FI75451C - End radiator with a connection dipole and waveguide construction. - Google Patents

Description

FIELD OF THE INVENTION is set in parallel planes perpendicular to the direction of travel, each comprising at least one half-wave dipole.

Such end radiators are known in the literature (e.g. E. SPindler "YAGI antennas als Spezial-fall Allgemeiner längsstrahlender Strukturen" - "YAGI antennas as special cases of general end radiating structures", FUNKTECHNIK 1966, pages 91-194, pages 91-194). and 165/166) and in practice in numerous applications, and are often so-called 15 in particular for the UHF television band.

YAGI antennas with a reflective shade and a polar hip connection rod between the connection dipole and the waveguide structure (s). In these antennas, the guides of the sub-conductor structure for increasing the gain are arranged in sipol-20 groups, which in the simplest case consist of two axially aligned half-wave dips tightly connected by an insulating piece (see e.g. DE-PS 161261). X-shaped dipo1 combinations are used for complex solutions (see "XC Antennas Fa.

25 Fuba, Hans KOlbe & Co.), or spectacle-shaped arrangements which always have a conductor loop instead of a half-wave dipole (see, for example, the applicant's antenna "Super-Spectral N").

All these known end radiators need not only a large number of said dipole groups per unit length, in particular in the vicinity of the connection dipole, but also a large number of groups of different lengths in order to achieve sufficiently good electrical properties. Although the associated high material and manufacturing cost of 75451 can be reduced by using a smaller number of dipole arrays, the inferior electrical values of such antennas are not sufficient for most applications.

The object of the invention was to provide an end radiator as described in Fig. 5 above, which is as simple as possible in comparison with the values comparable to the current state of the art, or by means of which better electrical properties are achieved at the same cost.

This problem is solved by replacing the antenna elements in at least one plane perpendicular to the propagation direction of the waveguide structure with a single half-wavelength dipole in the plane of symmetry of the waveguide structure and with a single half-wavelength dipole

Thus, compared to an antenna having similar electrical properties, part of the dipole group can be omitted; from where, especially on a single wavelength: in the vicinity of 20 access dipoles. For example, in the applicant's short "Super-Spectral N" antenna, only 3 lens-shaped directors and 3 simple dipole rods are needed in that area instead of 5. It goes without saying that the more complex and thus more expensive the dipole groups to be omitted, the greater the achievable savings.

In addition to the economic advantage, the lower number of rectifiers also results in lower air resistance. Going towards the radiation end of the main radiator, the yk-30 dipoles have a decreasing effect on the increase in gain, so there are less potential savings on dipole rhymes. Instead, the length and location of the individual dipoles provide effective antenna savings, which can clearly reduce the different lengths of the dipole groups (in the extreme case, only one length is required), resulting in an additional cost reduction compared to the current state where different lengths are used for tuning. necessary. At the same time can be in this way

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75451 achieves an improvement in side maximum attenuation.

It is self-evident that both of these measures can also be used alone as well as in several aspects of the waveguide structure in all combination solutions.

On the other hand, it is possible to use the structure of the end radiator according to the invention to improve the electrical values so that the costs remain the same or increase only slightly.

The known end radiators described at the beginning have an optimal use of a full-wave connection dipole (see, for example, DE-PS 1 616 261, column 4, lines 54-59). Since these antennas and the necessary symmetry components do not have a conductive connection with the ground during operation, they are equipped with chokes to protect against overvoltages. Instead, the addition of single dipoles according to the invention allows the use of a half-wavelength dipole, while at the same time having a good broadband connection to the waveguide structure, whereby no special overvoltage protection means are required due to the ground connections used.

The figures show a simple implementation example of an end radiator according to the invention for a UMF television band with only one waveguide structure, the reflector being omitted for simplicity. Figure 1 is a horizontal projection, and Figures 2 and 3 are sections on a larger scale along lines A-B and C-D.

Attached directly to the tubular longitudinal support 1, next to the reflector not shown in the figure, is an insulating connection housing 2 with a full-wave dip-dip 3, a radiation-pointing waveguide structure, and a connection dip 4 for broadband control. The genuine conductor structure consists of seven individual dipoles 5 and seven dipole groups 6, which are connected in alternating order to the longitudinal support 1, against it, 35 and thus also against the direction of radiation, in perpendicular planes.

The individual dipoles 5, like the switching dipole 4, are metal rods fastened directly to the pdt bracket 1 in the middle with screws 7, the length of which is less than half of the operating frequency. The dipole groups 6 each consist of a central resistor 8 with a central part 9 to be attached to the longitudinal support 1 and two U-shaped parts 10 pointing symmetrically to it, and two 5 also U-shaped metal loops 11, the free ends of which are inserted into the free ends of the parts 10. to comparisons 12 and attached there. The groove 13 of the parts 10 of the resistor piece 8 enables good stability at a low material cost. For attaching the dipole groups 6, there are metal clamps 14 which are attached to the cam connected to the groove 13 by means of a connecting plate 13. The metal loops 11 made of strip material form, in a known manner, two dipoles 15 vertically spaced apart, slightly less than half the wavelength. They are shaped at two points 16 and 17 to increase mechanical stability.

The connection housing 2 is fixed to the longitudinal support 1 by a wing screw 18.

Due to the optimal dimensioning and positioning 20, only two different lengths of dipole groups 6 and three different lengths of individual dipoles 5 are required. This antenna can be manufactured compared to a conventional end radiator made of 9 dipole groups of different lengths without individual dipoles, at a lower cost, and with approximately the same electrical values and also a broadband-better front-to-back ratio.

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Claims (1)

5 A CLAIM __ - 75451 An end beam equipped with a connection dipole 11a and a wave conductor structure comprising at least two sub-conductor structures, each sub-conductor structure being provided with at least one pair of radially coupled antenna elements, the sub-conductor arteries , characterized in that in at least one region of the waveguide structure the antenna elements (6, 6 ') in a plane perpendicular to the direction of propagation are replaced by a single half-wave dipole (5) in the plane of symmetry of the waveguide structure, and that a single half-wave dipole (5) and all antennas (6) 6 ') equipped plane following each other in 15 alternating order in the direction of travel. 20