JP2516293Y2 - Array antenna device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention has a function of transmitting a signal of a desired frequency band and a desired polarization and reflecting a signal of another frequency band and another polarization, and a function of achieving stealth. The present invention relates to an array antenna device equipped with a radome.

[0002]

2. Description of the Related Art FIG. 8 is a structural view of a conventional array antenna apparatus. In the figure, 1 is a radome, 2 is a plurality of antenna elements, and 3 is a phase shifter, a band pass filter or the like. Modules 4 are power supply circuits.

Next, the operation will be described. In the conventional antenna device, the signal received by the plurality of antenna elements 2 after passing through the radome 1 is passed by the band-pass filter inserted in the module 3 so that only the signal in the desired frequency band is passed and the phase shifter is used. Are combined by the feeding circuit 4 via the to form an array antenna radiation pattern. Further, the radome 1 is formed of a material having a small electrical influence and a structure for suppressing power reflection, so that power loss of a received signal is reduced.

[0004]

Since the conventional array antenna apparatus is constructed as described above, not only a desired signal but also an unnecessary signal passes through the radome. Therefore, it is necessary to remove unnecessary signals from the signals received by the element antenna 2, and insert a bandpass filter in the module 3 to transmit only the signals in the desired frequency band to the feeding circuit 4. Need. In addition, the cost and volume of the module 3 are increased by inserting the band-pass filter into the module 3, which makes it difficult to reduce the cost and size of the array antenna device. Further, there is a problem that the radar cross section of the array antenna device is known to other radars from the unnecessary signal reflected by the antenna surface.

The present invention has been made in order to solve the above problems, and it is possible to obtain a signal other than a desired frequency band without inserting a bandpass filter in the module.
It is possible to remove the narrow band can be removed before receiving the signal other than the desired polarization at the antenna elements, also for the purpose of obtaining an array antenna device having the stealth capabilities of the antenna body There is.

[0006]

The array antenna device according to the present invention is one in which a plurality of frequency selective elements are inserted in a radome installed around the array antenna.

Further, a plurality of frequency selection elements and a plurality of elongated metal wires are arranged in parallel in a radome installed around the array antenna.

Further, the plane of the planar radome in which a plurality of frequency selective elements and a plurality of metallic wires are inserted is installed in a state of being inclined with respect to the array antenna surface, or the shape of the radome is approximated. It is installed in a hemispherical shape, a partially spherical shape, or a quadratic curve rotation shape.

In the array antenna device according to the present invention, a plurality of frequency selection elements inserted in the dielectric layer forming the radome have a resonance action with respect to a specific frequency.
The radome part is narrowed by exciting the antiresonance effect.
It acts as a bandpass filter or bandpass filter with band characteristics .

Further, the plurality of frequency selective elements are inserted.
By arranging a plurality of elongated metal wires in parallel in the dielectric layer of the radome at intervals of half a wavelength or less of a certain frequency, a signal of a desired frequency and a desired polarization is transmitted, and
Reflects signals with frequencies or other polarizations.

Furthermore, if the surface of the radome in which the plurality of frequency selective elements are inserted is installed so as to be inclined with respect to the array antenna surface, signals outside the desired frequency band can be reflected in a direction different from the incident direction, and This is a means by which the radar cross section of the array antenna device is unknown to the radar.

Further, when the radome in which the plurality of frequency selective elements are inserted is installed in an approximate hemispherical shape, a partial hemispherical shape, or a quadratic curve rotator shape, a signal outside a desired frequency band is incident in the incident direction. It can be reflected in a different direction from the above, and is a means by which the radar cross section of the array antenna device is not known to other radars.

[0013]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG.
2 and 4 are the same as those of the conventional device. 5
Is a planar radome having a frequency selection function, 6 is a plurality of frequency selective elements inserted in the radome 5, and 7 is a small module having a phase shifter in which a bandpass filter is omitted from the module 3.

2 (a) and 2 (b) are a sectional view and a front view of the plurality of frequency selective elements 6, respectively.
In the above, 8 is a dielectric substrate, 9 is a conductor plate having a periodic structure of a hole-type double ring, and 10 is a dielectric plate having a low dielectric constant. Further, in FIG. 2 (b), 9 is the same as in FIG.
Is exactly the same as.

In the array antenna device configured as described above, the plurality of frequency selective elements 6 attached to the radome 5 are equivalently represented by capacitance and inductance. When the plurality of frequency selective elements 6 have the shape shown in FIG. 2, due to the resonance action of each element, for example , 1.1 times or more and 0.9 times the used frequency as shown in FIG.
A frequency characteristic that attenuates a radio wave having a frequency equal to or less than twice the frequency by 20 dB or more is obtained, and the plurality of frequency selective elements 6 operate as a narrow band pass filter. Therefore, even if unwanted signals in other frequency bands are incident on the device along with signals in the desired frequency band, the resonance action of the plurality of frequency selective elements 6 reflects the unwanted signals that are about to pass through the radome 5. , To transmit only the signal in the desired frequency band,
The unnecessary signal does not reach the element antenna 2.

Example 2. In the first embodiment described above, the structure of the conductor plate 9 of the plurality of frequency selective elements 6 is a hole type double ring. However, in the present embodiment, the structure of the conductor plate 9 is reversed, as shown in FIGS. The patch type double ring shown in b) is used. At this time, the plurality of frequency selection elements 6 have the frequency characteristic shown in FIG. 5 by the action of anti-resonance, and operate as a band elimination filter. Therefore, removal of unnecessary signals in a specific frequency band can be expected.

Embodiment 3. FIG. 6 shows an embodiment of the array antenna device when a plurality of metallic wires are inserted in the radome 5. In FIG. 6, 2 and 4 to 7 are the same as those in the first embodiment. Reference numeral 11 is a plurality of elongated metallic lines arranged in parallel in the dielectric layer.

7 (a) and 7 (b) show a cross-sectional view and a front view of a plurality of metallic lines 11 arranged in the dielectric layer. Reference numeral 11 is a plurality of metallic lines arranged in parallel, and 12 is a dielectric layer.

In the array antenna device constructed as described above, the plurality of metallic wires 11 attached to the radome 5 are arranged at intervals of half a wavelength or less of a certain frequency. Therefore, the plurality of metallic lines 11 reflect a signal having a frequency equal to or lower than a certain frequency and having a polarized wave parallel to the metallic line 11, due to the blocking effect. Therefore, even if a signal of a desired polarization and another unwanted polarization signal are incident on this device, the blocking effect of the plurality of metallic lines 11 causes the unwanted polarization signal to pass through the radome 5. Reflected,
Since only the signal of the desired polarization is transmitted, the element antenna 2
Undesired polarized wave signals will not reach.

Example 4. FIG. 8 shows an embodiment of the array antenna device when the planar radome 5 is installed with an inclination of an angle θ with respect to the array antenna surface on which the element antenna 2 is arranged. In FIG. 8, reference numerals 2, 4 to 7 and 11 are the same as those in the third embodiment.

In the array antenna device constructed as described above, the radome 5 is installed so as to be inclined with respect to the array antenna surface. Therefore, even if a signal outside the desired frequency band or a signal from another radar having a polarization other than the desired polarization enters the array antenna device, the tilted radome causes the signal in a direction different from the incident direction. This prevents the radar cross section from being detected by another radar and the radar cross section of the array antenna device.

Embodiment 5. FIG. 9 shows an embodiment of the array antenna device in which the shape of the radome in which the plurality of frequency selective elements 6 and the plurality of metallic wires 11 are inserted is a partially spherical shape. In FIG. 9, reference numerals 2, 4, 6, 7 and 11 are the same as those in the fourth embodiment, and 13 is a partially spherical radome.

In the array antenna device configured as described above, the radome 13 is installed with a certain curvature. Therefore, even if a signal outside the desired frequency band or a signal from another radar having a polarization other than the desired polarization enters the array antenna device, the curved radome causes a different direction from the incident direction. This prevents the radar cross section of the array antenna device from being detected by another radar.

[0024]

Since the present invention is constructed as described above, it has the following effects.

As described above, according to the present invention, by mounting a plurality of frequency selective elements on the radome of the array antenna device, the radome itself has the function of a band pass filter, so that the filter is omitted on the module side,
Since the price and volume of the module are reduced, the array antenna device can be made inexpensive and compact.

By inserting a plurality of metallic wires into the radome, the polarized wave to be received by the antenna can be selected, and a high-performance frequency / polarized wave selection radome can be obtained.

Further, a flat radome in which a plurality of frequency selection elements and a plurality of metallic wires are inserted is installed with an inclination with respect to the antenna surface, or the radome is approximately hemispherical in shape. Alternatively, the partial spherical shape or the quadratic curve rotator shape has the effect of making the array antenna device body stealth.

[Brief description of drawings]

FIG. 1 is a sectional view of an array antenna device showing a first embodiment of the present invention.

FIG. 2 is a sectional view and a front view of a plurality of frequency selective elements showing the first embodiment of the present invention.

FIG. 3 is a frequency characteristic diagram of a plurality of frequency selective elements showing the first embodiment of the present invention.

FIG. 4 is a sectional view and a front view of a plurality of frequency selective elements showing a second embodiment of the present invention.

FIG. 5 is a frequency characteristic diagram of a plurality of frequency selective elements showing the second embodiment of the present invention.

FIG. 6 is a sectional view of an array antenna device showing a third embodiment of the present invention.

7A and 7B are a sectional view and a front view of a plurality of metallic lines showing a third embodiment of the present invention.

FIG. 8 is a sectional view of an array antenna device showing a fourth embodiment of the present invention.

FIG. 9 is a sectional view of an array antenna device showing a fifth embodiment of the present invention.

FIG. 10 is a sectional view showing a conventional array antenna device.

[Explanation of symbols]

 2 element antenna 4 feeding circuit 5 radome 6 plural frequency selective elements 7 module 11 plural metallic wires

Claims (4)

(57) [Scope of utility model registration request] 1. A plurality of element antennas arranged on a plane.
Na, array antenna consisting of the feeding circuit for performing distribution and synthesis of the antenna elements to the high-frequency signal, and an array antenna composed of a module consisting of the phase shifter or the like, and radome which is disposed around the upper SL array antenna in the device, the array antenna apparatus characterized by inserting the plurality of frequency selective elements you excite resonance effect or anti-resonance effect against the particular peripheral <br/> wavenumber in the dielectric layer constituting the radome. 2. In the dielectric layer constituting the radome,
Multiple slender shapes that transmit or reflect radio waves depending on the plane of polarization
Claim 1, characterized in that inserted in parallel metal lines have
The array antenna device described . 3. The radome surface is tilted with respect to the antenna surface.
The array antenna device according to claim 1, wherein the array antenna device is inclined . 4. The shape of the radome surface is approximately a hemisphere.
The array antenna device according to claim 1, wherein the array antenna device has a shape, a partially spherical shape, or a quadratic curve rotator shape .