RU15814U1 - TELEVISION COMBINED ANTENNA - Google Patents

Abstract

Combined television antenna containing a log-periodic antenna made in the form of parallel first and second pipes of the same cross-section, to which symmetrical vibrators of different lengths are connected in phase, and a half-wave vibrator made in the form of two rods of equal length installed in a vertical plane and connected orthogonally to the pipes characterized in that the rods of the half-wave vibrator are separated from the base of the antenna from the side of long symmetrical vibrators at a distance equal to a quarter for us wave medium frequency band received half-wave vibrator television channels.

Description

The IPC H01Q 11/10 combination television antenna (hereinafter referred to as the antenna) belongs to the field of antenna technology and can be used to create broadband antenna devices for stationary reception of broadcast television signals with horizontal and vertical polarization simultaneously.

The closest in technical essence to the proposed technical solution is a log-periodic vibrator antenna (RF Patent No. 2048696, publ. 20.11.95 Bull. No. 32). This antenna consists of symmetrical vibrators connected alternately to two parallel pipes, a boom in the form of a pipe that is mounted above the first and second pipes and mounted on top of the support mast, a matching device in the form of a step transition connected between a coaxial line placed in the first pipe , and a second pipe.

A disadvantage of the known log-periodic antenna is the design complexity, its considerable length and mass. To ensure the coordination of the distribution and coaxial lines, a broadband matching device in the form of a stepped coaxial transition is necessary. The antenna does not provide reception of broadcast television signals with horizontal and vertical polarization at the same time.

The proposed antenna provides the reception of television signals with horizontal and vertical polarization at the same time, due to the combination of two different types of antennas (log-periodic and half-wave vibrator) in one combined. Typically, the addition of signals from two antennas requires the installation of a matching device.

The claimed utility model is based on such an implementation of a television combined antenna that allows you to use the structure of the log-periodic antenna for matching a half-wave vibrator with a drop cable.

This is achieved by the fact that a half-wave vibrator is introduced into the log-periodic antenna from symmetric vibrators connected in turn to two parallel pipes in the form of two rods of equal length along the vertical plane, connected orthogonally to the pipes and separated from the antenna base from the side of long symmetric vibrators by a distance equal to a quarter of the wavelength of the medium frequency range of the television channels received by the half-wave vibrator.

In FIG. shows a television combined antenna, appearance.

Combined television antenna consists of a log-periodic antenna and a half-wave vibrator. Log-periodic antenna contains a distribution line made in the form of a two-wire line parallel to the first and second pipes 1 of the same cross-section and a grid of symmetrical vibrators 4 of different lengths connected in opposite to the pipes 1 of the distribution line. The half-wave vibrator consists of two rods 2 of equal length, mounted in the vertical plane of the orthogonal distribution line. The drop cable is located in the first pipe 1 and is connected to

distribution hoses with a cable connection unit installed at the top of the antenna from the side of the short symmetrical vibrators under the cover 3. The rods 2 are connected to the first and second pipe 1 and are separated from the antenna base from the side of the long symmetrical vibrators at a distance L equal to a quarter of the medium frequency wavelength the range of television channels received by a half-wave vibrator. At the same time, the segment of the distribution line from the base of the antenna from the side of the long symmetrical vibrators to the rods of the half-wave vibrator forms a quarter-wave transformer for matching the wave resistance of the half-wave vibrator and the reduction cable.

The antenna is mounted on the support mast 5.

As an example of a specific implementation, a television combined antenna made of aluminum was selected with the following geometry parameters: overall dimensions of the antenna 1177x860x2055, distance L from the base of the antenna from the side of long symmetrical vibrators to the rods of a half-wave vibrator of 1000 mm.

The above antenna is commercially available.

Main technical specifications:

Received TV channels:

MBc range 1 to 5 channel

range MBs 6 to 12 channel

DMVs range 21 to 60 channel

Antenna gain in relation to a half-wave vibrator, dB, not less than: -from the 1st through the 5th channel

6th through 12th channel7

from the 21st to the 60th channel8

Antenna interference, dB, not: narrower:

- from the 1st through the 5th channel0;

from the 6th to the 12th channelminus 13

from the 21st to the 60th channelminus 18

The minimum value of the coefficient of the traveling wave of the antenna, not less than: -from the 1st through the 5th channel 0.2;

6th through 12th channel 0.25

from the 21st to the 60th channel 0.5

 li (

(vertical polarization)

Weight, kg, no more than 0.6

Claims (1)

Combined television antenna containing a log-periodic antenna made in the form of parallel first and second pipes of the same cross-section, to which symmetrical vibrators of different lengths are connected in phase, and a half-wave vibrator made in the form of two rods of equal length installed in a vertical plane and connected orthogonally to the pipes, characterized in that the rods of the half-wave vibrator are separated from the base of the antenna from the side of long symmetrical vibrators at a distance equal to a quarter for us wave medium frequency band received half-wave vibrator television channels.