FI82322B - ANORDING FOER OEVERFOERING AV RADIOLAENKSIGNALER UPPTRAEDANDE I TVAO ELLER FLERE RADIOLAENKFREKVENSBAND. - Google Patents

Description

The invention relates to a device belonging to waveguide technology for transmitting radio link signals comprising two or more radio link frequency bands by double polarization.

The use of radio link systems generally requires separate antennas (single-band antennas) for the already-10 band radio frequency (RF) band. By means of a combination of so-called system splitters, polarization splitters and cross-filters, it is possible to connect two or more RF zones in particular to one antenna, the so-called dual-band antenna, and thus make double use of control and mounting surfaces in radio link structures. Coaxial cables up to about 3 GHz and waveguides above about 3 GHz for only one polarization are then installed as antenna supply lines. For conventional transmission with two polarizations perpendicular to each other, two antenna wires are usually required per single-band antenna and four per dual antenna.

25 Waveguides are primarily used in a simple transmission range, i.e. for carrier transmission. The development of suitable intermediates and filters to retain undesired higher wave types, the development of so-called shape filters, has made it possible to use waveguides in the region of the higher wave types where they are particularly attenuated. The SIRAL waveguide (Siemens rectangular aluminum waveguide), which is described in more detail in, for example, the special edition of the magazine "Feinwerktechnik", 82nd Vol. 1974, No. 7, pages 355-360 and in Siemens-Zeitschrift, has proved particularly advantageous for this method of installation. 1975) no 3, pages 151-154. These waveguides can also be bent over the wide side without the limitations of normal installation in the transmission range of higher wave types, alternated in the longitudinal direction and used as construction-adapted sub-lengths for construction.

5 The significant expansion of existing radio link networks, including the expansion of new frequency bands and connections, has resulted in the need for new antenna locations. More space is needed with location diversity antennas on broadband digital radio links.

10 In order to make better use of the existing antenna slots, it is therefore necessary to connect several RF bands to one antenna. Correspondingly, this extended connection of the antennas requires more antenna cables in a smaller space, as can be seen, for example, in patent publication FR-2 182 728.

15

The object of the invention is to reduce the number of four antenna supply lines (waveguides) normally required for a dual-band antenna.

To solve this problem, the invention is known for a wide-range polarization splitter having a first connection common to two or more frequency bands for connection to a dual-band or multi-band antenna feed antenna and two other directional connections connected to the polarization. is the same polarization which connects the directional connections of the polarization taps to the corresponding frequency taps 30 and consists of waveguides of a suitable type for the same polarization of the frequency bands in each case.

In a preferred embodiment of the device according to the invention, it is provided that the waveguides consist of SIRAL waveguides of a suitable type 35 used in simple and / or multiple transmission ranges and containing shape filters for multi-voltage transmission ranges, or wideband, suitable waveguides.

3 82322 having a rectangular or oval cross-section consisting of waveguides for each linear polarization.

5 The individual components are then advantageously formed from NC-milled workpieces and take part in the ventilation of the antenna connection.

The invention will now be described in more detail with reference to an exemplary embodiment shown in Figure 10.

The figure shows a block diagram of a device for transmitting HF signals of two radio link systems with only one waveguide for both polarizations. In this case, the connection antenna (dual antenna), e.g. a round waveguide, is denoted by the reference number vii-15. 2 is a wideband polarization splitter for both frequency bands of a radio link system. This is connected via two waveguides 3 for the same polarizations 20 of the two frequency bands, respectively, to a crossover filter 4, 5 for each polarization. In the example shown, the crossover filter 4 is adapted for the horizontal polarization of both frequency bands with frequencies and f2, the crossover filter 5 for the vertical polarizations of the respective frequency bands. Both waveguides 3 consist, for example, of two SIRAL waveguides of suitable type or cross-section, which can be used in both simple and multiple transmission areas, i. particularly slightly attenuating. 30 SIRAL waveguides have already been successfully installed as low attenuation antenna cables in the higher wave types. With the device according to the invention described here, the waveguide costs are reduced by half, as a result of which a substantial advantage in terms of space can be achieved, but at the same time also an additional advantage in terms of material savings.

Claims (3)

Device in guidance technique for transmission by dual-polarization of radio link signals comprising two or more radio link frequency bands, characterized by a broadband polarization switch (2) having a two or more frequency band common first connection (1) for connection to a feeder antenna. a dual band antenna or multiband antenna and two further, to the polarization associated directional connections for an abutment remote from the polarization switch, located frequency switch (4, 5), and in addition two antenna supply lines (3) for frequency bands having the same polarization, the directional connections of the polarization switch (2) to the corresponding frequency switches (4, 5) and consists of guides of a suitable type for the same polarization of the frequency bands. Device according to claim 1, characterized in that the antenna supply lines (3) consist of broadband guides having rectangular or oval cross-sections (SIRAL guides of a suitable type), which are utilized within a single and / or multiple transmission range and which comprise forming filter for the multiple transfer area. Device according to Claim 1 or 2, characterized in that the individual building parts are NC milled frame material and participate in the aeration of the antenna plant.