System configuration antenna

 

(57) Abstract:

The invention relates to the field of radio, namely radio transmitting equipment. Achievable technical result is the construction of a system configuration antenna with enhanced immunity and the absence of radiation of electromagnetic energy in free space, due to the use as a signal, excitation system configuration antenna accidental interference. System configuration antenna consists of a transmitting antenna, the second antenna matching unit, a switch, a first receiver, second receiver, the first quadratic detector, the second quadratic detector, divider, voltage, indicator settings. System configuration antenna can be used to harmonize the output of the transmitter to the input of the transmitting antenna without radiation in the broadcast transmitting antenna electromagnetic waves and in the presence of increasing levels of external noise, including intentional. 3 Il.

The invention relates to the field of radio, namely, radio transmitting equipment, and, in particular, the claimed system configuration antenna can be used to harmonize the output of the transmitter to the input of phronia external interference, including intentional.

A device matching the transmitter to the antenna (see, for example, ABT. St. USSR N 769708, IPC H 03 J 3/22, publ. 07.10.1980 g), which contains the tunable matching circuit, the sensor active component of conduction, amplitude and phase discriminatory, the control unit, the element of coincidence.

A disadvantage of this device matching the transmitter to the antenna is the radiation of electromagnetic energy in free space, which in some cases is unacceptable.

It is also known automatic matching device (see, for example, ABT. St. USSR N 1356209, IPC H 03 H 7/40, publ. 30.11.1987 g), which contains the sensor phase sensor active conductivity, tunable capacitor, antenna, cut two long lines with ferrite and managing bias winding, three of the control unit, computing unit, ADC.

A disadvantage of this device matching the transmitter to the antenna is the radiation of electromagnetic energy in free space, which in some cases is unacceptable.

The closest analogue of the claimed device (prototype) in its technical essence is a well-known system is the equivalent load, the control device, bridge, tuning unit, antenna.

Thus the input impedance of the device connected to the antenna, and the output to the first output switch, the second terminal of which is connected to the transmitter, and the third output switch connected to the dummy load and the bridge, the diagonal of which included the monitoring device.

Applying a dummy load and the bridge circuit in this system configuration antenna allows you to get simple and fast setup operation and a low level of radiated electromagnetic energy in free space.

The disadvantage of this system configuration antenna is the radiation of electromagnetic energy in the air and low immunity due to the fact that when configuring the antenna of the power generated by the transmitter, radiates in free space and at the same time, the control device may be affected by interference coming through the configurable antenna.

The aim of the present invention is the development of a system configuration of a transmitting antenna with a higher noise immunity and the absence of radiation of electromagnetic energy in free space, due to the use in quality is attained, however, in a known system configuration antenna containing matching device representing the narrowband resonant matching circuit, whose input is connected to the transmitting antenna and the output to the first and third terminals of the switch, the second terminal of which is connected to the output of the transmitter and the indicator settings, inputs of the second antenna, the first and second receivers, the first and second quadratic detectors and voltage divider. The second antenna has a radiation pattern that is identical with the transmitting antenna, and is connected to the fifth output of the switch. The fourth output switch connected to the input of the first receiver, which is connected with the first quadratic detector. The sixth output of the switch is connected to the input of the second receiver, which is connected to the second quadratic detector. The outputs of the first and second quadratic detectors connected respectively to first and second inputs of the voltage divider, the output of which is connected to the input of the indicator settings.

The principle of the proposed device is based on theorem of reciprocity receiving and transmitting antennas (Drabkin C. L., Zuzenko A. L. "Antenna-feeder devices"): "Soviet Radio", 1961, page 136), and tichina constant provided what antenna are subject to the same electromagnetic wave, the coefficients aligning antennas with loads constant and antennas have the same radiation pattern. At the same time, the higher the gain matching of the first antenna with its load increases in proportion to the value of the ratio of capacity, given the first and second antennas in their load, under the same conditions.

Thus, the operation of the device based on the reception of the transmitting and the second antennas random interference and making decisions about the end of the setup when it reaches its maximum value relations capacities given in their load-transmitting and the second antenna.

Such a construction of the device unlike the prototype, where a decision about configuring system uses a high-frequency signal of the transmitter and does not take into account the effect of interference has the following advantages: increased noise immunity settings, so as to accuracy settings are not affected by the increased level of interference of all types, eliminates the emission of electromagnetic energy in free space, because the system antenna configuration does not contain a source of high-frequency signal. Prov.Aya diagram of the system configuration antenna

in Fig. 2 - graphics low-frequency signals at the outputs of the first 5 and second 6 receivers

in Fig. 3 - graphs of the effective values of the voltages of the low-frequency signals at the outputs of the first 5 and second 6 receivers.

The system configuration of the antenna shown in Fig. 1, contains a transmitting antenna 1, the second antenna 2, the matching device, representing the narrowband resonant matching circuit 3, a switch 4, the first 5 receiver, a second receiver 6, the first quadratic detector 7, the second quadratic detector 8, the voltage divider 9, the indicator settings 10.

When this input matching device 3 is connected to a transmitting antenna 1 and the output to the first and third terminals of the switch 4, the second terminal of which is connected to the output of the transmitter, the second antenna 2 is connected to the fifth output of the switch 4, are connected to the first radio 5 and the first quadratic detector 7, and are connected to the second radio 6 and the second quadratic detector 8, the fourth and sixth terminals of the switch 4 is connected to the inputs respectively of the first 5 and second 6 radios, and the outputs of the first 7 and second 8 quadratic detectors connected respectively to the first transmission quality can be applied to any antenna of the radio transmitter. The second antenna 2 is designed to receive the same radio, custom antenna, and must be identical with the pattern.

Matching device 3 is designed to coordinate the output of the transmitter to the input of a configurable antenna is a narrow-band matching circuit. Schemes such narrow-band matching circuits are known, see , e.g., Babkov C. Y., Ants Y. K. Fundamentals of building devices aligning antennas. - L.: Military red banner Academy of telecommunications, 1980, page 73.

Switch 4 is used to control system operation modes antenna alignment, which has two modes of operation. The first mode is setup, the second mode is "transfer". As the switch 4 can be used a standard three-pole switch with one normally contact and two NC switches. Conclusions switch 4 shown in Fig. 1, numbered in ascending order from top to bottom and from left to right, and the input pins have odd numbers, and output pins - even numbering. Thus, the input and output of the conclusions of the break contacts of the switch 4 are numbered respectively 1 and 2, and the input and output conclusions Zam is equal to the mode transfer.

The first 5 and second 6 receivers are designed to receive on the frequency of random interference and convert them to low frequency. The first 5 and second 6 receivers operate without automatic gain control. As the first 5 and second 6 radios can be used any commercially available radios for trunk radio, for example P-P.

The first 7 and second 8 quadratic detectors are used to determine the operating voltage at the outputs respectively of the first 5 and second 6 receivers. The scheme of the quadratic detector is known, see, e.g., Measurements in communications technology. Ed. by F. Kushnir Century): "Communication", 1970, pages 234-236, Fig. 6.38.

The voltage divider 9 is designed to determine the value of the ratio of the voltage in a wide range of changes in the voltages received at its inputs. Schemes such factors are known, see, e.g., Hughes, R. C. Logarithmic video amplifier. - M.: "Energy", 1976, page 103, or Analog and digital integrated circuits, edited by S. C. Jakubowski): "Soviet radio", 1979, pp. 239-241, Fig. 4.24.

Indicator settings 10 is designed to determine the voltage ratios measure voltage, in particular, the standard voltmeter with high input impedance.

System configuration antenna operates as follows. In "setup" mode switch 4 opens normally closed contact (pins 1 and 2) and closes the no contacts (pins 3, 5 and 4, 6). The transmitting antenna 1 operates as the reception area, with occasional interference through the matching device and the closed contact of switch 4 (3 and 4 output) into the input of the first receiver 5. The second antenna 2 is located from the transmitting antenna 1 at a distance not exceeding the interval of spatial correlation. Since the transmitter 1 and the second 2 antennas have the same radiation pattern, the second antenna 2 are the same as random interference, and to the transmitting antenna 1. These random interference through the closed contact of switch 4 (5 and 6 output) into the input of the second receiver 6. Amplitude of low-frequency signals received at the inputs of the first 5 and second 6 receivers, proceed respectively to the inputs of the first 7 and second 8 quadratic detectors. The output of the quadratic detectors are allocated operating voltage of these low-frequency signals (Fig 3). These values are received respectively by 1 and 2 inputs of the divider on the ode of the voltage divider 9;

U1- the voltage supplied from the first quadratic detector 7;

U2- the voltage supplied from the second quadratic detector 8.

Thus, at the output of the voltage divider produces a voltage Ucorresponding to the value of the ratio of operating voltages of these low-frequency signals.

To explain the principle of operation of the system configuration antenna will show that the ratio of the effective voltage of the low-frequency signals obtained at the outputs of the first 5 and second 6 receivers in proportion depends only on the magnitude of the coefficient of concordance custom antenna 1 to the input of the first receiver 5.

As to the second antenna 2 are the same as random interference, and to the transmitting antenna 1, the inputs of the first 5 and second 6 receivers have the same random interference. The power delivered from the antenna to the inputs of your receiver, will be equal to

< / BR>
where P1the capacity given transmitting antenna 1 to the input of the first receiver 5;

P2- power given to the second antenna 2 to the input of the second receiver 6;

EA1- EMF induced in the transmitting antenna 1 random interference; ellenie transmitting antenna 1;

RA2- the active resistance of the second antenna 2;

1- ratio matching of the transmitting antenna 1 to the input of the first receiver 5;

2- ratio matching of the second antenna 2 with the input of the second receiver 6.

The expression (1) obtained on the basis of Drabkin C. L., Zuzenko A. L. "Antenna-feeder devices" - M: "Owls. Radio", 1961, equations IV.19, IV.28, shown on pages 143-145.

EMF induced random noise, is equal to (see Markov, So the Antenna. - M. : "State power edition, 1960, page 195, the formula 6-28)

EA= -EhF(,)ei, (3)

where EA- EMF induced in the antenna by random noise;

E - field strength of an electromagnetic wave near the antenna;

h is the effective length of the antenna;

F (,) is the amplitude and phase characteristics of the antenna.

eiphase characteristics of the antenna.

On the basis of (1) and (2) shows that the values of the relations of power, acting on the inputs of the first and second receivers, will be equal to

< / BR>
where P1the capacity given transmitting antenna to the receiver input;

P2- power given to the second antenna to the receiver input;

E1- the electric field strength is Izzy second antenna 2;

h1- the current length of the transmitting antenna 1;

h2- the current length of the second antenna 2;

F1(,) is the amplitude and phase characteristics of the transmitting antenna 1;

F2(,) is the amplitude and phase characteristic of the second antenna 2;

- phase characteristic of the transmitting antenna 1;

- phase characteristic of the second antenna 2.

As to the transmitting antenna 1 and second antenna 2 are subject to the same interference, then E1= E1and you can write

< / BR>
From equation (5) shows that when configuring matching device 3 in the second part changes only1. Other variables the second part of equation (5) reflect the internal parameters of receive paths and are permanent. Then you can write

< / BR>
where f(1is a function of the variable1.

Thus, the values of the relations of power, given the transmitter 1 and the second antenna 2 to the inputs, respectively, of the first 5 and second 6 receivers, depends only on their ratio matching of the transmitting antenna 1 to the input of the first receiver 5.

Maximum power is transmitted from the first antenna 1 to the input of the first receiver 5 (see Drabkin C. L., Zuzenko A. L.2/4RA1, (7)

where PMax- the maximum capacity given transmitting antenna 1 to the input of the first receiver 5.

From equations (6) and (7) out

< / BR>
Thus, the maximum value of the ratio matching of the transmitting antenna 1 to the input of the first receiver 5 corresponds to the maximum value of the ratio of the capacities existing at the inputs of the first 5 and second 6 receivers.

Low frequency signals received from the outputs of the first 5 and second 6 receivers have the same shape and may differ only in the level (see Fig. 2) and an initial phase, which depend on the gain of the receivers and capacity of high-frequency signals into the inputs of the first 5 and second 6 receivers and phase shift, which makes each reception path. When measuring the effective value of voltage of the low-frequency signal, the initial phase is not considered, since the effective voltage is measured over a period T (see Fig. 3). As well as receivers work without AGC, the ratio of operating voltages of these low-frequency signals also depends on the coefficient of concordance 1the first antenna 1 to the input of the first receiver 5. So it is, you can write

< / BR>
THE ULF.2- RMS voltage low-frequency signal obtained at the output of the second receiver 6;

(1is a function of the variable1.

As was shown above, the ratio of operating voltage Un/ULF.2low-frequency signals obtained at the outputs of the first 5 and second 6 receivers, depends only on the coefficient of concordance1the transmitting antenna 1 to the input of the first receiver 5. Therefore, the matching unit 3 and, therefore, the change of the coefficient of concordance 1the transmitting antenna 1 with the first receiver 5 changes the output voltage of the voltage divider 9. The output voltage of the voltage divider 9 is supplied to the indicator settings 10, where the display of its value. Moreover, obtaining the maximum value on the display settings says about the optimum matching of the transmitting antenna 1 to the input of the first receiver 5.

As receivers trunk radio communications are made by the industry with a purely resistive input impedance, maximum power from the transmitting antenna 1 to the input of the receiver 5 will be transmitted when the internal resistance of the antenna is the active weather resistance which was redvales in load resistance (for example, 50 Ohm, 75 Ohm and so on), if the condition Rolane= RRef.PfP.approval of the transmitting antenna in receive mode with the input of the receiver adequately agreement the transmitting antenna in the transmission mode with the output of the transmitter.

The task of matching performs matching device 3, which in the frequency ensures compliance with this condition, i.e.

RRef.PfP.= RA. (10)

Thus, the system antenna configuration is to control tuning unit 3 to obtain the maximum value on the indicator settings 10.

When it reaches its maximum value indicator setting ends and the antenna system configuration is transferred from the "setup" mode in the "run" mode via a switch 4. The switch 4 in the "run" mode (see Fig. 1) opens trailing contacts (pins 3, 5 and 4, 6) and closes the N.O. contacts (pins 1, 2). Thus, the output of the transmitter through the switch 4 is connected to series-connected configured matching device 3 and the transmitting antenna 1.

System configuration antenna containing matching device representing scopulorum switch the second output of which is connected to the output of the transmitter and the indicator settings, characterized in that it further introduced a second antenna having a radiation pattern that is identical with the transmitting antenna, connected to the fifth output of the switch, connected in series, the first radio and the first quadratic detector and connected in series to the second receiver and the second quadratic detector, fourth and sixth terminals of the switch are connected to the inputs respectively of the first and second radios, and the outputs of the first and second quadratic detectors connected respectively to first and second inputs of the voltage divider, the output of which is connected to the input of the indicator settings.

 

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