-wave vibrator (to ensure the correctness of the comparative evaluation of the antennas) at frequencies (1-2) GHz.

The range of operating frequencies in the proposed elliptical polarization antenna can be further increased by using wider half-wave vibrators, for example, loop ones.

Claims (1)

The claims An elliptical polarization antenna containing a screen, a cavity with a depth of a quarter of the average working wavelength, performed in the screen, is symmetrical a half-wave vibrator located in the plane of the screen above the center of the cavity, which means that, in order to expand the operating frequency range, the cavity has a diamond shape with the side OJiO.05 the length of the average working wave and an angle of 45 °, and a symmetrical half-wave vibrator is located at an angle of 55 ± 5 ° to the small diagonal of the rhombus. YU 1.0 1.2 Ma.cff, t 6 fit /. , # Z, about GHz -t-i-i-i-i .. -3. /. Is e f-7 8 1-9 - ° TV fug.z Compiled by Y. Borodovsky Tehred M. Morgenthal Corrector A. Obruchar