JP3086870B2 - Array antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an array antenna apparatus for use in detecting a direction of a target, and more particularly to an improvement in a radiation pattern thereof.

[0002]

2. Description of the Related Art A conventional array antenna device will be described. FIG. 17 is a diagram showing a conventional array antenna device, wherein 1 is an element antenna, 2 is a feed circuit, and 3 is a monopulse comparator. Also, in the figure, A and D represent the combined electric field of each power supply circuit 2, and A + D and AD represent addition and subtraction of each combined electric field by the monopulse comparator.

Next, the operation will be described. Signals incident on each element antenna 1 from the space are combined for each quadrant by the feeder circuit 2 in each quadrant, and input to the monopulse comparator 3. The monopulse comparator 3 adds and subtracts the signal synthesized in each quadrant and outputs a monopulse sum signal and a monopulse difference signal.

In the monopulse sum pattern, since the antenna elements are excited in the same phase, the antenna aperture distribution is as shown in FIG. 18 and the radiation pattern is as shown in FIG.
The result is indicated by a broken line in FIG. In FIG. 18, the upper side shows the antenna aperture 8 and the lower side shows the aperture distribution 16.

On the other hand, regarding the monopulse difference pattern,
Since the antenna elements are excited in opposite phases in the right and left halves of the array antenna device, the antenna aperture distribution 16 becomes the distribution shown in FIG. 19, and the left and right polarities are sharply reversed at the center of the antenna. Therefore, it is equivalent to a high harmonic component of the spatial frequency, and the radiation pattern is as shown in FIG.
9 has a high side lobe as shown in FIG. 20 obtained by performing Fourier transform.

FIG. 21 is a diagram showing a two-dimensional distribution of a monopulse difference pattern by a conventional array antenna. The side lobe level on the axis 9 for detecting the direction of a target is high, and is low in other directions. .

[0007]

As described above, the conventional array antenna apparatus has a high side lobe level of the monopulse difference pattern, and has a high sensitivity to the incidence of radio waves in a direction other than a desired direction due to the occurrence of multipath or the like. There is a problem that an error is likely to occur in the direction detection of the target because the height is high. Also, by lowering the excitation intensity of the element antenna located near the center of the antenna, it is possible to improve the side lobe level of the difference pattern, but in this case, the antenna gain of the monopulse sum pattern is reduced, and the weak target There was a problem that detection became impossible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can improve the side lobe level of the monopulse difference pattern without affecting the monopulse sum pattern at all. An object of the present invention is to provide an array antenna device that can reduce the occurrence of errors in the direction detection of a target.

[0009]

In the array antenna apparatus according to the first embodiment of the present invention, a feed circuit is divided into two regions, a central portion and a peripheral portion, and two independent regions are provided at the peripheral portion and the central portion.
Two monopulse comparators are connected, the monopulse comparator generates an independent monopulse sum signal and a monopulse difference signal, and the generated two monopulse sum signals are combined with equal amplitudes and equal phases by a hybrid, so that the entire antenna is obtained. A monopulse sum pattern is generated and output by using the switch, and one of the outputs of the switch is connected to the hybrid via a switch for independently extracting the monopulse difference signal only from the peripheral portion,
The other switch is connected to another switch, and the monopulse difference signal from the central portion is connected to the hybrid via a phase adjuster. The hybrid combines the two monopulse difference signals with equal amplitude and equal phase and outputs another switch. , And by controlling a switch, it is possible to switch and output a monopulse difference signal from only the peripheral portion and a monopulse difference signal using the entire antenna.

In the array antenna device according to a second embodiment of the present invention, the feeder circuit is divided into two regions, a central portion and a peripheral portion, and two independent monopulse comparators are connected to the peripheral portion and the central portion. The monopulse comparator generates a monopulse sum signal and a monopulse difference signal that are independent of each other, and combines the two generated monopulse sum signals with equal amplitudes and equal phases in a hybrid to form a monopulse sum pattern using the entire antenna. In addition to generating and outputting, the switch is connected to the hybrid via a switch and a phase adjuster to cut off the monopulse difference signal only at the center, and can be synthesized and output with the same amplitude and the same phase as the monopulse difference signal at the periphery, the switch Control, the mono-pulse difference signal from only the peripheral part and the entire antenna are used. It was those that can be output by switching the monopulse difference signals.

Further, in the array antenna device according to a third embodiment of the present invention, the feed circuit is divided into two regions, a central portion and a peripheral portion, and two independent monopulse comparators are connected to the peripheral portion and the central portion. The monopulse comparator generates a monopulse sum signal and a monopulse difference signal that are independent of each other, and combines the two generated monopulse sum signals with equal amplitudes and equal phases in a hybrid to form a monopulse sum pattern using the entire antenna. While generating and outputting, the monopulse difference signal only by the peripheral portion is connected to the hybrid via the splitter, one of the outputs of the splitter is connected to the hybrid, and the other output is connected to the switch. Is connected to the hybrid via the two dividers and the phase adjuster, and the hybrid A non-pulse difference signal is synthesized and output with the same amplitude and the same phase, and a signal obtained by distributing the above signal and a monopulse difference signal by only a peripheral part by a two-way distributor can be switched by a switch. A monopulse difference signal using only the section and a monopulse difference signal using the entire antenna can be switched and output.

Further, in the array antenna device according to a fourth embodiment of the present invention, the feed circuit is divided into two regions, a central portion and a peripheral portion, and two independent monopulse comparators are connected to the peripheral portion and the central portion. A monopulse sum pattern and a monopulse difference signal generated independently by the monopulse comparator, and the generated two monopulse sum signals are combined at equal amplitudes and equal phases by a hybrid to produce a monopulse sum pattern using the entire antenna. And a monopulse difference signal generated by only the peripheral portion is connected to one of the outputs of the bi-divider via a bi-divider, and the other output is connected to a switch. The signal is hybridized via an attenuator having the same attenuation as that of the above-mentioned two divider and a phase adjuster. , And synthesizes and outputs two monopulse difference signals with equal amplitude and the same phase in a hybrid, and switches the above signal and the signal obtained by distributing the monopulse difference signal of only the peripheral part by the two dividers using a switch. By controlling a switch, a monopulse difference signal only in the peripheral portion and a monopulse difference signal using the entire antenna can be switched and output.

In the array antenna device according to a fifth embodiment of the present invention, the feed circuit is divided into two regions, a central portion and a peripheral portion, and two independent monopulse comparators are connected to the peripheral portion and the central portion. A monopulse sum signal and a monopulse difference signal are generated independently by the monopulse comparator, and the generated two monopulse sum signals are combined at the same amplitude and the same phase by the two combiners, so that the monopulse sum using the entire antenna is obtained. While generating and outputting a pattern, one of the outputs of the switch is connected to two synthesizers via a switch for independently extracting a monopulse difference signal only from the peripheral portion, and the other is connected to another switch, The monopulse difference signal by the central part is connected to two synthesizers via a phase adjuster, and two monopulses are generated by the two synthesizers. The signal is synthesized and output at the same amplitude and the same phase and connected to the other switch. By controlling the switch, it is possible to switch and output the monopulse difference signal only by the peripheral part and the monopulse difference signal using the whole antenna. Things.

In the array antenna apparatus according to a sixth embodiment of the present invention, the feed circuit is divided into two regions, a central portion and a peripheral portion, and two independent monopulse comparators are connected to the peripheral portion and the central portion. The monopulse comparator generates a monopulse sum signal and a monopulse difference signal that are independent of each other, and combines the two generated monopulse sum signals with equal amplitudes and equal phases in a hybrid to form a monopulse sum pattern using the entire antenna. In addition to generating and outputting, a monopulse difference signal from only the peripheral portion is converted to one of the outputs of the two dividers via the two dividers to an unequal divider for compensating for an amplitude difference due to a path difference between the peripheral portion and the central portion. Connect the other end to the switch, and connect the monopulse difference signal from the center only to the unequal distributor through the phase adjuster. Then, two monopulse difference signals are combined and output in equal phase by an unequal distributor, and a signal obtained by distributing the above signal and the monopulse difference signal of only the peripheral part by the two distributor can be switched by a switch. By controlling a switch, a monopulse difference signal only in the peripheral portion and a monopulse difference signal using the entire antenna can be switched and output.

In the array antenna device according to a seventh embodiment of the present invention, the feed circuit is divided into two regions, a central portion and a peripheral portion, and two independent monopulse comparators are connected to the peripheral portion and the central portion. The monopulse comparator generates a monopulse sum signal and a monopulse difference signal that are independent of each other, and combines the two generated monopulse sum signals with equal amplitudes and equal phases in a hybrid to form a monopulse sum pattern using the entire antenna. In addition to generating and outputting, the monopulse difference signal from only the peripheral part is connected to the hybrid via the directional coupler to the main line, the coupled line side is connected to the switch, and the monopulse difference signal from only the central part is phased. Connected to the hybrid via the regulator, the hybrid generates two monopulse difference signals The signal is synthesized and output in phase, and a signal obtained by combining the above signal and a monopulse difference signal caused only by the peripheral portion with a directional coupler can be switched by a switch. By controlling the switch, the monopulse difference caused only by the peripheral portion is controlled. A signal and a monopulse difference signal using the entire antenna can be switched and output.

An array antenna apparatus according to an eighth embodiment of the present invention divides a feed circuit into two regions, a central portion and a peripheral portion, connects the output of the feed circuit in the peripheral portion to a two-way divider, One output of the divider is input to a two-divider for combining with the output of the feeder circuit in the center, and is combined with the output of the feeder in the center and connected to a monopulse comparator for the entire antenna aperture, and the full aperture of the antenna is connected. , A monopulse sum signal and a monopulse difference signal are generated, and the other output is connected to a monopulse comparator for a peripheral portion to generate a monopulse difference signal by an antenna aperture only in the peripheral portion. The two monopulse difference patterns can be switched and output by a switch for switching the two monopulse patterns.

An array antenna apparatus according to a ninth embodiment of the present invention has a phase shifter attached to each element in the first to eighth embodiments of the present invention so that the beam direction can be arbitrarily changed. .

In the array antenna device according to a tenth embodiment of the present invention, the feed circuit is divided into a central portion and a peripheral portion,
Further, each is divided into four parts, connected to two monopulse comparators corresponding to the peripheral part and the central part, and separately applied to the monopulse difference signals corresponding to the azimuth angle and the elevation angle output from the monopulse comparator. The switch and the hybrid according to the first embodiment are connected to each other so that a monopulse difference signal only at the antenna peripheral portion and a monopulse difference signal using the entire antenna can be output for each of the azimuth and the elevation.

According to the first embodiment of the present invention, the antenna aperture is divided into a peripheral portion of the antenna and a central portion of the antenna, and a monopulse comparator and a monopulse difference pattern are generated by arranging the monopulse comparators in each of the apertures. The pattern is assumed to have no effect by synthesizing with equal amplitude and phase by hybrid, and for the monopulse difference pattern, the polarity inversion of the aperture distribution corresponding to the monopulse difference pattern is more gradual by using only the periphery of the antenna. A monopulse difference pattern with an improved side lobe level and a monopulse difference pattern when the entire antenna aperture is used can be switched and output by combining two switches and two hybrids. Because, sidelobe level of the monopulse difference pattern is improved.

According to the second embodiment of the present invention,
The antenna aperture is divided into the antenna peripheral part and the antenna central part, and a monopulse comparator is arranged in each of them to generate independent monopulse sum pattern and monopulse difference pattern. The monopulse difference pattern is assumed to have no effect.The monopulse difference pattern with improved side lobe level by using only the periphery of the antenna to make the polarity reversal of the aperture distribution corresponding to the monopulse difference pattern gentler. It is configured so that a pattern and a monopulse difference pattern when the entire antenna aperture is used can be switched and output by combining one switch and two hybrids. There is improved.

According to the third embodiment of the present invention,
The antenna aperture is divided into the antenna peripheral part and the antenna central part, and a monopulse comparator is arranged in each of them to generate independent monopulse sum pattern and monopulse difference pattern. The monopulse difference pattern is assumed to have no effect, and the monopulse difference pattern is improved by improving the side lobe level by making the polarity reversal of the aperture distribution corresponding to the monopulse difference pattern gentler by using only the antenna peripheral part. Since the monopulse difference pattern when the entire antenna aperture is used can be switched and output by combining two splitters and two hybrids, the sidelobe level of the monopulse difference pattern is improved. That.

According to the fourth embodiment of the present invention,
The antenna aperture is divided into the antenna peripheral part and the antenna central part, and a monopulse comparator is arranged in each of them to generate independent monopulse sum pattern and monopulse difference pattern. The monopulse difference pattern is assumed to have no effect.The monopulse difference pattern with improved side lobe level by using only the periphery of the antenna to make the polarity reversal of the aperture distribution corresponding to the monopulse difference pattern gentler. The pattern and the monopulse difference pattern when the entire antenna aperture is used can be switched and output by combining one two-divider, one attenuator, one switch, and two hybrids. Sidelobe level difference pattern is improved.

According to the fifth embodiment of the present invention,
The antenna aperture is divided into the antenna peripheral part and the antenna central part, and a monopulse comparator is arranged in each of them to generate independent monopulse sum pattern and monopulse difference pattern. The monopulse difference pattern is assumed to have no effect.The monopulse difference pattern with improved side lobe level by using only the periphery of the antenna to make the polarity reversal of the aperture distribution corresponding to the monopulse difference pattern gentler. The pattern and the monopulse difference pattern when using the entire antenna aperture are represented by two switches and two
Since the output is switched by combining the distributors, the side lobe level of the monopulse difference pattern is improved.

According to the sixth embodiment of the present invention,
The antenna aperture is divided into the antenna peripheral part and the antenna central part, and a monopulse comparator is arranged in each of them to generate independent monopulse sum pattern and monopulse difference pattern. The monopulse difference pattern is assumed to have no effect.The monopulse difference pattern with improved side lobe level by using only the periphery of the antenna to make the polarity reversal of the aperture distribution corresponding to the monopulse difference pattern gentler. The pattern and the monopulse difference pattern when the entire antenna aperture is used can be switched and output by combining one two-divider, one switch, one hybrid, and one unequal distributor. ,mono Sidelobe level Luz difference pattern is improved.

According to the seventh embodiment of the present invention,
The antenna aperture is divided into the antenna peripheral part and the antenna central part, and a monopulse comparator is arranged in each of them to generate independent monopulse sum pattern and monopulse difference pattern. The monopulse difference pattern is assumed to have no effect.The monopulse difference pattern with improved side lobe level by using only the periphery of the antenna to make the polarity reversal of the aperture distribution corresponding to the monopulse difference pattern gentler. Since the pattern and the monopulse difference pattern when the entire antenna aperture is used can be switched and output by combining one directional coupler, one switch, and two hybrids,
The side lobe level of the monopulse difference pattern is improved.

According to the eighth embodiment of the present invention,
Two antenna apertures and two antenna central parts
The antenna is divided into a total of four, a two-divider is arranged at the output of the two feeding circuits in the peripheral portion, and one of the outputs and the output of the two feeding circuits in the center are combined and then input to the hybrid, so that the antenna A monopulse sum pattern and a monopulse difference pattern using the whole are generated, and the other of the two distributors connected to the two feed circuits in the peripheral part is input to the hybrid, so that only the peripheral part of the antenna is used. A monopulse difference pattern with an improved sidelobe level can be generated by making the polarity inversion of the distribution gentler, and the sidelobe level can be changed by switching the monopulse difference pattern of the entire antenna to the monopulse difference pattern of only the periphery. Is improved.

According to the ninth embodiment of the present invention,
A phased array antenna having a configuration in which a phase shifter is connected to each element antenna also improves the side lobe level of the monopulse difference pattern by employing the same configuration.

According to the tenth embodiment of the present invention, also in a two-dimensional array antenna device for detecting an azimuth and an elevation, a feed circuit is divided into a peripheral part and a central part, each of which is divided into four parts, and a monopulse circuit is provided. The side lobe level of the monopulse difference pattern can be improved by using the configuration of the first embodiment for each of the azimuth angle and the elevation angle after the comparator.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a view showing one embodiment of the present invention, in which 1a is an element antenna in the periphery of an antenna aperture,
1b is an element antenna at the center of the antenna aperture, 2a is a feeder circuit for the periphery connected to the element antenna 1a, 2b
Is a feeding circuit for the central portion connected to the element antenna 1b,
3a is a monopulse comparator for the peripheral part, 3b is a monopulse comparator for the central part, 4a is a hybrid for synthesizing the monopulse sum signal of the peripheral part and the central part with equal amplitude and equal phase, and 4b is a monopulse difference signal of the peripheral part and the central part. , 5a and 5b are switches, and 10 is a phase adjuster. Also, A, B,
C and D indicate the combined electric field of each power supply circuit.

FIG. 2 is a view showing an example of division of the antenna aperture according to the present invention, wherein 8a denotes a peripheral antenna aperture, and 8b denotes a central antenna aperture.

Next, the operation will be described. Signals incident on the element antennas 1a and 1b from the space are combined for each of the power supply circuits 2a and 2b by the power supply circuits 2a and 2b in each quadrant and input to the monopulse comparators 3a and 3b in the peripheral part and the central part. . Each of the monopulse comparators 3a and 3b performs addition and subtraction of the input signals to generate and output a monopulse sum signal and a monopulse difference signal.

The two monopulse sum signals A + D, B + C generated by the monopulse comparators 3a, 3b
Are phase-adjusted by the phase adjuster 10 so that they have the same phase with each other, are input to the subsequent hybrid 4a, are synthesized with the same amplitude and the same phase, and output the signal of A + B + C + D.

In addition, a peripheral monopulse comparator 3
The mono-pulse difference signal AD generated by a is input to the switch 5a. One of the signals AD switched by the switch 5a is input to the other switch 5b, and the other is input to the hybrid 4b.

On the other hand, the central monopulse comparator 3
The monopulse difference signal BC generated by b is input through the phase adjuster 10, and the monopulse difference signal AD of the peripheral portion input from the switch 5a and the monopulse difference signal generated by the monopulse comparator 3b of the central portion. Signal B
After the phase is adjusted by the phase adjuster 10 so that −C has the same phase, the output is synthesized and output with the same amplitude and the same phase by the hybrid 4b, and the signal of A + B−C−D is input to the switch 5b.

Therefore, when the switch 5a is set on the switch 5b side and the switch 5b is set on the switch 5a side as shown in the figure, a monopulse difference signal is output as a monopulse difference signal only by the antenna aperture in the peripheral portion. , Switch 5a and switch 5b
When the switch is set to the b-side (when the switches 5a and 5b are reversed from the state shown in FIG. 1), a monopulse difference signal due to all antenna apertures is output.

Here, the output monopulse sum signal A +
Since B + C + D is obtained when all the antenna apertures are used, the aperture distribution becomes the distribution shown in FIG. 3 and the same monopulse sum pattern as the conventional array antenna shown by the broken line in FIG. 20 is obtained.

Further, since the monopulse difference signal A + BCD output when the switches 5a and 5b are set to the hybrid 4b side is a signal using the full antenna aperture, the aperture distribution is shown in FIG. And the same monopulse difference pattern as that of the conventional array antenna as shown by the solid line in FIG. 20 is obtained.

On the other hand, when the switch 5a is set to the switch 5b side and the switch 5b is set to the switch 5a side, the monopulse difference signal AD output from the central part of the antenna is not excited because the central part of the antenna is not excited. As shown in FIG. 4, the excitation intensity is reduced, the polarity reversal of the aperture distribution becomes gentle at the center of the antenna, and the monopulse difference pattern having a Fourier transform relationship with this is shown by the solid line in FIG. 5. A low side lobe level can be obtained. The broken line shown in FIG. 5 is a monopulse sum pattern.

FIG. 6 is a diagram showing the two-dimensional distribution of the side lobes of the monopulse difference pattern due to the antenna aperture only in the peripheral portion. The side lobes on the axis 9 for detecting the direction of the target are low, and It can be seen that the side lobe level is high.

On the other hand, the two-dimensional distribution of the side lobes of the monopulse difference pattern when the entire antenna aperture is used is the same as that of the conventional array antenna as shown in FIG.
The side lobe level on the axis 9 for detecting the direction of the target is high, and the side lobes in other directions are low.

As described above, the two-dimensional distribution of the side lobes of the two monopulse difference patterns is such that the high side lobe directions are replaced with each other. Therefore, by switching the monopulse difference pattern used by the switches 5a and 5b according to the arrival direction of unnecessary signals such as multipath, a monopulse difference signal having a low side lobe level is obtained in the entire space, and the target object due to the influence of multipath or the like is obtained. Can be reduced.

Embodiment 2 FIG. 7 illustrates another embodiment of the present invention. Embodiment 2
In order to switch and output the monopulse difference pattern A + BCD when the entire antenna aperture is used and the monopulse difference pattern AD when only the peripheral antenna aperture is used, the peripheral monopulse comparator 3a From the monopulse difference pattern output AD from the hybrid 4b
, And the monopulse difference pattern output BC from the central monopulse comparator 3b is input to the hybrid 4b via the phase adjuster 10 for adjusting the phase with the switch 5.
To the terminator 6 to control the monopulse difference signal B− from the central monopulse comparator 3b.
Since C is cut off, monopulse difference patterns AD only in the peripheral portion can be obtained. Further, by switching the switch 5 to the phase adjuster 10 side, a monopulse difference pattern A + BCD of the entire antenna aperture can be extracted. Reference numeral 6 denotes a terminator for terminating unnecessary terminals.

With this configuration, the number of switches is one less than in the first embodiment, so that the configuration can be simplified as compared with the first embodiment.

Embodiment 3 FIG. FIG. 8 illustrates another embodiment of the present invention. Embodiment 3
In order to switch and output the monopulse difference pattern A + BCD when the entire antenna aperture is used and the monopulse difference pattern AD when only the peripheral antenna aperture is used by the switch 5, The mono-pulse difference pattern output AD from the mono-pulse comparator 3a is input to the hybrid 4b via the two divider 7a, and the mono-pulse difference pattern output BC from the central mono-pulse comparator 3b is adjusted in amplitude with the peripheral portion. To the hybrid 4b via a two-way divider 7b for controlling the phase and a phase adjuster 10 for performing phase adjustment. One output terminal of the two-way divider 7a connected to the peripheral system is connected to a switch 5 , A monopulse difference pattern only in the peripheral portion can be extracted. Further, by switching the switch 5 to the output terminal of the hybrid 4b, the monopulse difference pattern A over the entire antenna aperture is obtained.
+ BCD can be taken out. Reference numeral 6 denotes a terminator for terminating unnecessary terminals.

With this configuration, the number of switches is reduced by one compared with the first embodiment, so that the configuration can be simplified as compared with the first embodiment, and the peripheral monopulse comparator can be configured. The same two dividers 7 for the system from 3a to the hybrid 4b and the system from the central monopulse comparator 3b to the hybrid 4b
, The loss of both can be made equal.

Embodiment 4 FIG. FIG. 9 illustrates another embodiment of the present invention. Embodiment 4
The switch 5 outputs a monopulse difference pattern A + BCD when the entire antenna aperture is used and a monopulse difference pattern AD when only the peripheral antenna aperture is used. The mono-pulse difference pattern output A-D from the mono-pulse comparator 3a is input to the hybrid 4b via the splitter 7, and
The monopulse difference pattern output BC from the central monopulse comparator 3b is phase-adjusted with the attenuator 11 having an attenuation amount such that the loss from the monopulse comparator 3a to the hybrid 4a is equal to the loss from the monopulse comparator 3b to the hybrid 4b. Is connected to the hybrid 4b via the phase adjuster 10 for performing the above operation, and one output terminal of the two divider 7 connected to the peripheral system is connected to the switch 5, so that the monopulse difference only in the peripheral part is obtained. Patterns AD can be taken out. Further, by switching and connecting the switch 5 to the output terminal of the hybrid 4b, a monopulse difference pattern A + BCD of the entire antenna aperture can be extracted. Reference numeral 6 denotes a terminator for terminating unnecessary terminals.

With this configuration, the number of switches is reduced by one and the number of terminators can be reduced as compared with the first embodiment, so that the configuration is simplified.

Embodiment 5 FIG. FIG. 10 illustrates another embodiment of the present invention. In the fifth embodiment, the monopulse difference pattern A + BC + D when the entire antenna aperture is used and the monopulse difference pattern AD when only the peripheral antenna aperture is used are switched by the switch 5 for output. Monopulse difference pattern output AD from peripheral monopulse comparator 3a
Through the switch 5a, input one output of the switch 5a to the two combiner 15, connect the other output terminal of the switch 5a to another switch 5b, and connect the monopulse from the central monopulse comparator 3b. Phase adjuster 10 for adjusting the phase of difference pattern output BC
Is input to the second synthesizer 15 via the
At 5, the two monopulse difference pattern outputs of AD and BC are combined. Thus, by connecting the switches 5a and 5b to each other, a monopulse difference pattern AD only in the peripheral portion can be taken out. By switching connection to the end, a monopulse difference pattern A + BC + D of the entire antenna aperture can be extracted.

With this configuration, since the configuration can be made without using a terminator, the number of parts can be reduced.

Embodiment 6 FIG. FIG. 11 illustrates another embodiment of the present invention. In the sixth embodiment, a monopulse difference pattern A + BCD when the entire antenna aperture is used and a monopulse difference pattern AD when only the peripheral antenna aperture is used are switched and output by the switch 5. And a mono-pulse difference pattern output A-D from the mono-pulse comparator 3a in the peripheral portion.
Is input to the unequal distributor 12 via the two-divider 7 and the unequal distribution is performed via the phase adjuster 10 for performing phase adjustment of the monopulse difference pattern output BC from the central monopulse comparator 3b. By connecting one output terminal of the two dividers 7 connected to the peripheral system with the switch 5 as shown in FIG. 11, the monopulse difference pattern AD of the peripheral unit alone is obtained. Can be taken out. Further, by switching and connecting the switch 5 to the output terminal of the unequal distributor 12, a monopulse difference pattern A + BCD of the entire antenna aperture can be obtained. The unequal distributor 12 is an unequal distributor having a distribution ratio that compensates for the difference between the loss from the monopulse comparator 3a to the unequal distributor 12 input and the loss from the monopulse comparator 3b to the unequal distributor 12 input. is there. Reference numeral 6 denotes a terminator for terminating unnecessary terminals.

With this configuration, there is no need to connect an amplitude adjusting device, and the configuration can be simplified.

Embodiment 7 FIG. FIG. 12 illustrates another embodiment of the present invention. In the seventh embodiment, the monopulse difference pattern A + BCD when the entire antenna aperture is used and the monopulse difference pattern AD when only the peripheral antenna aperture is used are switched and output by the switch 5. And a mono-pulse difference pattern output A-D from the mono-pulse comparator 3a in the peripheral portion.
Through the directional coupler 13, the main line is input to the hybrid 4b, the coupled line is connected to the switch 5, and the monopulse difference pattern output BC from the central monopulse comparator 3b is output. The signal is input to the hybrid 4b via a phase adjuster 10 for performing phase adjustment, and two monopulse difference patterns are synthesized and output. Thus, by connecting the switch 5 to the coupling line of the directional coupler 13, a monopulse difference pattern only at the peripheral portion can be obtained. Further, by switching and connecting the switch 5 to the output terminal of the hybrid 4b, a monopulse difference pattern A + BCD of the entire antenna aperture can be extracted. Reference numeral 6 denotes a terminator for terminating unnecessary terminals.

With this configuration, in the loss from the monopulse comparator 3a to the hybrid 4a, the directional coupler 13 becomes a main line, so that
The loss is negligible. Therefore, the loss and difference from the monopulse comparator 3b to the hybrid 4b are eliminated, and the configuration can be simplified.

Embodiment 8 FIG. FIG. 13 illustrates another embodiment of the present invention. In the eighth embodiment, a two-divider 7a is connected to an output terminal of a power supply circuit 2a for a peripheral portion.
And one output terminal of the two divider 7a is connected to the peripheral monopulse comparator 3b to generate a monopulse difference pattern AD only by the peripheral portion.
The other output end of the splitter 7a is connected to a splitter 7b for combining with the output of the feeder circuit 2b at the center, and A
+ B and C + D are combined and output.

The synthesized signal is connected to a monopulse comparator 3a for the entire antenna aperture to generate a monopulse sum pattern A + B + C + D and a monopulse difference pattern A + BCD using the entire antenna aperture.

The switch 5 switches between the monopulse difference pattern A + BCD when the entire antenna aperture generated by the monopulse comparator 3a is used and the monopulse difference pattern AD generated only by the peripheral portion generated by the monopulse comparator 3b. Thus, two monopulse difference patterns are output. With such a configuration, a simple configuration without a hybrid or the like can be realized.

Embodiment 9 FIG. FIG. 14 illustrates another embodiment of the present invention. The ninth embodiment has a phase shifter 14 connected to the element antenna 1,
An example of a phased array antenna capable of scanning a beam by controlling the phase of the phase shifter 14 is shown.

The signals received by the element antennas 1 are phase-controlled by the phase shifter 14, and the signals of the elements at the periphery of the antenna are synthesized by the peripheral power supply circuit 2a. Are synthesized by the central power supply circuit 2b.

The peripheral signal is generated by outputting a mono-pulse sum signal and a mono-pulse difference signal by a peripheral mono-pulse comparator 3a, and is output by the central mono-pulse comparator 3b. Generated and output.

As in the first embodiment, by combining the switches 5a and 5b and the hybrids 4a and 4b, the entire antenna is output as a monopulse sum pattern, and the entire antenna is used as a monopulse difference pattern. And a monopulse difference signal by only the peripheral portion. With this configuration, the same effect can be obtained even with a phased array antenna having a phase shifter.

The ninth embodiment corresponds to the first embodiment, but can be similarly applied to the second to eighth embodiments.

Embodiment 10 FIG. Embodiments 1 to 9
Although the description has been given of the antenna device for measuring only one-dimensional azimuth, the same applies to the two-dimensional array antenna device for measuring azimuth and elevation as shown in FIG.

In FIG. 15, reference numeral 1a denotes an element antenna at the periphery of the antenna opening, 1b denotes an element antenna at the center of the antenna opening, 2a denotes a power supply circuit connected to the element antenna 1a, and 2b denotes a power supply circuit connected to the element antenna 1b. , 3
a is a monopulse comparator for the peripheral portion, 3b is a monopulse comparator for the central portion, 4a is a hybrid for synthesizing the monopulse sum signal of the peripheral portion and the central portion with equal amplitude and equal phase, and 4b is an azimuth angle of the peripheral portion and the central portion. Hybrid that combines monopulse difference signals for measurement with equal amplitude and equal phase, 4
Reference numeral c denotes a hybrid for synthesizing monopulse difference signals for measuring elevation angles of the peripheral portion and the central portion at equal amplitudes and equal phases, 5a and 5b are switches, 6 is a terminator for terminating unnecessary terminals, and 10 is a phase adjuster.

FIG. 16 is a diagram showing an example of dividing an antenna aperture according to the present invention. In order to form two monopulse difference signals of an azimuth angle and an elevation angle, a peripheral aperture 8a and a central aperture 8b are respectively formed by four. Divided into two.

Next, the operation will be described. The signal incident on each element antenna 1 from the space is supplied to the feeder circuit 2a,
2b, the signals are synthesized for each power supply circuit, and input to the monopulse comparators 3a and 3b in the peripheral part and the central part.
Each of the monopulse comparators 3a and 3b performs addition and subtraction of the input signals to perform a monopulse sum signal A + B + G + H, C + D + E + F, an azimuth monopulse difference signal A + B-GH, C + D-EF, and an elevation monopulse difference signal A. Generate and output −B + GH, CD−EF.

Each signal generated by each of the monopulse comparators 3a and 3b has a configuration in which two difference signal switching portions for the azimuth angle and the elevation angle in the case of the first embodiment are provided independently of each other. A signal using the entire aperture is output, and the difference signal is output by switching the switches 5a and 5b between a case using the entire antenna aperture and a case using only the periphery of the antenna aperture for the azimuth and elevation angles. Thus, the same effect as in the first embodiment can be obtained in two dimensions of the azimuth direction and the elevation direction.

Embodiment 11 FIG. Embodiments 1 to 1
In the case of 0, the number and arrangement of the element antennas are not particularly limited, and are not limited to the size of the central sub-array.

[0068]

As described above, the first embodiment of the present invention is described.
According to the above, the power supply circuit is divided into two regions, a central portion and a peripheral portion, and two independent monopulse comparators are connected to the peripheral portion and the central portion, and the monopulse comparator independently supplies a monopulse sum signal and a monopulse difference signal. Is generated, and the generated two monopulse sum signals are combined with equal amplitude and equal phase in a hybrid to generate and output a monopulse sum pattern using the entire antenna, and a monopulse difference signal caused only by the peripheral portion is independent. It is connected to the hybrid via a switch for extracting and outputting so that the monopulse difference signal by the central part and the whole antenna can be synthesized and output with equal amplitude and equal phase by controlling the switch. Since the used mono pulse difference signal can be switched and output There is an effect of obtaining an array antenna apparatus low sidelobe both Noparusu sum pattern and monopulse difference pattern.

According to the second embodiment of the present invention,
The power supply circuit is divided into two regions, a central portion and a peripheral portion, two monopulse comparators are connected independently to the peripheral portion and the central portion, and the monopulse comparator generates independent monopulse sum signals and monopulse difference signals, respectively. A switch for generating and outputting a monopulse sum pattern using the entire antenna by combining the two generated monopulse sum signals with equal amplitudes and equal phases in a hybrid, and for cutting off a monopulse difference signal caused only by the central portion. And connected to the hybrid via a mono-pulse difference signal by the peripheral part so that it can be synthesized and output with equal amplitude and equal phase.By controlling the switch, the mono-pulse difference signal only by the peripheral part and the mono-pulse difference signal using the whole antenna Monopulse sum pattern And there is an effect of obtaining an array antenna apparatus low sidelobe in monopulse difference pattern both.

According to the third embodiment of the present invention,
The power supply circuit is divided into two regions, a central portion and a peripheral portion, two monopulse comparators are connected independently to the peripheral portion and the central portion, and the monopulse comparator generates independent monopulse sum signals and monopulse difference signals, respectively. A monopulse sum pattern using the entire antenna is generated and output by combining the generated two monopulse sum signals with equal amplitudes and equal phases in a hybrid manner, and a monopulse difference signal only in the peripheral portion and a monopulse only in the central portion. Each of the difference signals is connected to the hybrid via the two dividers, synthesized and output with the same amplitude and the same phase as the monopulse difference signal by the central part, and the above signal and the signal obtained by distributing the monopulse difference signal only by the peripheral part by the two divider are divided. It is configured so that it can be switched by a switch, and by controlling the switch Since to be able to output by switching the monopulse difference signals using whole monopulse difference signals and the antenna by only the sides there is an effect of obtaining an array antenna apparatus low sidelobe both monopulse sum pattern and monopulse difference pattern.

According to the fourth embodiment of the present invention,
The power supply circuit is divided into two regions, a central portion and a peripheral portion, two monopulse comparators are connected independently to the peripheral portion and the central portion, and the monopulse comparator generates independent monopulse sum signals and monopulse difference signals, respectively. A monopulse sum pattern using the entire antenna is generated and output by synthesizing the generated two monopulse sum signals with equal amplitudes and equal phases using a hybrid. To connect one of the outputs of the splitter to the hybrid,
The other output is connected to a switch, and the monopulse difference signal only at the center is connected to a hybrid via an attenuator having the same attenuation as the distribution amount of the two-divider and a phase adjuster. The monopulse difference signal is synthesized and output with equal amplitude and the same phase, and the above signal and the signal obtained by distributing the monopulse difference signal of only the peripheral part by the two dividers can be switched by a switch. There is an effect that an array antenna device having a low side lobe can be obtained.

According to the fifth embodiment of the present invention,
The power supply circuit is divided into two regions, a central portion and a peripheral portion, two monopulse comparators are connected independently to the peripheral portion and the central portion, and the monopulse comparator generates independent monopulse sum signals and monopulse difference signals, respectively. By combining the two generated monopulse sum signals with equal amplitudes and equal phases by the two synthesizers, a monopulse sum pattern using the entire antenna is generated and output, and the monopulse difference signal caused only by the peripheral portion is independently obtained. One of the outputs of the switch is passed through a switch to take out 2
Connect to the combiner, connect the other to another switch, connect the monopulse difference signal from the center to the two combiners via the phase adjuster, and use the two combiners to equalize the two monopulse difference signals. Since the signals are combined and output at the same phase and connected to the other switch, there is an effect that an array antenna device having a low sidelobe in both the monopulse sum pattern and the monopulse difference pattern can be obtained.

According to the sixth embodiment of the present invention,
The power supply circuit is divided into two regions, a central portion and a peripheral portion, two monopulse comparators are connected independently to the peripheral portion and the central portion, and the monopulse comparator generates independent monopulse sum signals and monopulse difference signals, respectively. A monopulse sum pattern using the entire antenna is generated and output by synthesizing the generated two monopulse sum signals with equal amplitudes and equal phases using a hybrid. One of the outputs of the two dividers is connected to an unequal divider for compensating for the amplitude difference due to the path difference between the peripheral part and the center part, and the other is connected to a switch, and the monopulse difference is determined only by the center part. The signal is connected to the above unequal distributor via a phase adjuster, and the two unequal distributors combine and output two monopulse difference signals at the same phase. Since the above signal and the signal obtained by distributing the monopulse difference signal caused only by the peripheral portion by the two dividers can be switched by a switch, an effect is obtained that an array antenna device in which both the monopulse sum pattern and the monopulse difference pattern have low sidelobes can be obtained. There is.

According to the seventh embodiment of the present invention,
The power supply circuit is divided into two regions, a central portion and a peripheral portion, two monopulse comparators are connected independently to the peripheral portion and the central portion, and the monopulse comparator generates independent monopulse sum signals and monopulse difference signals, respectively. A monopulse sum pattern using the entire antenna is generated and output by synthesizing the generated two monopulse sum signals with equal amplitudes and equal phases using a hybrid. The main line is connected to the hybrid through the connection, the coupling line side is connected to the switch, and the monopulse difference signal only at the center is connected to the hybrid via the phase adjuster. And outputs the above signal and the monopulse difference signal only from the peripheral part Since a signal obtained by binding at tropism coupler and can be switched by the switch has the effect of obtaining an array antenna apparatus low sidelobe both monopulse sum pattern and monopulse difference pattern.

According to the eighth embodiment of the present invention,
To divide the power supply circuit into two regions, a central part and a peripheral part, connect the output of the peripheral power supply circuit to the two divider, and combine one output of the two divider with the output of the central part supply circuit 2
It is input to the distributor, combined with the output of the feed circuit at the center, and connected to a monopulse comparator for the entire antenna aperture to generate a monopulse sum signal and a monopulse difference signal when the antenna full aperture is used, and the other output Is connected to a monopulse comparator for the peripheral portion, a monopulse difference signal is generated by an antenna aperture only in the peripheral portion, and the two monopulse difference patterns can be switched and output by a switch for switching the two monopulse difference patterns. Therefore, there is an effect that it is possible to obtain an array antenna device having a low sidelobe in both the monopulse sum pattern and the monopulse difference pattern.

According to the ninth embodiment of the present invention,
Similar effects can be obtained in a phased array antenna having a phase shifter connected to each element antenna.

According to the tenth embodiment of the present invention, a similar effect can be obtained for a two-dimensional array antenna having a monopulse difference signal corresponding to an azimuth and an elevation.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an array antenna device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of division of a peripheral portion and a central portion of the array antenna device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing an aperture distribution of a monopulse sum pattern of the array antenna device according to the first embodiment of the present invention.

FIG. 4 is a diagram showing an aperture distribution of a monopulse difference pattern only at a peripheral portion of the array antenna device according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a radiation pattern only at a peripheral portion of the array antenna device according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a two-dimensional distribution of side lobes of a monopulse difference pattern only at the periphery of the array antenna device according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of an array antenna device according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of an array antenna device according to a third embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of an array antenna device according to a fourth embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of an array antenna device according to a fifth embodiment of the present invention.

FIG. 11 is a diagram showing a configuration of an array antenna device according to a sixth embodiment of the present invention.

FIG. 12 is a diagram showing a configuration of an array antenna device according to a seventh embodiment of the present invention.

FIG. 13 is a diagram showing a configuration of an array antenna device according to an eighth embodiment of the present invention.

FIG. 14 is a diagram showing a configuration of an array antenna device according to a ninth embodiment of the present invention.

FIG. 15 is a diagram showing a configuration of an array antenna device according to a tenth embodiment of the present invention.

FIG. 16 is a diagram showing division of an antenna aperture of an array antenna device according to a tenth embodiment of the present invention.

FIG. 17 is a diagram showing a configuration of a conventional array antenna device.

FIG. 18 is a diagram showing an aperture distribution of a monopulse sum pattern of a conventional array antenna device.

FIG. 19 is a diagram showing an aperture distribution of a monopulse difference pattern of a conventional array antenna device.

FIG. 20 is a diagram showing a radiation pattern by a conventional array antenna device.

FIG. 21 is a diagram showing a two-dimensional distribution of side lobes of a monopulse difference pattern by a conventional array antenna device.

[Explanation of symbols]

1 element antenna, 2 feeding circuit, 3 monopulse comparator, 4 hybrid, 5 switch, 6 terminator, 72 divider, 8 antenna aperture, 9 axis for detecting direction of target, 10 phase adjuster, 11 attenuator,
12 unequal distributor, 13 directional coupler, 14 phase shifter, 152 combiner.

──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Seiichi Kanegae 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (56) References JP-A-63-157506 (JP, A) JP-A-63 -157507 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01Q 25/02 H01Q 3/26 G01S 7/02 G01S 13/44

Claims (10)

(57) [Claims] A plurality of element antennas; a first power supply circuit for supplying power to the element antenna at a central portion of the antenna; a second power supply circuit for supplying power to the element antenna at a peripheral portion of the antenna; A first mono-pulse comparator connected to the power supply circuit, a second mono-pulse comparator connected to the second power supply circuit, and a mono-pulse sum signal generated by the first mono-pulse comparator is converted to the second mono-pulse comparator A first phase adjuster for making the phase equal to the monopulse sum signal generated by the first and second monopulse comparators, a first hybrid for synthesizing the two monopulse sum signals at the same amplitude and the same phase, and A first switch for outputting the generated monopulse difference signal, and a switch generated by the first monopulse comparator. The obtained monopulse difference signal is
A second phase adjuster for making the phase equal to the monopulse difference signal generated by the monopulse comparator, and one of the outputs of the first switch and the output of the second phase adjuster to have the same amplitude and the same phase. And a second switch for switching and outputting the other output of the first switch and the output of the second hybrid . Switch switch
The monopulse difference pattern and the circumference of the entire antenna aperture
Switching the monopulse difference pattern of the antenna aperture on the side
An array antenna device characterized in that the array antenna device outputs the data. 2. A plurality of element antennas, a first power supply circuit for supplying power to the element antenna at a central part of the antenna, a second power supply circuit for supplying power to the element antenna at a peripheral part of the antenna, and the first power supply circuit. A first mono-pulse comparator connected to the power supply circuit, a second mono-pulse comparator connected to the second power supply circuit, and a mono-pulse sum signal generated by the first mono-pulse comparator is converted to the second mono-pulse comparator A first phase adjuster for making the phase equal to the monopulse sum signal generated by the above, a first hybrid for synthesizing the two monopulse sum signals at the same amplitude and the same phase, and the first monopulse comparator A switch for interrupting the generated monopulse difference signal; and a switch for generating the monopulse difference signal. A second phase adjuster for making the no-pulse difference signal equal in phase to the monopulse difference signal generated by the second monopulse comparator; and a monophase difference signal generated by the second monopulse comparator and the second phase adjuster. a second hybrid for combining with equal amplitude such as phase the output of the phase adjuster, the switch
The mono-pulse difference pattern across the antenna aperture
The monopulse difference pattern between the antenna
An array antenna device characterized in that the output is switched . 3. A plurality of element antennas, a first power supply circuit for supplying power to the element antenna in a central part of the antenna, a second power supply circuit for supplying power to the element antenna in a peripheral part of the antenna, and the first power supply circuit. A first mono-pulse comparator connected to the power supply circuit, a second mono-pulse comparator connected to the second power supply circuit, and a mono-pulse sum signal generated by the first mono-pulse comparator is converted to the second mono-pulse comparator A first phase adjuster for making the phase equal to the monopulse sum signal generated by the first and second monopulse comparators, a first hybrid for synthesizing the two monopulse sum signals with the same amplitude and the same phase, and A first mono-divider for outputting the generated mono-pulse difference signal, and a mono-pulse difference signal generated by the first mono-pulse comparator. The obtained monopulse difference signal is
A second two-way divider for making the phase equal to the mono-pulse difference signal generated by the mono-pulse comparator, a second phase adjuster for making the phase equal, and one of the outputs of the first two-way divider. A second hybrid for synthesizing the output of the second phase adjuster with the same amplitude and the same phase;
A switch for switching and outputting the other output of the two dividers and the output of the second hybrid ,
By changing the above switch, the whole antenna aperture
Pulse difference pattern and monopulse at the peripheral antenna aperture
An array antenna device for switching and outputting a difference pattern . 4. A plurality of element antennas, a first power supply circuit for supplying power to the element antenna in a central part of the antenna, a second power supply circuit for supplying power to the element antenna in a peripheral part of the antenna, and the first power supply circuit. A first mono-pulse comparator connected to the power supply circuit, a second mono-pulse comparator connected to the second power supply circuit, and a mono-pulse sum signal generated by the first mono-pulse comparator is converted to the second mono-pulse comparator A first phase adjuster for making the phase equal to the monopulse sum signal generated by the first and second monopulse comparators, a first hybrid for synthesizing the two monopulse sum signals at the same amplitude and the same phase, and A two-way divider for outputting the generated monopulse difference signal, and a model generated by the first monopulse comparator. A second attenuator for making the no-pulse difference signal equal in amplitude to the monopulse difference signal generated by the second monopulse comparator;
And one of the outputs of the two dividers and the second
A second hybrid for synthesizing the output of the phase adjuster with the same amplitude and the same phase, and a switch for switching and outputting the other output of the two divider and the output of the second hybrid. Provided by switching the above switch
Monopulse difference pattern over the entire antenna aperture
Output by switching monopulse difference pattern of antenna aperture
An array antenna device comprising: 5. A plurality of element antennas, a first power supply circuit for supplying power to the element antenna in a central part of the antenna, a second power supply circuit for supplying power to the element antenna in a peripheral part of the antenna, and the first power supply circuit. A first mono-pulse comparator connected to the power supply circuit, a second mono-pulse comparator connected to the second power supply circuit, and a mono-pulse sum signal generated by the first mono-pulse comparator is converted to the second mono-pulse comparator A first phase adjuster for making the phase equal to the monopulse sum signal generated by the first and second monopulses, and a first two synthesizer for synthesizing the two monopulse sum signals at the same amplitude and the same phase. A first switch for outputting a monopulse difference signal generated by the comparator; and a first switch generated by the first monopulse comparator. A second phase adjuster for making the monopulse difference signal the same phase as the monopulse difference signal generated by the second monopulse comparator;
A second synthesizer for synthesizing one of the outputs of the second switch and the output of the second phase adjuster with equal amplitude and equal phase;
A second switch for selectively outputting the other output of the first switch and the output of the second combiner, and switching the first and second switches to provide an output.
The monopulse difference pattern over the antenna aperture and the
Switching and outputting the monopulse difference pattern of the tena opening
An array antenna device , characterized in that: 6. A plurality of element antennas, a first power supply circuit for supplying power to the element antenna in a central part of the antenna, a second power supply circuit for supplying power to the element antenna in a peripheral part of the antenna, and the first power supply circuit. A first mono-pulse comparator connected to the power supply circuit, a second mono-pulse comparator connected to the second power supply circuit, and a mono-pulse sum signal generated by the first mono-pulse comparator is converted to the second mono-pulse comparator A first phase adjuster for making the phase equal to the monopulse sum signal generated by the above, a hybrid for synthesizing the two monopulse sum signals at the same amplitude and the same phase, and the second monopulse comparator A two-way divider for outputting a monopulse difference signal, and a monopalm generated by the first monopulse comparator A second phase adjuster for making the phase difference signal equal in phase to the monopulse difference signal generated by the second monopulse comparator; one of the outputs of the two dividers and the output of the second phase adjuster An unequal distributor for synthesizing the signals with equal amplitude and equal phase, and a switch for switching and outputting the other output of the two divider and the output of the unequal divider, and switching the switch. To
Mono-pulse difference pattern of the whole antenna aperture and its peripheral part
Switch the monopulse difference pattern of the antenna aperture
An array antenna device characterized by applying force . 7. A plurality of element antennas, a first power supply circuit for supplying power to the element antenna in a central part of the antenna, a second power supply circuit for supplying power to the element antenna in a peripheral part of the antenna, and the first power supply circuit. A first mono-pulse comparator connected to the power supply circuit, a second mono-pulse comparator connected to the second power supply circuit, and a mono-pulse sum signal generated by the first mono-pulse comparator is converted to the second mono-pulse comparator A first phase adjuster for making the phase equal to the monopulse sum signal generated by the first and second monopulse comparators, a first hybrid for synthesizing the two monopulse sum signals at the same amplitude and the same phase, and A directional coupler that outputs the generated monopulse difference signal from the output of the coupled line, and the first monopulse comparator. A second phase adjuster for causing the generated monopulse difference signal to have the same phase as the monopulse difference signal generated by the second monopulse comparator; a main line output of the directional coupler; A second hybrid for synthesizing the output of the phase adjuster with the same amplitude and the same phase; and a switch for switching and outputting the coupling line output of the directional coupler and the output of the second hybrid. Is turned on by switching the above switch.
Tena opening the entire monopulse Sapa turn and the peripheral portion of the antenna
Output by switching the monopulse difference pattern
And an array antenna device. 8. A plurality of element antennas, first and second power supply circuits for supplying power to the element antenna at the center of the antenna, and third and fourth power supply circuits for supplying power to the element antennas at the periphery of the antenna. A first and second splitter for equally splitting the outputs of the third and fourth power supply circuits; and an output of one of the first and second splitters and a first splitter.
And fourth and fourth outputs that combine the output of the second feeder circuit
A second hybrid that combines the outputs of the third and fourth two-dividers, and a first hybrid that combines the other outputs of the first and second two-dividers. A switch for switching and outputting the monopulse difference signal generated by the first hybrid and the monopulse difference signal generated by the second hybrid, and by switching the switch, the entire antenna aperture
Monopulse difference pattern and peripheral antenna aperture
The pulse difference pattern is switched and output.
That array antenna apparatus. 9. The array antenna device according to claim 1, wherein a phase shifter is connected to each of the plurality of element antennas. 10. A plurality of switches and a plurality of switches for outputting a monopulse difference signal corresponding to an elevation angle and an azimuth angle outputted from the first and second monopulse comparators so that a two-dimensional azimuth can be detected. Hybrid and
Array antenna apparatus according to claim 1, further comprising a.