RU144356U1 - ANTENNA ADAPTER - Google Patents

Abstract

The utility model relates to radio engineering, namely to the field of wireless communications and can be used in the field of mobile communications and Internet access. An antenna adapter is a segment of a waveguide in which a transceiver module is placed that contains at least one internal antenna and contains at least one coaxial-waveguide junction, while a cutout is made in the waveguide for connection to the modem connector. The coaxial waveguide junction is connected to the remote antenna through the RF transmission line. The number of remote antennas and RF transmission lines corresponds to the number of coaxial waveguide transitions contained in the adapter. 1 n.p.ph., 2 s.p.f., 2 ill.

Description

The utility model relates to radio engineering, namely to the field of wireless communications and can be used in the field of mobile communications and Internet access.

From the existing level of technology, MIMO systems are known (Eng. Multiple Input Multiple Output) using the spatial coding method. This method involves the use of several transceiver antennas, and there are already LTE USB modems with two built-in antennas (http://wiki.telekomza.ru/wiki/MIMO, http://ru.wikipedia.org/wiki/MIMO, http : /law.rf/information/info-33.html).

The disadvantage of such modems is that their use in remote rooms and at the boundaries of service areas is also difficult and requires the use of modem couplers with two RF transmission lines for two remote antennas.

An antenna adapter is also known, which is a piece of a coaxial cable with a standard coaxial connector installed on one end and connected to a printed circuit board containing a strip antenna with the other end. To fix the printed circuit board on the side of the USB modem, use a bandage or clip-type clip (http : //repiteri.ru/antennye-adaptery-antennye-perehodniki.html).

The disadvantages of this antenna adapter are:

- low protection against mechanical influences of adapter elements;

- low transfer coefficient between the transceiver of the USB modem and the coaxial cable;

- the presence of energy loss of the RF signal to radiation;

- electromagnetic incompatibility with nearby electronic devices sensitive to an external electromagnetic field or interfering with the operation of the modem.

As the closest prototype, consider an antenna adapter (http://antex-e.ru/store/34760/?pos=914553), which is a bar-shaped case made of metal, on the front wall of the case there is a coaxial input / output, the upper the case wall is removable, a cutout is made on the back wall for connection to the transceiver device connector, an idle strip cable is located inside the case for electromagnetic communication with the built-in antenna of the transceiver device, and the cable is connected to the central contact of the coaxial input and does not have contact with the housing, and an RF transmission line is connected to the coaxial input / output to connect to the external antenna, the rear wall can be made movable relative to the housing and moved to the required distance from the front wall depending on the size of the transceiver device, while the transceiver connector is attached to the rear wall.

The disadvantages of the prototype are:

- work in a narrower frequency band;

- the inability to connect two RF transmission lines;

- lack of application with modems that have non-standard sizes;

- the dependence of the efficiency of the adapter on the position of the antennas built into the transceiver module.

The technical task of the utility model is to create an antenna adapter that will ensure the transmission of the RF signal from the RF transmission line of the external antenna to the USB modem transceiver and back with minimal losses, reducing the level of electromagnetic energy emitted by the USB modem to the nearest space from it.

EFFECT: provision of adapter operation in a wider frequency band, the possibility of pairing several remote antennas with USB modems having several built-in antennas, minimizing losses during the transmission of the RF signal from the RF transmission line of the external antenna to the USB modem transceiver and vice versa, reducing the level radiated electromagnetic energy by a USB modem, the ability to use an adapter with modems of different sizes.

To solve this problem and achieve a technical result, an antenna adapter is proposed, which is a segment of a waveguide in which a transceiver module is placed, containing at least one internal antenna and containing at least one coaxial-waveguide junction, while in the waveguide made a cutout for connecting to the modem connector.

The coaxial waveguide junction is connected to the remote antenna through the RF transmission line. The number of remote antennas and RF transmission lines corresponds to the number of coaxial waveguide transitions contained in the adapter.

The essence of the proposed technical solution is illustrated in the figure in the form of a block diagram shown in figure 1, which shows a particular example of the implementation of a subscriber communication system using the proposed construct, where:

1 - remote antenna;

2 - RF transmission line;

3 - antenna adapter;

4 - coaxial waveguide transition;

5 - USB modem with built-in antenna;

6 - USB extension cable;

7 - terminal device.

In an example of a specific implementation of a subscriber system for the UMTS2100 standard: remote antenna 1 - AX-2014Y, RF transmission line 2 - PK50-3-18 cable, antenna adapter 3 - is made on a circular waveguide, USB modem with built-in antenna 5 - ZTE MF92 , terminal device 7 is a personal computer (PC).

Consider the operation of the described subscriber system shown in FIG. 1 by the example of the propagation of an RF signal from a wireless operator to a terminal device 7.

The RF signal received by the external antenna 1 of the operator’s base station via the RF transmission line 2 passes through the coaxial waveguide junction 4 to the antenna adapter 3, where the USB modem 5 is located. An electromagnetic wave (EMW) propagating from the coaxial waveguide is excited in the waveguide transition 4 to the built-in antenna of the USB modem 5. As a result of the action of EMW on the conductors of the built-in antenna, the RF signal to the internal circuits of the modem flows from it. Through the internal circuits of the I8 V-modem, the RF signal goes to the input of the built-in receiver, which converts it into a sequence of electrical pulses, which is transmitted via a USB extension cable 6 to a PC or router 7. Since the pairing construct 3 covers the built-in antenna of the USB modem 5, the radiation of RF energy into the space adjacent to the construct is significantly attenuated and there are practically no losses during the transmission of the RF signal to radiation.

The figure 2 shows an example of the antenna adapter on the segment of a circular waveguide, where:

3 - a segment of a circular waveguide;

5 - USB modem with built-in antenna;

8 - USB-connector modem;

9 - conductive (exciting) element;

10 - coaxial input / output;

11 - cutout on the wall of the waveguide.

The coaxial-waveguide transition is a part of a segment of a circular waveguide 3, on which a coaxial input / output 10 is fixed, and a conductive element 9 located inside the waveguide and in contact with the central contact of the coaxial input / output 10. In another part of the segment of the circular waveguide 3, USB is placed 5 modem with a built-in antenna. To connect the 118 V-extension cable 6 to the USB connector 8, a cutout 11 is made on the wall of the waveguide 3.

Consider the operation of the antenna adapter when the modem is in the mode of transmitting the RF signal to the operator.

The transmitter of the USB modem (not shown in FIG. 2) converts the sequence of electrical pulses sent by the terminal device 7 via the USB extension cable 6 into an RF signal. The RF signal through the internal circuits of the modem (not shown in FIG. 2) is fed to the built-in antenna of the USB modem (not shown in FIG. 2), which in turn excites an electromagnetic wave in the waveguide. Having reached the coaxial waveguide transition 4, the EMW changes its structure and enters the RF transmission line 2 and propagates to the external antenna 1 emitting the EMW in the direction of the operator. The transmission coefficient of the coaxial-waveguide transition is high, and the losses in the propagation of electromagnetic waves along the waveguide are small and the transmission of the RF signal from the RF transmission line 2 of the external antenna 1 to the USB modem transceiver and vice versa with minimal losses depends on the degree of matching of the internal circuits of the modem with the built-in antenna modem. The coordination of the internal circuits of the modem with the built-in antenna surrounded by the walls of the waveguide is achieved by choosing the installation location of the modem inside the waveguide and is located at a distance from the end wall of the waveguide - less than a quarter of the average wavelength of the waveguide (for example, H ₁₁ ) of the operating frequency range of the modem.

Minimization of losses during the transmission of the RF signal from the built-in transmitter of the USB modem to the RF transmission line 2 and in the opposite direction is to reduce radiation losses by elements of the construct 3 and to reduce the loss of mismatch between the internal circuits of the USB modem 5 and its built-in antenna surrounded waveguide.

To ensure the functioning of USB transceiver modems with several built-in antennas, for example two in the LTE 2600 communication standard, the interface can be equipped with two coaxial-waveguide junctions (not shown in figures 1 and 2), for transmitting RF signals to two external antennas, on two separate RF transmission lines (not shown in figures 1 and 2). In this case, for example, each coaxial-waveguide transition will be polarized in accordance with the polarization of the radiated field of one of the built-in antennas of the USB modem.

To confirm the claimed technical result, a series of experiments was carried out.

In the first experiment, measurements were made of the level of the received RF signal from the UMTS 2100 wireless operator. When the ZTE MF192 USB modem was in a dead room and the external antenna connected to it through the proposed pairing construct, the received signal level was -75 ÷ -76 dBm, in the case of direct connection of the RF transmission line of the external antenna to the transceiver of the USB modem, the received signal level was -74 ÷ -75 dBm. Moreover, in the case of using the inventive construct does not require disassembling the USB modem to connect the RF line, which is an obvious advantage.

In the second experiment, the levels of the received RF signal of the UMTS 2100 wireless operator were measured in an open area, in cases where the USB modem was located in free space and when it was placed in the interface without 4 RF transmission line 2 connected to the coaxial waveguide junction 2. The received RF signal level in the first case amounted to -83 ÷ -85 dBm, and in the second case the signal level became less than -116 dBm, which indicates a significant shielding of the built-in antenna of the USB modem by the case and the possibility of applying to It is constructive in cases where it is necessary to ensure electromagnetic compatibility with other electronic devices exposed to RF electromagnetic fields.

In the third experiment, the P8 V-modem having two built-in orthogonally polarized antennas was placed in the inventive construct with two coaxial-waveguide junctions connected to two remote antennas via two RF transmission lines. The level of the received RF signal from the operator in the case of using the construct was -81 ÷ -83 dBm, and in the case of connecting the RF transmission lines directly to the transceivers of the USB modem about -78 ÷ -80 dBm, which is a satisfactory result. In this case, in the case of using the inventive construct, disassembling of the TL8 V-modem for connecting two RF transmission lines is not required, which is an obvious advantage.

These facts confirm the industrial applicability of the claimed antenna adapter and a wide scope.

The use of this construct allows to reduce losses due to radiation into the environment, increase electromagnetic compatibility with other electronic devices, reduce losses on the transmission of the RF signal from the USB modem to the RF transmission line and vice versa, and the possibility of supplying the construct with several coaxial-waveguide junctions allows matching USB modems with multiple integrated antennas with the same number of RF transmission lines and remote antennas.

Using the inventive antenna adapter allows you to minimize the loss of the RF signal, to reduce the interfering effect of the radiation of USB modems on other electronic devices; provides the ability to connect multiple RF transmission lines and remote antennas to one USB modem with several built-in antennas.

Claims (3)

1. Antenna adapter equipped with at least one coaxial waveguide junction for connecting to the RF transmission line, characterized in that it is a segment of the waveguide in which the transceiver module is placed, containing at least one internal antenna, a cutout is made in the waveguide to connect to the modem connector. 2. The antenna adapter according to claim 1, characterized in that it is a segment of a circular waveguide. 3. The antenna adapter according to claim 1, characterized in that the coaxial waveguide transition is a part of a circular waveguide segment on which a coaxial input / output is fixed, and a conductive element located inside the waveguide and having contact with the central contact of the coaxial input / output.