Excitation mode of a wide-band antenna array and a wide-band antenna array (variants) for its execution

FIELD: the invention refers to the field of radio technique namely to antenna technique.

SUBSTANCE: it may be used at designing antenna arrays for communication systems, location and electronic warfare. The technical result is in increasing the coefficient of efficiency of an antenna, range of action and efficiency of a radio system due to providing possibility of excitation of electromagnetic field in the shape of a bi -polar ultra short impulse signal that increases directivity of an antenna array. According to the proposed technical solutions an informative signal is transformed into an electromagnetic field in transmission lines and received electromagnetic field is divided along n horn oscillators with a tone-modulated electro magnetic wave antenna array. After division of the electromagnetic field along horn oscillators one part of the unipolar monoimpulse electromagnetic field is delayed in time for the half of the duration of the informative signal, the phase of this part of the electromagnetic field is transformed on the opposite and is interfered with the other part of the electromagnetic field. The wide-band antenna array for execution of the mentioned mode has an excitation system on n outputs and connected with it a radiating aperture fulfilled out of n horn oscillators with tone-modulated electromagnetic wave.

EFFECT: increases coefficient of efficiency.

4 cl, 7 dwg

 

The invention relates to the field of radio engineering, in particular to antenna technique, and can be used for the design of antenna arrays for communications systems, locations, and electronic warfare.

Closest to the claimed technical solution is the way of the broadband excitation of the antenna array [1], namely, that transform an informative signal in the electromagnetic field in the transmission line, divide the received electromagnetic field n to horn radiators of an antenna array with THE wave, which then radiates. Broadband antenna array for the implementation of this method contains the excitation system on n outputs and the associated radiating opening, made of n horn radiators with THE wave.

The disadvantage of this technical solution is small, the efficiency of the antenna array when excited her informative signal in the form of ultrashort unipolar monopulse [2]:

where Um- pulse amplitude;

τuo- duration pulse at the zero level;

t - time;

R is the distance covered by the pulse;

Vothe propagation velocity of the pulse.

In this informative signal in the aperture of the antenna array is excited by electromagnetic the OLE in the form of a monopulse signal. The coefficient of the directional Duantenna, the aperture of which is excited by a field in the form of monopulse, is determined by the expression [2]:

where Dωo=4π/λo2Ao- coefficient of directional antennas for monochromatic oscillations with wavelength λo,

where λouoVo;

Ao- the current size of the aperture of the antenna.

From the expression (2) shows that the coefficient γ antenna excited by ultrashort mono-impulse is only 25% compared to the efficiency γ antenna excited by a monochromatic wave with the corresponding wavelength, which reduces the range and efficiency of a radio system four times in comparison with the radio system operating on a monochromatic oscillations.

At the same time, the calculations and the experiment show [2]that upon excitation in the aperture of the antenna electromagnetic field E in the form of a bipolar pulse:

The coefficient of the directional DBbecomes equal to

Thus, the excitation of the aperture antenna of the electromagnetic field in the form of a bipolar pulse (3) increases the ratio of the directed action is s D Bantenna 9.5 times as compared with the coefficient of directional Dufor unipolar monopulse (1) and 2.37 times as compared with the coefficient of directional Dωofor harmonic oscillations, which increases the efficiency of the antenna, the range and efficiency of a radio system.

The excitation of the electromagnetic field in the form of a bipolar pulse (3) directly by the generator is not possible, when the pulse duration τuobecomes shorter than a few nanoseconds. However, the excitation of the electromagnetic field in the form of a bipolar pulse (3) in the aperture of the antenna directly to the antenna.

The objective of the proposed group of inventions is to increase the efficiency of the antenna, the range and efficiency of a radio system by providing the possibility of excitation of the electromagnetic field in the form of bipolar ultrashort pulse signal that increases the directivity of the antenna array.

The solution of this problem is achieved in that in the method of the broadband excitation of the antenna array, wherein the informative signal is converted into an electromagnetic field in the transmission line and divide the received electromagnetic field in n horn radiators SO-wave antenna array, the donkey separation of the electromagnetic field on the horn radiators one part of the electromagnetic field unipolar monopulse delayed in time by half of the duration of the informative signal, transform phase this part of the electromagnetic field on the opposite and it interfere with the other part of the electromagnetic field.

Broadband antenna array for the implementation of this method (the first option) contains the excitation system on n outputs and the associated radiating opening, made of n horn radiators with THE wave, with each horn emitter consists of two horns, one of which is connected to the first output of the divider, the input of which is connected to one of n outputs of the excitation system, and the second mouthpiece is made opposite phase relative to the first horn and connected to the output of the delay line of length equal to half the length of monopulse, the entrance of which is connected to the second output of the divider into two areas.

Broadband antenna array for the implementation of this method (the second option) contains the excitation system on n outputs and the associated radiating opening, made of n horn radiators with THE wave, with each of the n horns of the antenna array connected to the first output of the divider, the input of which is connected to one of n outputs of the excitation system, and to the second output of the divider to the two directions is connected to the input of the delay line with length equal to a quarter of the length of monopulse, the output of which connection is Chen cage reflector.

Broadband antenna array for the implementation of this method (the third option) contains the excitation system on n outputs and the associated radiating opening, made of n horn radiators with THE wave, with each of the n horns of the antenna array is made in the form of a biconical horn, the inlet of which is connected to one of n outputs of the excitation system, and half of the aperture of the biconical horn connected to the reflector located at a distance from the top of the biconical horn, equal to a quarter of the length of monopulse.

In the proposed technical solutions to improve the efficiency of the antenna, the range and efficiency of a radio system is the possibility of excitation of the electromagnetic field in the form of bipolar ultrashort pulse signal that increases the directivity of the antenna array.

The invention is illustrated by drawings, where figure 1 presents the timing diagram explaining the essence of the proposed method of broadband excitation of the antenna array; and figure 2, figure 3, figure 4 and figure 5 variants broadband antenna array.

Figure 1 shows:

a - chart unipolar informative monopulse signal at the input of a broadband antenna array;

b - chart unipolar, satariano what about the opposite phase monopulse signal;

in the diagram of the bipolar pulse in the aperture of the antenna.

Figure 2 shows the structural diagram of the broadband antenna array, where

1 - input coaxial antenna connector;

2 excitation system with n outputs;

3 - output connectors of the excitation system;

4 - input connector horn radiator;

5 - horn radiator.

Figure 3 shows the first embodiment of the horn radiator broadband antenna array, where

4 - input connector horn radiator 5;

6 - divisor on two areas;

7 - delay line length L;

8 - the mouthpiece.

Figure 4 shows a second embodiment of a horn radiator broadband antenna array, where

4 - input connector horn radiator 5;

6 - divisor on two areas;

8 - mouthpiece;

9 is a delay line of length L/2;

10 - reflector cage.

Figure 5 shows a third embodiment of a horn radiator broadband antenna array, where

4 - input connector horn radiator 5;

11 - biconical horn;

12 - reflector.

Delay lines 7 and 9 represent a segment of a uniform transmission line of a given length (see Alhelal and other Reference items waveguide technology. Ed. - 2F, M, Owls. Radio, - 1967, page 36, RIS).

Implementation of the proposed method of excitation brimmed the Noah antenna array is as follows.

Informative unipolar signal (Fig 1, a) is fed to the input of a broadband antenna array, it is formed into the opposite phase unipolar signal (figure 1, b), which is delayed by half the pulse duration. Pulses (Fig 1, a and 1, b) come to the opening of the antenna array, interfere with each other and form the aperture bipolar pulse (figure 1). This bipolar pulse electromagnetic field excited in the aperture broadband antenna array, creates a radiation field, which according to the expression (4) provides sverkhnapravlennye coefficient directional antenna 2.37 times, surpassing the directivity factor of the antenna is excited by a monochromatic signal. Sverkhnapravlennye coefficient directed action ensures the increase of efficiency of the respective radio systems, increases the range and efficiency of a radio system by increasing the signal-to-noise ratio at the input of the receiver.

The first option is a broadband antenna array (figure 2, figure 3), which implements the proposed method of excitation, works as follows.

On the input coaxial connector 1 broadband antenna array fed informative unipolar signal (Fig 1, a), which is converted into the electromagnetic field in the line is the transmission and split output terminals 3 of the excitation system on n outputs, each of which is connected to input terminal 4 of the horn radiator 5 (figure 2).

Electromagnetic field informative unipolar pulse (Fig 1, a) is supplied to input terminal 4 of the horn radiator 5 (figure 3), which consists of two horns 8. One of the horns 8 is connected to the first output of the divider 6, the inlet of which is connected to the input 4 of the horn radiator 5. Resulting in one part of the electromagnetic field unipolar pulse (Fig 1, a) stimulates the opening of the first horn 8 field E1(figure 3). The second output of the divider 6 is connected to the input of the delay line 7, made in the form of a segment of a uniform transmission line of length L equal to

The output of the delay line 7 connects the second horn 8 antiphase with the first mouthpiece 8.

The second part of the electromagnetic field unipolar pulse (Fig 1, a) is delayed by half of the duration of the pulse in the delay line 7, change the phase on the opposite (figure 1, b) and stimulates the opening of the second horn 8 electromagnetic field E2unipolar delayed by half of the pulse duration, phase field E1the first horn.

In turn, the electromagnetic fields of the two unipolar pulses E1and E2, interferir equivalent common aperture antenna array, excite in him ELEH the electromagnetic field of a bipolar pulse (1, b).

In the first variant implementation of the broadband antenna array (figure 2, figure 3) improving the efficiency of the antenna, the range and efficiency of a radio system is achieved by:

- separation of the unipolar pulse into two equal parts;

- delays and perefrazirovki one part of the unipolar pulse;

interference detained antiphase pulse part with the other part of the unipolar pulse and the excitation in the aperture of the antenna array of the bipolar pulse.

The second option is a broadband antenna array (figure 2, figure 4), which implements the proposed method of excitation, works as follows.

After separation of n outputs (output connectors 3 excitation system) electromagnetic field unipolar pulse (Fig 1, a) is fed to the input 4 of the horn radiator 5 (figure 4), which is connected to the divider 6 in two directions, to the first output of which is connected to the mouthpiece 8. The second output of the divider 6 is connected delay line 9, made in the form of a uniform transmission line of length L/2, is equal to

The output of the delay line 9 is connected to the reflector cage 10.

Electromagnetic field unipolar pulse (Fig 1, a) is divided in the divider 6 into two equal parts, with one part in the form of a unipolar pulse (Fig 1, a) enters rupari excites in him the aperture field E 1. The other part of the unipolar pulse enters the delay line 9, is delayed in its exit on the fourth part of the pulse that is reflected from the reflector 10, in this case, changing the phase opposite phase is distributed in the delay line 9 in the opposite direction, the result is still lingering on the fourth part of the pulse duration. Eventually delayed by half of the duration of the unipolar pulse of opposite phase unipolar pulse (Fig 1, b) in the form of electromagnetic fields (E2enters the opening of the mouthpiece 8, where, interferir with the first part of the pulse (Fig 1, a), excites in the aperture of the electromagnetic field in the form of a bipolar pulse (Fig 1, b).

In the second variant of realization of a broadband antenna array (see figure 2, figure 4) improving the efficiency of the antenna, the range and efficiency of a radio system is achieved by:

- separation of the unipolar pulse into two equal parts;

delay and reflection of one part of the unipolar pulse;

interference of the reflected antiphase pulse part with the other part of the unipolar pulse and the excitation in the aperture of the antenna array, the bipolar pulse.

A third option broadband antenna array (figure 2, figure 5), which implements the proposed method of excitation, works as follows.

After separation n the n outputs (output connectors 3 excitation system), as in the first and second embodiments, the electromagnetic field unipolar pulse (Fig 1, a) is fed to the input 4 biconical horn 11 (figure 5) and form a cylindrical wave propagating from the center to the periphery of the biconical horn. Half of the aperture of the biconical horn at a distance of L/2, is equal to the fourth part of the pulse duration, as shown in the expression (6)is closed by the reflector 12, which reflects and changes the phase of half of the electromagnetic field unipolar pulse (Fig 1, a) and sends it to the other half of the aperture, which is free from the reflector. Resulting in half of the aperture free from the reflector is formed field unipolar pulse (Fig 1, a) E1and field opposite phase delayed by half of the pulse duration (Fig 1, b) E2that interferir among themselves, arouse in the aperture open reflector, the electromagnetic field of the bipolar pulse (Fig 1, b).

In the third embodiment, the implementation of a broadband antenna array (figure 2, figure 5) improving the efficiency of the antenna, the range and efficiency of a radio system is achieved by:

- excitation of the cylindrical aperture of the biconical horn unipolar pulse;

- reflection and delay of half an electromagnetic field unipolar pulse reflector overlying the sexes is well biconical aperture of the horn;

interference of reflected and direct unipolar pulses and forming into the aperture of the bipolar pulse.

The technical result from the use of the proposed technical solutions in comparison with the prototype is to increase the efficiency of the antenna, the range and efficiency of a radio system by providing the possibility of excitation of the electromagnetic field in the form of bipolar ultrashort pulse signal that increases the directivity of the antenna array.

Sources of information

1. RF patent №2167474, IPC H 01 Q 21/06.

2. AddressOf. Energy characteristics of aperture antennas emitting ultrashort pulses (RCM). Problems of intellectual and military transport No. 7 in the Collection of articles "55 years of service to the Fatherland", part II, Saint-Petersburg, 2005

1. The way the broadband excitation of the antenna array, wherein the informative signal is converted into an electromagnetic field in the transmission line and divide the received electromagnetic field n to horn radiators of an antenna array with THE wave, characterized in that after separation of the electromagnetic field on the horn suchtelen one part of the electromagnetic field unipolar monopulse delayed in time by half of the duration of the informative signal, convert the phase of this part of electroma the magnetic field on the opposite and it interfere with the other part of the electromagnetic field.

2. Broadband antenna array that contains the excitation system on n outputs and the associated radiating opening, made of n horn radiators with THE wave, characterized in that each of the horn radiator consists of two horns, one of which is connected to the first output of the divider, the input of which is connected to one of n outputs of the excitation system, and the second mouthpiece is made opposite phase relative to the first horn and connected to the output of the delay line of length equal to half the length of monopulse, the entrance of which is connected to the second output of the divider in two directions.

3. Broadband antenna array that contains the excitation system on n outputs and the associated radiating opening, made of n horn radiators with THE wave, characterized in that each of the n horns of the antenna array connected to the first output of the divider, the input of which is connected to one of n outputs of the excitation system, and to the second output of the divider to the two directions is connected to the input of the delay line with length equal to a quarter of the length of monopulse, the output of which is connected to the reflector.

4. Broadband antenna array that contains the excitation system on n outputs and the associated radiating opening, made of n horn radiators with THE wave, characterized in that the each of n horns of the antenna array is made in the form of a biconical horn, the inlet of which is connected to one of n outputs of the excitation system, and half of the aperture of the biconical horn connected to the reflector located at a distance from the top of the biconical horn, equal to a quarter of the length of monopulse.



 

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