RU2371819C2 - Device for production of linear vertical polarisation of signal - Google Patents

Abstract

FIELD: radio engineering.

SUBSTANCE: invention may be used at basic stations of mobile communication, for instance, of GSM 900 standard, to provide for radiation of signal with vertical linear polarisation using antennas with double linear oblique polarisation +45° and -45°. Device makes it possible to obtain linear vertical polarisation of signal using antennas with oblique polarisation. It makes it possible to transfer signal in the range of 900 MHz only with vertical polarisation, even with application of traditional antennas, also multirange ones, namely device intended for obtainment of vertical linear polarisation of radiated signal at frequencies of basic station transmitters with application of antenna with linear oblique polarisation +45° and -45°. Device for production of linear vertical polarisation of signal comprises basic station, antenna with oblique linear polarisation, feeder, phased jumpers, diplexer with inlets arranged with the possibility of proportional division of signals coming to each of diplexer inlets from transmitters of basic station and supply of the mentioned signals to inlets of antenna with oblique polarisation +45° and -45° in equal phase and amplitude to produce total vertical vector of radiated signal polarisation. Diplexer is connected to antenna by means of phased jumpers for preservation of proper phasing of signals.

EFFECT: device is quite simple, ergonomic, industrially applicable, convenient to use, does not require considerable material expenses, and may be used multiply.

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Description

APPLICATION AREA

The invention relates to devices for linear vertical polarization of a signal and can be used at mobile base stations, for example, the GSM 900 standard, to provide radiation of a signal with vertical linear polarization when using antennas with double linear oblique polarization + 45 ° and -45 °.

BACKGROUND

Currently, GSM 900 standard mobile stations for diversity reception widely use antennas with linear oblique polarization of + 45 ° and -45 °, the so-called antennas with cross-polarization, which use the effect of changing the polarization vector of the signal from subscriber devices in multipath propagation.

A device [1] is known which relates to the field of antenna technology and can be used to create two channel weakly directional antennas for cellular communication systems with mutually orthogonal linear polarization of ± 45 ° of the radiation field in channels inclined relative to the vertical Z axis of a rectangular coordinate system (XYZ) at an angle of ± 45 °, and also as emitters for two-channel sector and multipath antennas of base stations with the same polarization characteristic. It provides the formation of a radiation pattern of a two-channel antenna with mutually orthogonal polarization of the radiation field (+ 45 ° and -45 °) in the channels and in the horizontal plane (XY plane of a rectangular coordinate system), which covers at least 3 dB a sector of beam formation of a multipath antenna with a width of at least 90 °. The essence of the invention: the antenna consists of two crosswise symmetrical vibrators located above a metal screen and made on one side of the dielectric board mounted parallel to the flat screen at a height of not more than half the specified wavelength of the operating frequency range from it, in the form of a flat cross-shaped conductor, consisting of four identical and orthogonal to each other quarter-wave arms, expanding from the center of the cross-shaped conductor to its ends with an angle of wide Y rhenium, not more than 30 °, each of which is connected at a point situated at a distance d <λ - predetermined wavelength. The technical result is to ensure the formation of a radiation pattern of a two-channel antenna with mutually orthogonal polarization of the radiation field in the channels, overlapping in a horizontal plane at a level of 3 dB a sector with a width of at least 90 °.

The use of such antennas inevitably leads to the fact that the polarization vector of the signal emitted by the antenna has a slope of + 45 ° or -45 °. In some areas, this creates an unacceptable level of interference with airborne mobile communications operating in this frequency range on a primary basis using horizontal signal polarization. This limits the maximum radiated power of the GSM 900 base stations and forces mobile network operators to use antennas with vertical polarization of the emitted signal with spatial diversity of the antennas.

The closest analogue to the proposed device is the invention [1].

The technical result, the achievement of which the present invention is directed, is to provide a device that allows to obtain linear vertical polarization of the signal when using antennas with oblique polarization, which would allow the transmission of a signal in the 900 MHz band only with vertical polarization, even when using traditional antennas, including the number of multiband ones, namely, a device designed to obtain vertical linear polarization of the emitted signal at transmitter frequencies Cove base station using an antenna with a linear polarization inclined + 45 ° and -45 °, a device which would be relatively simple, ergonomic, not complex to use, economical.

SUMMARY OF THE INVENTION

The technical result is achieved by the fact that the proposed device for linear vertical polarization of the signal, including a base station, an antenna with an inclined linear polarization, a feeder, phased jumpers, characterized in that it includes a diplexer with inputs, configured to proportionally divide the signals received at each of diplexer inputs from the base station transmitters, and supplying these signals to the antenna inputs with an inclined polarization of + 45 ° and -45 ° in equal phase and amplitude to obtain the sum Nogo vertical polarization vector of the emitted signal, a diplexer connected to an antenna configured phased jumpers to maintain proper phasing signals.

The proposed device for obtaining linear vertical polarization of the signal allows to obtain linear vertical polarization of the signal when using antennas with oblique polarization and to transmit a signal in the 900 MHz band only with vertical polarization, even when using traditional, for example, X-pol antennas, including multi-band e.g. dualband 900/1800 and tripleband 900/1800 / UMTS.

In figure 1. presents a General view of the device for linear vertical polarization of the signal.

Figure 2 presents an example of a device for obtaining linear vertical polarization of the signal.

The proposed device for linear vertical polarization of the signal includes: base station 1, antenna 2 with an inclined polarization of + 45 ° and -45 °, feeder 3, phased jumpers 4, diplexer 5, inputs of diplexer 6, inputs of antenna 7.

A device for obtaining linear vertical polarization of the signal works as follows: at the reception frequencies of the base station 1, the diplexer 5 provides the transmission of signals from the antenna 2 to the base station 1, without violating the efficiency of diversity reception with an antenna with an inclined polarization of + 45 ° and -45 °, and transmission frequencies provides a proportional division of the signals arriving at each of the inputs of the diplexer 6 from the transmitters of the base station 1, and supplying them to both inputs of the antenna 7 in equal phase and amplitude. Thus, the signals of the transmitters are fed to the inputs of the antenna 7 with an inclined polarization of + 45 ° and -45 ° in equal phase and amplitude, which gives the total vertical polarization vector of the emitted signal. To maintain the correct phasing of the signals, the diplexer 5 is made by phased jumpers 4 connected to the antenna. Thus, when using an antenna with an inclined polarization of + 45 ° and -45 ° at the frequencies of the base station transmitters, the diplexer provides linear vertical polarization of the emitted signal, while maintaining the oblique polarization of the received signal of the base .

EXAMPLE.

The device for obtaining linear vertical polarization of the signal shown in FIG. 2 includes: a base station 1, for example, GSM 900, an antenna with an inclined polarization of + 45 ° and -45 °, a feeder, phased jumpers, a diplexer with inputs BTS 1, BTS 2. At the receiving frequencies of the GSM 900 base station, the diplexer ensures the transmission of signals from the antenna to the base station without violating the efficiency of diversity reception with an antenna with an inclined polarization of + 45 ° and -45 °, and at the transmission frequencies, it proportionally divides the signals arriving at each from to the diplexer moves from the transmitters of the GSM 900 base station, and feeds them to both inputs: ANT 1 and ANT 2 antennas in equal phase and amplitude. Thus, the signals of the transmitters arrive at the inputs of the antenna with an inclined polarization of + 45 ° and -45 ° in equal phase and amplitude, which gives the total vertical polarization vector of the emitted signal. To maintain the correct phasing of the signals, the diplexer is made with phased jumpers connected to the antenna. Thus, when using an antenna with an inclined polarization of + 45 ° and -45 °, at the frequencies of the transmitters of the base station, the diplexer provides linear vertical polarization of the emitted signal, while maintaining the inclined polarization of the received signal of the GSM 900 base station.

Thus, the desired technical result was achieved, namely, a device was proposed that allows to obtain linear vertical polarization of the signal when using antennas with oblique polarization, which allows the transmission of a signal in the 900 MHz band only with vertical polarization, even when using traditional antennas, including and multi-range, namely, a device is proposed for obtaining vertical linear polarization of the emitted signal at the frequencies of the transmitters of the base station and when using an antenna with linear oblique polarization + 45 ° and -45 °. The proposed device is quite economical, ergonomic, convenient and easy to use.

INDUSTRIAL APPLICABILITY.

The invention relates to devices for linear vertical polarization of a signal and can be used at mobile base stations, for example, the GSM 900 standard, to provide radiation of a signal with vertical linear polarization when using antennas with double linear oblique polarization + 45 ° and -45 °. The proposed device for obtaining linear vertical polarization of the signal allows to obtain linear vertical polarization of the signal when using antennas with oblique polarization and to transmit a signal in the 900 MHz band only with vertical polarization, even when using traditional, for example, X-pol antennas, including multi-band namely, the proposed device allows to obtain a linear vertical polarization of the signal when using antennas with oblique polarization, which allows to transmit a signal in the 900 MHz band only with vertical polarization, even when using traditional antennas, including multi-band ones, namely, a device is proposed that is designed to obtain vertical linear polarization of the emitted signal at the frequencies of the base station transmitters when using an antenna with linear oblique polarization + 45 ° and -45 °. The device is quite simple, ergonomic, industrially applicable, easy to use, does not require significant material costs and can be used repeatedly.

INFORMATION SOURCES

1. RF patent No. 2234772, cl. H01Q 1/38, publ. 2004.08.20.

Claims (1)

A device for producing linear vertical polarization of a signal, including a base station, an antenna with an inclined linear polarization, a feeder, phased jumpers, characterized in that it includes a diplexer with inputs, configured to proportionally divide the signals received at each of the inputs of the diplexer from the transmitters of the base station and supplying these signals to the inputs of the antenna with an inclined polarization of + 45 ° and -45 ° in equal phase and amplitude to obtain the total vertical polarization vector of the emitted radiation I drove it, the diplexer is made by phased jumpers connected to the antenna to maintain the correct phasing of the signals.

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