RU19967U1 - DIRECTED VERTICAL POLARIZATION ANTENNA WITH COAXIAL MATCHING - Google Patents

Description

Directional antenna of vertical polarization with coaxial matching.

The proposed utility model relates to antenna technology and can be used in VHF and UHF radio communication systems.

From the level of technology I know the directional antenna of vertical polarization 1, consisting of a half wave vibrator fed through a matching U-elbow made of a metal tube with a diameter of 12 mm and a dielectric traverse with a reflector and directors with a diameter of 6 mm. To increase the technological strength, the crosshead is pulled up to the top of the antenna with two stretch marks made of kapron pshur. The disadvantages of this antenna are low wind resistance and the lack of protection of power supply points on the matching U-elbow from environmental influences.

The closest in design and reliability characteristics is a directional antenna of vertical polarization 2, which is chosen as a prototype. It consists of a half-wave vibrator, passing at the base into a closed quarter-wave two-wire line made in the form of two rigidly connected metal rods, as well as an insulated dielectric cap and two dielectric traverses rigidly fixed in the support sleeve. On one of the traverses parallel to the axis of the half-wave vibrator, the metal rod of the reflector is rigidly fixed, on the second traverse the metal rod of the director is similarly mounted. The disadvantages of this antenna include the instability of the operating frequency associated with the insecurity of the upper part of the two-wire quarter-wave line from snow, rain, icing.

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The technical result of the claimed utility model is the elimination of the above drawbacks and the creation of a directional antenna of vertical polarization with coaxial matching with improved operational x) characteristics.

The technical result is achieved in that in a directional antenna of vertical polarization with coaxial matching, the half-wave vibrator and the closed quarter-wave coaxial line are made in the form of a metal rod passing through; it is coaxially inside the metal pin and is rigidly connected to it in the base flange. The ratio of the inner diameter of the quarter-wave metal cylinder to the diameter of the metal rod corresponds to the wave impedance of the power cable, which ensures optimal matching of the antenna with the power supply. To increase the reproducibility of the operating frequency of the antenna, the power cable is connected to the quarter-wave line through a connector mounted on the side of the cylinder opposite the power point. The distance to the power point is selected depending on the antenna tuning frequency and corresponds to an input impedance equal to the wave impedance of the power cable. To reduce the stability of the operating frequency and protect the connection point of the antenna power cable from environmental influences, a dielectric cover is installed on top of the metal cylinder.

The proposed utility model is presented in the figure, where the half-wave vibrator 1 and the coaxial quarter-wave line 2 are made in the form of a metal rod passing coaxially inside the metal cylinder 3 and rigidly connected to it in the base flange 4. In order to increase the reproducibility of the operating frequency, the power cable 6 is connected to the point power 7 through connector 8 mounted on the side of the cylinder on some

spaced from a short circuit in the base flange. This distance is chosen so that the input impedance at point 7 is equal to the impedance of the whipped power supply. The base flange 4 is at zero potential and is connected to a grounded mast device 9, which ensures reliable lightning protection. To stabilize the operating frequency and protect the connection point of the antenna power supply cable from environmental influences, a dielectric cover is installed on top of the metal cylinder 5. In the middle part of the half-wave vibrator in the support the sleeve 10 perpendicular to the axis of the half-wave vibrator are installed in opposite directions two dielectric traverses 11, on one of which is flush B half-wave vibrator is rigidly attached metal rod reflector 12. In the second traverse similarly attached metal rod Director 13.

This directional antenna of vertical polarization with coaxial matching is easy to manufacture, well-compatible with high-frequency coaxial transmission lines, provides high stability of the operating frequency, is protected from atmospheric influences.

At present, a prototype utility model has been manufactured and has confirmed its operational characteristics as a part of a radio station in frequency diagonal zones 450 - 480 MHz.

SOURCES OF INFORMATION.

1. "VHF antenna with vertical polarization, magazine" Radio No. 3, 1980, p. 58.

2. Certificate No. 18020 was published on May 10, 2001, Bull. No. 13.

Claims (1)

A directional antenna of vertical polarization with coaxial matching, containing a half-wave vibrator turning into a closed quarter-wave line, two dielectric traverses rigidly fixed in the support sleeve perpendicular to the axis of the half-wave vibrator in opposite directions from it, on one of which a metal rod is rigidly fixed to the axis of the half-wave vibrator , on the second traverse, the director’s metal rod is similarly fastened, characterized in that the half-wave vibrator and a closed quarter-wave coaxial line is made in the form of a metal rod passing coaxially inside the metal cylinder and rigidly connected to it in the base flange, the ratio of the inner diameter of the metal cylinder to the diameter of the metal rod corresponds to the wave resistance of the power cable, the power cable is connected to the quarter-wave line through a connector installed on the side surface of the cylinder opposite the supply point, the distance to the supply point is selected depending on the frequency You set the antenna and corresponds to the input impedance, a dielectric cover is installed on top of the metal cylinder.